Teledyne LXT-220 Oxygen Equipment User Manual
Contents
1. 3 Clean the electrode and insert the sensor into the desired buffer 4 Press both horizontal CALIBRATE keys simultaneously to enter the calibrate mode Observe the diagnostic value on the bottom line change from historical data to a real time value and that the term CAL has disappeared 5 To change the buffer point position the cursor under the desired digit using the left hand CALIBRATE key 6 Increase or decrease the value by pressing the appropriate vertical CALIBRATE key 7 Wait for the real time mV value to stabilize 8 save the calibration and exit the calibrate mode press either MENU SELECTION key A perfect electrode slope efficiency 15 typically greater than 150 mV FS If the value falls below 100 0 mV FS the electrode should be serviced or replaced 3 4 2 3 Two PoINT BUFFER CALIBRATION SPAN When first installing an electrode the second cal point establishes the slope variations or efficiency The span is typically done in air which is the saturation point of the solution when in equilibrium 2DO 8 40 ppm Cal 173 8 mV FS Span calibration menu pH Procedure 1 Perform a one point calibration as outlined in Section 3 4 2 2 2 Press the appropriate MENU SELECTION key to reach the Electrode Span Menu and locate the cursor under the 2 as illustrated Teledyne Analytical Instruments 47 Operation LXT 220 DO EPAECMPPTIATR2. CC RQ g 3 For diagnostic reasons note the DO and mV FS values from the prior calibration 4 Press both horizontal CALIBRATE keys simultaneously to enter the calibrate mode Observe the diagnostic value on the bottom line becomes a real time value and that the term CAL has disappeared 5 To change the buffer point position the cursor under the desired digit using the left hand CALIBRATE key 6 Increase or decrease the value by pressing the appropriate vertical CALIBRATE key 7 Wait for the real time mV value to stabilize 8 To file the calibration and exit the calibrate mode press either MENU SELECTION key A perfect electrode slope efficiency 15 typically greater than 150 0 mV FS If the value falls below 100 0 mV FS the electrode should be serviced or replaced IMPORTANT Ifa flashing asterisk appears during or after calibration the electrode may require service or the buffer solution may be contaminated Note Comparing the millivolt values before and after the calibration provides a valuable diagnostic tool in determining the degradation of the electrode Large differences between calibrations may indicate coating or damage to the measurement half cell 3 4 2 4 CALIBRATION USING A GRAB SAMPLE AS A STANDARD The LXT 220 allows easy standardization to a grab sample value by placing the process value into the first calibration point Procedure 1
3. Trim C 0 Unit 25 0 C Calihratian Teledyne Analytical Instruments 40 Dissolved Oxygen Controller Operation The bottom line shows the measured temperature To change the displayed temperature so it agrees with a measured value place the cursor on the top line then simultaneously depress both CALIBRATE lt P keys Use the right side CALIBRATE keys to adjust the number so that the displayed temperature agrees with that measured by a thermometer The number shown on the top line is simply added to the temperature that the instrument measures There is no slope correction To toggle between degrees C and degrees F place the cursor on the bottom line and simultaneously depress both CALIBRATE lt keys This will change the unit Press both keys again to toggle back to the original unit All temperature displays on both channels use the selected system of units The scale and units code in the HART temperature output is also controlled by this selection On two channel instruments the next display trims the channel 2 temperature 3 3 7 4 20 Trim The next six displays are used to trim the 4 20 outputs The 4 20 outputs are calibrated at the factory and will never need recalibration in most applications Periodic recalibration is not recommended 1 trim 000 4 to 20 mA trim As in the other menus the cursor moves to the right when both CALIBRATE keys are dep
4. Dissolved Oxygen Controller Operation i RC RR A HART analog 2 HART analog 3 HART analog 4 The next three displays assign the second third and fourth variables The assignments are changed in the same way as for the 4 20 outputs See Section 3 3 2 4 20mA Output Assignments It is not possible to assign more than one HART digital output to the same source The current selection will be preceded by a symbol on the display if making it permanent would result in duplication HART analog 5 4 20 output Z4 is dedicated to HART This output normally carries the digital information superimposed on the 4 20 mA current But if the HART system uses the multi drop mode then the current output of 4 20 5 1s disabled with only the digital signal remaining Several instruments are connected in parallel in the multi drop mode so analog signaling is not possible The current that would have been output is still reported digitally as a percentage and that will be sufficient for some applications But if an actual 4 20 current is required then one of the other 4 20 outputs must be used to supply it and this display is used to make the assignment The specified 4 20 must in turn be assigned to an appropriate source Note If the HART analog output is assigned to an output other than 5 then 5 cannot be assigned to anything It must be set to missing or unused The span settings for the select
5. Resistivity conductivity pH e Oxidation Reduction Potential Specific Ion For process control the microprocessor based LXT 220 Transmitter employs a multi bus system architecture for PID temperature control and sensor specific process variable outputs such as DO pH ORP Resistivity Conductivity and ion specific element ISE output as a function of multiple inputs Up to six field configurable alarm or control relay outputs are available to the user to match individual process needs These relays can be field configured as high or low alarms Hysterisis dead band is defined by setting the ON and OFF relay values These relays can be configured to any of the input parameters See Section 3 3 5 Teledyne Analytical Instruments 13 Introduction LXT 220 DO TOD The LXT 220 can be upgraded with pre pHault Diagnostics amp HART Communications option which alerts the operator to a pending DO pH ORP or ISE electrode failure The LXT 220 is housed in a rugged NEMA 4X housing with all operator switches conveniently located on the front panel 1 2 Main Features of the Transmitter The LXT 220 Controller for dissolved oxygen applications incorporates the following standard features Front panel membrane switches Menu driven backlit display with contrast adjustment e Automatic Calibration This allows calibration points to be defined upon initialization of the transmitter e An easy back to factory
