Model: HIT-3 USER`S MANUAL - Hoffer Flow Controls, Inc
Contents
1. 13 5 Configuration 14 5 1 Default Configuration 14 5 2 Windows Configuration 14 5 3 Remote Configuration 14 6 Operation and Maintenance 16 6 1 Operation 16 6 2 Maintenance 16 Appendix A Default Configuration 17 Factory Default Settings 17 HyperTerminal Response 18 Appendix B Communications 19 Message Format 19 Messages 21 HP 308 Introduction 1 1 INTRODUCTION The HIT 3 is a microprocessor based intelligent signal conditioner for turbine flowmeters It improves meter linearity to 0 05 over the specified meter flow range It is limited only by the repeatability of the meter The HIT 3 can also provide pulse security for level B applications The instrument is compatible with all Hoffer turbine flowmeters The instrument can accept a low leve2. OPTICALLY ISOLATED OUTPUT A SIG A SIG OUT OUT R1 3 3 K 1 2W VDC IN CUSTOMER DCS IN POWER SUPPLY 5 30 VDC REDI PULSE COIL INSTALLATION HP 308 12 Installation REDI PULSE COIL A REDI PULSE COIL B B B SIG B A B SIG c A SIG A SIG OPTICALLY ISOLATED OUTPUT OUT OUT DC xa O 3 VDC IN IN VDC VDC CUSTOMER DCS POWER SUPPLY 5 30 VDC REDI PULSE COIL INSTALLATION W PULSE SECURITY 4 2 Communications Connections The HIT 3 s K factors frequencies and time base are fully configurable via the RS232 communications port The configuration and monitoring can be performed using any PC based communications program e g HyperTerminal or ASCII terminal Communication with the HIT 3 requires removal of the face plate and a Hoffer Flow Controls HIT2A 301 Communications Cable The RS232 serial port of the computer terminal externally powers the communication circuits of the HIT 3 Power must be supplied to the HIT 3 DC and DC to communicate with the HIT 3 The serial port configuration must also be set to the following Baud rate 2400 Data bits 8 Parity none Stop bits 1 Handshaking none Molex DB9 nz Pabi CD 1 VDCI DN 6 DSR To TRTS id aes VDC2 f 4 DTR 4 Sela LN SIG COM 5 FINE Pin 1 Hoffer
3. FC Linearization 0 Average K factor 1 Linearization table F C METHOD AVG for Average K factor or F C METHOD LIN for Linearization table KD K Factor Decimal Point Location o for 00000000 1 for 0000000 0 and all K Factors are less than 9999999 9 otherwise not allowed otherwise not allowed 3 for 00000 000 and all K Factors are less than 99999 999 otherwise not allowed K FAC DECL DATA AK Average K Factor 0 001 to 99999 999 ifKD 3 999999 99 ifKD 2 9999999 9 ifKD 1 99999999 ifKD 0 AVG KFAC DATA NP Number Points in the Table n 2 id to n 2 0 wn NUM PTS DATA HP 308 2 for 000000 00and all K Factors are less than 999999 99 Appendix B Communications 23 lt Command Description Allowed Data Response F Frequency 1 20 F01 hasarangeof 0 000 to the value of F02 minus 0 001 F20 hasarange of the value from F19 plus 0 001 to 5000 000 Frequencies F02 to F19 must be 0 001 greater than the previous frequency and 0 001 less than the next frequency FREQ DATA for F01 through F20 Data to fixed three decimal places K K Factor 1 20 K FACT DATA for KO1 through K09 K FACT DATA for K10 through K20 DATA to decimal places as per KD command UI DA Unit Identificat
4. lt CR gt To edit enter comm follow by lt gt lt new value gt and lt CR gt COMMANDS DN TAG NUM F FREQ 01 20 TU TOT UNITS K KFAC 01 20 NB MAX M TIME UI UNIT MODEL CF CORR FACT DA DUMP ALL FM FLOW UNITS AA AUTO DATA FC F C METHOD US UNIT STAT KD K FAC DECL CS CLEAR STAT AK AVG KFAC PR PULSE REL NP NUM PTS HP 308 Appendix B Communications 19 APPENDIX B COMMUNICATIONS Message Format Communication messages consist of a string of ASCII characters terminated by a carriage return character The maximum message length coming to the HIT 3 is 20 characters including the carriage return The HIT 3 will transmit no more than 35 characters before transmitting a carriage return If a message longer than A 20 characters command is sent the instrument responds with Command Sequence is Too Long lt NL gt If an unrecognized or invalid command is sent the instrument responds with Invalid Command lt NL gt The sending unit RS232C serial port configuration must be configured as follows Baud rate 2400 Data bits 8 Parity none Stop bits 1 Handshaking none The HIT 3 echoes all received messages and then transmits a response string terminated with a carriage return If the sending unit takes longer than one minute to send a message the HIT 3 aborts the message by clearing the receive buffer If the sending unit PC or other such dev
