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MANUAL - VEGA Americas, Inc.

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2. L1 c c ewm ox 2 OO ox os L1 L2 GND GND GND DC DC Freq Freq RY NO 485 485 5 5 Aux Figure 12 Interconnect Table 7 Terminal names and descriptions Description AC power input AC power input Earth ground connection Redundant earth ground connection Redundant earth ground connection DC power input used only in place of AC power DC power input used only in place of AC power Positive current loop output Negative current loop output Not used in HART applications Not used in HART applications Relay normally open Relay common Relay normally closed Serial 485 common not used for normal operation Serial 485 not used for normal operation Serial 485 not used for normal operation Auxiliary input power common used only with aux input circuit board Auxiliary input power used only with aux input circuit board Auxiliary input power used only with aux input circuit board Auxiliary input frequency signal Auxiliary input frequency signal Required for AC powered HART applications Required for DC powered HART applications Continuous Level with HART Technical Reference Manual Installation Power CAUTION DO NOT APPLY POWER until a thorough check of all the wiring is c
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4. TERMINAL STRIP CLOSEST TO CIRCUIT BOARD RELAY SEE NOTE 6 HOUSING GROUND SEE NOTE 7 FREQUENCY INPUT FROM DETECTOR SEE NOTE 8 Level detector providing frequency signal to Remote HART Unit Figure 42 Remote HART Processor interconnect Software settings required The Remote HART Processor requires two Advanced Functions parameters to be set from the Advanced Fxns menu e Select gage type Level e Select gage locati Remote Setting the gauge location to Remote makes the auxiliary input from the level detector the primary channel for calibration Continuous Level with HART Technical Reference Manual 151 Appendix Retrofitting HART electronics Calibrating with the Remote HART Processor As long as the gauge location in Advanced Functions is set to Remote the level gauge can operate and calibrate as described in this manual If your system was using an Ohmart Smart Pro or Smart Pro Pac and was functioning well you can save time by transferring the calibration data from the Pro to the HART electronics See the Preserving Information from Smart Pro section in this manual 152 Continuous Level with HART Technical Reference Manual Appendix IV HART menus and screens The following charts illustrate the HART hand held communicator menus and screens See the Ohmart View User Manual for illustrations of the Ohmart View
5. M N Figure 61 New hardware Continuous Level with HART Technical Reference Manual 170 HART menus screens Appendix IV 359 541 1591 duie 1x3 Z ONZ S A 3593 3IX9 141 1591 xne Z ONT SOA sjunod ysn py sjunoo SIAL dooj eSueuo xa 459 Kejo13ix3 eyep Mau 3415 2 59 Mau puas 2181 Z juaun 7 1591 duia 19103 1591 G 3591 p xne mau SAL sjunod ysn py sjunoo xny 1591 xny 3594 xny 159 3IX9 941 459 Z 5 snfpy sjunoo eyep Mau 3435 Sjunoo Meu 1nd S9A 5 sjunoo Mey 1591 49 U 1591 105095 Z 5 359
6. Figure 55 Current loop Cal Continuous Level with HART Technical Reference Manual 164 Appendix IV HART menus screens ON Ayeaul 59 v anea 19003 SYUNOD 13447 dE 191u3 SJUNOD Mau 31313A julodejeq 1 39 mou 421 ajqeL 9 sydeyep 00 0 55 2044 1 p l y 2 HHH HEY 129107 NPA 3ndu 129 02 Z 00 001 01 0 G z gueds 11p3 S A Z ueds gt ae LHHHH zuad 495 junoo 3 junoo jezueaur Jezueoun Jazueauly 329195 adh Ul 91 9S Jezueaur Figure 56 Linearizer 165 Continuous Level with HART Technical
7. 5 s Technical Reference MANUAL CONTINUOUS LEVEL MODELS LSTH LJTH LNTH WITH HART COMMUNICATIONS PROTOCOL Revision history Table 1 Revision history Version Description Date 1 0 Initial release Formerly 237473 051201 Copyright 1996 2005 Ohmart VEGA Corporation Cincinnati Ohio All rights reserved This document contains proprietary information of Ohmart Corporation It shall not be reproduced in whole or in part in any form without the expressed written permission of Ohmart VEGA Corporation The material in this document is provided for informational purposes and is subject to change without notice HART is a registered trademark of The HART Communication Foundation ISO 9001 approval by Lloyd s Register Quality Assurance Limited to the following Quality Management System Standards ISO 9001 1994 ANSI ASQC Q9001 1994 Approval Certificate No 107563 Ohmart VEGA Corporation 4241 Allendorf Drive Cincinnati Ohio 45209 1599 USA Voice 513 272 0131 FAX 513 272 0133 Web site www ohmartvega com Field service email fieldservice ohmartvega com WARNING Use this equipment only in the manner that this manual describes If you do not use the equipment per Ohmart VEGA specifications the unit is not CE compliant and may be damaged or cause personal injury ii Continuous Level with HART Technical Reference Manual
8. Notes viii Continuous Level with HART Technical Reference Manual Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Preface HART screen gauge not connected xvi HART screen gauge connected xvii System overview 11 Typical source holder 12 LSTH exploded view 13 LJTH and LNTH exploded view 14 LJTH electronics assembly 15 HART connections 16 Figure 9 Ohmart View software 18 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 Figure 35 Figure 36 Online menu 19 Bench test setup 20 Interconnect 24 Measuring the current loop output 31 Standard method calibration flow chart 34 Simple method calibration flow chart 36 Linearizer data collected at various process levels 38 Raw counts vs actual level with linearizers 39 Count range vs span shown in linearizer table 40 Indicated level vs actual level 40 counts range vs process span 54 X ray interference alarm output 76 CPU board simplified component layout 78 LED indicators 79 Power intraconnect diagram for LSTH 81 Intraconnect for LNTH and LJTH 82 HART Communication flowchart 83 Transmitter not responding flowchart part 1 84 Transmitter n
9. Keq INOS ules 9 ules dwop 9491 gt xny urey 9 9 UIW t HEHE HHH ysiy uno HEHEHE 5592044 Z 963 TETETE HHH 2 9 S4 434 duo HEEE 0005 6 1 5 8 SUO 2 15 Z sjunod 059 sjunoo sjunoo y 25 5102 105095 Z D S P 1 jauueys 9204 Figure 59 Process chain Continuous Level with HART Technical Reference Manual 168 Appendix IV HART menus screens gt gt gt WoW GM E Eo Seecws ce ss st ov E Exot HAL 0m shi Figure 60 Min max history Continuous Level with HART Technical Reference Manual 169 Appendix IV HART menus screens ON L c L 0 NOK pa e1sui 10595 Mau payjeysul Mau ON 105 5 MAN Z M N L
10. 2 Models with DF amplifiers are 0 10 2 output for use with Smart Series electronics See the following table for kit part numbers Table 34 LJ to LJTH conversion kit part numbers LJ to LJTH conversion kit part numbers FA amplifier DF amplifier 115V 238238 237925 230V 238239 238236 The kits contains the following parts Assembly drawings e Electronics assembly HART CPU board power supply CTC temperature controller and interconnect terminal all fixed on a mounting plate e Electronics housing end cap e DF amplifier if the existing detector has a FA amplifier e Continuous Level User Manual Continuous Level with HART Technical Reference Manual 147 Appendix Retrofitting HART electronics Upgrading hardware to HART electronics Specific instructions for upgrading your existing detector to HART are available on the drawing sent with the kit General guidelines follow Installing and wiring the new HART electronics assembly Procedure 55 Calibrating with vapor compensation 1 Always turn the source holder shutter to the OFF or CLOSED position when working near the gauge 2 Remove the DPC power supply temperature controller from the detector 3 Remove the amplifier cover plate 4 If you are upgrading an FA model install the DF amplifier included with the kit Verify the high meg feedback resistor on the new DF is the same value as the resistor on the FA Or remove the feedback resistor on the FA and in
11. 83 Diagnostics and repair Transmitter not responding flowchart The transmitter is not responsive HART communication is OK START M Power distribution checks Remove pipe cap Is power pet am 4 n input terminal strip eck power source o to m from praed E AC at term 1 2 3 and interconnect wiring E Tee a PEUN Y DC at term 3 6 7 No lights OFF If wiring OK sensor is shorting out power Replace sensor No Yes Yes Go to G F Are Is transmitter 5V 30V and 5V Remove CN2 15 pin on CPU board testpoints connector from CPU Do LED s AC or DC board to i gt 5V IsoG 15030 1500 oard to isolate power go on DC 5V IsoG No from sensor Yes No gt Check wiring at CPU board Check wiring between CPU LED bank bad CN2 T1 5v T2 5V DC distribution bad board CN3 and power supply Replace If wiring OK sensor is Replace board TB2 and TB1 Refer CPU board shorting out power CPU board to power diagram Replace sensor Yes Is 24VDC Remove CN2 15 pin Is 24VDC present between connector from CPU present between power supply board board to isolate power power supply board TB2 pins 1 amp 4 No from sensor TB2 pins 1 amp 4 Yes No Go to F DC power bad Replace power supply board Figure 27 Transmitter not responding flowchart part 1 84 Continuous Level with HART Technical Reference Manual Diagnostics and repair Analog alarm checks S Analog alarm is set analog
12. Jumper selectable source active or sink passive mode Diagnostic alarm or process high low alarm function at 240VAC or at 24VDC SPDT Form C BEL202 FSK standard HART modem and Ohmart communications software package HART Communicator model 275 hand held terminal with Ohmart device descriptions loaded Not used for normal operation Frequency input 0 100 2 Analog input Optional temperature compensation multiple gauge linking and others FLASH and two EEPROMs Maintains time date and source decay compensation Year 2000 compatible 5V Memory Corruption HART 30V CPU Active Auxiliary High Voltage Relay amp Field Strength Power specifications change to 115 VAC or 230 VAC if an internal heater kit is used For more information see page 142 Continuous Level with HART Technical Reference Manual 5 Introduction LJTH specifications System Accuracy Active Lengths Typical Sources Power Requirements Signal Cable Housing Current Loop Output Relay Output HART Communication Serial Communication Auxiliary Input Capability Electronics Diagnostics Table 4 specifications 1 of span typical Model LUTH Cesium 137 Cobalt 60 AC Wire size Maximum length HART signal CSA Certification CENELEC Certification Temperature Humidity Vibration Material Paint Detector Weight Rating Power source Software user settable Rating HART Protoc
13. 5920 44 np yoayo edK uO HO adky uue v 02405 do onsou8eiq adim e unos uO JO anp azipsepurys 4O HO Josuas yoo eas 1dnuoo HSW14 HO 05 WO1Id33 105095 uO HO 4dn1109 WV do isouS8eiq 1 5599044 onsuSeiq ux Ala Jes qul yas Aejas 5592014 Mans NO WEY vul zz uue e onsouS8elq uoneanSiyuoo epow c suue v Figure 48 Alarms 159 Continuous Level with HART Technical Reference Manual Appendix IV HART menus screens H c joy v 3 9J o2 2 jay 3 9J o2 2 HERE UED JOA 5 ON WYON HO JodeA ON Z 1 SES DL 1
14. Continuous Level with HART Technical Reference Manual 111 Appendix Initial factory setup Setting up the process alarm Procedure 46 Setting up the process alarm 1 From the Main menu select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu choose Set relay function 4 From Set relay function menu select Process and press F4 to enter 5 Press the LEFT ARROW key to return to the Alarms menu 6 From the Alarms menu select Mode configuration 7 From the Mode configuration menu select Process relay set 8 From the Process relay set menu select Relay action 9 From the Relay action screen select either High limit or Low limit 10 From the Process relay set menu select Relay setpoint 11 From the Relay setpoint screen enter the numeric value of the alarm setpoint in process units and press F4 to enter when finished entering the value 12 If using a hand held HART communicator press F2 to send the setting to the transmitter 112 Continuous Level with HART Technical Reference Manual Appendix Initial factory setup X ray alarm setup The x ray alarm compensates for false indicated process values that occur when external radiographic sources the gauge detects Vessel weld inspections often use portable radiographic sources Detection of x rays by the gauge causes a false low reading and adversely affects any control based on the gauge output The x ray alarm distinctly changes t
15. Jumper selectable source active or sink passive mode Diagnostic alarm or process high or low alarm 8A at 250VAC SPDT Form C BEL202 FSK standard HART modem and Ohmart communications software package HART Communicator model 275 hand held terminal with Ohmart device descriptions loaded Not used for normal operation Frequency input 0 100kHz FLASH and two EEPROMs Maintains time date and source decay compensation Year 2000 compatible 5V Memory Corruption HART 30V CPU Active Auxiliary High Voltage Relay amp Field Strength Power specifications change if an internal heater kit is used See page 142 150 Continuous Level with HART Technical Reference Manual Appendix Retrofitting HART electronics Remote HART Processor installation The Remote HART Processor can be mounted anywhere meeting its certification specifications and within 1 000 m 3 280 ft of the level detector Remote HART Unit viewed with cap off HART communication equipment and DCS SHIELD DO NOT USE THIS END CONNECT TO EARTH GROUND AT ELECTRONICS END OPTIONAL 5 amp OUTPUT SIGNAL CABLE A NOTES 2 3 amp 9 OPTIONAL HAND HELD TERMINAL DCS SEE NOTE 4 9 p POWER CABLE PER LOCAL CODES AC POWER 1 EARTH GROUND 8
16. and Linearizer data point 1 Linearizer data point 2 Linearizer data point 3 Linearizer data point 4 Linearizer data point 5 Linearizer data point 6 Linearizer data point 7 Linearizer data point 8 Linearizer data point 9 Cal high level usually full and Linearizer data point 10 Continuous Level with HART Technical Reference Manual 44 Calibration Step 1 Set low level Setting the low level for calibration requires the following activities e Measurement with the level transmitter of the low process level e Entry of the actual level This sets the low end sometimes referred to in the U S as zero of the calibration curve Perform this procedure either before or after setting the high level Note You must perform data collection for the low and high level within ten days of each other for a good calibration The low and high values must be more than 10 percent of the process span apart for the most accurate calibration Increasing the process span usually increases the gauge accuracy Before starting the cal low data collection Fill vessel to its low level Have actual level value ready to enter Setting the cal low level Procedure 4 Setting the cal low density 1 From the Main menu select Calibrations 2 From the Calibrations menu select Initial cal 3 From the Initial cal menu select Two point cal 4 From the Two point cal menu select Set Cal low level 5 prompt
17. 0 66MeV gamma radiation emitter 30 2 year half life 1 2 and 1 3MeV gamma radiation emitter 5 3 year half life 115 or 230VAC 10 at 50 60Hz at 525VA max power consumption CE compliance requires 24VDC 14 22AWG 1 63 0 643 3 280ft 1 000 m 18 22 AWG 1 02 0 643 two conductor shielded Designed to meet National Electric Code U S amp Canada Class Groups A B C amp D Division 1 amp 2 Class Groups E F amp Division 1 amp 2 EExd 1 T5 IP 66 4 1409 20 602 option for lower temperatures available water cooling required above 140 F 60 C 0 95 non condensing 0 5g at 300cps Carbon Steel others optional Epoxy Powder Coat 60lb 1 836 active length in inches 27 kg 0 0371kg active length in mm 1001 2 086 active length in inches 45kg 0 037kg active length in mm 4 20mA isolated into 250 1 000 Jumper selectable source active or sink passive mode Diagnostic alarm or process high low alarm function 10A at 240VAC or at 24VDC SPDT Form C BEL202 FSK standard HART modem and Ohmart communications software package HART Communicator model 275 hand held terminal with Ohmart device descriptions loaded Not used for normal operation Frequency input 0 100kHz Analog input Optional temperature compensation multiple gauge linking and others FLASH and two EEPROMs Maintains time date and source decay compensation Year 2000 compatibl
18. 106 time and date failure after extended power down 106 re set if extended power down 21 76 178 Continuous Level with HART Technical Reference Manual U Uniformity gain 55 units 98 upgrade to HART 149 vapor compensation calibrating 142 setting up 141 version numbers 68 vessel agitators effect 22 View settings screen 32 W warm up time LJTH and LNTH 30 31 Wipe interval 107 x ray alarm 72 77 setting parameters 116 setting relay as 117 ui m zero counts 77 31443 US 051201 OHMAR SESE VEGH 4170 Rosslyn Drive Cincinnati Ohio 45209 USA telephone 1 513 272 0131 fax 1 513 272 0133 web www ohmartvega com e mail info ohmartvega com 31443 US 051201
19. 541 1591 ueuno ysnipy jueuno 3ndino ONZ S A eyep 325 EN uano yndjno Mau 3ndu ueuno ysnipy 34 44 1591 1343 1591 159 Figure 62 Test mode 171 Continuous Level with HART Technical Reference Manual Appendix IV HART menus screens Elt pODTLE HEHEHE 1900 THEE 1209 01 5 90 Sjo02 mai 2 VV VVVVV ON 1225 105 95 9 VV EVVVVV ON 5 Y 33 4 4pP 10d Z 10595 42430 Figure 63 Other advanced Continuous Level with HART Technical Reference Manual 172 Appendix IV HART menus screens Ausuaq 19497 ad 8 8 129195 8 jenuew 3e3 sasueyp 4 ases SulsueyD 2 adh 9828 129 95 Figure 64 Select gage type ajoway 2201 uoneoo 2828 19195 8 225 8 8 sasuey
20. 77 power source or sink mode 81 span 105 current loop output test mode 61 custom units 98 Customer Order Number 10 required for repairs 95 Cycle period 115 alarm setup 116 22 0 Damping 102 Data collect 43 Data collection interval 99 using data collect on sample to check interval 43 Date 106 Default standardize level 100 Descriptor user defined in System information 109 device description 18 DF amplifier 15 diagnostic alarm acknowledging 74 messages 74 resetting relay 74 setting relay as 112 Diagnostic alarm 71 diagnostic history 79 Dither level 115 alarm setup 116 Dither time 116 alarm setup 116 drawings 122 130 EEPROM corruption repair 60 Continuous Level with HART Technical Reference Manual 175 Index E Fast response cutoff 102 Field service See Ohmart Customer Service filtering 101 damping 102 fast response cutoff 102 of auxiliary input 118 RC 101 rectangular window 102 Firmware version 68 Flash corrupt alarm setup 111 FLASH corrupt in diagnostic history 79 FLASH corrupt LED pattern 81 hand held terminal 17 Hardware version 68 HART 17 HART Communicator 17 HART load resistance 17 heated ion chamber 15 High voltage displayed in process chain 56 History information 79 H LJTH 15 H LNTH 15 hot spot key 53 initial calibration 34 new required 51 theory of 39 input filter 118 uj jumpers 81 Level instead
21. Appendix 11 Special applications Internal heater kit for applications below 50 A heater kit option is available for the LSTH LJTH and LNTH for applications that require a 50 58 F temperature rating With the heater option the internal temperature of the unit rises approximately 30 86 F degrees The features of the heater are as follows heater kit does not affect the functionality of the level detector in any way There is no requirement for special firmware factory installs the internal heater kit if you order it with the level detector Retrofits are available for previously installed equipment e Two different kits are available one for 115VAC and one for 220VAC The part numbers are shown below Table 31 Internal heater part numbers Heater kit power Ohmart Part Number 115 VAC 239964 220 VAC 239965 Changes to specifications If you install the heater kit the power rating changes from the specifications on pages 5 7 of this manual LSTH or LSF With the installation of the heater the maximum power consumption increases to 30 watts The unit is either 115VAC 10 or 220VAC 10 instead of the standard 90 270 range LJTH LJF LNTH or LNF With the installation of the heater the maximum power consumption increases by 15W 142 Continuous Level with HART Technical Reference Manual Appendix Retrofitting HART electronics to existing equipment This appe
22. Calibrating with the Remote HART Processor 152 Continuous Level with HART Technical Reference Manual Notes vi Continuous Level with HART Technical Reference Manual Tables Table 1 Revision history steer eee eden ii Table 2 Explanation of xiii Table 3 LSTH specifications 5 Table 4 LJTH 5 6 Table 5 LNTH specifications 7 Table 6 Contact information 2 e 9 Table 7 Terminal names and 24 Table 8 Calibration 33 Table 9 Standard method 35 Table 10 Simple method calibration 37 Table 11 Standard calibration sensor counts and levels 44 Table 12 Alarm type outputs 71 Table 13 Diagnostic alarm conditions 74 Table 14 Test point labels and descriptions 78 Table 15 Jumper 06 79 Table 16 LED summary table 80 Table 17 Periodic maintenance 86 Table 18
23. Contents Explanation of symbols xiii HART software screens xv User s comments xviii CHAPTER 1 INTRODUCTION 1 Nuclear materials notice 1 Unpacking the equipment 2 Storing the equipment 3 LSTH specifications 4 LJTH specifications 6 LNTH specifications 7 Typical applications 8 Where to find help 9 Ohmart Customer Service 9 Scintillator model LSTH 13 lon chamber models LJTH and LNTH 14 Communicating with the gauge 16 Using a universal hand held terminal 16 Using Ohmart View Software on a PC 17 The HART screens menu structure 19 CHAPTER 2 INSTALLATION 20 Testing on the bench 20 Location considerations 21 Mounting the measuring assembly 23 Wiring the equipment 23 Power 25 Switch for CE compliance 25 Output current loop 25 Communication 25 Process alarm override switch 26 Conduit 26 Commissioning the gauge 27 Can you remove the source holder lock 27 Field service commissioning call checklist 29 CHAPTER 3 CALIBRATION 30 Current loop analog output calibration 31 Initial process calibration 33 Choosing the initial calibration method 33 Standard method of initial calibration 34 Simple method of initial calibration 36 Theory of initial calibration 38 Choosing the linearizer type 41 Non linear table 41 Table linear 41 Checking the gauge repeatability 42 Initial calibration 43 When a new initial calibration may be necessary 50 Periodic process standardization 50 Automatic standardization reminder 50 Performing a stand
24. Most significantly Ohmart View software writes entries immediately to the level transmitter but a communicator only sends changes after pressing F2 to send This manual s instructions are for the hand held communicator but most procedures use exactly the same steps Refer to the Ohmart View User Manual that accompanies the software diskette for complete instructions for using Ohmart View software 18 Continuous Level with HART Technical Reference Manual Introduction The HART screens menu structure In both the hand held HART Communicator and the Ohmart View software the user interface for HART functions is in a menu structure When the HART Communicator or Ohmart View starts up the Online menu displays 5 wn 5 5 E 5 8 5 9 9 ec SS a 60 gt gt 5 S lt m 2 p 97 5 8 lt 5 9 o gt 5 5 N 2 d 2 5 2 8 3k 10 For detailed list of HART screen sub menus see Appendix of this manual Continuous Level with HART Technical Reference Manual 19 Chapter 2 Installation Testing on the bench To ensure a quick start up after installation you can test the detector assembly with the HART compatible communication device
25. Power Requirements Signal Cable Housing Current Loop Output Relay Output HART Communication Serial Communication Input from Detector Electronics Diagnostics AC DC Wire size Maximum length for both detector signal and HART signal Cable type for both detector signal and HART signal Cable type 4 Wire hookup with DC Pending CSA amp FM Certification CENELEC Certification Temperature Humidity Vibration Material Weight Paint Rating Power Software user settable function Rating HART Protocol on current loop output PC interface Optional hand held interface Full duplex RS 422 485 port 2 400 baud Type On board memory Real time clock LED indication 90 270 at 50 60 2 at 20VA maximum power consumption 10 30 VDC less than 100mV 1 1 000 2 ripple at 10VA 14 22AWG 1 63 to 0 643mm 3 280ft 1 000 m 18 22 AWG 1 02 0 643 two conductor shielded 18 22 AWG 1 02 0 643mm four conductor shielded Designed to meet National Electric Code U S amp Canada Class Groups A B C amp D Division 1 amp 2 Class Groups E F amp Division 1 amp 2 EExd T5 IP 66 4 F 140 F 20 C 60 option for lower temperatures available water cooling required above 140 F 60 0 95 non condensing 0 5g at 300cps Carbon Steel others optional 42 Ib 19kg Epoxy Powder Coat 4 20mA isolated into 250 1 0000hm