6. ch temp Channel 1 temperature ch1 PID Channel 1 PID controller output ch2 PV Channel 2 process value ch2 temp Channel 2 temperature ch2 PID Channel 2 PID controller output The channel 2 options are only shown on two channel instruments and specialized instruments may show additional options To change the output assignment first push both CALIBRATE gt keys causing the cursor to move to the right Then use the right side CALIBRATE A V keys to scroll through the list of options The list is Teledyne Analytical Instruments 35 Operation LXT 220 DO EPAECMPPTIATR CC RQ g cyclic Use either of the MENU SELECT A V keys to accept the selection and move the cursor back to the left The displayed selection remains in effect until changed and the selection is remembered through power outages of indefinite length Up to two 4 20 outputs can be assigned to the same source There is no error indication if more than two are assigned to the same source but there will be no span display for the third A span display will otherwise be present in the main menu for each 4 20 output that is assigned to a source If the source is associated with channel 2 then the span display will be in the channel 2 group The new assignment is not functional until the setpoints in the span display are set If a PID controller is selected as a source then its suppo
7. OPERATING INSTRUCTIONS FOR LXT 220 Dissolved Oxygen Controller DO 8 25 ppm 82 5 25 1 _ CALIBRATE ba 4 Teledyne Analytical Instruments P N Mxxxxx ECG mur A Toxic gases and or flammable liquids may be present in this monitoring system Personal protective equipment may be required when servicing this instrument Hazardous voltages exist on certain components internally which may persist for a time even after the power is turned off and disconnected Only authorized personnel should conduct maintenance and or servicing Before conducting any maintenance or servicing consult with authorized supervisor manager Teledyne Analytical Instruments LXT 220 DO Copyright O 2005 Teledyne Instruments Analytical Instruments Rights Reserved No part of this manual may be reproduced transmitted transcribed stored in a retrieval system or translated into any other language or computer language in whole or in part in any form or by any means whether it be electronic mechanical magnetic optical manual or otherwise without the prior written consent of Teledyne Instruments Analytical Instruments 16830 Chestnut Street City of Industry CA 91749 1580 Warranty This equipment is sold subject to the mutual agreement that it is warranted by us free from defects of material and of construction and that our liability shall be limited to replacing or repairing a
8. 35 36 38 40 40 41 42 43 44 44 45 46 46 47 48 49 49 51 51 51 51 53 53 vii LXT 220 DO A 4 Model Designation 55 Index QU CLE CDS 59 Teledyne Analytical Instruments viii Dissolved Oxygen Controller List of Figures Figure 1 1 LXT 220 Front Partel eecoo epi e bestes kien 16 Figure 1 2 Internal Layout of the LXT 220 DO Controller 17 Figure 2 1 Opening the Front 20 Figure 2 2 LXT 220 Electrical Connections 21 Figure 3 1 Available Menus and Submenus 25 Figure 3 2 Numerical Entry Using Front Panel Keys 32 Teledyne Analytical Instruments ix LXT 220 DO List of Tables Table 3 1 Protection Level 33 Table 4 1 Troubleshooting 2 2 c eeeeeeeeeeeeneeeeececeeeeeseeeeeeneees 52 Teledyne Analytical Instruments x Dissolved Oxygen Controller This is a general purpose instrument designed for liquid measurements in a non hazardous area It is the customer s responsibility to ensure safety especially when hot or flammable liquids are being analyzed since the potential of leaks always exist The customer should ensure that the principles of operating this equipment are well understood by the user Misuse of this product in any manner tampering with i
9. An option is available for an internally generated 24VDC powered instrument The instrument is configured at the factory for the customer s application and so there are many different model designators The following codes will help in identifying a specific instrument configuration Base Model LXT 220 LXT 220 controller Channel 1 Input PH pH ORP Oxidation Reduction Potential REDOX DO Dissolved Oxygen specify ppm PION Specific ion CDL Conductivity Low range 20uS or less Conductivity High range 50uS to 50mS CDT Conductivity Toroidal electrodeless greater then 50mS RS Resistivity 0 to 50 megohms Channel 2 Input PH pH ORP Oxidation Reduction Potential REDOX DO Dissolved Oxygen specify ppm or PION Specific ion CDL Conductivity Low range 20uS or less Conductivity High range 5005 to 50mS CDT Conductivity Toroidal electrodeless greater then 50mS RS Resistivity 0 to 50 megohms Teledyne Analytical Instruments 55 Appendix LXT 220 DO ieee _ _ Channel 3 Input Input from an external 4 to 20mA device EX1 Input from an external relay contact device Sentinel Diagnostic DIAGISentinel Diagnostic on channel 1 DIAG2Sentinel Diagnostic on channel 2 Number of 4 to 20 mA Outputs One 4 to 20mA Current Output 2mA Two 4 to 20mA Current Outputs 3mA Three 4 to 20mA Current Outputs 4mA Four4 to 20mA Current Outputs 5mA Five 4 to 20mA Current
10. Operation LXT 220 DO EPAECMPPTIATR CC RQ g displays for them in the setup section and they can be used for alarm purposes or otherwise The bottom line of the display will identify the relay as being assigned to a PID output and it will also show what the input to the PID processor is assigned to A 0 relay setpoint refers to the minimum PID output which corresponds to a current of 4 mA on any current loops assigned to the PID and a 100 setpoint corresponds to a 20 mA current When 4 20 mA outputs are assigned to a PID output it is helpful to assign one of the manual mode displays Section 3 3 3 to one of the them so that the percent output of the controller will be visible in the operational displays See Section 3 5 Proportional Control Setup and Configuration for configuring and setting up the optional PID control feature 3 4 Calibration Calibration involves performing either a one point standardization calibration or two point span calibration These choices are available after choosing BUFFER from the Parameter Selection Menu 3 4 1 Manual Output Mode In order to perform calibrations without interfering with control or recorder functions the LXT 220 incorporates a manual output mode In the manual output mode the current output is set to the desired level and saved until changed or released from the manual mode On LXT 220s with the o