5. of the preamplifier and performs all of the calculations that are required to control the Pulse Output After measuring the frequency of the square wave the Microcontroller uses the following equations to compute the pulse output pulse output onen x Kavg Kfactor Where Frequency the of pulses per second Kfactor Is the Linearized K Factor from the Frequency K Factor table Kavg Is the average K Factor Pulse Output The Pulse output is an optically isolated open collector output The pulse output provides a linearized pulse output calculated from the flowing frequency and the K Factors The output is rated for 100 VDC at 100 mA 3 1 4 Communications Interface The communication is provided through a RS232C interface to the Microcontroller The external terminal device provides the power for the RS232 interface The Communications Interface is used to configure the device See section 4 2 for operating instructions HP 308 8 Theory of Operation 3 2 Pulse Security A transmission line between flow meter pick up coil and an electronic flow computing device is subject to electromagnetic interference EMI generated by external electrical sources The exposure to the EMI may result in injecting faulty pulses into the transmission line which can cause the computing device to calculate an incorrect amount of measured fluid The HIT 3 Pulse Security option is designed to protect against errors resulting from int
6. BILITY EMBRACES THE PURCHASER S EXPENSES FOR DOWNTIME OR FOR MAKING UP DOWNTIME DAMAGES FOR WHICH THE PURCHASER MAY BE LIABLE TO OTHER PERSONS DAMAGES TO PROPERTY AND INJURY TO OR DEATH OF ANY PERSONS HFC NEITHER ASSUMES NOR AUTHORIZES ANY PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE OR USE OF HFC s GOODS AND THERE ARE NO ORAL AGREEMENTS OR WARRANTIES COLLATERAL TO OR AFFECTING THE AGREEMENT PURCHASER S SOLE AND EXCLUSIVE REMEDY IS THE REPAIR AND OR REPLACEMENT OF NONCONFORMING GOODS AS PROVIDED IN THE PRECEDING PARAGRAPHS HFC SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES HFC 9907 LIMITED WARRANTY POLICY FOR HOFFER FLOW CONTROLS HOFFER FLOW CONTROLS INC HFC warrants HFC s Precision Series and API Series of turbine flowmeters to be free from defects in material and workmanship under normal use and service only if such goods have been properly selected for the service intended properly installed and properly operated and maintained as described in the turbine flowmeter manual Reference turbine flowmeter manual for specific details This warranty shall extend for a period of five 5 years from the date of shipment to the original purchaser and covers the Precision Series and API Series of flowmeters All other HFC products carry a one 1 year warranty This warranty is extended only to the original purchaser Purchaser Purchas
7. HIT2A 301 Communications Cable HP 308 Pin 2 Installation 13 4 3 Wiring When connecting the HIT 3 it is good practice to use shielded cable The shield should be connected to earth ground near the instrument The other end of the shield should not be connected In order to comply with the requirements for Electromagnetic Compatibility as per EMC Directive 89 336 EEC of the Council of European Community this wiring practice is mandatory 4 4 Terminal Designations Terminal Description DC DC Power Input DC DC Power Input OUT Pulse Output OUT Pulse Output A SIG Flow Meter Input A SIG Flow Meter