26. SEE NOTE 8 OPTIONAL MODEM LJTH LNTH OR LSTH SEE NOTE 5 mA INPUT DCS GROUND NEUTRAL 2 2 HOT HOUSING GROUND ZZ ONAL CENELEC SEE NOTE 8 TERMINAL P d e S D 0 A WHT VA lt lt 9 Figure 35 Interconnect LNF or LSF with LJTH LNTH or LSTH 126 Continuous Level with HART Technical Reference Manual Appendix Il Special applications Initial settings and calibration requirements Refer to these sections of this manual for more details Table 30 Initial setting and calibration locations Setting Manual heading Page Select Summation mode in Initial setup Setting up summation mode 127 Set span for total of all detectors Span settings 101 Calibrate according to guidelines in calibration Initial process calibration 33 chapter Setting up summation mode Procedure 50 Setting up summation mode 1 From the Main menu select Initial setup 2 From the Initial setup menu select Auxiliary input 3 From the Auxiliary input menu select Compensation The compensation screen displays the current type of auxiliary input 4 From the Compensation menu select Type 6 From the Type menu select Summation T Press F4 to enter 8 If using a hand held HART communicator press F2 to send the settings to the t
27. Set process to desired value Take data displays Select Yes to enable the data collection to take place The on screen counter displays the time left If necessary press F3 to discontinue data collection 6 After collection of the data the screen prompts you to input the actual value Input the actual value in engineering units 7 If using a hand held Communicator press F2 to send the calibration setting to the level gauge Continuous Level with HART Technical Reference Manual 45 Calibration Step 2 Set high level Setting the high level for calibration requires the following activities e Measurement with the level transmitter of the high process condition e Entry of the actual level This sets the gain of the calibration curve Perform this procedure either before or after setting the low level Note You must perform data collection for the low and high level within ten days of each other for a good calibration The low and high values must be more than 10 percent of the process span apart for the most accurate calibration Increasing the process span usually increases the gauge accuracy Before starting the cal high data collection Fill vessel or pipe with high process or close the source holder shutter to simulate high process Have actual level ready to enter Setting the cal high level Procedure 5 Setting the cal high level 1 From the Main menu select Calibrations 2 From th
28. span Smart Pro Value 100 0 528 0 0 0 1 528 1 2 5 2 528 2 5 0 3 528 3 7 5 4 528 4 10 0 5 528 5 12 5 6 528 6 15 0 7 528 7 17 5 8 528 8 20 0 9 528 9 22 5 10 528 10 25 0 11 528 11 27 5 12 528 12 30 0 13 528 13 32 5 14 528 14 35 0 15 528 15 37 5 16 528 16 40 0 17 528 17 42 5 18 528 18 45 0 19 528 19 47 5 20 528 20 50 0 21 528 21 52 5 22 528 22 55 0 23 528 23 57 5 24 528 24 60 0 25 528 25 62 5 26 528 26 65 0 27 528 27 67 5 28 528 28 70 0 29 528 29 72 5 Continuous Level with HART Technical Reference Manual 145 Appendix III Retrofitting HART electronics Linearize r table points 30 31 32 33 34 35 36 37 38 39 40 146 Smart Pro Screen item Smart Pro Value table point Smart Pro Value 100 528 30 528 31 528 32 528 33 528 34 528 35 528 36 528 37 528 38 528 39 528 40 Table 33 Linearizer record continued HART Linearizer HART Linearizer table 75 0 77 5 80 0 82 5 85 0 87 5 90 0 92 5 95 0 97 5 100 0 Continuous Level with HART Technical Reference Manual Appendix Retrofitting HART electronics Integral retrofit The integral retrofit is possible for LJ models with either a DF or FA model amplifier The ion chamber HART upgrade kit is available from Ohmart Four kits are available depending on the model and voltage of the ion chamber The two model types are 1 Models with FA amplifiers are 0 10 analog output for use with the EDS series electronics
29. 63 1 1 1 Time t 1 Time Constant Figure 29 RC exponential filtering Continuous Level with HART Technical Reference Manual 99 Appendix Initial factory setup Rectangular window filtering Rectangular window filtering computes an average based only on a specified finite number of samples All samples are weighted equally in the average Although it provides a slower step response since the most recent measurements are weighted the same as those further back in time it produces a less noisy signal Generally rectangular window linear averaging by itself produces results similar to combining RC exponential filtering with the fast cutoff feature Sample Weighting Current Sample Figure 30 Rectangular window filtering Damping The type of filter you choose determines the damping function With the RC exponential method the damping entry is equivalent to a time constant that is the amount of time in seconds that it takes for the gauge reading to achieve 63 2 of a step change in process A range of integer values from 1 600 seconds is possible for this time constant entry With the rectangular window filtering the damping entry determines how many samples to use when calculating the average responding to 100 of a process step change The maximum damping entry is 100 with this type of filtering Fast response cutoff Fast response cutoff temporarily bypasses the RC or digital fil
30. LSTH spare parts number 88 Table 19 DTH spare part numbers 88 Table 20 LNTH spare part numbers 89 Table 21 Setting process values of 0 and 100 103 Table 22 Diagnostic alarm 109 Table 23 Analog alarm conditions 111 Table 24 Process relay set alarm 111 Table 25 X ray alarm 114 Table 26 LSF spare parts 121 Table 27 LIF spare 121 Table 28 LNF spare parts 121 Table 29 Typical combinations for detector wiring 123 Table 30 Initial setting and calibration locations 127 Table 31 Internal heater part numbers 142 Table 32 Smart Pro data 144 Table 33 Linearizer record sss 145 Table 34 LJ to LUTH conversion kit part numbers 147 Table 35 Remote HART Processor RHP specifications 150 Continuous Level with HART Technical Reference Manual Preface vii
31. Refer to page 97 for further information Continuous Level with HART Technical Reference Manual 42 Calibration Performing a data collect Procedure 3 Performing a data collect 1 From the Main menu select Calibrations 2 From the Calibrations menu select Data collect 3 At the prompt select Yes to enable the data collection to take place The on screen counter displays the time left Press F3 to abort if necessary to discontinue data collect 4 After data collection the screen displays the number of counts cnts output by the sensor Make note of the counts value 5 Repeat as often as necessary if checking repeatability Initial calibration The standard calibration method involves five main steps 1 Setting the low level and collecting Cal low data Setting the high level and collecting Cal high data Collecting linearizer data Calculating the linearizer 2E E Calculating the calibration Perform these data collection steps in any sequence Your ability to empty and fill the vessel determines the best sequence The simple calibration method skips Step 3 and 4 If using the standard calibration method you may find it helpful to record the sensor counts and levels at each step on Table 11 Continuous Level with HART Technical Reference Manual 43 Calibration Table 11 Standard calibration sensor counts and levels record Data type Sensor counts Actual level eng units Cal low level usually empty
32. Reference Manual HART menus and screens Appendix IV AA QQ WW AA GG WW AA QQ WW AA GG WW AA QG WW AA QQ WW AA QG WW AA QQ WW AA GG WW AA QQ WW AA QQ WW AA GQG WW AA QQ WW AA GG WW AA QQ WW 15 AA QQ WW AA GQG WW AA QQ WW AA GQG WW AA GG WW AA QQ WW AA GG WW AA QQ WW AA GG WW AA QQ WW AA QQ WW AA QG WW AA QQ WW AA GQG WW AA QQ WW 15 dads jo 1no 10595 eSue1 JO 1 0 ssa oJd ire 10suas 1e3nus z adh adk gt adim jrej 10595 eos 1dnuoo HSV14 341 102 WOld33 10 4 5 jdnuoo WYY 0351 onsouSelq THEE 510 09 AA QG WWM 10391 zpis Ssed ON ssed ON ON Ssed Ssed Ssed ON ON Ssed ssed Ssed 5584 ssed snjejs 10595 BUL jo 1 0 55 2 Snjejs Josuag anp 2992 z adh uue v 511815 WO3d33 anp adim aounos amp eziprepuejs 1591 240 9 105495 1591 euin ee snjejs HSV 14 51335 433 10595 snyejs WVU 10351 t soljsouseiq jno z8ue eq z
33. The filter dampening value is the number to enter for the auxiliary input filter time constant Min Max history The min max history displays the minimum and maximum value for parameters since the last min max reset The display values are Temp min max Temperature minimum and maximum displays the internal temperature of the scintillator sensor in the LSTH model level transmitter This does not apply to ion chamber detectors models LNTH and LJTH Sensor min max The sensor minimum and maximum field displays raw uncompensated counts from the detector Aux in min max Auxiliary minimum and maximum displays auxiliary input if used counts Last reset Displays the date of the last min max reset Continuous Level with HART Technical Reference Manual Advanced functions Resetting the minimum and maximum history You can reset the minimum and maximum history values so that they record from the time of the reset To reset the minimum and maximum history Procedure 10 Resetting the minimum and maximum history 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu select Min max history 3 From the Min max history screen select Reset min max 4 When prompted select Yes to reset the min max values Or select No to cancel 5 Press F2 to save 56 Continuous Level with HART Technical Reference Manual Advanced functions New hardware or EEPROM corrupt applies only to LSTH The transmitter contains
34. To check if the problem is recurring after acknowledging the alarm cycle power to the unit If alarm occurs again it indicates a hardware problem Perform the procedure Repairing corrupted EEPROM on page 58 Not used in standard software Consult Ohmart special software Not used in standard software Consult Ohmart special software A source holder shutter check is due Alarm is acknowledged by logging a shutter check under initial setup system parameters source functions screen See page 86 for details The CPU board detects a configuration mismatch The CPU board or sensor assembly may have been replaced or one of the EEPROM configurations is erroneous Refer to page 57 for more information Less than one count seen in the last 10 seconds Configurable by Field Service Indicates the sensor is malfunctioning The current process value is not within the limits set by the Max level and Min level in the gauge span settings The high voltage on the PMT is outside the usable range Check wiring on CN2 Continuous Level with HART Technical Reference Manual Diagnostics and repair Analog alarm If the current loop output analog output is stable at either 2mA or 22mA the analog alarm is set The analog alarm is set when the counts from the detector falls below a set threshold indicating that the detector is not outputting enough counts to make a meaningful measurement This is also known as zero counts If the an
35. glass feedback resistor The glass resistor is especially prone to failure if exposed to dust contamination or oils from contact with skin Only clean it with acetone when necessary to remove oils or dust On the DF amplifier the W1 switch combinations select the gain resistors R2 through R5 The factory sets the switch combinations so that the feedback resistor and gain resistors produce a 9 10 V output on an empty vessel On some installations these feedback resistors may need adjustment in the field Do not change these gain resistor settings without first consulting Ohmart CTC temperature controller The DF amplifier requires a steady operating temperature of 140 F 60 The temperature controller monitors the amplifier housing temperature with a thermistor The CTC controls a heater blanket that surrounds the amplifier housing A safety thermostat cuts the power to the heater blanket if the temperature exceeds 190 F 88 and reinstates power at 160 F 71 Heated ion chamber models H LJTH and H LNTH have a heater blanket that surrounds both the amplifier housing and the ion chamber Heated ion chambers are for applications requiring extremely high accuracy or for active lengths less than 36 inches 14 Continuous Level with HART Technical Reference Manual Introduction lt SUPPLY HOUSING TOP CTC TEMPERA URE CONTROL EARTH GROUND WIRE DETECTOR HOUS LENGTH PER APPLICATI USER INTERC
36. menu 4 Return to the Auxiliary input menu 5 From the Auxiliary input menu select Filter TC 6 Set the filter time constant For best response this value should be five seconds If this value is too large gt 10sec the system response slows with long settling times on the final output 7 From the Compensation menu select Vapor 8 From the Vapor menu select Gain Set the Gain to 1 0 e You adjust it again during the calibration procedure 9 If using a hand held HART communicator press F2 to send the settings to the transmitter Continuous Level with HART Technical Reference Manual 139 Appendix Il Special applications Calibrating with vapor compensation Before calibrating make sure the vapor compensation option is set up see Procedure 53 Note To calibrate the vapor pressure compensation system you must be able to adjust both the product level and the vapor pressure Calibrating with vapor compensation Procedure 54 Calibrating with vapor compensation 1 Set the vapor pressure to a typical pressure this is the reference pressure At this point the product level is not important as long as the density gauge is not blocked by the product 2 From the Main menu select Initial setup 3 From the Initial setup menu select Auxiliary input 4 From the Auxiliary input menu select Vapor 5 From the Vapor menu select Aux data collect This determines the reference counts for the vapor compensation algorith
37. normal operation Frequency input 0 100 2 Analog input Optional temperature compensation multiple gauge linking and others FLASH and two EEPROMs Maintains time date and source decay compensation Year 2000 compatible 5V Memory Corruption HART 30V CPU Active Auxiliary High Voltage Relay amp Field Strength Power specifications change to 115 VAC or 230 VAC if an internal heater kit is used For more information see page 142 Continuous Level with HART Technical Reference Manual LNTH specifications System Accuracy Active Lengths Typical Sources Power Requirements Signal Cable Housing Detector Weight Current Loop Output Relay Output HART Communication Serial Communication Auxiliary Input Capability Electronics Diagnostics Introduction Table 5 LNTH specifications 1 of span typical Model LNTH Cesium 137 Cobalt 60 AC Wire size Maximum length HART signal CSA Certification CENELEC Certification Temperature Humidity Vibration Material Paint 12 60 305mm 1524mm 72 120 1 829mm 3 048mm Rating Power Software user settable Rating HART Protocol on current loop output PC interface Optional hand held interface Full duplex RS 422 485 port 2 400 baud Type Possible function On board memory Real time clock LED indication Accuracy depends on specific application parameters 12 120 305mm 3 048mm in 12 305mm increments
38. of density is indicated See Select gauge type linear table 42 linearizer linear table 42 non linear table 42 Linearizer choosing 42 low temperature application 144 Max Level 39 entry in initial setup 104 Message user defined in System information 109 milliamp output test mode 61 Min Level 39 entry in initial setup 104 Min Max history 56 N New hardware advanced function 58 New hardware found alarm acknowledge 76 alarm setup 111 diagnostics check 76 in diagnostic history 79 New hardware found message responses to 58 Next wipe shutter check due 108 No device found message 81 non linear table 42 0 Ohmart Customer Service 10 Field Service 10 Field Service 1 95 Ohmart Parts and Repairs 90 Ohmart View software differences with communicator 19 Ohmart View Software 18 P percent count range 54 percent process span 54 poll address 68 Poll address 68 Primary channel 53 process alarm 77 override switch 77 setting relay as 114 Process alarm 71 Process chain 53 Process out of measurement range alarm setup 111 Process out of range alarm acknowledge 76 diagnostics check 76 in diagnostic history 79 Process standardize type 100 176 Continuous Level with HART Technical Reference Manual Process variables 55 PV process value 55 Rc radiation field at detector 82 RAM corrupt alarm acknowledge 76 alarm setup 111 in diagnostic h
39. organized Please make suggestions for improvement Was information you needed or would find helpful not in this manual Please specify Please send this page to Ohmart Corporation Director of Engineering 4241 Allendorf Drive Cincinnati 45209 1599 xviii Continuous Level with HART Technical Reference Manual Chapter 1 Introduction Nuclear materials notice This equipment contains radioactive source material that emits gamma radiation Gamma radiation is a form of high energy electromagnetic radiation Only persons with a specific license from the U S NRC or other regulating body may perform the following to the source holder Dismantle e Install e Maintain Relocate Repair e Test Ohmart Field Service engineers have the specific license to install and commission nuclear gauges and can instruct you in the safe operation of your density gauge To contact Ohmart Field Service call 513 272 0131 Users outside the U S and Canada may contact their local representative for parts and service Note Special instructions concerning your source holder are found in the envelope that was shipped with the source holder and the Radiation Safety for U S General and Specific Licensees Canadian and International Users Manual and Radiation Safety Manual Addendum of Reference Information Please refer to this document for radiation safety information Continuous Level with HART Technical Reference Manu
40. output locked See section at either on analog alarms 2 or 22mA Yes for diagnostics No LED Diagnostics checks CPU may Is CPU LED 5 be locked up LED 5 CPU locked up flashing not flashing Replace CPU board No Cycle power Yes LED 2 flashing or ON Is LED 2 indicates a memory OFF problem See manual No LED table for more info Yes Call Ohmart Check all other LED Field Service conditions 0 5 513 272 0131 Figure 28 Transmitter not responding flowchart part 2 Continuous Level with HART Technical Reference Manual 85 Diagnostics and repair Maintenance and repair Periodic maintenance schedule Since the Ohmart level transmitter contains no moving parts very little periodic maintenance is required We suggest the following schedule to prevent problems and to comply with radiation regulations Table 17 Periodic maintenance schedule Description Frequency Procedure As required by process conditions usually Standardize at least once a month Calibration chapter Every six months unless otherwise Radiation safety instructions shipped Source holder required by applicable nuclear regulatory separately with source holder and following shutter check agency instructions Every three years unless otherwise Radiation safety instructions shipped required by applicable nuclear regulatory separately with source holder and following Source wipe agency instructions Source wipe and shutter check recording The Ohm
41. the default value as the actual value of the standardization material that displays the detector counts the calculated process value and a field for the user to input the actual value of the level The prompt asks Edit Counts Select No to continue or Yes to input the average counts 5 Press F2 to send Continuous Level with HART Technical Reference Manual 51 Chapter 4 Advanced functions Functions not required for normal operation of the transmitter are found in the software menu structure under the heading Advanced Fxns These functions are primarily for use by Ohmart personnel for advanced troubleshooting and repair This chapter gives a basic explanation of these functions Ohmart strongly recommends that you ask our advice before using any of these advanced functions Process chain The process chain is a description of the transmitter software s calculation of a level measurement from a radiation reading In the Process chain screen you can view intermediate values of the calculation to verify proper functionality of the software Primary channel Press the hot spot key gt gt gt on the hand held communicator to display the Primary channel screen The display values for the Primary channel screen are Temp Temperature displays the internal probe s measurement of the sensor temperature This does not apply to ion chamber detectors models LNTH and LJTH Sensor cnts Displays
42. the sensor counts that are true counts output from the sensor before application of the following e Temperature compensation e Standardize e Sensor uniformity gains TC counts Displays temperature compensated counts that are sensor counts with application of temperature compensation Raw counts Displays raw counts that are temperature compensated counts with application of uniformity gain Continuous Level with HART Technical Reference Manual 52 Advanced functions Adj counts Displays adjusted or sum counts that are raw counts plus auxiliary raw counts In most applications this does not use auxiliary input so sum counts are equal to raw counts SD counts Displays source decay counts that are sum counts with application of source decay gain Stdz counts Displays standardize counts that are source decay counts with application of standardization gain Cnt range Displays compensated measurement counts that express as a percent of the counts at the high and low endpoints of the calibration determined with the two point initial calibration This quantity shows where the current measurement is in relation to the total count range count range 100 x Cs CL where Cs sum counts counts at Cal low level and Cal high level counts range of span The percent process span indicates the measurement value as a percent of the measurement span The maximum and minimum l
43. 20 wires to communicate with the level transmitter A minimum requirement is a 2500 load resistance on the current loop The hand held terminal is Rosemount model 275 or equivalent Ohmart number 236907 A HART modem may also connect across the 4 20mA wires to enable communication between the level transmitter and an IBM compatible PC Continuous Level with HART Technical Reference Manual 25 Installation Process alarm override switch If the output relay is set as a process alarm relay high or low level alarm you can install an override switch to manually deactivate the alarm If you do not install an override switch the process alarm relay de energizes only when the measured level is out of the alarm condition The function of the output relay is set in the Alarms screen from the Initial Setup menu Conduit Conduit runs must be continuous and you must provide protection to prevent conduit moisture condensation from dripping into any of the housings or junction boxes Use sealant in the conduit or arrange the runs so that they are below the entries to the housings and use weep holes where permitted You must use a conduit seal off in the proximity of the housing when the location is in a hazardous area Requirements for the actual distance must be in accordance with local code If you use only one conduit hub plug the other conduit hub to prevent the entry of dirt and moisture 26 Continuous Level with HART Technical Refere
44. 45 y ul syun S19jourejed 125 c spun ssa2oJd 5592044 Figure 46 Process parameters 157 Continuous Level with HART Technical Reference Manual pass YD 1X9ON c adim 1X9N enp ynus adim 6 SOA YO INYS 5 xu 1nus Figure 47 System parameters Continuous Level with HART Technical Reference Manual ONZ adim Z ON d SS WW HH Z 103414559 c SAep3 3 09 05 A agessow L 12159 6 uonounj g ed pue Appendix IV HART menus screens 5 5 158 Appendix IV HART menus screens SH HH YU v S ajAD c 63 uue e t 14104155 4O HO 10
45. 8u3 Aly L Gauge status Figure 57 Continuous Level with HART Technical Reference Manual 166 Appendix IV HART menus screens 5 902 Z 12195 10suas 9 ON 5 G 1591 G JOA JOA JEMU 1591 1591 xny ON uleyd jeuueuo xny Josuas e 1591 105095 Z Ne 5592044 C adh 9828 129195 9828 129195 105 5 1594 1 20 d 1015 n 3591 p paey 151 uey 3e3 yoajas 8 8 129195 9 29910 4 M N c 55 Figure 58 Advanced Fxns 167 Continuous Level with HART Technical Reference Manual Appendix IV HART menus screens 0 Sjunoo 11 sjunoo Med xny AH 6 HEHE ule 2 5 8
46. 9115 L indui Figure 49 Auxiliary input Continuous Level with HART Technical Reference Manual 160 Appendix IV HART menus screens 4 4mA Level 3 20mA Level o0 E Ei 2 gt S 5 ig ge 3k l Es Figure 50 View settings Continuous Level with HART Technical Reference Manual 161 Appendix IV HART menus screens 5 Linearizer 4 Current loop cal Calibrations 3 Data collect Counts 2 Process 51427 1 Initial cal Figure 51 Calibrations 162 Continuous Level with HART Technical Reference Manual Appendix IV HART menus screens AA QQ WW 2 INCA ON Z c uone nopeo angea uonaque 8 5 Z SYUNOD 59 2 gt 4 AL Hesqies quod uoqesqies NL amp 9n e pI AA QQ WW INPA 4 edie THESE ONL 3utod Ups gt 22