11. 2 3 1 AC Power 2 3 2 Sensor Wiring 2 4 Configuring the LXT 220 2 5 Calibration EUNT 3 1 Using the Front Panel Keys 3 1 1 Menu Selection Keys 3 1 2 Calibrate Keys 3 2 Menus 3 2 1 Contrast 3 2 2 Main Menu 3 2 3 Output Graph 3 2 4 Parameter Selection Menu 3 2 4 1 Calibration Submenu Teledyne Analytical Instruments vi Dissolved Oxygen Controller 3 2 4 2 Setup Submenu 3 2 4 3 Status Menu 3 2 4 4 Exit Stay Menu 3 3 Configuring the LXT 220 3 3 1 Password Protection 3 3 1 1 Changing Protection Level 3 3 1 2 Changing Operational Password 3 3 1 3 Changing Configuration Password 3 3 2 4 20 mA Output Assignments 3 3 3 Manual Mode Assignment 3 3 4 HART Output Assignments 3 3 5 Relay Assignments 3 3 6 Temperature Calibration 3 3 7 4 20 Trim 3 3 8 Input A D Converter Trim 3 3 9 PID Assignments 3 4 Calibration 3 4 1 Manual Output Mode 3 4 2 Parameter Selection Menu 3 4 2 1 Buffer Menu 3 4 2 2 One Point Buffer Calibration Standardize 3 4 2 3 Two Point Buffer Calibration Span 3 4 2 4 Calibration Using a Grab Sample as a Standard 3 4 2 5 Calibration Error Detection amp Electrode Operational Guidelines 3 4 2 6 Back to Factory Calibration ec LT 4 1 Routine Maintenance 4 1 1 Cleaning 4 1 2 Replacement of the Microprocessor Face ta dau A 1 Specifications Teledyne Analytical Instruments 28 29 30 30 31 33 33 34
12. 82 5 25 1 S MESS nalytical Instruments Figure 1 1 LXT 220 Front Panel Teledyne Analytical Instruments 16 Dissolved Oxygen Controller Introduction DE ARCU CRM A M M NR 1 5 Internal Connections All user connections are made inside the unit on removable terminal blocks Two conduit holes are provided on the NEMA 4X housing one for low level DC signal and the other for 115VAC power wiring Access to the terminal blocks 15 gained after removing the 4 captive jackscrews on the front of the instrument Figure 2 shows the internal layout ofthe LXT 220 Controller A label on the enclosure cover shows the terminal block arrangement for all the wiring along with the model number and the factory assignment of the output signals These can be changed in the field if the application prefers a different arrangement Figure 1 2 Internal Layout of the LXT 220 DO Controller Teledyne Analytical Instruments 17 Introduction Teledyne Analytical Instruments LXT 220 DO 18 Dissolved Oxygen Controller Installation Installation Installation of the LXT 220 Controller involves e Unpacking the instrument Mounting Making Electrical Connections Configuring the Instrument Calibration 2 1 Unpacking the Instrument The LXT 220 Controller has been carefully packaged to protect it from damage during shipment and dry storage Upon receipt please follow the proced
13. Assignments The next 8 displays are for the relay assignments The first of the relay displays is Relay 1 Where represents an item from the same list that is used for the 4 20 assignments The procedure for selecting a relay assignment is the same as for the 4 20 outputs See Section 3 3 2 4 20mA Output Assignments Up to two relays can be assigned to the same source so one relay can be used to control the process and another relay can be used as an alarm if the process value is out of limits The relay configuration menu provides for 8 relays but most units do not have that many relays installed Some units do not have any relays installed but the relay menu will nevertheless be present as the relays can be retrofitted The software cannot determine how many relays are actually present so the missing selection might not reflect the actual configuration A display showing the relay setpoints for each relay 15 present in the main menu Ifthe relay is assigned to a channel 2 function then the display will be in the channel 2 group The display is not shown if the missing or unused selection is made A new relay assignment is not necessarily functional until the setpoints in the span display are set If a PID controller is selected as a source then its support displays will also be present 3 3 6 Temperature Calibration The next display is for calibrating the process temperature displayed by the instrument
14. Record the value of the process when the sample is extracted 2 Record the value of the grab sample 3 Calculate the difference between the two values as follows Grab sample value Displayed value differential Teledyne Analytical Instruments 48 Dissolved Oxygen Controller Operation RC A s C 4 Immediately before making the calibration adjustment note the current value on the display and add the differential to the current value This total adjusted value is entered as the buffer value 3 4 2 5 CALIBRATION ERROR DETECTION amp ELECTRODE OPERATIONAL GUIDELINES If the slope calibration performed in Section 3 4 2 3 1s not within the predetermined limits of the instrument a flashing asterisk will appear The presence of the asterisk indicates a potential calibration problem In general if the asterisk appears the integrity of the electrode the buffer solutions or the handling procedure should be questioned See the dissolved oxygen sensor manual for specifics on the electrode 3 4 2 6 BACK TO FACTORY CALIBRATION This feature allows the LXT 220 to be reset to typical electrode for electrode potentials As the electrode ages it will deteriorate and the mV FS will decay and will eventually require replacement If the membrane is torn or coated the calibration will be either sluggish or out of range The following procedure for returning the LXT 220 t
15. calibration 14 22 49 backlit graphics display 57 BUFFER 27 44 46 CALIBRATE key 16 23 numerical equivalence 31 calibrate mode 23 calibration 22 44 calibration menu 27 calibration voltage 42 caution sign iv change the protection level 33 changing output assignment 37 cleaning 51 command 3 38 command 35 39 concentration curves 54 conductivity 13 14 53 conduit 21 conduit hole 17 configuration password See password CONFIGURE TRIM 30 configuring LXT 220 30 connections 17 contrast 52 contrast menu 24 25 copyright ii copyright display 24 cross channel assignment 37 Index current output 26 configure 28 decreasing a value 16 dedicated output 39 default parameters 14 diagnostic feature 59 digital interface 54 digital signal 39 dimensions 54 display 14 16 53 display contrast 25 dissolved oxygen 13 14 24 53 dissolved oxygen electrode 46 dual channel input 22 dual input See input dual input option 13 efficiency 47 electrical connections 20 electrode 29 electrode degradation 22 46 electrode diagnostic screen 29 electrode failure 14 electrode performance 29 electrode potential 22 electrode slope 47 48 electrode variation 46 enclosure See NEMA 4X Err PW 32 erratic reading 52 error detection 49 EXIT STAY MENU 30 external event 53 factory calibration point 22 feature codes 57 features 14 figures listing ix flashing asterisk 49 front panel 1