Input B SIG Flow Meter Input Pulse Security Option B SIG Flow Meter Input Pulse Security Option HP 308 14 Configuration 5 CONFIGURATION The HIT 3 is fully configurable with all parameters being stored in non volatile memory When the instrument is purchased with a Hoffer Flowmeter or calibration and configuration data are supplied the HIT 3 is configured at the factory before shipment 5 1 Default Configuration When the instrument is shipped without specific configuration information the instrument is configured with default values Refer to Appendix A for a listing of the HIT 3 factory default configuration 5 2 Windows Configuration Follow the instructions from section 4 2 to setup the equipment for communications For instructions on the windows config
8. Hoffer Intelligent Signal Conditioner Model HIT 3 USER S MANUAL HOFFER FLOW CONTROLS INC pa asa ANTELAIGENT TRANSMITTER MODEL HIT 3 4 1 SP SN 92844 n HP 308 August 2004 H HOFFER FLOW CONTROLS INC The Turbine Flowmeter Company 107 Kitty Hawk Lane P O Box 2145 Elizabeth City NC 27906 2145 800 628 4584 252 331 1997 FAX 252 331 2886 www hofferflow com E mail info hofferflow com This page intentionally left blank HP 308 NOTICE Hoffer Flow Controls Inc makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose This manual has been provided as an aid in installing connecting calibrating operating and servicing this unit Every precaution for accuracy has been taken in the preparation of this manual however Hoffer Flow Controls Inc neither assumes responsibility for any omissions or errors that may appear nor assumes liability for any damages that result from the use of the products in accordance with information contained in the manual HOFFER FLOW CONTROLS policy is to provide a user manual for each item supplied Therefore all applicable user manuals should be examined before attempting to install or otherwise connect a number of related subsystems During installation care must be taken to select the correct interconnecting wiring drawing The choice of an incorrect conne
9. NGLE UNIT UP TO 20 HIT 3 UNITS CAN BE MOUNTED ON A SINGLE RAIL ADD 2 PER UNIT 3 0 MEETS CLASS 1 DIV 1 AND 2 GROUPS C D 3H O CLASS II GROUPS E F G BODY KILARK GECCT 3 STOCK 200 0945 USE FLAT COVER FOR OPTION 3 0 STOCK 200 0533 KILARK GECBC DOME COVER DOES NOT MEET GROUP C USE DOME COVER FOR MODEL 3H O DOME COVER MUST BE USED FOR A C POWERED UNITS 3B 0 MEETS CLASS I DIV 1 AND 2 GROUPS A B C D 3BH O CLASS 1 ZONES 1 AND 2 GROUPS IIB H2 ITA CLASS II DIV 1 AND 2 GROUPS E F G CLASS III NEMA 3 4 7 B C D 9 E F G CERTIFIED CENELEC CSA UL FM BODY KILARK HKB STOCK 200 0406 USE FLAT COVER FOR OPTION 3B O STOCK 200 0773 KILARK HKB B USE DOME COVER FOR MODEL 3BH O STOCK 200 0405 KILARK HK2D 3B O ATEX MEETS CLASS I DIV 1 AND 2 GROUPS A B C D CLASS 1 ZONES 1 AND 2 GROUPS IIB H2 IIA CLASS II DIV 1 AND 2 GROUPS E F G CLASS II NEMA 3 4 7 B C D 9 E F G CERTIFIED ATEX CENELEC CSA UL FM BODY COVER STOCK 200 2006 HP 308 2A Introduction LINEARIZED PULSE OUTPUT UP TO 20 POINTS MODEL HIT 3 _ _ _ _ OPTION 1 OPTO ISOLATED OPEN COLLECTOR ACCURACY 0 05 140 PULSES INPUT POWER MODEL HIT 3 _ _ C_ OPTION D 5 TO 30 VDC LESS THAN 4MA EXTERNAL POWER AC 115 220 VAC 50 60HZ EXTERNAL POWER USE MODEL ACC39B OPTIONAL PULSE SECURITY MODEL HIT 3 __ _ _ C2 _
10. OPTION PSB PULSE SECURITY REQUIRES TWO COILS ON THE TURBINE SPACED 90 ELECTRICAL DEGREES COMPLIES WITH ISO 6551 SPECIAL FEATURES MODEL HIT 3 _ _ C_ C_ OPTION CE CE MARK REQUIRED FOR EUROPE CSA CSA APPROVED INTRINSICALLY SAFE CLASS I DIV 1 GROUPS A B C W WINDOWS BASED RS 232 SERIAL PORT CONFIGURATION PROGRAM WITH DISK AND 6 FT COMMUNICATION CABLE OTHER LENGTHS NOT AVAILABLE IF 3 OR MORE HIT S ARE ORDERED ON THE SAME PURCHASE ORDER ONE SET IS SUPPLIED AT NO CHARGE SP ANY SPECIAL FEATURES THAT ARE NOT COVERED IN THE MODEL NUMBER USE A WRITTEN DESCRIPTION OF THE SP NOTE INPUTS ACCEPTS MAGNETIC REDI PULSE AND HALL EFFECT