47. C voltage level to electronics Memory corruption EEPROMs FLASH HART communication indicator Analog output loop voltage Central processing unit on CPU board heartbeat Auxiliary input frequency signal indicator Sensor high voltage Relay condition indicator Radiation field indicator Table 16 LED summary table Normal condition ON LED 1 is hardwired to 5 DC OFF ON Blinks when receiving HART messages ON Blinks at rate of one time per second Blinks if auxiliary input present OFF if no auxiliary input present ON High voltage is in spec ON When relay is energized OFF When relay is de energized LED 8 is hardwired to relay Cycles in proportion to radiation field intensity at detector ON for 10 seconds for each mR hr then off for 2 seconds Can use LED 5 that blinks 1 time sec to time LED 9 for field indicator Error condition OFF Electronics are not receiving 5 DC voltage required for functioning 1 blink CPU EEPROM corrupt 2 blinks Sensor EEPROM corrupt 3 blinks Both EEPROMs corrupt 4 blinks RAM corrupt 5 blinks Memory mismatch ON solid combination of errors None OFF 30V not present on 4 20mA output 4 20mA output and HART communications are bad LED does not blink CPU not functioning None OFF High voltage is out of spec None None Recommendation Verify 5V on test points Check fuse on CPU board C
48. EC Certification Temperature Humidity Vibration Material Paint Detector weight Rating Power Software user settable Rating HART Protocol on current loop output PC interface Optional hand held interface Full duplex RS 422 485 port 2 400 baud Type Possible function On board memory Real time clock LED indication Accuracy depends on specific application parameters 6 72 153mm 1 829mm 6 153mm increments 0 66MeV gamma radiation emitter 30 2 year half life 1 2 and 1 3 MeV gamma radiation emitter 5 3 year half life 90 270VA 10 C at 50 60Hz at 20VA maximum power consumption 30VA max with internal heater for low ambient temp CE compliance requires 100 230VAC 10 30VDC less than 100mV 1 1 000 2 ripple at 10VA CE compliance requires 24VDC 14 22AWG 1 63 0 643 3 280ft 1 000 m 18 22 AWG 1 02 0 643 two conductor shielded 18 22 AWG 1 02 0 643mm four conductor shielded Designed to meet National Electric Code U S amp Canada Class Groups A B C amp D Division 1 amp 2 Class Il Groups E F amp G Division 1 amp 2 EExd T5 IP 66 4 F 140 F 209 602 option for lower temperatures available water cooling required above 140 F 60 C 0 95 non condensing 0 5g at 300cps Carbon Steel others optional Epoxy Powder Coat 4410 1 02 active length in inches 20kg 0 0186kg active length in mm 4 20mA isolated into 250 1 000
49. Figure 65 Select gage location 173 x Continuous Level with HART Technical Reference Manual Procedures Procedure 1 Procedure 2 Procedure 3 Procedure 4 Procedure 5 Procedure 6 Procedure 7 Procedure 8 Procedure 9 Procedure 10 Procedure 11 Procedure 12 Procedure 13 Procedure 14 Procedure 15 Procedure 16 Procedure 17 Procedure 18 Procedure 19 Procedure 20 Procedure 21 Procedure 22 Procedure 23 Procedure 24 Procedure 25 Procedure 26 Procedure 27 Procedure 28 Procedure 29 Procedure 30 Procedure 31 Procedure 32 Procedure 33 Procedure 34 Procedure 35 Procedure 36 Continuous Calibrating the current loop 32 Choosing a linearizer method 42 Performing a data collect 43 Setting the cal low density 45 Setting the cal high level 46 Collecting linearizer table data 47 Calculating the linearizer 48 Calculating the calibration result 49 Standardizing the gauge 51 Resetting the minimum and maximum history 56 New Hardware Found message with new CPU board 58 New Hardware Found message with new sensor 58 Repairing corrupted EEPROM 59 Start mA output test mode 61 Exit mA output test mode 61 Start Sensor test mode 63 Exit Sensor test mode 63 Start Auxiliary test mode 64 Exit Auxiliary test mode 64 Start Relay test mode 65 Exit Relay test mode 65 Start Temperature test mode 66 Exit Temperature test mode 66 Checking equipment version and serial numbers 68 Selec
50. HART Technical Reference Manual 93 Diagnostics and repair Returning equipment for repair Procedure 31 Returning equipment for repair 1 Call Ohmart Nuclear Products Repair at 513 272 0131 between Monday and Friday 8 00 A M to 5 00 P M United States Eastern Standard Time 2 Ohmart assigns the job a material return authorization MRA number Please note Ohmart reserves the right to refuse any shipment that does not have a MRA number assignment 3 Indicate the MRA on the repair service purchase order 4 Clearly mark the shipping package with the MRA number 5 Send the confirming purchase order and the equipment to Ohmart Corporation Attention Repair Department 4241 Allendorf Drive Cincinnati OH 45209 1599 USA Note You must first contact Ohmart and receive a material return authorization number MRA before returning any equipment to Ohmart Ohmart reserves the right to refuse any shipment not marked with the MRA number 94 Continuous Level with HART Technical Reference Manual Appendix I Initial factory setup Perform all setup functions from the Initial setup menu These functions include the following e Process parameters e System parameters Alarms Auxiliary inputs Spans setup Perform setup before the initial calibration since some parameters are necessary for calibration Some of these parameters are e Units e Data collect times Continuous Level with HART Technical Reference M
51. HART menus and screens Continuous Level with HART Technical Reference Manual 153 uone nuls 6 uoneoo 2321015 p 5 Z 8 5 ainssald auou ON Kann Appendix IV HART menus and screens 931489 q K uenboJJ pe12euuoo JOU 1 Continuous Level with HART Technical Reference Manual Figure 43 HART screen Transmitter not connected 154 Appendix IV HART menus screens sux4 paoueApy 501815 suoneJqie dnjes peul urew He ino AnD c 76 TIE ER 9497 L sainyeaj 12 Figure 44 HART screen Online 155 Continuous Level with HART Technical Reference Manual Appendix IV HART menus screens ana 9 1 VWOZ 5 6 Sely sueds p anos Suus 9 9 Z
52. INAL SEE NOTE 4 ERMINAL Figure 38 Interconnect LJF LNF LSF with LJTH LNTH or LSTH 131 Appendix II Special applications Initial settings and calibration requirements for NORM compensation Specific software settings and calibration procedures are required for NORM compensation Setting up NORM compensation Procedure 51 Setting up NORM compensation 1 From the Main menu select Initial setup 2 From the Initial setup menu select Auxiliary input 3 From the Auxiliary input menu select Compensation The compensation screen displays the current type of auxiliary input 4 From the Compensation menu select Type 6 From the Type menu select Compensation 7 Press F4 to enter 8 If using a hand held HART communicator press F2 to send the settings to the transmitter 132 Continuous Level with HART Technical Reference Manual Appendix Il Special applications Calibrating with NORM compensation Before calibrating make sure the NORM compensation option is set up Refer to Procedure 51 Continuous Level with HART Technical Reference Manual 133 Appendix Il Special applications 10 11 12 13 134 Procedure 52 Calibrating with NORM compensation Set the product level to maximum Turn the source holder shutter to OFF this ensures that the only radiation picked up by the detector comes from the product and not the source P
53. Level screen enter the minimum value for the measurement span 7 From the Current loop span menu select 20mA Level 8 In the 20mA Level screen enter the maximum value for the measurement span 9 Press F2 to send the setting to the transmitter Continuous Level with HART Technical Reference Manual 103 Appendix Initial factory setup System parameters The system parameters define settings for the internal operation of the level transmitter and the radiation source Time Current time in 55 as set in the real time clock The time maintains during power failure for up to 28 days It is important to enter the correct time and date because they are used for several internal calculations Time reverts to 00 00 00 on clock failure Date Current date in MM DD YY month day year format The date reverts to 00 00 00 on failure Setting the time and date Procedure 38 Setting the time and date 1 From the Main menu select Initial setup 2 From the Initial setup menu select System parameters 3 From the System parameters menu select the Time and Date 4 From the Time and Date menu select Time e Enter the current time e Press F4 to save the time setting e Press the LEFT ARROW key to return to the previous Time and Date screen 5 From the Time and Date screen select Date Enter the current Date e Press F4 to save the date setting 6 If using a hand held HART Communicator press F2 to send the updated para
54. Level with HART Technical Reference Manual 9 Introduction Principle of operation Ohmart s continuous level gauge is a nuclear gauge that receives a shaped or collimated beam of radiation through the process material from the source holder The material in the vessel acts as a shield that prevents a portion of the detector from exposure to the radiation field As the level decreases the detector senses more radiation As the level increases the detector senses less radiation Calibration of the level gauge associates the detector readings known as counts with the level of the material in engineering units The output range of the gauge is a 4 20mA current loop signal in proportion to the level of the process See Appendix I for examples of process value settings 10 Continuous Level with HART Technical Reference Manual Introduction System overview The level measurement system consists of three main components 1 Source holder 2 Detector assembly model LSTH LJTH or LNTH 3 Communication device HART modem with PC or HART Communicator model 275 Housing Source Holder Hand held Terminal 4 20mA Current Loop Computer Figure 3 System overview The following statements describe the source holder cast or welded steel device that houses a radiation emitting source capsule Directs the radiation in a narrow collimated beam through the process vessel
55. ONNEC 7 DF AMPLIFIER 22222222221 y 7 2727277227771 22722222727 DETECTOR LENGTH PER APPLICATION Figure 7 LJTH electronics assembly Continuous Level with HART Technical Reference Manual 15 Introduction Communicating with the gauge The Ohmart continuous level gauge is a transmitter so it produces the current loop signal directly at the measurement site Use either a HART Communicator or HART modem and Ohmart View software with a PC to enable the following e Initial setup e Calibration e Other communication with the gauge You can make a connection anywhere along the 4 20mA current loop line After setup and calibration of the level gauge there are no day to day requirements for external electronics Hand Held or HART Modem amp PC H1 H2 Hand Held or HART Modem amp PC Figure 8 HART connections Using a universal hand held terminal Ohmart s LSTH LNTH and LJTH level gauges are compatible with the Fisher Rosemount HART Communicator The HART Highway Addressable Remote Transducer Communicator uses the Bell 202 Frequency Shift Keying technique to superimpose high frequency digital communication signals on the standard 4 20mA current loop To function the minimum load resistance on the 4 20mA loop must be 250ohms Refer to the instruction manual for your HART Communicator for information on t
56. TH only e EEPROM e Alarm type 1 e Alarm type 2 e Shutter check due e Sensor fail e Process out of range e Sensor voltage out of spec LSTH only Use this information to determine if a problem has recently occurred and internally repaired An example of this would be an EEPROM corruption Continuous Level with HART Technical Reference Manual 77 Diagnostics and repair Hardware diagnostics Figure 22 may be helpful in finding the following items on the CPU circuit board Test points Fuses Jumpers Connectors OHMART CORPORATION HART CPU BOARD 238391 MADE IN USA REVIS 200000909990 Figure 22 CPU board simplified component layout Test points You can access test points on the CPU board by pulling the sensor assembly slightly out of the housing Table 14 Test point labels and descriptions Test point label Description H1 HART connection H2 HART connection 5V 5V power supply test point reference to logic ground 5V 5V power supply test point reference to logic ground COM Logic ground CNT Counts raw input signal coming from preamp Referenced to isolated ground Iso 30V Isolated power IsoG Isolated ground Sink Loop current test point 200mV mA loop current Referenced to isolated ground 78 Continuous Level with HART Technical Reference Manual Diagnostics and repair Jumpers Jumpers J5 and J6 on the CPU board set the current loop source or sink mode The HART level transmit
57. agnostics it may be important to know the following information e Sensor voltage e Poll address e Version of firmware on the FLASH installed on the level transmitter e Hardware version number e Equipment serial numbers e Temperature coefficients Sensor voltage LSTH only Sensor voltage displays the scintillator model LSTH sensor voltage It does not apply to ion chamber detectors models LNTH and LJTH Poll address Poll address displays the HART poll address of the transmitter Each transmitter in a current loop must have a unique poll address This value is meaningful only when multiple transmitters connect on the same loop Firmware version Firmware version displays the firmware version number Hardware version Hardware version displays the hardware version number CPU Serial Number CPU Serial Number displays the CPU serial number Sensor Serial Number Sensor Serial Number displays the sensor serial number View temperature coefficients LSTH only The algorithm that compensates for variations in measurement output with changes in temperature uses temperature coefficients The Ohmart factory determines the coefficients through rigorous testing You cannot change these values through normal operation This does not apply to ion chamber models LJTH and LNTH Continuous Level with HART Technical Reference Manual 67 Advanced functions Checking the sensor voltage poll address version and serial numbers Proce
58. air the corruption from the EEPROM backup Procedure 13 Repairing corrupted EEPROM 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu select New hardware 3 From the New hardware menu select No new hardware 4 At the prompt Do You Want To Reconcile Differences select Yes to allow restoration from backups on the EEPROMs Or select No to cancel Continuous Level with HART Technical Reference Manual 59 Advanced functions Test modes Five independent test modes are available These test modes are 1 mA Out test mode 2 Sensor test mode 3 Aux Inp test mode 4 Relay test mode 5 Temperature test In the test modes the transmitter stops measuring the process material and allows manual adjustment of critical variables for troubleshooting The test modes enable independently However you can use them in combination to test multiple variable effects All of the test modes time out automatically after one hour if you do not manually exit CAUTION While in a test mode the transmitter is not measuring process and so its current output does not reflect the process value If your DCS is controlling from the transmitter s current output be sure to remove the system from automatic control before entering a test mode The software screens prompt you to do so before entering test mode Milliamp output test mode Use the milliamp output test mode to manually force the current output to a specified v
59. al Notes on the frequency output detector You may not receive a separate manual for the detector that provides the frequency output for the HART level transmitter especially if ordered as part of a complete system that included a HART level transmitter The certified drawings and this manual section have sufficient information in most cases Some special notes about the frequency output detector are below e Models LSF LNF and LJF use much of the same hardware as the models LSTH LNTH and LJTH the HART level transmitter models They look similar so verify that you are installing the correct detector as the frequency output slave detector e Models LSF LNF and LJF use a different version of firmware than LSTH LNTH and LJTH This firmware enables a frequency output instead of the HART output Some spare parts are unique to the frequency output models See the following tables for the spare part descriptions and part numbers 120 Continuous Level with HART Technical Reference Manual Appendix Il Special applications LSF spare parts Table 26 LSF spare parts Description Ohmart part number AC power supply board 237382 LSF CPU board 238748 125 mA fuse on CPU board 238661 2 5 A fuse on CPU board 238662 LJF spare parts Table 27 LIF spare parts Description Ohmart part number LJF CPU board 238928 DF Amplifier 200216 CTC 6 115 VAC power supply 227283 CTC 6 230 VAC power supply 227284 LJTH 115 VAC complete
60. al 1 Introduction Unpacking the equipment CAUTION Make sure that you are familiar with radiation safety practices in accordance with your U S Agreement State U S NRC or your country s applicable regulations before unpacking the equipment Unpack the unit in a clean dry area Inspect the shipment for completeness by checking against the packing slip Inspect the shipment for damage during shipment or storage If the detector is included as a separate package in the shipment inspect the assembly for damage that may have occurred during shipment or storage If there was damage to the unit during shipment file a claim against the carrier reporting the damage in detail Any claim on the Ohmart Corporation for shortages errors in shipment etc must be made within 30 days of receipt of the shipment If you need to return the equipment see the section Returning equipment for repair to in the Diagnostics and Repair chapter After you unpack the equipment inspect each source holder in the shipment to assure that the operating handle is in the OFF position In the event that you find the handle in the ON position place it in the OFF position immediately and secure it Note Most source holder models accept a lock Call Ohmart Field Service immediately for further instructions at 513 272 0131 if the source holder has one of the following conditions Do
61. alarm e Specialized parameters of the x ray alarm 108 Continuous Level with HART Technical Reference Manual Appendix Initial factory setup Diagnostic alarm setup Diagnostic alarms give information about the condition of the level transmitter and can provide reminders to perform periodic maintenance procedures The reminders appear as messages on the HART screens when a HART device connects to the level transmitter In addition if the level transmitter relay is set as a diagnostic alarm the condition trips the relay on In the setup there is a list of every diagnostic alarm condition that can toggle On or Off If the condition flag is Off that condition does not cause the diagnostic alarm relay to trigger and no HART message appears The following table lists the available diagnostic alarms conditions See the Diagnostics and Repair chapter page 74 for more details Table 22 Diagnostic alarm conditions RAM corrupt Standardize due CPU EEPROM corrupt Sensor EEPROM corrupt LSTH Source wipe due Alarm Type 1 only Flash corrupt New hardware found LSTH only Alarm Type 2 Real time clock Sensor fail Shutter check due Sensor temp LSTH only Sensor high voltage fail Process out of measurement LSTH only range Continuous Level with HART Technical Reference Manual 109 Appendix Initial factory setup Setting the diagnostic alarm conditions Procedure 43 Setting the relay as a diagnostic alarm 1 From the Main men
62. alog alarm is on check the following Source holder shutter is in the On or Open position to create the required radiation field Extreme build up on walls or other material shielding the detector from the radiation field Damage or disconnection of electrical connections from the sensor assembly to the CPU board See the Power Intraconnect Diagram on page 81 for a diagram of the electrical connections on the connector Process alarm The process alarm alerts users when the process level is above a setpoint high limit or below a setpoint low limit Enter the choice of low or high limit and the setpoint in the Initial setup screens See Appendix I Initial Factory Setup for details The process alarm works only with the output relay No HART messages gauge status diagnostics or history information saves for the process alarms The level transmitter acknowledges or resets the process alarm when the process value returns back to the setpoint value Depending on your usage of the process alarm relay you may want to install a process alarm override switch to manually turn off an annunciator when the level transmitter relay energizes X ray alarm The x ray alarm compensates for false indicated process values that occur when the gauge detects external radiographic sources For example vessel weld inspections often use portable radiographic x ray sources X rays that the gauge detects cause a false low reading an
63. alue This is useful for verifying the current loop calibration Instructions to calibrate the current loop are available in the Calibration chapter of this manual Note While in milliamp test mode the HART communication may post a Status error This is expected and not an indication of a failure If the message Status Error Ignore Next xx Occurrences displays select Yes to ignore the Status Error 60 Continuous Level with HART Technical Reference Manual Advanced functions Start milliamp output test mode Procedure 14 Start mA output test mode 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu select Test mode 3 From the Test mode menu select mA Out test mode 4 From the mA Out test mode menu select Enter mA test mode 5 At the prompt enter the value of the current output you want to force 6 At the prompt select Yes to start the test mode and send new data 7 The transmitter continues functioning in milliamp test mode until it times out after one hour or until you choose Exit mA test mode Exit milliamp output test mode Procedure 15 Exit mA output test mode 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu select Test mode 3 From the Test mode menu select mA Out test mode 4 From the mA Out test mode menu select Exit mA test mode 5 At the prompt select Yes to exit the test mode Continuous Level with HART Technical Reference Manual 61 Ad
64. alue in process units as entered in the Initial setup screens Use this to calculate the measurement span Min level Displays the minimum level that is the value in process units as entered in Initial setup screens Use this to calculate the measurement span Temp comp gain Temperature compensation gain displays the current value of the temperature compensation gain Use this to adjust for inherent sensor output change with temperature Uniformity gain Uniformity gain displays the current of the uniformity gain Use this to force all level sensors to output the same counts at a given radiation field Most level applications do not use uniformity gain and have it set as default value of 1 0 54 Continuous Level with HART Technical Reference Manual Advanced functions Source decay gain Source decay gain displays the current value of the source decay gain Use this to compensate for the natural decay of the radiation source which produces a lower field over time Stdz gain Displays the current value of the standardize gain that adjusts with each standardize procedure HV setting HV setting displays the HV setting feature that is the set point for sensor high voltage Aux channel chain The display values for the Aux channel chain screen are Aux raw counts The Auxiliary raw counts field displays the frequency input counts from optional auxiliary input Filt counts Filtered counts displays the filtered auxiliary counts
65. and values Review the values You can manually edit the counts and actual or new data can be collected by repeating the Set low and Set high procedures or press F4 to continue 6 The prompt Proceed with Calibration Calculation displays Select Yes to proceed with the calculation 7 Press 2 to save Continuous Level with HART Technical Reference Manual 49 Calibration When a new calibration may be necessary Under most circumstances you do not need to repeat the calibration procedure The system requires only periodic standardization to compensate for drifts over time However certain events necessitate a new initial calibration The events are e Measurement of a new process application contact Ohmart for recommendation e Process requires a new measurement span e Entry of anew measurement span setting into the software e Installation of a new radiation source holder e Moving the level transmitter to another location in U S only specifically licensed persons may relocate the gauge e Changes to the process vessel for example lining insulation or agitator e Excessive build up or erosion of vessel that standardization cannot compensate for check standardize gain e Standardize gain is greater than 1 2 after a standardization indicating it made a 20 adjustment from the initial calibration Periodic process standardization Standardization adjusts the system by resetting one point of the calibration curve to an