16. calibration menu allows the instrument to return to a predetermined factory calibration The default parameters are zero electrode offset and 157 5mV FS slope e 4 20mA current output fully expandable to any range within the transmitter s full operating range The output is field selectable and fully programmable The current output can be configured to be reverse acting Temperature Conversion Temperature can be displayed in either Fahrenheit or Celsius The units can be toggled from one to the other in the field with the conversion calculation performed automatically 1 3 Optional Features The Model LXT 220 DO Controller is a versatile instrument designed to meet the needs for liquid analytics and process control across a wide range of applications There are many options available for the transmitter including Dual Input An optional second input can be provided for pH ORP resistivity conductivity or Specific Ion The second input can also be used as a second analysis for dissolved oxygen or as specific compensation for the primary input Teledyne Analytical Instruments 14 Dissolved Oxygen Controller Introduction DE ARCU CRM A M M NR Note PID Output An optional PID output is available and provides a 4 20 mA three mode control signal Proportional band is adjustable from 0 1 to 1 000 Reset and Rate are adjustable from 0 00 to 100 repeats per minute and 0 00 to 1 000 minutes respectively Th
17. pressing the appropriate vertical CALIBRATE key 5 save the contrast value and exit the calibrate mode press either MENU SELECTION key 3 2 2 Main Menu This menu appears after the copyright display when power is first applied to the LXT 220 The MAIN MENU displays the measured process variable temperature and the current output in percent of full scale While in this menu the current output can be adjusted and locked in a manual mode to provide an undisturbed output during sensor calibrations The screens below are for a two channel instrument To access the following menus in a two channel instrument scroll down for channel 1 and scroll up for channel 2 For a single channel instrument scrolling down accesses all menus 2DO 8 40 20RP 500 84 000 25 0 _ 50 0 25 0 C 1DO 9 28 92 89 25 0 Main Menu pH Main Menu ORP 3 2 3 Output Graph This screen graphically displays the output current that is set up in the Main screen The X axis of the graph display is factory set to 150 samples 15min 6 sec 1min sample The setup screen sets the Y axis the sensitivity If the graph were assigned to a current output the sensitivity would be that of the 4 to 20 mA output Teledyne Analytical Instruments 26 Dissolved Oxygen Controller Operation Graph 3 2 4 Parameter Selection Menu Buffer Setup Status Parameter Selection Menu This menu allows you to select what funct
18. range is 600 millivolts but ORP and some specific ion units use a 1200 millivolt range On conductivity units the analog voltage is not externally accessible but conductivity systems do not have millivolt displays so no calibration is required On conductivity units this display is only used for factory testing The input scale factor is calibrated at the factory and will never need recalibration in normal applications Periodic recalibration is not recommended as most units will remain accurate to within about 0 2 percent for many years Further any inaccuracy in the displayed millivolts is calibrated out when buffer calibrations are performed so there is no requirement that the displayed millivolts be highly accurate If the scale is accidentally changed and it is not convenient to perform a voltmeter calibration then simply set the scale factor to 1 0000 Most units are accurate to 2 percent with that setting which is adequate for most applications Teledyne Analytical Instruments 42 Dissolved Oxygen Controller Operation i RC RR A On two channel units the next and last display is for trimming the channel 2 analog input 3 3 9 PID Assignments Two independent Proportional Integral Derivative PID controllers are available as options on all instruments including one channel units The sub menu for assigning the controller inputs is PID A PID B Where r
19. using either a one point buffer calibration standardization or two point span calibration There is also a Back to Factory calibration feature which resets the LXT 220 to typical electrode for electrode potentials As the electrode ages it will deteriorate and the mV FS will decay and eventually require replacement If the membrane is torn or coated the calibration will be either sluggish or out of range This feature restores the instrument to the predetermined factory calibration point of zero electrode offset and 157 5 mV FS quickly The calibration routines require a familiarity with the instrument operation and is described after fundamental operational parameters are discussed in Section 3 Teledyne Analytical Instruments 22 Dissolved Oxygen Controller Operation Operation No one instrument has all the options described in this document Some options must be specified at the time the instrument is purchased and are not field alterable The instrument can be returned to the factory for re programming if your requirements change 3 1 Using the Front Panel Keys Cursor positions or numeric adjustments are performed by pressing the appropriate keypad The LXT 220 uses an underscore cursor in each of the menus Holding down the keypad will automatically scroll the cursor or numeric values Note Simultaneous pressing both vertical keys or any combination of keys other than the two horizontal CALIBRATE keys is not r
20. 15 floating 15 graphic display 26 isolated 15 multiple 15 PID 15 43 54 ratio 15 signal factory assignment 17 output configuration options 60 oxidation reduction potential See ORP panel mounting 20 parameter selection menu 27 45 password 31 54 configuration 34 operation 33 percent output display 37 pH 14 53 PID 13 15 28 36 40 43 minimum output 44 PID assignment 43 plot function 28 power 17 21 53 pre pHault diagnostics 14 primary variable 38 probe 13 process control 13 40 process variable display 26 proportional band 15 protection level 32 34 question mark 36 37 43 rate 15 relay 15 29 54 configure 28 relay assignment 40 relay configuration menu 40 relay output 13 Teledyne Analytical Instruments 60 Dissolved Oxygen Controller relay setpoints 40 release manual output 45 repeatability 53 reset 15 resistivity 13 14 53 response time 53 restore password 32 reverse acting 13 14 routine maintenance 51 RS232 53 safety information iv saturation point 47 scale factor 42 sensitivity 53 sensor SP1 amp SP2 21 sensor orientation 52 sensor wiring 22 serial number iii 24 SETUP 27 28 46 shipping damage 19 slope variation 47 software 15 software version 24 span calibration 22 44 span display 36 span setting 39 specific compensation 14 specific 1on 13 14 42 53 specifications 53 stability 53 standardization 22 44 46 Ind