COILS HP 308 2B Introduction This page intentionally left blank HP 308 Specifications 3 2 SPECIFICATIONS 2 1 2 2 General K factor Linearization Decimal Points Accuracy Temperature drift Inputs Magnetic Pickup Frequency Range Signal Type The pulses per unit of Total e g pulses gallon are configurable in the range 0 001 to 99 999 999 Up to 20 points Decimal Point positions are fully configurable for K Factors 1 count 50 ppm C 10 Hz to 3500 Hz Low level sinusoidal 30 mV P P minimum Opto Isolated DC Pulse Frequency Range Signal Type High Logic 1 Low Logic 0 Min Current Hystersis Min Pulse width Contact Closure Frequency Range Signal Type High Logic 1 Low Logic 0 Inte
11. ction drawing may result in damage to the system and or one of the components Please review the complete model number of each item to be connected and locate the appropriate manual s and or drawing s Identify all model numbers exactly before making any connections A number of options and accessories may be added to the main instrument which are not shown on the basic user wiring Consult the appropriate option or accessory user manual before connecting it to the system In many cases a system wiring drawing is available and may be requested from Hoffer Flow Controls This document contains proprietary information which is protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated to another language without the prior written consent of Hoffer Flow Controls Inc HOFFER FLOW CONTROLS policy is to make running changes not model changes whenever an improvement is possible This affords our customers the latest in technology and engineering The information contained in this document is subject to change without notice THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE HFC SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OR LOSS OF USE OF THE GOODS WITHOUT LIMITING THE GENERALITY OF THE FOREGOING THIS EXCLUSION FROM LIA
12. er s sole and exclusive remedy is the repair and or replacement of nonconforming goods as provided in the following paragraphs In the event Purchaser believes the Hoffer product is defective the product must be returned to HFC transportation prepaid by Purchaser within the appropriate warranty period relative to the product If HFC s inspection determines that the workmanship or materials are defective and the required maintenance has been performed and has been properly installed and operated the product will be either repaired or replaced at HFC s sole determination free of additional charge and the goods will be returned transportation paid by HFC using a transportation method selected by HFC Prior to returning the product to HFC Purchaser must obtain a Returned Material Authorization RMA Number from HFC s Customer Service Department within 30 days after discovery of a purported breach of warranty but not later than the warranty period otherwise such claims shall be deemed waived See the Return Requests inquiries Section of this manual If HFC s inspection reveals the Hoffer product to be free of defects in material and workmanship or such inspection reveals the goods were improperly used improperly installed and or improperly selected for service intended HFC will notify the purchaser in writing and will deliver the goods back to Purchaser upon receipt of Purchaser s written instructions and agreement to pay the cost of transp