66. and then contact Ohmart Field Service Radiation Safety for the combination Do not remove the lock if the gauge has a general license tag installation is in the U S and you do not have the specific license that gives you permission to remove the lock You can verify Continuous Level with HART Technical Reference Manual 27 Installation whether the gauge is a general license gauge by checking the source holder for the general license tag If it is not there it is not a general license device If you do not have permission to remove the source holder lock an Ohmart Field Service Engineer or another person with this specific license must remove it for you 28 Continuous Level with HART Technical Reference Manual Installation Field service commissioning call checklist In many U S installations an Ohmart Field Service Engineer commissions the gauge To reduce service time and costs use this checklist to ensure the gauge is ready for commission before the Field Service Engineer arrives Mount the source holder and detector per the certified drawings found in the custom information folder in this manual allowing access for future maintenance Make all wiring connections per the certified drawings and the Wiring the Equipment section in this manual Tie in the wiring from the field transmitter analog output to the DCS PLC chart recorder Ensure that the AC power to the transmitter is a regulated tr
67. ansient free power source UPS type power is the best If using DC power verify that the ripple is less than 100 millivolts Models LUTH and LNTH require 12 hours warm up time with power applied before calibration Have process ready for calibration When possible it is best to have process available near both the low and high end of the measurement span When possible it is best to be able to completely fill and empty the vessel at the high and low levels for the initial calibration procedure and when possible at 10 increments in between for the linearization procedure Do not remove the lock on the source holder Notify Ohmart Field Service if there is damage to the lock or it is missing Continuous Level with HART Technical Reference Manual 29 Chapter 3 Calibration All of these functions group together the Calibrations screens See Appendix of this manual for Calibrations menus and screens Before using the level transmitter to make measurements you must perform the following e Calibrate it to relate the detection of radiation from the source to the level of the process material e Calibrate the current loop to a reference ammeter or the DCS e Periodically you must standardize the system on process to adjust for changes over time Note lon chamber detector models LUTH and LNTH require a warm up time before calibration or any time there is an interruption in power Ohmart reco
68. anual 95 Appendix Initial factory setup Process parameters Units Level units The following engineering units are available for a level measurement In inches ft feet cm centimeters mm millimeters m meters percent Spcl special used in conjunction with Custom units below Custom units You can program a custom unit if the unit you require is not in the standard list Choose the unit Spcl Special from the Units screen Enter the numeric conversion factor in the form custom units inch Setting the process units for density applications 96 Procedure 32 Setting the process units for density From the Main menu select Initial setup From the Initial setup menu select Process parameters From the Process parameters menu select Process units From the Process units menu select Level units From the Level units screen scroll through the list and choose the correct level unit for your process by pressing F4 to enter You will need to enter a custom unit if the unit you want is not in the list See the procedure for setting custom units in this section After selecting the units press F2 to send the information to the transmitter This ensures that other setup and calibration functions you perform use the desired engineering units Continuous Level with HART Technical Reference Manual Appendix Initial factory setup Setting custom units Procedure 33 Setting custom units 1 From
69. ardization 51 Continuous Level with HART Technical Reference Manual iii CHAPTER 4 ADVANCED FUNCTIONS 52 Process chain 52 Primary channel 52 Process variables 54 Aux channel chain 55 Min Max history 55 Resetting the minimum and maximum history 56 New hardware or EEPROM corrupt applies only to LSTH 57 Proper response to New hardware found message if new hardware HAS been installed 57 Proper response to New hardware found message if new hardware HAS NOT been installed CPU EEPROM Corrupt message Sensor EEPROM Corrupt message 58 Test modes 60 Milliamp output test mode 60 Sensor test mode 62 Auxiliary input test mode 64 Relay test mode 65 Temperature test mode 66 Other advanced functions 67 Checking the sensor voltage poll address equipment version serial numbers and temperature coefficients 67 Sensor voltage LSTH only 67 Poll address 67 Firmware version 67 Hardware version 67 CPU Serial Number 67 Sensor Serial Number 67 View temperature coefficients LSTH only 67 Select gauge type 69 Select gauge location 69 CHAPTER 5 DIAGNOSTICS AND REPAIR 70 Software diagnostics 70 Diagnostic alarm 70 Analog alarm 70 Process alarm 70 X ray alarm 71 Gauge status 72 Diagnostic alarms and HART messages 72 Gauge status diagnostics screens 72 Acknowledging diagnostic alarms 73 Analog alarm 75 Process alarm 75 X ray alarm 75 History information 77 Hardware diagnostics 78 Test points 78 Jumpers 79 LED indicator
70. art level transmitter can automatically remind users when a source wipe and shutter check are due using the diagnostic alarms If you use this feature you must record the source wipes and shutter checks in the software to acknowledge the alarm and to reset the timer Perform the following procedure after a source wipe or a shutter check Refer to the Radiation Safety for U S General and Specitic Licensees Canadian and International Users Manual and Radiation Safety Manual Addendum of Reference Information Recording a source wipe or shutter check Procedure 28 Recording a source wipe or shutter check 1 From the Main menu select Initial setup 2 From the Initial setup menu select System parameters 3 From the System parameters menu select Source function 4 From the Source function menu select Record wipe or select Record shut chk 5 At the prompt select Yes to start recording 86 Continuous Level with HART Technical Reference Manual Diagnostics and repair Check when the next source wipe or shutter check is due Procedure 29 Check due date of source wipe or shutter check 1 From the Main menu select Initial setup 2 From the Initial setup menu select System parameters 3 From the System parameters menu select Source function 4 From the Source function menu select Next wipe shut due 5 From the Next wipe shut due menu select Next wipe due to view the due date 6 From the Next wipe shut due menu
71. art part number LNTH CPU board 238747 DF Amplifier 200216 Power supply 90 270 in 237475 CTC 6 115VAC power supply 227283 CTC 6 230VAC power supply 227284 Thermistor for temp control 227470 Thermostat safety 227485 Heating blanket amplifier housing 214530 LNTH 115VAC complete tested electronics assembly 238552 LNTH 230VAC complete tested electronics assembly 238553 125mA fuse CPU board 238661 2 5A fuse on CPU board 238662 HART Hand held Terminal or 236907 HART Modem kit 237857 These parts also apply to the heated LNTH model H LNTH and the heated LUTH model H LJTH Continuous Level with HART Technical Reference Manual 89 Diagnostics and repair Field repair procedures Very few parts are field repairable but you can replace entire assemblies or boards Use great care to prevent damage to the electrical components of the gauge Ohmart recommends appropriate electrostatic discharge procedures CAUTION NEVER open the black injection molded plastic housing that contains the sensor scintillator and photomultiplier tube components They are sealed and tested at the factory to prevent radiation and light from leaking into the housing No part in the sensor housing is field repairable Opening the housing may permanently damage the sensor 90 Continuous Level with HART Technical Reference Manual Diagnostics and repair Replacing the CPU board You may have to replace the CPU board if there is damage
72. aximum length of shielded 2 conductor 18AWG cable is 1 000m 3 280 ft For indoor or conduit use use Ohmart part number 202676 For outdoors use in cable trays or Class 1 Division 2 hazardous areas use cable part number 202679 Standard output signal is 4 20 into 250 1000 ohms P1 8 is positive and p1 9 is negative HART communication protocol based on Bel 202 FSK standard is available on these connections Output is isolated to standard ISA 50 1 Type 4 Class U Hart Hand held terminal connects across 4 20 wires to communicate with transmitter Use terminal number 236907 Rosemount Model 275 or equivalent Hand held terminal can connect across 4 20mA wires at any point HART modem connects across 4 20mA wires to allow communication between transmitter and an IBM compatible PC Relay contacts rates are 10A at 240VAC or 8A at 24VDC Attach 18AWG green wire with closed lug terminal to housing using 10 32 x screw If using optional CENELEC external ground connect earth ground to outside of housing instead of to PI Pin 3 130 Continuous Level with HART Technical Reference Manual OPTIONAL MODEM SEE NOTE 5 m A INPUT DCS Appendix Il Special applications Continuous Level with HART Technical Reference Manual CODES NOTES 1 amp 8 HAND HELD OPTIONAL HAND HELD TERM
73. ay test mode 3 From the Relay test mode menu select Exit relay test Continuous Level with HART Technical Reference Manual 65 Advanced functions Temperature test mode The temperature test mode enables the user to manually force the LSTH sensor temperature probe output to a specified value This is useful for verifying the scintillator sensor temperature compensation This does not have any effect on LJTH or LNTH systems Start temperature test mode Procedure 22 Start Temperature test mode 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu select Test mode 3 From the Test mode menu select Temperature test mode 4 From the Temperature test mode menu select Enter Temp test 5 At the prompt enter the value of the new temperature you wish to force The transmitter continues functioning in Temperature test mode until it times out after one hour or until you choose Exit Temp test mode Exit temperature test mode Procedure 23 Exit Temperature test mode 1 From the Advanced Fxns menu select Test mode 2 From the Test mode menu select Temp test mode 3 From the Temp test mode menu select Exit Temp test mode 4 At the prompt select Yes to exit the test mode 66 Continuous Level with HART Technical Reference Manual Advanced functions Other advanced functions Checking the sensor voltage poll address equipment version serial numbers and temperature coefficients When performing di
74. ble but need not accurately indicate the level throughout the span of process Typically used for vessels in which it is critical to know Typically used for surge bins or other vessels under the accurate level control that maintains one level The linearizer type chosen must be Non linear table The linearizer type chosen must be Linear table Note The simple calibration method produces a measurement indication that is repeatable but not accurate between the Cal Low Level and Cal High Level points The measurement indication is not linear with respect to the actual process level In some applications accuracy is not critical and this method is valid If your application requires a linear or accurate indication of the actual process level you must use the standard method of calibration Continuous Level with HART Technical Reference Manual 33 Calibration Standard method of calibration Figure 14 illustrates the steps to prepare for and perform a standard method calibration Are process units set correctly Change units in Initial setup screens 15 linearizer set to Table non linear Change linearizer to Table non linear in Calibrations Linearizer screen Is process span set correctly Change measurement span in Initial setup screens Perform these data collection steps in any sequence Perform Set Cal low level and Set Cal hi
75. d adversely affect any control based on the gauge output The x ray alarm can perform the following actions e Alter the current loop output indicate the alarm condition e Trip the output relay if the relay is set up to do so The level transmitter enters the x ray alarm condition when it detects a radiation field above a set threshold The gauge sets the current loop output at its value 10 seconds before the condition It periodically dithers the output about the average cycling until the radiation field is back to the normal level or until a time out period of 60 minutes Continuous Level with HART Technical Reference Manual 75 Diagnostics and repair Figure 21 illustrates the current loop output You can the parameters of the output Refer to Appendix I Initial Factory Setup current loo output mA output 10s before Dither time time ms f Cycle period i Figure 21 X ray interference alarm output 76 Continuous Level with HART Technical Reference Manual Diagnostics and repair History information Information about critical events stores in the Diagnostic history screens from the Gauge status View history menus You can view the newest and oldest trigger records of the following events e RAM corrupt e Sensor EEPROM corrupt LSTH only e FLASH corrupt Real time clock fail e Sensor temperature fail LSTH only e Standardize due e Source wipe due e New hardware found LS
76. dations on shutter check intervals Continuous Level with HART Technical Reference Manual 105 Appendix Initial factory setup Record shut chk Use the Record shutter check feature to record the date and time when you perform a shutter check This resets the diagnostic alarm shutter check due For more information see the Diagnostics and Repair chapter Next wipe Shut due Use the Next wipe and Shutter check due features to view or enter the due date for the next source wipe and shutter check For more information see the Diagnostics and Repair chapter Tag The tag is a unique eight digit identifier for instrument If provided at order this parameter is entered at Ohmart factory prior to shipment Otherwise the user may enter it on this screen Setting the tag identifier Procedure 40 Setting the tag identifier 1 From the Main menu select Initial setup 2 From the Initial setup menu select System parameters 3 From the System parameters menu select Tag 4 In the Tag screen enter the eight digit identifier for the instrument 5 Press F4 to enter 6 Press F2 to send the updated parameters to the transmitter 106 Continuous Level with HART Technical Reference Manual Appendix Initial factory setup System information Message Use this text field to record information or messages For example this is where you can record a message to operators or notes about the gauge Procedure 41 Setting the sy
77. dure 24 Checking equipment version and serial numbers 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns screen select Other advanced 3 From the Other advanced screen select one of the following e Sensor voltage e Poll addr e Firmware ver e Hardware ver e CPU Serial No e Sensor Serial No e View Temp coefs 68 Continuous Level with HART Technical Reference Manual Advanced functions Select gauge type Ohmart s nuclear density gauges use much of the hardware and software of the Ohmart HART Level transmitters If your level transmitter indicates PV or Density as the process variable it was set incorrectly for a level type application Select gage type enables the users to set the software to operate as either a density or a level gage Procedure 25 Select gage type 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu choose Select gage type 3 From the Select gage type menu select Level 4 If using a HART hand held communication device press F2 to send Select gauge location The local gauge refers to a gauge that has its sensor electronics and processing electronics all contained in the same housing Set a gauge to remote if the sensor electronics and processing electronics are in separate housings and the process signal connects to the auxiliary input of the processing electronics If you are using a Remote HART Processor refer to Remote retrofit on page 149 for m
78. e 5V Memory Corruption HART 30V CPU Active Auxiliary High Voltage Relay amp Field Strength e Power specifications change to 115 VAC or 230 VAC if an internal heater kit is used For more information see page 142 Continuous Level with HART Technical Reference Manual 7 Introduction Typical applications Ohmart level gauges accurately indicate the level of liquids or bulk materials throughout a range on vessels reactors or tanks In order to achieve a level indication over the desired length it may be necessary to use more than one detector The manner in which these multiple detectors link together depends upon the types of detectors used Specific details on using multiple detectors are available in Appendix II Special Applications The accuracy of quality control systems that use Ohmart nuclear level gauges is profitable to a wide range of industry operations A number of applications that use a level gauge are Pulp and Paper e Liquors e Bleach plant chemicals e Coating chemical storage e Lime mud e Wastewater treatment tanks Chemical e pressure low vapor chemical storage e Settlers e Surge tanks Food and beverage e Food slurries Pastes e Syrups e Dough level e Intermediate batch storage Water and wastewater Settling aeration tanks e Clarifiers e Sludge holding tanks e Wet wells 8 Continuous Level with HART Technical Reference Manual Introduction Where t
79. e linearity and Calculate calibration See pages 48 and 49 Continuous Level with HART Technical Reference Manual Appendix Il Special applications Vapor pressure compensation A nuclear level gauge works on the principle that the product shields the detector from the radiation beam allowing more or less radiation to strike the detector as the product level falls and rises For an accurate level indication the variation in the detector output should depend only on the product level However vapor pressure variations in the headspace of the vessel can cause erroneous product level indications This is because the vapor also blocks some of the radiation When the pressure is higher more radiation is blocked when the vapor pressure is lower less is blocked Therefore even at the same product level the detector can receive varying amounts of radiation depending on the head vapor pressure You can compensate for this by using a point detector model DSTH to separately measure the radiation passing through the vapor space This detector signal and the signal from the continuous level detector combine to eliminate the effect of the vapor pressure on the level indication Figure 39 Vapor compensation system Continuous Level with HART Technical Reference Manual 135 Appendix Il Special applications Installation requirements A vapor compensation system requires two detectors the point detector model DSTH to measure the vapor
80. e Calibrations menu select Initial cal 3 From the Initial cal menu select Two point cal 4 From the Two point cal menu select Set Cal high level 5 The prompt Set Process To High Calibration Point Take Data displays Select Yes to allow the data collection to take place The on screen counter displays the time left If necessary press F3 to discontinue data collection 6 After data collection the screen prompts you to input the actual value in engineering units The prompt Input Actual Value displays Enter the actual level in engineering units T If using a hand held communicator press F2 to send the calibration setting to the level transmitter Continuous Level with HART Technical Reference Manual 46 Calibration Step 3 Collecting linearizer table data Note The simple method of initial calibration does not use this step This step allows you to collect data points between the high and the low calibration points so that the Ohmart level transmitter calculates a response curve based on your data Note Ohmart View PC Software users The linearizer data collection procedure is significantly different in View Refer to the Ohmart View User Manual for instructions to collect linearizer data Before collecting the linearizer table data Prepare to set the level and take data Ten levels including the Cal low and Cal high levels are the maximum Prepare to enter the levels into the transmit
81. e Manual Installation Mounting the measuring assembly The level detector has two sets of mounting tab brackets provided by Ohmart that bolt onto the brackets securely welded to the vessel or in some cases nearby structure Note The detector active area where it is possible to make a level measurement is between the mounting brackets Mount the detector so that the lower and upper brackets span the desired measurement length Note The handle on the source holder operates a rotating shutter When installing or removing the assembly from the pipe you must turn the handle to the closed or Off position and lock the handle with the combination lock that Ohmart provides Wiring the equipment A detailed interconnect drawing for the transmitter is available from Ohmart Note If the instructions on the drawing differ from the instructions in this manual use the drawing It may contain special instructions specific to your order Use the drawing notes and the steps that follow to make the input and output connections Make the connections at the removable terminal strips mounted on the CPU board Access the CPU board by removing the explosion proof housing cap Note Not all connections are required for operation See the table on page 24 Continuous Level with HART Technical Reference Manual 23 Installation 24 Termina N Oa NON ON a nn NIA C O BN QA WN o
82. e Shields the radiation elsewhere e model chosen for each particular system depends on the source capsule inside and the radiation specification requirements shutter on the source holder either completely shields the radiation source off or allows it to pass through the process source on Continuous Level with HART Technical Reference Manual 11 Introduction The source holder model chosen for each particular system depends on the source capsule enclosed and the radiation specifications required A shutter on the source holder can either completely shield the radiation source off or allow it to pass through the process source on Shutter On Off Source Tag Collimated Radiation Beam Figure 4 Typical source holder 12 Continuous Level with HART Technical Reference Manual Introduction Scintillator model LSTH The following statements describe the functions of the LSTH detector assembly e Mounts opposite the source holder e Inside the housing is a scintillation material scintillation material produces light in proportion to the intensity of its exposure to radiation photomultiplier tube detects the scintillator s light and converts it into voltage pulses e The microprocessor receives these voltage pulses after amplification and conditioning by the photomultiplier tube e The microprocessor and associated electronics convert the pulses into a calibratable output Expl
83. e transmitter 98 Continuous Level with HART Technical Reference Manual Appendix Initial factory setup Filtering This feature enables change to the response time of the system by increasing or decreasing the averaging time that is used to filter the noise in the signal An increased time for averaging enables the accumulation of a greater number of readings and therefore produces a greater statistical accuracy However this is at the expense of response time to changes in the process Type RC exponential or rectangular window The level transmitter offers a choice of signal filters RC exponential or rectangular window The level transmitter has a sample rate of about 1 sample second but process variables generally change measurably on the order of minutes Electrical and source noise occur on the order of seconds so they can be filtered out with a low pass filter leaving only the change in the process variable in the signal RC exponential RC exponential filtering simulates the traditional Resistance Capacitance filtering It provides an infinite impulse in which all of the previous samples contribute less and less to the average but all contribute somewhat The most recent samples are weighted most heavily in computing the average Compared to rectangular window filtering RC exponential filtering provides a quicker response to step changes in the process but has a larger noise band E Damping 50 5 See aS
84. either a universal hand held terminal or a personal computer with a HART modem and Ohmart software Bench testing enables you to check the following e Power e Communication e Initial setup software parameters Some diagnostics 250 to 1000 ohm Transmitter load resistor terminals 889 mini clips Ht Transmitter test points EN A RS 232 cable PC running Ohmart View Figure 11 Bench test setup Note You may need to reset the time and date if the transmitter has not had power for over 28 days The Real Time Clock Fail message may display It is important to enter the correct time and date because the clock is the basis for source decay calculations For instructions to set the time and date see page 104 Many users choose to calibrate the current loop output on the bench before mounting the detector on the process Refer to page 32 for further information on calibration of the current loop Continuous Level with HART Technical Reference Manual 20 Installation Location considerations At the time you ordered the level transmitter Ohmart sized the source for optimal performance Notify Ohmart prior to installation of the gauge if the location of the gauge is different from the original order location Proper location of the level gauge can sometimes mean the difference between satisfactory and unsatisfactory operation Note Try to locate the source holder in such a place that process material will no