21. 6 gasket 51 grab sample 48 gray screen 25 HART 14 15 28 36 38 40 53 54 HART analog output 39 Teledyne Analytical Instruments 59 Index LXT 220 DO HART assignment 38 39 hysteresis 15 hysterisis 13 impedance 54 incrementing a value 16 input 13 27 conditioned 21 dual 14 input range 42 installation 19 internal clock 54 internal layout 17 internal power supply 15 isolation 53 keyboard control 37 LCD See display linear 28 linearity 53 locus 29 low level DC signal 17 main menu 24 26 manual mode 26 37 manual mode assignment 37 manual output mode 22 36 44 manuals additional v measurable parameter 22 membrane 22 49 membrane switche See switch menu options 24 MENU SELECT key 16 23 menus 24 microprocessor 13 microprocessor replacement 51 missing assignment 36 model designation 57 mounting bracket 20 mounting plate handrail 20 universal 19 multi bus architecture 13 multi drop mode 39 NEMA 4X 57 NEMA 4X 14 17 20 53 no display 52 noise filter 29 noise rejection 54 non linear reading 52 numeric adjustments 16 23 one point calibration 22 one point calibration 44 46 opening the front panel 20 operating temperature 54 operation 23 operational password 32 options 14 ORP 14 22 42 53 output 13 28 analog 53 assignment 35 averaged 15 configure 28 correspondence 22 current 14 36 54 current adjust 26 dirrerential
22. ART ASSIGN Scroll down to the item of interest and then simultaneously depress the 4 and gt keys to access the sub menu for that item 3 3 1 Password Protection It is worthwhile to become familiar with the password capabilities of the instrument even if you decide not to use them as it 1s possible that one gets set by mistake and you need to change or erase it Password protection can be selectively turned on for the operational and configuration displays The operational and configuration passwords can be different Passwords are entered using only the right four keys and the passwords are numbers consisting only of the digits 1 to 4 No digits are shown on the keyboard It is necessary to remember that the top key 15 1 the right key 15 2 the bottom key is 3 and the left key is 4 See Figure 3 2 DO 8 25 ppm 82 5 25 4 Teledyne Analytical Instruments Teledyne Analytical Instruments 31 Operation LXT 220 DO EPAECMPPTIATR CC RQ g Figure 3 2 Numerical Entry Using Front Panel Keys After successfully entering the operational password it remains valid for 60 seconds after exiting the calibration mode on that display During that time a second display can be accessed without re entering the password The 60 second timer starts again when exiting the cali bration mode on that display also so that any number of operation
23. HIS MANUAL Teledyne Analytical Instruments iv Dissolved Oxygen Controller IF YOU USE THE ANALYZER IN A MANNER OTHER THAN THAT FOR WHICH IT WAS INTENDED UNPREDICTABLE BEHAVIOR COULD RESULT POSSIBLY ACCOMPANIED WITH HAZARDOUS CONSEQUENCES This manual provides information designed to guide you through the installation calibration operation and maintenance of your new process controller Please read this manual and keep it available Occasionally some instruments are customized for a particular application or features and or options added per customer requests Please check the front of this manual for any additional information in the form of an Addendum which discusses specific information procedures cautions and warnings that may be peculiar to your instrument Manuals do get lost Additional manuals can be obtained from TI AI at the address given in the Appendix Some of our manuals are available in electronic form via the internet Please visit our website at www teledyne ai com Teledyne Analytical Instruments LXT 220 DO Table of Contents BIIESHIDI I Mns i List OF Tables cH M aldere loroo a 1 1 Overview 1 2 Main Features of the Transmitter 1 3 Optional Features 1 4 Front Panel 1 5 Internal Connections Installation Beer 2 1 Unpacking the Instrument 2 2 Mounting 2 3 Electrical Connections
24. Outputs 6mA Six 4 to 20mA Current Outputs Hart HT Hart protocol option Type of relay contacts SS SOLID STATE 240VAC 3amp Form C SPDT Number of relay contacts 2 Two relay contacts 4 Four relay contacts 6 Six relay contacts 8 Eight relay contacts Mounting hardware UM Universal mounting plate PM Panel mounting hardware HM Handrail mounting plate including 2 hardware Teledyne Analytical Instruments 56 Dissolved Oxygen Controller Appendix Optional power requirements PSI PS2 PS3 Standard powered by 120VAC 24 VDC internally generated to power the 4 to 20 mA output cards LXT 220 controller powered by 24 VDC Special options F2 Output function of dual inputs ratio free chlorine differential average SPECIFY 9o0C Percent 90 ion concentration display only PA AV 1 2 LG PT PID TPC GO2 Available for Conductivity only Signal conditioner mounted inside transmitter enclosure Field selectable time average 2 to 32 seconds Periodic timer One Shot timer Logic Gates Field configurable Special temperature input from sensor 1000 ohm pt 3 mode proportional control Time Proportional Control Requires 2 solid state relay contacts Gaseous Oxygen O2 For options not listed consult factory for price and availability ok Diagnostic Feature is only available on ORP and Pion If the diagnostic option is selected the sensor and electr
25. afety and the safety of others is very important We have provided many important safety messages in this manual Please read these messages carefully A safety message alerts you to potential hazards that could hurt you or others Each safety message is associated with a safety alert symbol These symbols are found in the manual and inside the instrument The definition of these symbols is described below GENERAL WARNING CAUTION Refer to the instructions for details on the specific danger These cautions warn of specific procedures which if not followed could cause bodily Injury and or damage the instrument CAUTION Hor SURFACE WARNING This warning is specific to heated components within the instrument Failure to heed the warning could result in serious burns to skin and underlying tissue WARNING ELECTRICAL SHOCK HAZARD Dangerous voltages appear within this instrument This warning is specific to an electrical hazard existing at or nearby the component or procedure under discussion Failure to heed this warning could result in injury and or death from electrocution Technician Symbol All operations marked with this symbol to be performed by qualified maintenance personnel only NOTE Additional information and comments regarding a specific component or procedure are highlighted in the form of a note No Symbol CAUTION THE ANALYZER SHOULD ONLY BE USED FOR THE PURPOSE AND IN THE MANNER DESCRIBED IN N T