13. erfering pulses injected into the transmission line The Pulse Security option requires a dual coil meter which generates a quadrature signal and dual transmission lines between meter and a computing device The HIT 3 Pulse Security option complies with ISO6551 requirements for pulse security systems Coil B Zz nnan nnn Turbine flowmeter Pulse Output Coil A Fig 1 Pulse Security System with HIT 3 3 2 1 Normal operation Under normal operating conditions each pulse generated by coil B is paired with a pulse generated by coil A Pulses from coil A are lagging behind the pulses from coil B by about 90 degrees of electrical phase The HIT 3 front panel LED indicator stays off If connections to coil A and B are reversed or if the flow reverses the LED turns ON to indicate incorrect sequence between pulses A and B Coil B l l l col J LY LI LAF LI LI L Fig 2 Normal condition pulse sequence HP 308 Theory of Operation 9 3 2 2 Double pulse condition A double pulse condition exist when an external EMI interference generates simultaneous pulses on the transmission lines of A and B or when pulses appear on line A and B within 30 uS microseconds of each other or at zero electrical phase The double pulses are rejected and are not counted by HIT 3 A momentary flash of the LED indicates double pulses Coil B Coil A Fig 3 Double pulse condition 3 2 3 Missing Pulse If pulses are missing fro
14. essage and responds with NUM PTS 20 lt CR gt HP 308 Appendix B Communications 21 Messages Commands Supported By Communications Messages Command Description Allowed Data Response DN Tag Number 0 to 99999999 TAG NUM DATA The first three digits are the units code for total Changing these digits will change the TU settings TU Total Units 100 for gallons 140 for liters 110 for cubic feet 150 for cubic meters 180 for barrels All other integer values from 0 and less than 999 will map to custom units TOT UNITS DATA DATA shall be GAL for gallons LIT for liters FT3 for cubic feet M3 for cubic meters BBL for barrels CUS for custom These three numbers will be the same as the first three digits of the tag number Changes to this menu shall cause the changes to the tag number NB Max Sample Time n 1 m to n 8 0 m MAX M TIME DATA CF Correction Factor 0 001 to 9999999 999 CORR FACT DATA HP 308 22 Appendix B Communications Command Description Allowed Data Response FM Rate Units 0 for seconds 1 for minutes 2 for hours 3 for days FLOW UNITS DATA DATA shall be SEC for seconds MIN for minutes HR for hours DAY for days
15. ice wishes to change a setting on the HIT 3 the sending unit shall follow the command with an equal sign with the data following immediately after the equal sign The carriage return terminates the message Any HIT 3 response that sends data back to the sending unit shall have an equal sign followed by the data Space is allowed between the equal sign and the data on the return message but the total message length is limited to 35 characters HP 308 20 Appendix B Communications READ Example If the sending unit wishes to read the number of points that the HIT 3 has in the K factor table the sending unit shall send NP lt CR gt The HIT 3 echoes the sent message and responds with NUM PTS 2 lt CR gt WRITE Example If the sending unit wishes to change the number of points to 20 in the K factor table the sending unit shall send NP 20 lt CR gt The HIT 3 echoes the sent message and responds with NUM PTS 20 lt CR gt The HIT 3 checks the ranges for data and rejects writes that are not within the allowed range If the sending unit sends data that is not within the allowed range the HIT 3 echoes the sent message and responds with the value that is currently stored in the HIT 3 Example If the sending unit wishes to change the max sample time to 2000 from the previous setting of 10 the sending unit shall send NP 200 lt CR gt The HIT 3 echoes the sent m
16. ion UNIT MODEL HIT2A XX YY ZZ Model and software number for the unit XX is the hardware revision number YY ZZ is the software revision where YY is the major software revision and ZZ is the minor software revision Dump All All of the responses in previous table The HIT 3 gives all responses except for the CL command Auto Data F DATA R DATA The response not the echo is sent every two seconds until it receives another message from the master The DATA following the F denotes the frequency of the pulses to a precision of three places past the decimal the DATA following the R denotes