85. ems when external radiographic sources are in the area for vessel inspections summary of the alarm type outputs is in the table below Table 12 Alarm type outputs Gauge status Option to trigger Display HART Current loop and gauge Alarm type relay message output affected history Diagnostic Yes Optional No Yes Analog No No Yes No Process Yes No No No X ray Yes No Yes No Continuous Level with HART Technical Reference Manual 71 Diagnostics and repair Gauge status Use the Gauge Status screens under the Main menu to check status and historical information Diagnostic alarms and HART messages Diagnostic conditions that are currently in alarm alert the user by three possible means 1 Diagnostics screens in the Gauge status menu 2 HART messages that appear when a HART device connects if the diagnostic condition is set to On in the Initial setup screens 3 Relay output if it is set as a diagnostic alarm relay and if the diagnostic condition is set to On in the Initial setup screens Note Refer to the table on page 74 for a summary of all diagnostic alarm conditions and recommended actions Gauge status diagnostics screens To check the status of the system you can use the Diagnostics screen from the Gauge status menu to scroll through a series of checks This screen indicates only the status historical occurrences are stored in the Diagnostic history screens from the Gauge status View history menus Some condition
86. entral agitator the source holder and detector can mount to the vessel on an arc other than a diameter so that the beam of radiation does not cross the agitator You can also avoid other obstructions this way Continuous Level with HART Technical Reference Manual 21 Installation Avoid external obstructions Any material in the path of the radiation can affect the measurement Some materials that are present when the gauge initially calibrates pose no problem because the calibration accounts for their effect Examples of these materials are e Tank walls e Liners e Insulation However when the materials change or you introduce new ones the gauge reading can be erroneous Examples of these situations are e Insulation that you add after calibration absorbs the radiation and causes the gauge to erroneously read upscale e Rapidly changing tank conditions due to material buildup Regular standardizations compensate for slowly changing tank conditions due to material buildup See the Calibration chapter for information on standardization Avoid source cross talk When multiple adjacent pipes or vessels have nuclear gauges you must consider the orientation of the source beams so that each detector senses radiation only from its appropriate source The best orientation in this case is for the source holders to be on the inside with radiation beams pointing away from each other 22 Continuous Level with HART Technical Referenc
87. erform a data collect of the primary sensor e From the Main menu select Calibrations From the Calibrations menu select Data collect e Record the value of the counts from the primary data collect From the Main menu select Initial setup From the Initial setup menu select Auxiliary input From the Auxiliary input menu select NORM From the NORM menu select Aux data collect At the prompt select Yes to take data Record the value of the counts from the Auxiliary data collect From the NORM compensation screen select Gain Adjust the gain value as follows e Compare the counts from the primary and auxiliary data collects e Ifthe auxiliary channel data collect counts are higher than the primary sensor data collect counts adjust the NORM compensation gain down Select Yes to accept the counts and press F4 to enter e Ifthe auxiliary counts are lower than the primary counts adjust the NORM compensation gain up Repeat the auxiliary data collect and gain adjustment steps until the auxiliary channel counts are within 10 of the primary sensor counts If using a hand held HART communicator press F2 to send the settings to the transmitter Follow the procedures for performing a Two point calibration and linearizer curve from the Calibration chapter of this manual These procedures require changing the product level from minimum to maximum and collecting data Complete the linearization and calibration with the procedures Calculat
88. es accept a lock and there is no lock on it The lock is not secured You are unable to secure the lock The operating handle does not properly move into the off position 2 Continuous Level with HART Technical Reference Manual Introduction Storing the equipment Storing the source holder If it is necessary to store the source holder do so in a clean dry area Be sure the source holder shutter is in the OFF or CLOSED position Check the current local regulations U S NRC Agreement State or other to determine if this area must have any restrictions Storing the detector Avoid storage at temperatures below freezing Store the detector indoors in an area that has temperature control between 50 F and 95 F 10 C and 35 C and less than 50 relative humidity Store equipment in dry conditions until installation Continuous Level with HART Technical Reference Manual 3 Introduction LSTH specifications 4 Continuous Level with HART Technical Reference Manual System Accuracy Active Lengths Typical Sources Power Requirements Signal Cable Housing Current Loop Output Relay Output HART Communication Serial Communication Auxiliary Input Capability Electronics Diagnostics Introduction Table 3 LSTH specifications 1 of span typical Model LSTH Cesium 137 Cobalt 60 AC DC Wire size Maximum length HART signal 4 Wire hookup with DC Certification to CSA and UL standards CENEL
89. evel values are input in the Initial setup screens A graph of percent count range vs percent process span indicates the non linearity of the radiation transmission measurement If using a table linearizer the values in the table are percent count range and percent process span counts range 210 30 process span Continuous Level with HART Technical Reference Manual 53 Advanced functions Figure 20 counts range vs process span Raw level Raw level displays the level in inches without the time constant or rectangular window filter Uncomp Lvl Uncompensated level displays the level in inches without the time constant or rectangular window filter Level Level displays the process value that is the level or other indication in engineering units after applying the filter This value relates to the current loop output Process variables The display values for the Process variables screen are Counts low Displays the counts low that is the temperature and sensor uniformity gain compensated counts from the sensor at the Cal low level Determination of the Cal low level occurs during the initial calibration procedure Counts high Displays the counts high that is the temperature and sensor uniformity gain compensated counts from the sensor at the Cal high level Determination of the Cal high level occurs during the initial calibration procedure Max level Displays the maximum level that is the v
90. evel with HART Technical Reference Manual Appendix Special applications This chapter provides application specific information for special installations If your application is not in this chapter you may find application specific information on the certified drawings The certified drawings are in the special information pocket in this manual If you have other application questions contact Ohmart Field Service in the U S or Canada at 513 272 0131 or your local rep outside of the U S or Canada Note To use the compensation features of the HART gauge you must be using Ohmart View 2 0 or higher or have a HART hand held communicator programmed with the OHMART COMP device description Multiple detectors summation Some applications require a measurement length longer than the maximum level transmitter detector length Hand held terminal or PC 7 4 20 mA current loop Level transmitter with HART output Frequency output to HART transmitter Level gauge with frequency output Figure 32 Multiple detectors summation Continuous Level with HART Technical Reference Manual 119 Appendix Il Special applications Special drawings from Ohmart Identification of applications that require multiple detectors occurs at the time of order The end user engineering contractor or both receive certified drawings for the exact equipment ordered Refer to the drawings along with this section of the manu
91. ew CPU board has been installed Procedure 11 New Hardware Found message with new CPU board 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu select New hardware 3 From the New hardware menu select New CPU board 4 The prompt Verify New CPU Board Installed displays Select Yes to allow new backups on the EEPROMs or select to cancel If a new sensor assembly has been installed Procedure 12 New Hardware Found message with new sensor 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu select New hardware 3 From the New hardware menu select New Sensor 4 The prompt Verify New Sensor Installed displays Select Yes to allow new backups on EEPROMs or select No to cancel Proper response to New hardware found message if new hardware HAS NOT been installed CPU EEPROM Corrupt message Sensor EEPROM Corrupt message If there has not been an installation of a new CPU board or sensor assembly and the error message New Hardware Found displays then one of the EEPROMs is probably corrupt You normally can repair the corruption with the EEPROM backup This message will never appear on systems with ion chambers models LNTH and LJTH CAUTION If you suspect that an EEPROM is corrupt we recommend you call Ohmart Field Service for advice before performing the following procedure 58 Continuous Level with HART Technical Reference Manual Advanced functions To rep
92. for Figure 35 1 Voltage input to each detector is 115 or 230VAC 10 50 or 60Hz at 60VA maximum power consumption AC power does not share with transient producing loads Requires an individual AC lighting circuit Supply a separate earth ground Use 14 22AWG wire Maximum length of shielded 2 conductor 18AWG cable is 1 000m 3 280 ft For indoor or conduit use use Ohmart part number 202676 For outdoor use in cable trays or Class 1 Division 2 hazardous areas use cable part number 202679 Standard output signal is 4 20 into 250 1 000 ohms 1 8 is positive and P1 9 is negative HART communication protocol based on Bel 202 FSK standard is available on these connections Output isolates to standard ISA 50 1 Type 4 Class U Hart Hand held terminal connects across 4 20mA wires to communicate with transmitter Use terminal number 236907 Rosemount Model 275 or equivalent Hand held terminal can connect across 4 20mA wires at any point HART modem connects across 4 20mA wires to allow communication between transmitter and an IBM compatible PC Relay contacts rates are 10A at 240VAC or 8A at 24VDC Attach 18 AWG green wire with closed lug terminal to housing using 10 32 x screw If using the optional CENELEC external ground connect earth ground to outside of housing instead of to PI Pin 3 Continuous Level with HART Technical Reference Manual 125 Appendix Il Special applications NAL CENELEC JUND
93. gh level steps in any sequence in Initial cal screens Collect linearizer data on known samples using the function Collect data point in the Linearizer screens Perform Calc linearity function in the Linearizer screens Perform Cal result function in Initial cal screens Figure 14 Standard method calibration flow chart Continuous Level with HART Technical Reference Manual 34 Calibration Table 9 Standard method calibration Standard method calibration Step in flow chart Manual heading Page Check process engineering units Units 96 Check process span Span settings process span 101 Check linearizer type set to table non linear Choosing the linearizer type 37 Check the repeatability of measurement Checking the gauge repeatability 42 Perform Set Cal low level and Step 1 Set low level 45 Set Cal high level Step 2 Set high level 46 Collect linearizer data on known samples Step 3 Collecting linearizer table data 46 Perform Calc linearity Step 4 Calculating the linearity 48 Perform Cal result Step 5 Calculate calibration 48 Continuous Level with HART Technical Reference Manual 35 Calibration Simple method of calibration Figure 15 illustrates the steps to prepare for and perform a simple method calibration Are process units set correctly Change units in Initial setup screens Is linearizer set to Table linear Change lineari
94. gnostics check 76 serial numbers 68 shutter check alarm setup 111 frequency 88 recording when complete 88 setting the interval 107 shutter check due alarm acknowledge 76 Shutter check due diagnostics check 76 in diagnostic history 79 Shutter check interval 107 Smart Pro transferring data from 145 Source decay gain displayed in process chain 55 source holder 12 source holder lock 28 Source type 107 source wipe alarm setup 111 frequency 88 recording when complete 88 setting the interval 107 source wipe due alarm acknowledge 76 diagnostics check 76 in diagnostic history 79 span current loop analog output 105 process 104 setup 104 with multiple detectors 129 spare parts 90 frequency output detectors 123 specifications heater kit changes 144 LJTH 6 LNTH 7 Continuous Level with HART Technical Reference Manual 177 Index LSTH 4 RHP 152 standardize due alarm acknowledge 76 alarm setup 111 diagnostics check 76 in diagnostic history 79 standardize gain 51 Standardize gain displayed in process chain 56 Standardize interval 100 Status Error 61 Stdz standardize counts 54 storage 3 summation mode setup 119 System parameters 106 T Tag 108 TC temperature compensated counts 53 Temp sensor temperature 53 Temp comp gain 55 temperature coefficients 68 Temperature test mode 67 Test modes 61 Threshold 115 alarm setup 116 Time
95. h the Main menu Advanced Fxns menu e From the Main menu select Advanced Fxns e From the Advanced Fxns menu select New hardware e From the New hardware select New CPU board e Atthe prompt select Yes to verify that the new CPU board is installed The software automatically performs the appropriate backups with the new CPU board and the existing sensor After checking the new CPU board place the detector assembly back into the pipe housing Secure the mounting bracket to the inside of the housing with the bolt e Replace the pipe Return the source holder shutter to the ON position to establish a radiation field and resume normal operation of the level transmitter Continuous Level with HART Technical Reference Manual Diagnostics and repair Requesting field service To request field service within the U S and Canada call 513 272 0131 from 8 00 A M to 5 00 P M Monday through Friday For emergency service after hours call 513 272 0131 and follow the voice mail instructions Returning equipment for repair to Ohmart When calling Ohmart to arrange repair service have the following information available Product model that is being returned for repair Description of the problem Ohmart Customer Order C O Number Purchase order number for the repair service Shipping address Billing address Date needed Method of shipment Tax information Continuous Level with
96. he current loop mA output in response to a marked increase in radiation field It can also trigger the output relay if set up to do so When the gauge detects a radiation field above a set threshold as a percentage of the cal low counts value it sets the current loop output at its value 10 seconds before the detection of the x ray interference It periodically dithers the output about the average cycling until the radiation field is back to the normal level or until a time out period of 60 minutes See the following figure for a diagram of the current loop output in x ray interference mode current loo output mA output 10s before Dither level 1 3 1 1 Dither time gt i Cycle period i Figure 31 X ray interference alarm output In the Initial setup screens you can adjust the parameters shown in Figure 31 The parameters are Threshold Threshold is the percentage beyond the calibration low counts that triggers x ray interference suppression Default value 1 Dither level Dither level is the magnitude in mA above and below the average output of the current loop dithering Default value 1mA Cycle period Cycle period is the repetition rate for presenting the current loop dither in x ray interference output mode Default value 1s Continuous Level with HART Technical Reference Manual 113 Appendix Initial factory setup Dither time Dither time is the percen
97. he following e Key usage e Data entry e Equipment interface 16 Continuous Level with HART Technical Reference Manual Introduction In order to effectively use the features in Ohmart s level gauge you must use Ohmart s device description DD to program the HART communicator You may purchase a universal hand held terminal programmed with the device through Ohmart Ohmart part number 236907 Use firmware 2 02C or higher when you use the hand held HART communicator to make NORM or vapor compensation See Appendix Il Special Applications for further information concerning NORM and vapor compensation Using Ohmart View Software on a PC When you use an IBM compatible personal computer to communicate with the LSTH LJTH LNTH or other Ohmart HART transmitter field device you must have a HART modem and Ohmart View software The Ohmart View software kit part number 237857 includes the following e Modem e Cables e Software e Manual Ohmart View software is a DOS program that emulates the HART Communicator Model 275 In addition Ohmart View enables the following e Charts the 4 20 current output graphically e Stores and retrieves configuration data to disk e Off line editing of configurations Continuous Level with HART Technical Reference Manual 17 Introduction Figure 9 View software Note There are some minor differences in operation of the Ohmart View software and the hand held communicator
98. heck power supply Check power input terminals 1 2 Check software diagnostics Call Ohmart Field Service Check HART device connection on loop and HART device functioning Check loop wiring and jumpers J5 J6 Replace CPU board Check power input Replace CPU board Check auxiliary input wiring terminals 21 amp 22 with a meter for frequency signal Check auxiliary input equipment Call Ohmart Field Service Check against relay output terminals 12 13 and 14 If no relay output replace CPU board A 1 mR hr 2 580nC kg hr field is usually required for a measurement Check for closed source shutter buildup and insulation Continuous Level with HART Technical Reference Manual Diagnostics and repair Troubleshooting The following flow charts may be useful to determine the source of a problem They cover these topics e HART communication problems e Level transmitter not responding e Measurement not correct Hardware troubleshooting is available at the board not the component level Essentially only the following three hardware components are field replaceable e CPU board e Sensor assembly e AC power supply board The trouble shooting flow charts refer to the following diagrams to track the power distribution on the level transmitter system CN2 blue black blue white white black red white black white green 24V DC ret red b
99. ical Reference Manual 41 Calibration Choosing a linearizer method Procedure 2 Choosing a linearizer method 1 From the Online menu select Main menu 2 From the Main menu select Calibrations 3 From the Calibrations menu select Linearizer 4 From the Linearizer menu choose Select linearizer 5 On the Select linearizer screen the currently used linearizer is displayed on the second line 6 From the Select linearizer screen select either e Table non linear e Table linear T Press F4 to enter Refer to Appendix III for further instructions if you choose the Table linear option Checking the gauge repeatability Check the level transmitter measurement repeatability before performing the calibration Access the Data collect function in the Data Collect screen from the Calibrations menu to enable simple measurement of the process without altering the calibration or standardization values It enables the system to measure the process and report the number of sensor counts For more information about counts and the calculations performed to produce the final process value see the Process Chain section in the Advanced Functions chapter You can perform a data collect three or four times on the same level to check the repeatability of the sensor If the sensor counts vary widely you should increase the Data collection interval parameter from the Initial setup menu Process parameters menu Data coll interval screen
100. iltering parameters to the transmitter Continuous Level with HART Technical Reference Manual 101 Appendix Initial factory setup Span settings The spans for the process current loop and any optional auxiliary input are set in the Spans screen from the Initial setup Process parameters menus Process span Process span is the anticipated lowest and highest level Min and Max level measurement with the gauge The level transmitter calibrates within these settings These define the endpoints for the calibration and linearizer curve This does not define the span for the output current loop Refer to the Current Loop Span procedure in this section Note The Min and Max Level values for the process span are essential to proper calibration of the system You must enter the Min and Max level for process span before you perform an initial calibration You must perform a new initial calibration procedure if the values for the process span Min or Max levels change Modify the span setting if the level transmitter moves from its intended location or is measuring on a different span It is a good practice to verify that the setting is correct before performing an initial calibration Setting process span Procedure 36 Setting the process span 1 From the Main menu select Initial setup 2 From the Initial setup menu select Process parameters 3 From the Process parameters menu select Spans 4 From the Spans menu select P
101. independently measured or known level The frequency of standardization depends on several factors including desired accuracy of the reading During the standardization procedure the system displays either e default value for the standardization condition e prompt to enter the actual level of the standardization condition The Initial factory setup appendix details how to set up the software for either prompt Automatic standardization reminder If you enable the standardization due alarm the level transmitter alarms when standardization is due The standardize interval is programmed into the calibration parameters setup Refer to Appendix Initial Factory Setup for details on the following subjects e Output relay setup e Standardization due alarm e Standardization interval Continuous Level with HART Technical Reference Manual 50 Calibration Performing a standardization Standardizing the gauge Procedure 9 Standardizing the gauge 1 From the Main menu select Calibrations 2 From the Calibrations menu select Process stdz 3 The Process stdz screen prompts if you want to take data Select Yes if you are ready with the standardization material in the process vessel to continue the standardization procedure The timer counts down while it is collecting data 4 Depending on how the system is set up it displays one of the following e The message Gage Set up to Use Default Value indicates the system is using
102. istory 79 RAM status diagnostics check 76 Raw counts 53 Real time clock fail alarm acknowledge 76 alarm setup 111 in diagnostic history 79 Real time clock test diagnostics check 76 Record shutter check 108 Record wipe 107 Relay 113 Relay action limit High limit alarm setup 113 Relay action limit Low limit alarm setup 113 relay settings diagnostic alarm 112 process alarm 114 x ray alarm 117 Relay test mode 66 Remote HART Processor 70 151 software settings 153 repairs material return authorization MRA number 96 returning equipment to Ohmart 95 retrofit integral 149 remote 151 RHP 151 SD source decay counts 54 Select gage location 70 Select Gage Location 70 153 Select gage type 70 Select Gage Type 153 Select gauge type 70 Sensor counts 53 Sensor EEPROM corrupt 60 alarm acknowledge 76 alarm setup 111 in diagnostic history 79 Sensor EEPROM status diagnostics check 76 sensor fail in diagnostic history 79 Sensor fail Index alarm acknowledge 76 alarm setup 111 Sensor high voltage fail alarm acknowledge 76 alarm setup 111 Sensor serial number 68 Sensor status diagnostics check 76 sensor temp probe alarm acknowledge 76 Sensor temp probe test diagnostics check 76 sensor temperature alarm setup 111 in diagnostic history 79 Sensor test mode 63 sensor voltage 68 Sensor voltage out of spec in diagnostic history 79 Sensor voltage status dia