26. al displays can be modified with a single password entry If the wrong password is entered three consecutive times in accessing a protected display all password access is disabled and the main display shows Err PW The instrument continues to function normally but none of the password protected settings can be changed Normal operation 15 restored by momentarily turning off power No keyboard commands are required to restore normal password protection The Err PW display is cleared by any keystroke but when attempting to enter a password the display will still show disabled If the password is lost and you want to gain access to protected screens and or enter a new password turn off the power and then reapply it Within one second of the time that text first appears on the screen press the rightmost key on the keyboard The screen will go blank to acknowledge the key press but there will be no other visible indication that the key is recognized After a few seconds the instrument will begin functioning normally except that the configuration password has been disabled for 60 seconds The operational password remains in effect Immediately enter the configuration mode and choose a new password Note This method will not work if the key is down at the time power is applied The key must be depressed shortly after text first appears The following displays control the password settings Operate password level 3 no PW T
27. at the LX A Exit v Stay Exit Stay menu 220 1s prompted to leave the current section before it goes back to the parameter selection menu Press the appropriate menu selection key either to stay in the current section or exit and return to the parameter selection menu 3 3 Configuring the LXT 220 To initially configure or reconfigure the instrument use the left side and V MENU SELECT keys to scroll to the bottom of the menus list and stop when the CONFIGURE TRIM option is displayed Simultaneously depress the 4 and gt keys to enter the configuration mode This mode should be password protected if access to the keyboard is unrestricted The new configuration remains in effect through indefinite power outages The configuration mode is a submenu grouping of 9 or more functions that can be set by the user to tailor the instrument to a particular application The following 7 functions appear in groups of 4 for a standard instrument PASSWORDS 4 20 ASSIGN 4 20 MANUAL MODE RELAY ASSIGN TST amp TEMP CAL 4 20 TRIM TEST Teledyne Analytical Instruments 30 Dissolved Oxygen Controller Operation i RC RR A INPUT A D CONVERTER TRIM Some instruments have two channels measuring two unrelated quantities and in those cases both channels can be configured from the same configuration menus Depending on options selected 2 additional submenus could appear PID ASSIGN H
28. ay Assignments to set up the number of contacts 1On gt 10 00 ppm 1 Off lt 9 85 ppm ch1 PV Relay set up menu 3 2 4 2 3 DO LOCUS AND NOISE FILTER SETTINGS The Locus is the temperature where the different concentrations are equal and is referenced for temperature compensation The noise filter is adjustable from 1 to 20 to dampen any distracting fluctuations on the sensor DO Locus 17 0 C Noise filter 10 Electrode Data menu ORP Electrode Data menu ORP 3 2 4 3 STATUS MENU This menu allows the user to view the time of day clock and the engineering information pertaining to the electrode as an informational screen only The top line displays the real time active absolute millivolt value mVa the electrode is generating uncompensated for temperature variations The bottom line displays the electrode zero potential from the last calibration This information is extremely helpful in determining the diagnostic status of an electrode In conjunction with regular calibrations the Electrode Diagnostic Screen provides valuable information to track electrode performance Teledyne Analytical Instruments 29 Operation LXT 220 DO Fri 12 00 37 Input 150 4 mVa 0 mv 00ppm volatile Time of day clock Electrode Data menu ORP 3 2 4 4 EXIT STAY MENU This menu confirms that the user wishes to leave the section that they are currently in This menu will show up each time th
29. e PID output can be assigned and configured to any of the available outputs Multiple Output The standard LXT 220 DO Controller is provided with a single output With the multiple output option up to four additional outputs can be added These outputs can be defined in the field as the process variable DO pH ORP resistivity conductivity temperature or PID The additional outputs are fully isolated from the inputs and the primary output and are floating so they can have either a positive or negative common These isolated outputs are floating and require an external 24 VDC power source to operate can supply an internal 24 VDC power supply to power these outputs Contact the factory for additional information Alarm Relays Up to six alarm or control relays are available for the primary channel or divided between the two channels on dual output transmitters Relay outputs can be field configured as high or low alarms Hysteresis dead band is defined by setting the ON and OFF relay values The relays can be configured to any of the input parameters HART Output This option provides both digital and analog outputs that is useful for monitoring and controlling process variables in a multiple output instrument Optional Software Differential Output Provides an output expressed as the difference between two inputs Ratio Output Provides an output expressed as the ratio of two inputs This 15 applicable to percen
30. ecommended 3 1 1 Menu Selection Keys The MENU SELECTION keys are used to 1 Change the display menu and move the cursor vertically Any menu can be accessed by the use of the appropriate up or down MENU SELECTION key 2 Exit the calibration mode and save calibration data 3 1 2 Calibrate Keys 1 The horizontal CALIBRATE keys are used to enter the calibrate mode and move the cursor horizontally To enter the calibrate mode both horizontal CALIBRATE keys must be pressed simultaneously 2 Once in the calibrate mode the cursor can be positioned by pressing the individual right hand or left hand horizontal CALIBRATE keys Teledyne Analytical Instruments 23 Operation LXT 220 DO EPAECMPPTIATR CC RQ g 3 With the cursor on a user selectable menu item for instance SETUP in the Parameter Selection Menu pressing both horizontal CALIBRATE keys will take you to the next lower level of screens 4 20 mA screen Relay Setup screen etc 4 The vertical CALIBRATE keys are used to perform numeric adjustments to displayed values To use these keys the LXT 220 must be in the calibrate mode Pressing the upper A CALIBRATE key will increase the value pressing the lower W CALIBRATE key will decrease the value To exit the calibrate mode press either of the MENU SELECTION keys 3 2 Menus The LXT 220 contains a series of menus and sub