the rate to a precision of three places past the decimal PR Pulse Output Controlled By PS and FO Pulse Output Released The PS and FO menus shall control the pulse output Used to terminate the TP command HP 308 24 Appendix B Communications System Commands Supported by Communications Messages US Unit Status UNIT STAT lt DATA gt Requests the status The values for lt DATA gt with no or only one error present are o No Errors present 128 EPULSE error 0x080 129 ETOTAL error 0x081 130 ERATE error 0x082 132 EFLOW error 0x084 129 EERES error 0x088 EEPROM reset to factory defaults If multiple errors occur the error codes are logically OR ed For example if the unit has an ETOTAL and ERATE err
17. l frequency signal a pulse signal or a contact closure on the input and provide a linearized pulse output The HIT 3 s K factors frequencies and time base are fully configurable via the RS232 communications port The configuration and monitoring can be performed using any PC based communications program e g HyperTerminal or ASCII terminal The instrument is housed in a general purpose enclosure and can be mounted directly on a flowmeter Din Rail or wall mounted using optional mounting brackets or an EX enclosure This instrument has been designed to conform to the EMC Directive of the Council of European Communities 89 336 EEC and the following standards Generic Emission Standard EN 50081 1 Residential Commercial amp Light Industry Environment Generic Emission Standard EN 5008 1 2 Industrial Environment Generic Emission Standard EN 50082 1 Residential Commercial amp Light Industry Environment Generic Emission Standard EN 50082 2 Industrial Environment As of the date of publication of this document the instrument is undergoing compliance testing HP 308 2 Introduction 1 1 Model Number Designation MODEL HIT 3 C C ENCLOSURE STYLE LINEARIZED PULSE OUTPUT UP TO 20 POINTS INPUT POWER OPTIONAL PULSE SECURITY SPECIAL FEATURES ENCLOSURE STYLE MODEL HIT 3 OPTION 1 GENERAL PURPOSE 2 6 L X 2 6 H X 2 6 W MINIMUM MOUNTING SPACE D 2 LONG DIN RAIL MOUNT SI
18. m coil B HIT 3 continues to count pulses from coil A and operates like a system with no pulse security option Pulses missing from coil A are NOT counted by HIT 3 Pulses missing from either coil A or B are indicated by the LED Fora single missing pulse the LED flashes momentarily according to the width of the pulse If there is a group of pulses missing the LED stays ON until pulses appear again Coil B Coil A Fig 4 Missing pulse condition HP 308 10 Installation 4 INSTALLATION The HIT 3 has an input conditioning circuit which accepts signals from most frequency or pulse producing flowmeters The input will interface directly to Turbine Flowmeters Reed Switches Logic Signals Open Collector Outputs The input is protected for over voltage up to 50 volts The flowmeter input must be configured for the selected signal type by the input selection resistors found on the HIT 3 signal input circuit 4 1 Typical Input Connections MAG COIL A A SIG A SIG OPTICALLY ISOLATED OUTPUT OUT OUT R1 3 3 K 1 2W b i VDC IN IN VDC VDC CUSTOMER POWER SUPPLY DES 5 30 VDC SINGLE COIL INSTALLATION HP 308 COIL A OPTICALLY ISOLATED OUTPUT Installation 11 B SIG B SIG A SIG OUT OUT DC ow OF tl MAG COIL INSTALLATION W PULSE SECURITY REDI PULSE COIL
19. or occurring at the same time the lt DATA gt 131 0x83 CS Clear Status Status Cleared Clears all errors HP 308