103. itions On or Off in the Diagnostic alarm screens from the Initial setup Alarms Mode configuration menus When a HART device initially connects to the level transmitter any conditions in alarm display on the screen Continuous Level with HART Technical Reference Manual 73 Diagnostics and repair Summary of diagnostic alarm conditions Table 13 Diagnostic alarm conditions Diagnostic check on Gauge status screen RAM status Sensor EEPROM status LSTH only Real time clock test Sensor temp probe test LSTH only Standardize due Source wipe due CPU EEPROM status Alarm type 1 Alarm type 2 Shutter check due New hardware found LSTH only Sensor status Process out of range Sensor voltage status LSTH only 74 Normal Error condition 5 Pass Fail Pass Fail Pass Fail Pass Fail Yes Yes Pass Fail Not used Not used Yes Yes Pass Fail Yes Pass Fail HART message RAM corrupt Sensor EEPROM corrupt Real time clock fail Sensor temp probe fail Standardize due Source wipe due CPU EEPROM corrupt Shutter check due New hardware found Sensor fail Process out of measurement range Sensor high voltage fail Alarm acknowledgment Recommended action RAM memory corruption has occurred and has been resolved internally Repeated triggering of this alarm indicates a possible ha
104. ix Retrofitting HART electronics Use the following table to record data from the Smart Pro Table 32 Smart Pro data record Corresponding Smart Pro parameter Smart Pro screen item Value HART parameter Standardize parameter 520 25 Standardize parameter 520 26 Process low value Low sample input 520 32 Cal low level Process high value High sample input 520 33 Cal high level Cal low counts 520 39 Counts low Cal high counts 520 40 Counts high Time constant 527 0 Filter Fast response filter chrontrol 527 1 Threshold Span 527 2 N A Output min 527 10 4mA level Output max 527 11 20mA level Linearizer curve On Off 528 41 N A Low product value 528 42 Min level High product value 528 43 level Use Table 33 to record linearizer table information Transferring this information makes new initial calibration procedure unnecessary If you prefer to do a new initial calibration refer to the Calibration chapter of this manual for instructions To calculate the new value to enter into the HART version linearizer table divide the Smart Pro value of each point by 100 For example if the Smart Pro value of point 2 is 630 enter 6 30 as the corresponding HART 5 0 point 144 Continuous Level with HART Technical Reference Manual Appendix Retrofitting HART electronics Table 33 Linearizer record Linearize r table Smart Pro HART Linearizer HART Linearizer table points Screen item Smart Pro Value table point
105. l software calculates a straight line between the Min Level and Max Level Cal Low Counts Standard Ss Raw Sensor Counts Cal High Counts Max Min Level Level Cal Cal Low High Level Level Actual Level eng units Figure 17 Raw counts vs actual level with linearizers Standard calibration method The linearizer curve maps on two axes so that it indicates Count Range vs Span as shown in Figure 18 To construct the linearizer table a data point calculates for every 2 5 of the span View or edit these points in the Linearizer table screen Simple calibration method The internal software calculates a straight line between the Min Level and Max Level based on the Cal Low Level and Cal High Level Continuous Level with HART Technical Reference Manual 39 Calibration 100 Standard Count Range 0 0 100 Span Figure 18 Count range vs 96span shown in linearizer table Both calibration methods Figure 19 illustrates the effect on the final output of using the non linear table vs the linear table for the linearizer Using the non linear table linearizer in the standard method produces a linear output Using the linear table linearizer table produces a non linear output 7 Standard Indicated Level Min Level Min Level Actual Max Level Level Figure 19 Indicated level vs actual level Continuous Level with HART Technical Reference Manual 40 Calibration Choo
106. lable on these connections Output isolates to standard ISA 50 1 Type 4 Class U Hart Hand held terminal connects across 4 20mA wires to communicate with transmitter Use terminal number 236907 Rosemount Model 275 or equivalent Hand held terminal can connect across 4 20mA wires at any point HART modem connects across 4 20mA wires to allow communication between transmitter and an IBM compatible PC Relay contacts rates are 10A at 240 VAC or 8A at 24VDC Attach 18AWG green wire with closed lug terminal to housing using 10 32 x screw If using the optional CENELEC external ground connect earth ground to outside of housing Continuous Level with HART Technical Reference Manual 123 Appendix Il Special applications OCA TION CONTROL ROOM HOUSING GROUND WIRED FOR O DPC SYSTEM ARCHITECTURE LJTH OR LNTH DET OPTIONAL MODEM LM NOTE 5 OUTPUT SIGNAL n mA INPUT EARTH NEUTRAL AND HELD TERMINAL TERMINAL 5 TO CIRCUIT BOA RELAY SEE NOTE 6 Figure 34 Interconnect LJC or LN with LJTH or LNTH 124 Continuous Level with HART Technical Reference Manual Appendix Il Special applications Interconnect for models with CPU board freq output to HART Notes
107. lack red 24V DC Power supply board orange black green white black white blue a a o CN3 red 5V orange 5V white AC 30V O O FIELD black AC MEM L1 L2 COM CPU cable to sensor User s power Figure 24 Power intraconnect diagram LSTH Continuous Level with HART Technical Reference Manual 81 Diagnostics and repair D shell connector top of DF amplifier housing NEN T ITTTTT d di 21 5 pre rower supply CTC Power a Supply ens nee gt it Et a 5 E 5 Di 5 Sane L A a o 5 gt Distribution terminal i block 4 i m M 8 CPU board 32 526 28 t g Figure 25 Intraconnect for LNTH LJTH 82 Continuous Level with HART Technical Reference Manual Communication problem flowchar
108. lculate a new calibration linearizer table The Calc linearity function initiates this calculation You must perform this step before the Calculate Calibration step described in the next section Calculating a new linearizer table Calculate the linearizer after you perform the following steps e Select non linear table for the linearizer curve e Collect linearizer data Procedure 7 Calculating the linearizer 1 From the Main menu select Calibrations 2 From the Calibrations menu select Linearizer 3 From the Linearizer menu select Linearizer data 4 From the Linearizer data menu select Linear data collect 5 From the Linear data collect menu select Calc linearity 6 At the prompt select Yes to proceed with the linearity calculation The linearizer table calculates based on the level values 7 Press F2 to save Continuous Level with HART Technical Reference Manual 48 Calibration Step 5 Calculate calibration After collecting the high and low level calibration data and calculating the linearity the level transmitter is ready to make the calibration calculation Calculating the calibration result Procedure 8 Calculating the calibration result 1 From the Main menu select Calibrations 2 From the Calibrations menu select Initial cal 3 From the Initial cal menu select Two point cal 4 From the Two point cal menu select Cal result 5 The screens display the results of the cal low and cal high sensor counts
109. log alarm setup The analog alarm uses the current loop analog output to signify that the sensor is outputting zero counts In this case the analog output sets to either 2mA or 22mA and no longer tracks the process level The user can choose the 2mA or the 22mA setting for the analog alarm Table 23 Analog alarm conditions Alarm out 22mA Alarm out 2mA Setting the analog alarm output Procedure 45 Setting the analog alarm output 1 From the Main menu select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu select Mode configuration 4 From the Mode configuration menu select Analog alarm 5 From the Analog alarm menu select Alarm output 6 From the Alarm output menu select either 22mA 2 7 Press 4 to enter 8 If using a hand held HART communicator press F2 to send the change to the transmitter Process alarm setup Use the process alarm setup to make the relay output a high or low process alarm For a low limit a process level below a set point energizes the relay for a high limit a process level above a set point energizes the relay Process alarms only work in conjunction with the output relay No HART messages post that relate to the process alarm You cannot use a relay as a diagnostic or x ray alarm if you have set it as a process alarm Table 24 Process relay set alarm conditions Relay action limit High limit Relay action limit Low limit Relay setpoint
110. m 6 At the prompt select Yes to take data When data collection is complete select Yes to save the vapor pressure reference counts T If using a hand held HART Communicator press F2 to send the settings to the transmitter 8 Return to the Main menu 9 Follow the procedures for performing a Two point calibration and linearizer curve from the Calibration chapter of this manual e These procedures require changing the product level from minimum to maximum and collecting data During the calibration and linearization procedure maintain the reference pressure in the headspace 10 Complete the linearization and calibration with the procedures Calculate linearity and Calculate calibration See pages 48 and 49 11 Set the product to the lowest possible level while at the maximum pressure 140 Continuous Level with HART Technical Reference Manual 12 13 14 15 16 17 18 Appendix Il Special applications Procedure 55 Calibrating with vapor compensation continued Set the vapor density to its highest possible value Note the level indication it will likely be upscale From the Initial setup menu select Auxiliary input From the Auxiliary input menu select Vapor From the Vapor menu select Gain Adjust the vapor compensation gain value until the level indication reads the correct minimum level value Press F2 to send to the transmitter Continuous Level with HART Technical Reference Manual 141
111. meters to the transmitter 104 Continuous Level with HART Technical Reference Manual Appendix Initial factory setup Source type Use the Source type feature to view or enter the isotope in the source holder that produces the radiation signal The Ohmart factory enters this parameter based on information received at the time of the order You can check the isotope type against the source holder label Procedure 39 Setting the source type 1 From the Main menu select Initial setup 2 From the Initial setup menu select System parameters 3 From the System parameters menu select Source type 4 In the Source type screen select one of the following source types Cs 137 60 e 241 e Cf252 No source 5 Press F4 to enter 6 If using a hand held HART communicator press F2 to send the updated parameters to the transmitter Source function Wipe Interval Use the Wipe interval feature to view or enter the interval in days between successive source wipe diagnostic alarms Check with current applicable regulations Record wipe Use the Record wipe feature to record the date and time when you perform a source wipe This resets the diagnostic alarm source wipe due For more information see the Diagnostics and Repair chapter Shut chk Interval Use the Shutter check interval feature to enter the number of days between successive shutter check diagnostic alarms Check with current applicable regulations for recommen
112. mmends a continuous application of power for approximately 12 hours before using the detector Continuous Level with HART Technical Reference Manual 30 Calibration Current loop analog output calibration Calibrating the current loop adjusts the 4 20 output to a reference either the PLC DCS ora certified ammeter It forces the 4mA and 20mA outputs to the external reference The Ohmart factory pre adjusts the current loop with a certified ammeter so it is very close to the outputs required To correlate the 4 20mA to the process value set the span of the current loop output in the Loop Span screen from the Initial setup Process parameters Spans Current Loops Span menu See the Appendix I Initial Factory Setup section for details Note The current loop and process spans are independent and set separately The current loop span sets the level indications for the 4mA and the 20mA outputs The process span sets the endpoints of the calibration curve The current loop span and process span are set in the Initial setup screen from the Main menu A quick way to check the span settings is to use the View settings menu from the Initial setup menu A direct measurement of the current is preferable Take this measurement by hooking the meter up in series with the instrument and the DCS However if you know the resistance of the DCS use a voltage measurement to calculate the current Dcs Current meter Te
113. nce Manual Installation Commissioning the gauge The process of commissioning the gauge includes the following e Taking appropriate radiation field tests e Checking the pre programmed setup parameters e Calibrating on process e Verifying the working of the gauge Ohmart Field Service Engineers typically commission the gauge It is necessary to remove the source holder lock the first time the gauge takes measurements in the field Only persons with a specific license from the U S NRC Agreement State or other appropriate nuclear regulatory body may remove the source holder lock Note Users outside the U S must comply with the appropriate nuclear regulatory body regulations in matters pertaining to licensing and handling the equipment Can you remove the source holder lock If you are in doubt whether you have permission to remove the source holder lock Do not The license sets limits on what the user can do with the gauge Licenses fall into two categories 1 General 2 Specific It is up to the user to review the license to determine if they have the appropriate permission to perform any of the following e Disassemble e Install e Relocate Repair e Test e Unlock You can remove the source lock if installation of the gauge is in the U S and you have the specific license to remove the source holder lock Confirm that your license specifically states that you have the permission to perform this operation
114. ndix describes how to retrofit HART communications capabilities onto an existing continuous level gauge Two types of retrofits are available 1 Integral The HART support electronics mount and wire in the existing level gauge housing 2 Remote The HART support electronics mount in a separate housing A frequency signal from the level detector is input to the HART electronics After upgrading to HART electronics the detector acts as a stand alone transmitter providing a calibrated 4 20 signal from the detector head Preserving information from Smart Pro If you have existing Smart Pro electronics Smart Pro or Smart Pro Pac you can preserve information on setup and calibration from the Smart Pro electronics This information can transfer to the new transmitter electronics saving a great deal of time commissioning the gauge Note Smart 1 and Smart 2 electronics users can preserve the information from their systems and transfer it to the HART electronics We recommend consulting Ohmart Field Service for help on your individual installation Note EDS users cannot transfer information to the HART electronics You must perform new setup and calibration procedures After the new electronics are installed refer to Appendix I Initial Factory Setup to enter the correct parameters Proceed to the Calibration chapter for instructions to calibrate the gauge Continuous Level with HART Technical Reference Manual 143 Append
115. o find help If you need help finding information check the Index and Table of Contents within this manual In addition the gauge has Help screens that you can view using the universal hand held terminal or Ohmart View software These help screens are useful references for definitions of parameters and hints Ohmart Customer Service Ohmart Customer Service has Field Service Engineers located across the U S for on site service to U S and Canada In many cases a Field Service Engineer is at your plant for the start up of your gauge In addition Field Service Engineers regularly assist customers over the phone If you have a question or need help call Customer Service during office hours If your problem is an emergency for example line shut down because of Ohmart equipment you can reach us 24 hours a day Table 6 Contact information Ohmart Phone 513 272 0131 Ohmart FAX 513 272 0133 Ohmart Field Service E mail fieldservice ohmart com In addition Ohmart provides field service for customers outside the U S and Canada Customers outside the U S and Canada can also contact their local Ohmart representative for parts and service When calling with a question if possible please have the following information ready Ohmart Customer Order Number Locate on the engraved label on the source holder Sensor serial number Locate on the sensor housing inside the external housing Continuous
116. oaches the 4 00mA successively Repeat procedure for 20mA setting You can check the current loop output calibration at any time by using the test mode to output a user specified milliamp setting See the section Milliamp Output Test in the manual Continuous Level with HART Technical Reference Manual 32 Calibration Calibration Calibration establishes a reference point or points that relate the detector output to actual or known values of the process You must make a calibration before the gauge can make measurements of any accuracy Perform the calibration after the installation and commission of the gauge at the actual field site You do not need to repeat the calibration procedures as long as certain critical process and equipment conditions remain the same See When a New Calibration May Be Necessary in this manual The gauge requires only a periodic standardization to compensate for changing conditions Choosing the calibration method For each installation the user must choose one of two ways to calibrate the level transmitter The best calibration method depends on how you use the continuous level transmitter Read the following table to decide which method to use Table 8 Calibration methods Standard method Simple method Use the standard method if the gauge is required to Use the simple method if the gauge is only required to repeatable and accurately indicate the level of process be repeata
117. ode 5 At the prompt select Yes to adjust counts 6 Input the Aux counts that you want to force 7 At the prompt select Yes to start test mode and send new data The transmitter continues functioning in auxiliary test mode until it times out after one hour or until you choose Exit Aux test mode Exit auxiliary input test mode Procedure 19 Exit Auxiliary test mode 1 From the Advanced Fxns menu select Test mode 2 From the Test mode menu select Aux Inp test mode 3 From the Aux Inp test mode menu select Exit Aux test mode 4 At the prompt select Yes to exit the test mode 64 Continuous Level with HART Technical Reference Manual Advanced functions Relay test mode Relay test mode enables the user to manually toggle the relay on or off to test the contacts This is useful for verifying the functioning of alarm annunciators Start relay test mode Procedure 20 Start Relay test mode 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu select Test mode 3 From the Test Mode menu select Relay test mode 4 From the Relay test mode menu select Enter mA test mode 5 At the prompt select Energize relay De energize relay The transmitter continues functioning in Relay test mode until it times out after one hour or until you choose Exit relay test Exit relay test mode Procedure 21 Exit Relay test mode 1 From the Advanced Fxns menu select Test mode 2 From the Test mode menu select Rel
118. ol on current loop output PC interface Optional hand held interface Full duplex RS 422 485 port 2 400 baud Type Possible function On board memory Real time clock LED indication Accuracy depends on specific application parameters 12 234 305mm 5 944mm 12 305mm increments 0 66MeV gamma radiation emitter 30 2 year half life 1 2 and 1 3MeV gamma radiation emitter 5 3 year half life 115 230VAC 10 at 50 60Hz at 525VA max power consumption CE compliance requires 24VDC 14 22AWG 1 63 0 643 3 280ft 1 000 18 22 AWG 1 02 0 643 two conductor shielded Designed to meet National Electric Code U S amp Canada Class Groups A B C amp D Division 1 amp 2 Class Il Groups E F amp G Division 1 amp 2 EExd IIC T5 IP 66 4 F 140 F 20 C 60 C option for lower temperatures available water cooling required above 140 60 0 95 non condensing 0 50 at 300cps Carbon Steel others optional Epoxy Powder Coat 50 1 0216 active length in inches 23kg 0 0186kg active length in mm 4 20mA isolated into 250 1 000 Jumper selectable source active or sink passive mode Diagnostic alarm or process high low alarm function 10A at 240VAC or at 24VDC SPDTForm C BEL202 FSK standard HART modem and Ohmart communications software package HART Communicator model 275 hand held terminal with Ohmart device descriptions loaded Not used for
119. omplete The AC power source voltage input is 90 270 at 50 60Hz at 20VA maximum power consumption Do not share AC power with transient producing loads For the LSTH only the DC power source voltage input is 10 30VDC less than 100mV 1 1 000 Hz ripple at 20VA maximum power consumption DC power cable can be part of a single cable 4 wire hookup or can be separate from output signal cable See the Output Current Loop section Note The LSTH can accept either AC or DC input power but not both at the same time Models LJTH and LNTH accept only AC power Use 14 22AWG wire for power wiring to the gauge Switch for CE compliance For CE compliance install a power line switch no more than one meter from the operator control station Output current loop Output signal is 4 20 into 250 10000hms Terminal 1 8 is positive and 1 9 is negative HART communication protocol BEL202 FSK standard is available on these connections The output is isolated to standard ISA 50 1 Type 4 Class U When using signal current loop or 4 20mA output cables that Ohmart did not supply the cables should meet the following specifications e Maximum cable length is 1 000 3 280ft e All wires should be 18 or 22AWG 1 02 0 643mm If using DC power signal and power can run on a single cable 4 wire hookup two wires for power two for 4 20 Communication The HART hand held terminal can connect anywhere across the 4
120. or active length 35 0 o 2 o s 5 o gt E 6 9 gt 25 2 ont Figure 33 Placement of multiple detectors 122 Continuous Level with HART Technical Reference Manual Appendix Il Special applications Detector wiring Multiple detectors application require at a minimum one frequency output detector and only one HART output detector The following table lists some typical combinations Table 29 Typical combinations for detector wiring Frequency output detector HART output detector Interconnect figure LJC LJTH Figure 34 LN LJC LNTH LN LJF LJTH Figure 35 LNF LJF LNTH LNF LSF LSTH Interconnect for models with DPC amplifier freq out to HART Notes for Figure 34 1 Voltage input is 115 or 230VAC 10 50 or 60Hz at 1 050VA maximum power consumption total load for both detectors AC power does not share with transient producing loads Requires an individual AC lighting circuit Supply a separate earth ground Use 14 22AWG wire Maximum length of shielded 2 conductor 18AWG cable is 1 000m 3 280 ft For indoor or conduit use Ohmart part number 202676 For outdoor use in cable trays or Class Division 2 hazardous areas use cable number 202679 Standard output signal is 4 20mA into 250 1 000 ohms 1 8 is positive and P1 9 is negative HART communication protocol based on Bel 202 FSK standard is avai
121. or three typical uses of a frequency input e Summation mode e NORM compensation e Vapor pressure compensation Note Refer to Appendix Special Applications for complete application information on using the following compensation methods e Summation e NORM e Vapor pressure Input filter Input filter is the auxiliary input signal with application of the time constant The filter type RC or rectangular window applied to the auxiliary input is the same as the primary channel Setting the auxiliary input filter Procedure 49 Setting the input filter 1 From the Main menu select Auxiliary input 2 From the Auxiliary input menu select Filter TC 3 In the Filter TC screen input the value for the filter time constant 4 Press F4 to enter 5 If using a hand held HART Communicator press F2 to send the setting to the transmitter 116 Continuous Level with HART Technical Reference Manual Appendix Initial factory setup Summation mode The HART level transmitter can have as an input a raw sensor output from another slave level gauge which cannot be used in the HART current loop The master level transmitter receiving the input uses the incoming signal to modify its output For example you may use this feature to make the master HART level transmitter read the sum of two level gauges Continuous Level with HART Technical Reference Manual 117 Appendix Initial factory setup Notes 118 Continuous L