31. ed 4 20 output correspond directly to the HART lower and upper range limits and they can be set either from the keyboard or with command 35 If they are changed with the command then the new value will be shown on the instrument s span display for the selected output If they are changed from the keyboard then those values are reported digitally over the HART network If command 35 is to be used to set the limits then the HART 4 20 output must be selected first because the output span does not exist until an assignment is made The span settings must be readjusted or be resent when the HART analog output assignment is changed The 4 20 supplying the HART analog output is normally assigned to the same source as the primary variable and the HART displays show the engineering units for the upper and lower range limits as being the same as those of the primary variable It is possible to assign the analog output to other sources but other assignments are non standard and the units displayed by the remote system will not be correct Teledyne Analytical Instruments 39 Operation LXT 220 DO EPAECMPPTIATR CC RQ g If the 4 20 selected for the HART analog output is assigned to missing or unused then the digital representation of the output current will be not a number but with up to four digital variables still being transmitted 3 3 5 Relay
32. elds will begin with a question mark when a conflict exists When that happens refer to the manual mode configuration displays and HART 1 the question marks there will show where the problem lies No contention occurs unless two different displays are actually in the manual mode for the same 4 20 so the question marks in the displays can be ignored if the assignments are made for diagnostic purposes 3 3 4 HART Output Assignments If the instrument was purchased with the HART option then the next five displays are for assigning the HART digital and analog outputs The first of these displays is where represents one of the items from the 4 20 mA assignment list in Section 3 3 2 HART command 3 requests four variables from the instrument Each of these variables can be assigned to any of the sources shown in the 4 20 assignment section Each variable has a units code which identifies the variable as being pH millivolts degrees C etc The units code is supplied automatically depending on the assignment and the instrument configuration If command 3 is not used then only the first output assignment will be reported If any output is assigned to missing or unused then that value will be reported as not a number and the units field will be not used HART analog 1 The first digital output assignment is referred to as the primary variable in the HART system Teledyne Analytical Instruments 38
33. eledyne Analytical Instruments 32 Dissolved Oxygen Controller Operation RC A s C The protection level for the operational displays is the number on the left side of the second line None of the operational displays are password protected if the protection level is 0 If it is not zero then with the exceptions shown in Table 3 1 all displays that affect the operation of the instrument are protected An N entry in the table means that the display is not protected Table 3 1 Protection Level Exceptions level contrast man out 1 point buf 1 2 x Y N 3 4 Y Y Y 3 3 1 1 CHANGING PROTECTION LEVEL To change the protection level navigate using the right side CALIBRATE lt gt keys to the old protection level number 3 in the above screen Adjust the numerical value using the right side CALIBRATE A V keys and then accept the input by pressing either of the left side MENU SELECT A V keys The old operational password is erased if the protection level is changed to 0 Changing from 0 to another value has no effect until a new password is entered The display shows no PW if the password has been erased 3 3 1 2 CHANGING OPERATIONAL PASSWORD To enter a new operational password navigate to the old password or no PW using the CALIBRATE lt keys and select by pressing both CALIBRATE lt gt keys simultaneously This brings up the new operational password scre
34. en New opr password Teledyne Analytical Instruments 33 Operation LXT 220 DO EPAECMPPTIATR CC RQ g Press both CALIBRATE lt gt keys again to enter a new operational password 1 to 8 digits may he entered Press either of the menu keys to accept the new password when done Note A new password will not be accepted unless the protection level has already been set to a value greater than 3 3 1 3 CHANGING CONFIGURATION PASSWORD To change the configuration password use the MENU SELECT A Y keys to navigate to the PASSWORD menu and select it by pressing both CALIBRATE lt gt keys simultaneously Use the MENU SELECT A V keys to bring the cursor to the Configure password level screen Config password level 1 no PW To enter a new configure password navigate to the old password or no PW using the CALIBRATE lt keys and select by pressing both CALIBRATE lt gt keys simultaneously This brings up the new configure password screen New opr password Press both CALIBRATE lt gt keys again to enter a new configure password 1 to 8 digits may he entered Press either of the menu keys to accept the new password when done Note A new configure password will not be accepted unless the protection level has already been set to 1 These two displays work the same as the corresponding operationa
35. epresents one of the items from the 4 20 mA assignment list in Section 3 3 2 The PID controller outputs in turn represent separate signal sources and various outputs can be assigned to them Not all signal sources are suitable as inputs to a PID processor and an asterisk on the display marks the selections that are unavailable Potentially useful sources such as the process value temperature and quantities derived from the measured process value s are normally available The assignment should be set to unused if no controller is needed This will prevent the PID setup displays from appearing in the operational section Either PID processor can be assigned to a signal from either channel and they can both be assigned to signals on the same channel but they cannot be assigned to the same signal on the same channel The current selection will be preceded by a question mark on the display if making it permanent would result in duplication Up to two 4 20 mA outputs and up to two relays can be assigned to each PID processor output The output of the PID processor is discarded if nothing is assigned to it If a 4 20 mA output is assigned to a PID processor there will be no display for it in the setup section of the operational displays as the 4 20 output scaling is fully specified by the PID setup parameters in the same section If relays are assigned to a PID output there will be setpoint Teledyne Analytical Instruments 43