20. ortation If Purchaser does not respond within thirty 30 days after notice from HFC the goods will be disposed of in HFC s discretion HFC does not warrant the product to meet the requirements of any safety code of any state municipality or other jurisdiction and Purchaser assumes all risk and liability whatsoever resulting from the use thereof whether used singlely or in combination with other machines or apparatus This warranty shall not apply to any HFC product or parts thereof which have been repaired outside HFC s factory or altered in any way or have been subject to misuse negligence or accident or have not been operated in accordance with HFC s printed instructions or have been operated under conditions more severe than or otherwise exceeding those set forth in the specifications FOR NON WARRANTY REPAIRS OR CALIBRATIONS consult HOFFER FLOW CONTROLS for current repair calibration charges Have the following information available BEFORE contacting HOFFER FLOW CONTROLS 1 P O number to cover the COST of the repair calibration 2 Model and serial number of the product and 3 Repair instructions and or specific problems relative to the product HFC 9907 CONTENTS 1 Introduction 1 1 1 Model Number Designation 2 2 Specifications 3 2 1 Gene
21. put number of pulses and the output frequency are very close to the input number of pulses and the input frequency The difference is determined by the ratio of the actual K factor at the flowing frequency to the averaged K factor stored in the HIT 3 The number of output pulses has to be an integer number and therefore any fraction that results from the calculations is added to the next one second period As a result even at steady flow the number of output pulses may fluctuate 1 pulse The output pulses are delayed by one second with respect to the input flow they are representing When flow stops the output continues sending pulses for about one second until all calculated pulses have been sent 3 1 Functional Blocks The HIT 3 consists of four functional blocks These functional blocks are the Preamplifier Microcontroller Pulse Output and Communications Interface Flowmeter Input Preamp Microcontroller a Pulse Output RS232 Communications Interface HP 308 3 1 1 Theory of Operation 7 Preamplifier The Preamplifier accepts the input from the flowmeter The Preamplifier applies amplification low pass filtering and wave shaping to the input signal The wave shaping function converts the signal into a square wave before sending it to the Microcontroller 3 1 2 Microcontroller 3 1 3 The Microcontroller accepts the square wave output
22. ral 3 2 2 Inputs 3 2 3 DC Power 3 2 4 AC Power 4 2 5 Physical 4 3 Theory of Operation 6 3 1 Functional Blocks 6 3 1 1 Preamplifier 7 3 1 2 Microcontroller 7 3 1 3 Pulse Output 7 3 1 4 Communications Interface 7 3 2 Pulse Security 8 3 2 1 Normal operation 8 3 2 2 Double pulse condition 9 3 2 3 Missing Pulse 9 4 Installation 10 4 1 Typical Input Connections 10 4 2 Communications Connections 12 4 3 Wiring 13 4 4 Terminal Designations
23. rizes the meter The unit goes into a low power state to conserve power if the flow is stopped 6 2 Maintenance The HIT 3 does not require any routine maintenance In the case that the HIT 3 does fail to operate maintenance should only be performed by a qualified technician HP 308 Appendix A Default Configuration 17 APPENDIX A DEFAULT CONFIGURATION Factory Default Settings FIELD Value DN 10000000 AF 99 999 CF 1 000 AK 1 00 LF 00000 000 AL 99999 981 ST 00000 000 NB 01 NP 20 PA 1234 TU 100 GAL FM 1 MIN FC 0 Average KD 3 TD 1 RD 3 PS 0 OFF FO 8 LK No UA Off F01 4999 981 F02 4999 982 F03 4999 983 F04 4999 984 F05 4999 985 F06 4999 986 F07 4999 987 F08 4999 988 F09 4999 989 F10 4999 990 F11 4999 991 F12 4999 992 F13 4999 993 F14 4999 994 F15 4999 995 F16 4999 996 F17 4999 997 F18 4999 998 F19 4999 999 HP 308 18 Appendix A Default Configuration FIELD Value F20 5000 000 KO1 1 00 K02 1 00 K03 1 00 K04 1 00 K05 1 00 K06 1 00 K07 1 00 K08 1 00 K09 1 00 K10 1 00 K11 1 00 K12 1 00 K13 1 00 K14 1 00 K15 1 00 K16 1 00 K17 1 00 K18 1 00 K19 1 00 K20 1 00 HyperTerminal Response HOFFER FLOW CONTROLS INC HIT 3 c 2001 Ver 0 05 To read setting enter command followed by