122. ore information Procedure 26 Select gage location 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu choose Select Gage Locati 3 From the Select Gage Locati menu select either Local or Remote 4 If using a HART hand held communication device press F2 to send Continuous Level with HART Technical Reference Manual 69 Chapter 5 Diagnostics and repair Software diagnostics The level transmitter system can alert users to potential problems by e Posting messages on the HART screens e Energizing the output relay e Distinctly changing the current loop output e Tracking the current status and history in the Gauge status screens Four classes of alarms are available to track the status and history in the Gauge status screens These alarms are 1 Diagnostic 2 Analog 3 Process 4 X ray Diagnostic alarm Provides information about the level transmitter system and alerts the user when periodic procedures are due Analog alarm Sets the current loop mA output to either 2mA or 22mA when the detector outputs zero counts Process alarm The process alarm allows the relay output to trip when the process level is either above high limit or below low limit a setpoint Continuous Level with HART Technical Reference Manual 70 Diagnostics and repair X ray alarm Distinctly changes the current loop mA output in response to a marked increase in the radiation field This prevents control probl
123. ory setup Process stdz type Process standardize type determines how you enter the actual process value of a standardize sample If this is set as Use Lab sample value the software screens prompt entry of the sample value during a standardize If this is set as Use Default value the software always uses the Default standardize level as the sample value Default std Default standardize is the default level value in engineering units that you use in the standardization procedure At standardization enter the actual level of the process material to override this default Stdz interval Standardize interval is the interval in days between standardize alarms The level transmitter alarms to indicate that a standardize procedure is due if the diagnostic alarm Standardize due is toggled on Setting the calibration parameters Procedure 34 Setting the calibration parameters 1 From the Main menu select Initial setup 2 From the Initial setup menu select Process parameters 3 From the Process parameters menu select Cal parameters 4 From the Cal parameters menu select the calibration parameters to view or edit as needed Refer to the help screens F1 or page 97 in this manual for descriptions View or edit the following parameters Data coll interval e Warn cal span e Process stdz type e Default std Stdz interval 5 If using a hand held HART Communicator press F2 to send the updated calibration parameters to th
124. osion Proof Housing ML Power Supply Board Test Points Terminal Blocks LED Indicators Cable Access Notches Conduit Entry Sensor Housing Mounting Bracket Figure 5 LSTH exploded view Continuous Level with HART Technical Reference Manual 13 Introduction lon chamber models LJTH and LNTH Models LJTH and LNTH contain an ion chamber which is a metal tube with a central electrode that extends the length of the tube The electrode and tube are biased with a 15VDC voltage with respect to one another The tube is filled with an inert gas usually argon at 300psig that ionizes when exposed to radiation causing a picoamp current to generate on the electrode in proportion to the intensity of the radiation The current amplifies and converts to a 0 10 2 signal by the DF amplifier This digital signal sends to the microprocessor through the CPU board terminal blocks The microprocessor and associated electronics convert the signal into a calibratable output proportional to the level of liquid in the vessel Explosion Proof Housing lon Chamber Wiring Terminal Blocks Mounting Plate Test Points Interconnect Terminal Blocks LED Indicators Conduit Entry Power Supply Board CTC Temperature Controller Figure 6 LJTH and LNTH exploded view DF amplifier The DF amplifier coverts a very small current picoamp range from the ion chamber to a usable voltage by use of a high megaohm
125. ot responding flowchart part 2 85 RC exponential filtering 99 Rectangular window filtering 100 X ray interference alarm output 113 Multiple detectors summation 119 Placement of multiple detectors 122 Interconnect LJC or LN with LUTH or LNTH 124 Interconnect LUF LNF or LSF with LJTH LNTH or LSTH 126 NORM compensation system 128 Continuous Level with HART Technical Reference Manual ix Figure 37 Placement of detectors for NORM compensation 129 Figure 38 Interconnect LJF LNF LSF with LJTH LNTH LSTH 131 Figure 39 Vapor compensation system 135 Figure 40 Interconnect DSTH with LSF LUC LUF LNC LNF 137 Figure 41 Level system with Remote HART Processor 149 Figure 42 Remote HART Processor interconnect 151 Figure 43 HART screen Transmitter not connected 154 Figure 44 HART screen Online 155 Figure 45 Initial setup 156 Figure 46 Process parameters 157 Figure 47 System parameters 158 Figure 48 Alarms 159 Figure 49 Auxiliary input 160 Figure 50 View settings 161 Figure 51 Calibrations 162 Figure 52 Initial cal 163 Figure 53 Process stdz 164 Figure 54 Data collect 164 Figure 55 Current loop Cal 164 Figure 56 Linearizer 165 Figure 57 Gauge status 166 Figure 58 Advanced Fxns 167 Figure 59 Process chain 168 Figure 60 Min max history 169 Figure 61 New hardware 170 Figure 62 Test mode 171 Figure 63 Other advanced 172 Figure 64 Select gage type 173
126. p gt 2828 SuiSueu NOILNVD ne o 9828 129195 Figure 65 Select gage location 173 Continuous Level with HART Technical Reference Manual Appendix IV HART menus screens Notes 174 Continuous Level with HART Technical Reference Manual count range 54 process span 54 2 20mA Level 105 4 4mA Level 105 active area between mounting brackets 24 Adj counts 54 Advanced Functions 53 for Remote HART Processor 153 Advanced Fxns 53 alarm analog alarm 113 setup 110 Alarm out 2 mA alarm setup 113 Alarm out 22 mA alarm setup 113 analog alarm acknowledging 77 selecting 2mA or 22mA 113 Analog alarm 71 analog output See current loop output applications 9 Aux channel chain 56 Aux raw counts 56 auxiliary input 118 multiple gauges 119 Auxiliary input test mode 65 B brackets 24 calibration current loop analog output 32 initial See initial calibration initial simple method of 37 initial standard method of 35 process 34 Counts high 55 Counts low 55 CPU board jumpers 81 replacing 93 test points 80 CPU EEPROM corrupt 60 alarm acknowledge 76 alarm setup 111 in diagnostic history 79 CPU EEPROM status diagnostics check 76 CPU serial number 68 CTC temperature controller 15 current loop calibrating on the bench 21 calibration 32 output fixed at 2mA or 22mA
127. pensation 148 Continuous Level with HART Technical Reference Manual Explanation of symbols Table 2 lists the symbols that the manual and instrument use Preface Table 2 Explanation of symbols Radiation notice In the manual information concerning radioactive materials or radiation safety information is found in the accompanying text Caution In the manual warnings concerning potential damage to the equipment or bodily harm are found in the accompanying text AC current or voltage On the instrument a terminal to which or from which an alternating sine wave current or voltage may be applied or supplied DC current or voltage On the instrument a terminal to which or from which a direct current voltage may be applied or supplied Potentially hazardous voltages On the instrument a terminal on which potentially hazardous voltage exists Continuous Level with HART Technical Reference Manual xiii Notes Continuous Level with HART Technical Reference Manual Preface HART software screens The two charts that follow illustrate the offline and online HART communication screens For complete illustrations of all HART hand held communicator menus and screens see Appendix Continuous Level with HART Technical Reference Manual uone nuis 6 o8 101S t 2410 31511 wa3
128. ransmitter Calibrating with multiple detectors summation The calibration procedures are the same with one or multiple detectors The summing of the counts from multiple detectors is invisible to the user When setting the span set it for the length that is the total of all the detectors Note In many cases you cannot fill or empty the process vessel for calibration Use the following hints in these situations With the vessel empty open the source holder shutter to simulate low level set low level in software Close the source holder shutter to simulate high level set high level in software Continuous Level with HART Technical Reference Manual 127 Appendix 11 Special applications NORM naturally occurring radioactive material compensation Products that contain natural radioactive materials for example radon may require special compensation of the level measurement The radiation emitted by the product material can interfere with the measurement since the detector cannot differentiate between the radiation from the source and the radiation from the product Achieve compensation of the measurement by using a second detector that measures only the radiation emitted by the product material A primary detector measures the process level measurement The signal from the secondary detector is input to the primary detector The primary detector runs an algorithm to subtract the effect of the material s radiation from the
129. ration steps Both calibration methods Collection of data points nearest the Maximum but not higher and Minimum but not lower levels occurs during calibration Refer to the Two Point procedure in this manual for the steps necessary to collect these data points In Figure 16 stars indicate the Maximum and minimum level data points Standard calibration method A standard calibration method requires collection of intermediate data points Use the Linear data collect function from the Calibrations Linearizer menus to collect these data points In Figure 16 circles indicate the intermediate data points Cal Low Counts Raw Sensor Counts Cal High Counts Max Level Cal Cal High Level Actual Level eng units Figure 16 Linearizer data collected at various process levels Continuous Level with HART Technical Reference Manual 38 Calibration Simple calibration method The simple method of calibration does not require collection of intermediate data points Standard calibration method Internal software calculates a linearizer curve based on data points The curve is the most accurate between the Cal Low Level and Cal High Level as shown in Figure 17 For this reason it is best to take the Cal Low and Cal High samples as close as possible to the Min Level and Max Level to maximize the accuracy within the span Simple calibration method Based on the Cal Low Level and Cal High Level the interna
130. rdware problem consult Ohmart Field Service Non critical memory corruption has occurred on the sensor pre amp board EEPROM and may not have been resolved internally To check if the problem is recurring after acknowledging the alarm cycle power to the unit If alarm occurs again it indicates a hardware problem Perform the procedure Repairing corrupted EEPROM on page 58 The clock has failed which may result in miscalculation of timed events If the transmitter has not been powered up for more than 28 days the time and date should be reset To resolve try to reset the time and date If the time and date do not reset call Ohmart Field Service The sensor temperature probe may not be functioning which will result in erroneous measurements Verify by checking the sensor temperature on the Advanced Fxns Process chain Primary channel screen If the temperature reads 0 5 constantly the probe is broken and the sensor assembly may need to replacement Call Ohmart Field Service A standardize procedure is due Alarm is acknowledged automatically by the system when a process standardize procedure is completed under the Calibrations Process stdz Screen A source wipe is due Alarm is acknowledged by logging a shutter check under Initial setup System parameters Source function screen See page 86 for details Non critical memory corruption has occurred on the CPU board EEPROM and may not have been resolved internally
131. rement a new Cal low counts value calculates which changes the percent span The algorithm for calculating the cal low counts is New cal low counts cal low counts 1 gain change in vapor density counts Where change in vapor density counts reference counts vapor density counts reference counts Variable definitions Reference counts Reference counts are counts from DSTH at reference pressure condition determined during first step of calibration Vapor density counts Vapor density counts are counts from DSTH at current pressure condition VC gain VC gain is the vapor compensation gain user enters value during calibration 138 Continuous Level with HART Technical Reference Manual Appendix Il Special applications Initial settings and calibration for vapor comp Setting up vapor compensation Procedure 53 Setting up vapor compensation 1 Perform the following steps to set the DSTH up as a level gauge e From the Main menu select Advanced Fxns e From the Advanced Fxns menu choose Select Gage type e From the Select Gage type menu select Level Press F2 to send to the transmitter 2 Return to the Main menu 3 Perform the following steps to select Vapor compensation From the Main menu select Auxiliary input e From the Auxiliary input menu select Compensation From the Compensation menu select Type e From the Type menu select Vapor e Press F4 to enter You return to the Compensation
132. rminal block Terminal block pins 8 and 9 pins 8 and 9 Volt meter Detector housing Detector housing Measurement with current meter Measurement with volt meter Figure 13 Measuring the current loop output Continuous Level with HART Technical Reference Manual 31 Calibration Before a current loop calibration Connect ammeter the DCS to terminal connections 8 mA 9 mA the test points H1 and H2 or anywhere along the current loop Make sure there is 250 1 0000 load on the current loop If no load or an insufficient load exists on the loop it may require temporary placement of a resistor across terminals 8 and 9 Hook the meter or DCS in series with the load resistor Calibrating the current loop 7 Procedure 1 Calibrating the current loop From Calibrations menu select Current loop cal The Current loop cal screen prompts you to connect the reference meter Press F4 when the ammeter connects The screen displays Setting Field Device Output To 4mA The analog output circuit on the transmitter sets the current to approximately 4mA Read the ammeter and enter the actual milliamp reading Note If using a voltmeter calculate the current value The next screen prompts Field Device Output 4 00mA Equal to Reference Meter e Choose Yes if the ammeter reads 4 00 e Choose No if the ammeter reads anything but 4 00mA Repeat until the meter reads 4 00mA The meter appr
133. rocess span 5 From the Process span screen set both the minimum and maximum values for the measurement span 6 Press F2 to send the setting to the transmitter 102 Continuous Level with HART Technical Reference Manual Appendix Initial factory setup Current loop span The current loop output can be set to be either forward acting or reverse acting by choosing the appropriate values of 4mA Level and 20mA Level A forward acting output is proportional to the level and a reverse acting output is inversely proportional to the level See Table 21for an example of settings for process values of 096 and 10096 The current loop span is the lowest and highest level to be indicated by the 4 20mA current loop analog output These settings do not have to be the same as the process span settings Min level and Max level but must be within the boundaries set for the process span The screens prompt entry of a 4mA Level and a 20mA Level Table 21 Setting process values of 0 and 10096 Forward acting proportional Reverse acting inversely proportional 4mA Level 20mA Level 4mA Level 20mA Level 100 100 0 Procedure 37 Setting the current loop span 1 From the Main menu select Initial setup 2 From the Initial setup menu select Process parameters 3 From the Process parameters menu select Spans 4 From the Spans menu select Current loop span 5 From the Current loop span menu select 4mA Level 6 In the 4mA
134. s 79 Troubleshooting 81 Communication problem flowchart 83 Transmitter not responding flowchart 84 Maintenance and repair 86 Periodic maintenance schedule 86 Source wipe and shutter check recording 86 Spare parts 88 Field repair procedures 90 Replacing the CPU board 91 Continuous Level with HART Technical Reference Manual Requesting field service 93 Returning equipment for repair to Ohmart 93 Process parameters 96 Units 96 Custom units 96 Calibration parameters 97 Filtering 99 Type RC exponential or rectangular window 99 Span settings 102 System parameters 104 Source type 105 Source function 105 System information 107 Setting up alarms 108 Diagnostic alarm setup 109 Analog alarm setup 111 Process alarm setup 111 X ray alarm setup 113 Setting the relay as an x ray alarm 115 Auxiliary input settings 116 Input filter 116 Summation mode 117 Multiple detectors summation 119 NORM naturally occurring radioactive material compensation 128 Vapor pressure compensation 135 Installation requirements 136 Initial settings and calibration for vapor comp 139 Calibrating with vapor compensation 140 Internal heater kit for applications below 50 C 142 Changes to specifications 142 Preserving information from Smart Pro 143 Integral retrofit 147 Upgrading hardware to HART electronics 148 Remote retrofit 149 Remote HART Processor RHP specifications 150 Remote HART Processor installation 151 Software settings required 151
135. s are self repairing for example RAM and EEPROM corruption Therefore these may appear in the history screens but not in the diagnostic screens You can view the status of diagnostic alarms in the Diagnostics screen from the Gauge status menu 72 Continuous Level with HART Technical Reference Manual Diagnostics and repair Acknowledging diagnostic alarms If a condition is in alarm you can acknowledge it turn it off in the Diagnostics screen from the Gauge status menu The following alarms are exceptions to this rule e Source wipe due e Shutter check due e Standardize due These exceptions acknowledge when the function performs Note If the relay is set as a diagnostic alarm you must acknowledge all diagnostic alarms to reset the relay Checking and acknowledging the diagnostic alarms with Gauge status Procedure 27 Checking and acknowledging diagnostic alarms 1 From the Main menu select Gauge status 2 From the Gauge status menu select Diagnostics 3 The first diagnostic condition displays Press F4 to view all the conditions 4 If a diagnostic condition is in alarm you can either e Clear the alarm by choosing Acknowledge alarm Or ignore the alarm by pressing NEXT 5 The message Current Status Complete displays after viewing all of the conditions Diagnostic alarm messages Active alarm messages may appear on the HART device if the alarm condition is toggled on You can toggle individual alarm cond
136. select Next shut chk due to view the due date 7 Press F4 to exit Continuous Level with HART Technical Reference Manual 87 Diagnostics and repair Spare parts Spare parts are available directly from Ohmart Parts and Repairs Department for U S and Canada installations Installations in other countries purchase spare parts through their local Ohmart representative LSTH spare parts Table 18 LSTH spare parts number Description Ohmart part number AC power supply board 237382 LSTH CPU board 238747 125mA fuse on CPU board 238661 2 5A fuse on CPU board 238662 HART Hand held Terminal or 236907 HART Modem kit 237857 LJTH spare parts Table 19 DTH spare part numbers Description Ohmart part number LJTH CPU board 239258 DF Amplifier 200216 Power supply 90 270 237475 6 temp control 115VAC power supply 227283 CTC 6 230 temp control VAC power supply 227284 Thermistor for temp control 227470 Thermostat safety 227485 Heating blanket amplifier housing 214530 LJTH 115VAC complete tested electronics assembly 237446 LJTH 230VAC complete tested electronics assembly 237447 125mA fuse on CPU board 238661 2 5A fuse on CPU board 238662 HART Hand held Terminal or 236907 HART Modem kit 237857 For heated LUTH models see LNTH spare parts list Table 20 88 Continuous Level with HART Technical Reference Manual Diagnostics and repair LNTH spare parts Table 20 LNTH spare part numbers Description Ohm
137. sing the linearizer type The level transmitter response curve is non linear due to the measurement method of radiation transmission The linearizer determines the shape of the curve between the endpoints As part of the signal processing necessary to produce a linear final output with respect to the change in level of process material the level transmitter offers the following choices 1 Non linear table 2 Linear table Non linear table Use this option for a standard method calibration The non linear table is more accurate than the linear table This is because it the non linear table takes into account the inherent non linearity of a nuclear transmission measurement The non linear table can use data from the following e Linearizer look up table data points that you collect and enter during the calibration process e Linearizer data from an earlier model Ohmart level gauge Table linear Use this option for a simple method calibration This option enables you to use a linear straight line set of data for a linearizer look up table You do not need to collect linearizer table data points The straight line linearizer calculates from the high and low level initial calibration points This requires you to perform the following e Two point calibration e Calculate the calibration This is not as accurate because it does not compensate for the non linearity of a radiation transmission measurement Continuous Level with HART Techn
138. sks aINBIYUOD AWN auou 291055944 auou Aduanbal4 Aouanbal4 ON gt JOU 1 Figure 1 HART screen Continuous Level with HART Technical Reference Manual Xvi Preface Sux4 peo ueApy snjejs suontJqi e dnjes peul urew VW AH HH jno AnD 2 HH HH p p uuo 5 sainyea 125 gauge connected Figure 2 HART screen xvii Continuous Level with HART Technical Reference Manual User s comments Ohmart values your opinion Please fill out this page so that we can continually improve our technical documentation Manual Continuous Level LSTH LJTH LNTH Technical Reference Manual Date Customer Order Number How we can contact you optional if you prefer to remain anonymous Name Title Company Address Did you find errors in this manual If so specify the error and page number Did you find this manual understandable usable and well
139. source holder s radiation Frequency 4 to 20 mA LSTH LJTH LNTH with S86 option Figure 36 NORM compensation system Special drawings for NORM Compensation Ideally identification of applications requiring NORM compensation occurs at the time of order The end user engineering contractor or both may have received certified drawings for the exact equipment ordered Refer to the drawings along with this section of the manual 128 Continuous Level with HART Technical Reference Manual Appendix Il Special applications Installation requirements You must install the detectors correctly for NORM compensation to work Mount the primary detector so it is in the source holder radiation beam Mount the secondary detector so that it is NOT in the source holder radiation beam vessel top view source holder primary detector secondary detector Figure 37 Placement of detectors for NORM compensation Continuous Level with HART Technical Reference Manual 129 Appendix Special applications Detector wiring Wire the secondary detector into the primary detector as shown in Figure 38 Notes for Figure 38 1 Voltage input to each detector is 115 or 230VAC 10 50 or 60Hz at 60VA maximum power consumption AC power does not share with transient producing loads Requires an individual AC lighting circuit Supply a separate earth ground Use 14 22 wire M
140. space and the continuous level detector to measure the product level Both must be in the radiation beam from the source holder Mount the DSTH so that it is above the highest expected product level Detector wiring The level detector provides a frequency signal to the DSTH The output of the DSTH is the calibrated vapor compensated 4 20mA signal for control and HART communication Figure 40 illustrates the interconnection between the density gauge and the level gauges 136 Continuous Level with HART Technical Reference Manual Appendix 11 Special applications SENSOR LOCATION TERMINAL STRIP CLOSEST TO CIRCUIT BOARD AC POWER CABLE TYPICAL LSF AUXILIARY FREQUENCY BLK INPUT AC POWER CABLI TERMINAL STRIP CLOSEST TO CIRCUIT BOARD TYPICAL LJF OR LNF H LJF OR H LNF USE AC POWER CABLE AUXILIARY FREQUENCY EARTH GROUND MEASURE SIGNAL AC POWER BLK WHT NEUTRAL L2 OR N MEASURE Horn SIGNAL EARTH GROUND Figure 40 Interconnect DSTH with LSF LJC LJF LNC LNF Continuous Level with HART Technical Reference Manual 137 Appendix Special applications Algorithm for vapor comp The vapor compensation algorithm adjusts the percent span based on a percent change in vapor density from a reference density Refer to the Calibration chapter for a complete discussion of continuous level gauge calibrations Each time the gauge computes a level measu