24. rnal Pull up DC Power Voltage Current Protection 10 Hz to 3500 Hz DC pulse 4 to 30 VDC lt 1 VDC 0 5 mA 0 4 VDC 0 1 msec 10 Hz to 3500 Hz Contact closure to DC common Open or 4 to 30 VDC lt 0 5 VDC 220 KQ to 3 3 VDC 5 to 30 VDC lt 4mA Reverse polarity protected HP 308 4 Specifications 2 4 AC Power Voltage Frequency Current Protection 2 5 Physical Temperature Humidity Packaging HP 308 100 to 240 VAC 47 440 Hz 150 mA Short circuit Over voltage amp Over temperature Operating 22 F 30 C to 158 F 70 C 32 F 0 C to 140 F 60 C with AC power option 0 90 Non condensing General Purpose Din Rail amp Explosion proof Specifications 5 This page intentionally left blank HP 308 6 Theory of Operation 3 THEORY OF OPERATION The HIT 3 reads input frequency once every second Based on the input frequency the turbine K factors stored in the memory and the number of pulses received during the last second the HIT 3 calculates the incremental volume of fluid that flowed through the turbine during the last second The volume is then multiplied by the stored average K factor to determine the number of output pulses The calculated number of pulses is sent to the output in a burst beginning at the start of the next second The frequency of the burst is scaled such that all pulses are output during the one second period Typically the out
25. roceed to Section 6 to continue installing the HIT 3 HP 308 16 Operation and Maintenance 6 OPERATION AND MAINTENANCE 6 1 Operation To begin operation the HIT 3 must be programmed with the calibration data of the appropriate meter The calibration data consist of the number of points NP Frequency F K Factor F and the Average K Factor AK If the meter and HIT 3 were purchased from Hoffer Flow Controls it has already been programmed and is ready for use By following the procedures outlined in section 4 2 and 5 2 or 5 3 you can check the device to see if it has been programmed After insuring that the HIT 3 is programmed it is ready to be installed Connect the flow meter or suitable pulse producing device to the HIT 3 signal input terminals A SIG and A SIG If you have purchased the pulse security option the second meter will need to be connected to the signals labeled B SIG and B SIG Refer to section 4 for the installation drawings of several common applications If you have a special application or are unsure of the proper wiring configuration please contact Hoffer Flow Controls for assistance The signal input circuit was configured at the factory by using the appropriate internal resistors If you decide to change the input signal please consult the factory Once properly wired the operation of the HIT 3 is automatic The flow rate is calculated every second and a pulse train is produced that linea
26. uration program see the HIT 3 Windows Configuration Program manual 5 3 Remote Configuration Establish communications with the HIT 3 via the RS232 interface by using the steps outlined in section 4 2 Follow the steps outlined below Refer to Appendix B for the communications details 1 Type DA lt cr gt 2 Observe the data displayed on the pc It should match the calibration data of the meter 3 Ifit does proceed to section 6 and continue installing the device for operation 4 Ifthe data displayed on the pc resembles that in Appendix A you will need to configure the HIT 3 for operation 5 Enter the following data into the HIT 3 by typing the following commands a FM 0 lt cr gt b FC l lt cr gt c KD 3 lt cr gt d AR XXXX XXX lt crm gt XXXX XXX is the average K Factor Value determined form the calibration data e TU XX0 lt cr gt XX0 is the volume unit f NP XX lt cr gt XX is the number of data points in you calibration The range is 02 20 g FOI XXXX XXX lt cr gt This is the lowest frequency value in your calibration data HP 308 Configuration 15 h K01 XXXX XXX lt cr gt This is the K Factor value that was determined at the frequency value in F01 NOTE Continue entering frequencies and K Factors until you have entered as many frequencies and K Factors as you have Number of Points NP 6 The HIT 3 is now configured and ready for use P
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