141. stall it on the new DF amplifier 5 Install the new amplifier cover plate 6 Install the electronics assembly 7 Wire the electronics assembly connector per the provided drawing 8 Generally the wiring from the detector to the old Ohmart EDS or Smart Series electronics can carry the new HART 4 20mA signal Bypass the old electronics so that the new HART 4 20mA signal runs directly to the DCS If the two wires are spliced at the old electronics ensure the connection is reliable 148 Continuous Level with HART Technical Reference Manual Appendix Retrofitting HART electronics Remote retrofit You can use a remote retrofit to HART support electronics with any continuous level gauge detector that produces a frequency output of 0 100kHz Examples of Ohmart level detectors meeting this requirement include e e LNS LS The additional hardware required is an Ohmart model RHP Remote HART Processor The RHP is contained in a separate housing and requires power and the input frequency signal from the level detector It outputs the 4 20 calibrated signal that carries the HART communication Frequency non HART detector Remote HART 4 to 20 mA Processor Figure 41 Level system with Remote HART Processor Continuous Level with HART Technical Reference Manual 149 Appendix Retrofitting HART electronics Remote HART Processor RHP specifications Table 35 Remote HART Processor RHP specifications
142. stem information message 1 From the Main menu select Initial setup 2 From the Initial setup menu select System parameters 3 From the System parameters menu select System info 4 From the System info menu select Message 5 In the Message screen enter messages or notes for the operator 6 Press F4 to enter 7 If using a hand held HART communicator press F2 to send the updated parameters to the transmitter Descriptor This is a shorter message field to record information or messages Procedure 42 Setting the descriptor 1 From the Main menu select Initial setup 2 From the Initial setup menu select System parameters 3 From the System parameters menu select System info 4 From the System info menu select Descriptor 5 In the Descriptor screen enter a short message or note for the operator 6 Press F4 to save 7 If using a hand held HART Communicator press F2 to send the updated parameters to the transmitter Continuous Level with HART Technical Reference Manual 107 Appendix Initial factory setup Setting up alarms Four types of alarms are available 1 Diagnostic 2 Analog 3 Process 4 X ray The Diagnostics and Repair chapter thoroughly explains use and acknowledgement of alarms When you set up alarms the following options are available e Which alarm type triggers the output relay e Which diagnostic messages appears on the HART display screens output level of the analog
143. t Communication problem suspected START Get Factory firmware vxx or Firmware message No Get Device not found message on HART device No Get Lost connection to unit or Device discon nected message No Continuous Level with HART Technical Reference Manual Firmware version is incorrect for tag If you are daisy chaining multiple detectors Yes see manual section Or call Ohmart Field Service to replace Are Is load on current loop wiring 4 10 20 mA loop Go to connections between B Yes 250 700 Yes No No Correct wiring Add 250 ohm load connections resistor across A current loop Is HHT Is current across or modem operating load resistor between Yes 2 and 22 mA Yes Check on another transmitter No No 00 10 Refer to HART device Transmitter manual for troubleshooting Not or Responding Replace HART flowchart device Hook up HART device at transmitter D at test points H1 and H2 Check current loop wiring connections Go to Check that load on loop A Yes i less than 1000 ohm Go to Does transmitter communicate with hand held terminal or modem No Go to Transmitter Not Responding flowchart Diagnostics and repair Go to D Yes Check current loop wiring connections Ye Check that load on loop is less than 700 ohm Figure 26 HART Communication flowchart Go to
144. t coat it This ensures the continuing proper operation of the source ON OFF mechanism Many regulatory agencies for example the U S NRC require periodic testing of the ON OFF mechanism Special instructions concerning your source holder are found in the envelope that was shipped with the source holder and the Radiation Safety for U S General and Specific Licensees Canadian and International Users Manual and Radiation Safety Manual Addendum of Reference Information Please refer to this document for radiation safety information Stable temperature Mount the level gauge on a portion of the line where the temperature of the process material is relatively stable Process temperature can effect the gauge indication The amount of the effect depends upon the following Sensitivity of the gauge Temperature coefficient of the process material Protect insulation If insulation is between the measuring assembly and the process protect the insulation from liquids The absorption of a liquid such as water can affect the gauge indication because it blocks some radiation Avoid internal obstructions The best possible installation of a nuclear level gauge is on a vessel that has no internal obstructions agitator baffle manways and so forth directly in the path of the radiation beam If one of these obstructions is present it can shield the radiation from the detector causing an erroneous reading If the vessel has a c
145. t gage type 69 Select gage location 69 Checking and acknowledging diagnostic alarms 73 Recording a source wipe or shutter check 86 Check due date of source wipe or shutter check 87 Replacing the CPU board 91 Returning equipment for repair 94 Setting the process units for density 96 Setting custom units 97 Setting the calibration parameters 98 Selecting a filter type damping and fast cutoff 101 Setting the process span 102 Level with HART Technical Reference Manual xi Procedure 37 Procedure 38 Procedure 39 Procedure 40 Procedure 41 Procedure 42 Procedure 43 Procedure 44 Procedure 45 Procedure 46 Procedure 47 Procedure 48 Procedure 49 Procedure 50 Procedure 51 Procedure 52 Procedure 53 Procedure 54 Procedure 55 xii Setting the current loop span 103 Setting the time and date 104 Setting the source type 105 Setting the tag identifier 106 Setting the system information message 107 Setting the descriptor 107 Setting the relay as a diagnostic alarm 110 Setting the diagnostic alarm conditions 110 Setting the analog alarm output 111 Setting up the process alarm 112 Setting up the x ray alarm parameters 114 Setting the relay as an x ray alarm 115 Setting the input filter 116 Setting up summation mode 127 Setting up NORM compensation 132 Calibrating with NORM compensation 134 Setting up vapor compensation 139 Calibrating with vapor compensation 140 Calibrating with vapor com
146. tage of the cycle period to output the dither Default value 1 Table 25 X ray alarm conditions Threshold Dither level Dither time Cycle period Setting up the x ray alarm parameters Procedure 47 Setting up the x ray alarm parameters 1 From the Main menu select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu select Mode configuration 4 From the Mode configuration menu select Xray alarm 5 Edit the following values as necessary e Threshold Dither level e Cycle period e Dither time 6 If using a hand held Communicator press F2 to send the changes to the transmitter 114 Continuous Level with HART Technical Reference Manual Appendix Initial factory setup Setting the relay as an x ray alarm Procedure 48 Setting the relay as an x ray alarm 1 From the Main menu select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu choose Set relay function 4 From the Set relay function menu select X ray 5 Press F4 to enter 6 If using a hand held HART Communicator press F2 to send the setting to the transmitter Continuous Level with HART Technical Reference Manual 115 Appendix Initial factory setup Auxiliary input settings The auxiliary input is an option for the HART level transmitter to receive a frequency signal With special software the frequency signal incorporate into the final output The software provides special settings f
147. ter You can collect linearizer table data along with the data collection for the Cal low and Cal high levels Collecting linearizer table data Procedure 6 Collecting linearizer table data 1 From the Main menu select Calibrations 2 From the Calibrations menu select Linearizer 3 From the Linearizer menu select Linearizer data 4 From the Linearizer data menu select Linear data collect 5 From Linear data collect menu select Collect datapoint 6 At the prompt enter the actual known level of process 7 Accept reject the results when they display 8 Repeat procedure for all available levels 9 Press F2 to send Continuous Level with HART Technical Reference Manual 47 Calibration Note Include the data for the Cal low and Cal high with the linearizer data before you perform Calculate linearity If you did not perform a linearizer data collect while the process was at the levels for Cal low and Cal high you can manually add those values to the linearizer data To add a data point to the linearizer data you must know the level in engineering units and the sensor counts Go to the Add new data pt screen from the Calibration Linearizer Linearizer data Linear data collect menus and follow the prompts to enter the data Step 4 Calculating the linearity Note The simple method of calibration does not use this step After collecting the data for a linearizer table the transmitter uses the data to ca
148. ter does not use Jumpers J1 J4 Do not change the jumpers from the current setting without consulting Ohmart Field Service The jumpers for the current loop power source or sink mode are set as follows Table 15 Jumper settings Mode Jumper setting J5 1 2 6 1 2 J5 2 3 J6 2 3 Source mode transmitter current loop is self powered Sink mode transmitter current loop is DCS powered LED indicators Check the basic functioning of the HART level transmitter at the instrument with LED indicators on the CPU board They are visible when you remove the explosion proof housing pipe cap See the following table on page 80 for a summary of the LED indications CODI Pins to CPU board eoo e eoo OOO Oo Normal FLASH corrupt Figure 23 LED indicators FLASH corrupt LED pattern The FLASH chip stores the gauge software The transmitter does not operate if the FLASH chip is corrupt A HART device that connects to the transmitter displays the message No Device Found In this situation the LED bank displays a distinctive pattern shown in the figure above Call Ohmart Field Service to report this condition It is possible to perform a remote upload of new software to the FLASH chip Continuous Level with HART Technical Reference Manual 79 Diagnostics and repair LED summary table LED 5 Mem HART 30 CPU Aux HV Relay Field 80 Description 5 D
149. tering when the change in process exceeds this value in engineering units between successive samples This enables the level transmitter to respond immediately to large step changes while filtering the smaller variations in the signal caused by noise and normal process variations To turn off the fast cutoff filter set the value to zero 100 Continuous Level with HART Technical Reference Manual Appendix Initial factory setup Selecting a filter type damping and fast cutoff 10 Procedure 35 Selecting a filter type damping and fast cutoff From the Main menu select Initial setup From the Initial setup menu select Process parameters From the Process parameters menu select Filtering From the Filtering menu select Filter type On the Filter type screen the currently used filter type displays as either RC Exp Filter or Rect Window Filter To change the filter type select either RC Exp Filter or Rect Window Filter Press F4 to enter From the Filtering menu select Damping From the Damping screen enter the damping desired and F4 to enter Refer to the help screens F1 or page 99 in this manual for details From the Filtering menu select Fast cutoff From the Fast cutoff screen enter the cutoff value desired and press F4 to enter Refer to the help screens F1 or page 99 in this manual for details Note To turn off Fast cutoff enter as the value If using a hand held HART Communicator press F2 to send the updated f
150. tested electronics assembly 238925 LJTH 230 VAC complete tested electronics assembly 238926 125 mA fuse on CPU board 238661 2 5 A fuse on CPU board 238662 For heated LJTH models see LNTH spare parts list Table 28 LNF spare parts Table 28 LNF spare parts Description Ohmart part number LNF CPU board 238748 DF Amplifier 200216 CTC 6 115 VAC power supply 227283 CTC 6 230 VAC power supply 227284 LNF 115 VAC complete tested electronics assembly 238933 LNF 230 VAC complete tested electronics assembly 238934 125 mA fuse on CPU board 238661 2 5 A fuse on CPU board 238662 These parts also apply to the heated LNF model H LNF and the heated model H LJF Continuous Level with HART Technical Reference Manual 121 Appendix Il Special applications Installation requirements A multiple detector application consists of one HART level transmitter and one or more level gauges that output a frequency to the HART transmitter Follow these installation guidelines e Install the detector with the HART output model LSTH LJTH or LNTH at the top of the vessel Install the other detector s beneath the HART detector mounting tabs of the detectors define the active or sensing length Offset the detectors vertically so that the end of the top detector s active length corresponds to the beginning of the bottom detector s active length e Place all detectors in the radiation beam HART detect
151. the LSTH models it mounts into a slot in the black plastic sensor housing e Unscrew the CPU board from the plastic sensor housing e Slide the CPU board out from the slot in the plastic sensor housing CAUTION LSTH Model NEVER open the black plastic sensor housing No part of the sensor is field repairable Opening the housing may damage its seals making it inoperable Continuous Level with HART Technical Reference Manual 91 Diagnostics and repair 10 11 12 13 14 15 16 17 18 92 Procedure 30 Replacing the CPU board continued Note Check the jumper settings on the old CPU board Verify that the new CPU board has the jumpers set up in the same manner To install the new board perform the following e Slide the new board into the slot on the plastic sensor housing just behind CN1 and in front of the two front mounting screws Screw the board into the sensor housing using the standoffs Plug in all removable terminal strips in the reverse order removed e Plug in the interconnect terminal at CN1 last Apply power Check the LED bank LED 5 should blink indicating the CPU is functioning Plug a HART device into test points H1 and H2 on the transmitter if possible If this is not possible use your normal HART connection point For the LSTH model only The HART device should indicate an error message New Hardware Found FOR the LSTH model only Using the HART device move throug
152. the Main menu select Initial setup 2 From the Initial setup menu select Process parameters 3 From the Process parameters menu select Process units 4 From the Process units menu select Custom units 5 From the Custom units screen select Conversion to length 6 Enter the conversion factor in factor in custom units per inch 7 Press F4 to enter 8 Press the LEFT ARROW to move back to the Process units menu 9 From the Process units menu select Level units 10 In the Level units screen select Spcl as the units 11 If using a hand held HART Communicator press F2 to send the units to the transmitter This ensures that other setup and calibration functions use the correct engineering units Calibration parameters Data coll interval Data collection interval is the time in seconds over which the system collects a process measurement Use this interval time to collect data for e Initial calibration e Linearizer curve e Standardization Warn span cal Warning percentage span calibration is the difference between the two initial calibration points cal low level and cal high level as a percent of level span that causes a warning to appear For a good calibration it is important for the two initial calibration points to be as far apart as possible The default value is 10 The user typically does not need to changes this value for most applications Continuous Level with HART Technical Reference Manual 97 Appendix Initial fact
153. to one of its components Before replacing the CPU board check the troubleshooting flowcharts or call Ohmart Field Service to be sure a replacement is necessary In LSTH models the sensor EEPROM contains a backup of the CPU board EEPROM After physically replacing the CPU board you must perform a memory backup to update the CPU board EEPROM with the information in the sensor board EEPROM Perform the memory back up in the New hardware screen from the Advanced Fxns menu Procedure 30 Replacing the CPU board 1 At the DCS remove level transmitter from automatic control loop 2 If possible shut off power to the level transmitter at an external junction 3 When working near the source holder it is a good practice to turn the source off by turning the source holder shutter to the OFF position 4 At the transmitter housing remove pipe end cap Use caution it is heavy 5 Locate the CPU board and remove the two 11 pin pluggable terminal blocks at to disconnect the interconnect wiring 6 Unscrew the bolt on the L bracket Slide the detector assembly out of the pipe housing T If the level transmitter uses AC power remove the 5 pin pluggable terminal block at CN3 to disconnect the CPU board power wiring from the AC power supply 8 Remove the 15 pin pluggable terminal block at CN2 located underneath the CPU board to disconnect the wiring to the sensor assembly 9 Threw screws hold the CPU board to the sensor assembly On
154. two electrically erasable programmable read only memory EEPROM chips The EEPROMs store all data specific to that sensor electronics pair for the installation The locations of the EEPROMs are e Onthe CPU board e the sensor board Each EEPROM contains a backup of the other EEPROM The system monitors both EEPROMs at power up to assure an accurate backup If you install a new CPU board or sensor assembly which includes the sensor board the EEPROM backups on the CPU and sensor boards do not match The software signals the discrepancy with the error message New Hardware Found The transmitter does not automatically perform a backup in case the discrepancy is not due to new hardware but some corruption of the EEPROM Note Only use the New hardware functions if you replace either the CPU board or sensor assembly and the other is to remain on the same installation This function is not necessary if installing a completely new detector assembly The new detector assembly includes the CPU board and the sensor assembly Proper response to New hardware found message if new hardware HAS been installed When you install a new CPU board or a new sensor assembly you must verify installation in the New hardware screen This function enables new backups of the EEPROMs This message never appears on systems with ion chambers models LNTH and LJTH Continuous Level with HART Technical Reference Manual 57 Advanced functions If an
155. u select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu select Mode configuration 4 From the Mode configuration menu select Diagnstic alarm 5 If using a hand held HART communicator from the Diagnstic alarm menu select Diagnstic Gp1 Diagnostic Group 1 If using Ohmart View proceed to the next step 6 From the Diagnstic Gp1 screen scroll through the list of diagnostic conditions that can be used to activate the relay e Toggle the conditions On or Off with the F2 key Press F4 to enter Press the LEFT ARROW key to return to the Diagnstic alarm screen T If using a hand held HART Communicator from the Diagnstic alarm menu select Diagnstic Gp2 Diagnostic Group 2 8 From the select Diagnstic Gp2 screen scroll through the list of diagnostic conditions and toggle the conditions On or Off 9 If using a hand held HART communicator press F2 to send the setting to the transmitter Setting the relay as a diagnostic alarm Procedure 44 Setting the diagnostic alarm conditions 1 From the Main menu select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu choose Set relay function 4 From the Set relay function menu select Diagnstic and press F4 to enter 5 If using a hand held HART communicator press F2 to send the setting to the transmitter 110 Continuous Level with HART Technical Reference Manual Appendix Initial factory setup Ana
156. ues functioning in sensor test mode until it times out after one hour or until you choose Exit test mode Exit sensor test mode Procedure 17 Exit Sensor test mode 1 From the Advanced Fxns menu select Test mode 2 From the Test mode menu select Sensor test mode 3 From the Sensor test mode menu select Exit test mode 4 At the prompt select Yes to exit the test mode Continuous Level with HART Technical Reference Manual 63 Advanced functions Auxiliary input test mode The auxiliary input test mode simulates the auxiliary input frequency at a user defined number of counts The effect of auxiliary input counts depends on the auxiliary input mode Examples are e Temperature probe e Flow meter e Second transmitter While in auxiliary input test mode after you enter the desired number of counts it may be useful to look at the Process chain screen to view the variables affected by the auxiliary input counts value To view the Process chain screen back out of the test mode screens using the LEFT ARROW The transmitter continues to operate in auxiliary input test mode until it times out after one hour or until you choose Exit auxiliary input test mode Start auxiliary input test mode Procedure 18 Start Auxiliary test mode 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu select Test mode 3 From the Test Mode menu select Aux Inp test mode 4 From the Aux Inp test mode menu select Aux Inp test m
157. vanced functions Sensor test mode The sensor test mode simulates the sensor output at a user defined number of raw counts This is before application of the following e Temperature compensation e Sensor uniformity gain e Standardize gain The true sensor output is ignored while the transmitter is in sensor test mode Sensor test mode is extremely useful for verifying the electronics and software response to input counts without having to perform the following e Change the process e Shield the source e Vary the radiation field While in sensor test mode after entering the desired number of counts it may be useful to look at the Process chain screen to view the variables affected by the raw counts value To view the Process chain screen back out of the test mode screens pressing the LEFT ARROW The transmitter continues to operate in sensor test mode until it times out after one hour or until you choose Exit test mode 62 Continuous Level with HART Technical Reference Manual Advanced functions Start sensor test mode Procedure 16 Start Sensor test mode 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu select Test mode 3 From the Test Mode menu select Sensor test mode 4 From the Sensor test mode menu select Enter test mode 5 At the prompt enter the value of the new counts you want to force 6 At the prompt select Yes to start the test mode and send new data 7 The transmitter contin
158. zer to Table linear in Calibrations Linearizer screen Change measurement span in Initial setup screens Is process span set correctly Perform Set Cal low level and Set Cal high level steps in any sequence in Initial cal screens Perform Cal result function in Initial cal screens Figure 15 Simple method calibration flow chart Continuous Level with HART Technical Reference Manual Table 10 Simple method calibration Simple method calibration Step in flow chart Check process engineering units Check process span Check linearizer type set to linear table Check the repeatability of measurement Perform Set Cal low level and Set Cal high level Perform Cal result Manual heading Units Span settings process span Choosing the linearizer type Checking the gauge repeatability Step 1 Set low level Step 2 Set high level Step 5 Calculate calibration Continuous Level with HART Technical Reference Manual Page 96 101 37 42 45 46 48 Calibration 37 Calibration Theory of calibration This section explains both the standard and simple methods of calibration Both calibration methods Enter the values that define the maximum and minimum levels to measure in the Process span screens from the Initial setup Process parameters Spans menus These parameters are Max Level and Min Level and must be set correctly before any of the calib

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