36. esponsibility of those who control process conditions While this instrument may be able to provide early warning of imminent danger it has no control over process conditions and it can be misused In particular any alarm or control systems installed must be tested and understood both as to how they operate and as to how they can be defeated Any safeguards required such as locks labels or redundancy must be provided by the user or specifically requested of TI AI at the time the order is placed Therefore the purchaser must be aware of the hazardous process conditions The purchaser 15 responsible for the training of personnel for providing hazard warning methods and instrumentation per the appropriate standards and for ensuring that hazard warning devices and instrumentation are maintained and operated properly Teledyne Instruments Analytical Instruments the manufacturer of this instrument cannot accept responsibility for conditions beyond its knowledge and control No statement expressed or implied by this document or any information disseminated by the manufacturer or its agents is to be construed as a warranty of adequate safety control under the user s process conditions Teledyne Analytical Instruments ii Dissolved Oxygen Controller Specific Model Information Instrument Serial Number Instrument Range Calibrated for Teledyne Analytical Instruments LXT 220 DO Safety Messages Your s
37. et up menu Once in the Parameter set up menu select the function you would like to enter Teledyne Analytical Instruments 45 Operation LXT 220 DO Buffer Setup Status e BUFFER Perform a 1 or a 2 point calibration e SETUP Set up the range of the 4 20 mA output STATUS Information only Shows the data stored from the last calibration 3 4 2 1 BUFFER MENU From the parameter selection menu chose the top line the BUFFER command and press the two horizontal lt b CALIBRATE keys simultaneously to enter the BUFFER calibration submenu Both the one point calibration standardize and the two point span calibrations are available within this menu The procedures for each calibration function are given below 3 4 2 2 ONE PoINT BUFFER CALIBRATION STANDARDIZE Because all dissolved oxygen electrodes experience minor variations buffer calibrations are necessary before installing the electrodes in service Also occasional calibrations are necessary to compensate for electrode degradation while in service For measurement specifics refer to the dissolved oxygen sensor manual 1DO 00 ppm Cal 0 mV Standardization menu pH Procedure 1 Be sure that the cursor is located under the 1 as illustrated 2 For diagnostic reasons note the ppm and mV values from the prior calibration Teledyne Analytical Instruments 46 Dissolved Oxygen Controller Operation RC A s C
38. ex STATUS 27 46 STATUS menu 29 submenus 24 Supertwist 53 switch 14 16 tables listing x technician symbol iv Teledyne address 55 temperature calibration 40 temperature compensation 54 temperature control 13 temperature conversion 14 41 terminal block 17 timer 32 54 trim 41 troubleshooting 52 two point calibration 22 two point calibration 44 46 typical electrode 22 49 U bolt 20 undisturbed output 26 warning sign iv warranty 11 weatherproof 53 web address 55 website address v white screen 25 wiring 21 wiring label 17 21 zero electrode offset 14 22 zero potential 27 29 Teledyne Analytical Instruments 61
39. gainst the panel 2000268 Dimensions handrail mounting These application drawings can be located in the back of this manual 2 3 Electrical Connections electrical connections are made with connectors to a panel inside the NEMA 4X enclosure To gain access to the panel use a flat blade screwdriver to remove the 4 captive screws on the front of the instrument and swing the panel out See Figure 2 1 0072 75 ppm 82 5 25 1 c Captive Screws SELECT 4 CALIBRAT 2 0 hd y 06 Teledyne Analytical Instruments Figure 2 1 Opening the Front Panel Teledyne Analytical Instruments 20 Dissolved Oxygen Controller Installation 2 3 1 AC Power The LXT 220 requires a 115 VAC 60 Hz power source A 24VDC unit is available as an option CAUTION SURE THE CIRCUIT BREAKER PROTECTING THE AC INPUT LINE IS OFF BEFORE WIRING THE LXT 220 Application drawing 4024003 illustrates the proper power wiring for single channel LXT 220 as does the affixed label on the backside of the front panel The wires are best fed through the right conduit as shown in Figure 2 2 N Removable Terminal Blocks AC Power Wires Connection gt Signal I O Diagram Figure 2 2 LXT 220 Electrical Connections 2 3 2 Sensor Wiring A conditioned input is required from the sensor or electrode to the LXT 220 for proper operation Teledyne s SP1 and SP2 se
40. gurability Password Protection Sentinel Compatible Conc Curves 24VDC HART option 4 to 158 F 20 to 70 C 5 67 H 5 67 697 D Automatic 30 to 140 C RTD Accuracy within 1 0 C over a 0 100 C span Greater than 70 db Auto calibration allows the definition of two calibration points saved in memory during the initial startup This will allow subsequent standardization and span calibrations with only 2 keystrokes Cal parameters initiated by configuration settings Parameter graph Relays up to 8 solid state or SPDT mechanical 8 internal clocks and timers one shot and periodic 4 current outputs 4 20mA and 2 PID current outputs logical function and or gates can all be setup as desired in the configuration menus 5A switching mechanical relays 065 3A 230V AC solid state with 600 W total load without additional heat sinking precautions Multilevel password configuration allows selection of protected parameters in operational and or configuration routines 2 channels Built in for conductivity measurements 804 NaOH NaCl HF HNO KOH etc Teledyne Analytical Instruments 54 Dissolved Oxygen Controller Appendix Oe A 2 Model Designation The standard LXT 220 controller is 110VAC powered unit in a 1 2 DIN NEMA 4X enclosure It incorporates a backlit graphics display and a membrane keypad This instrument requires an external 24VDC to power the outputs
41. hile cleaning If the enclosure cover must be removed it is wise to clean and inspect the gasket seal If the seal is damaged replace the gasket Always keep the gasket lightly lubricated with a silicone grease 4 1 2 Replacement of the Microprocessor For replacement of the microprocessor contact the factory CAUTION NEVER INTERCHANGE EPROMS FROM ONE TRANSMITTER TO ANOTHER DOING SO WILL AFFECT TRANSMITTER PERFORMANCE Teledyne Analytical Instruments 51 Maintenance Table 4 1 Troubleshooting LXT 220 DO SYMPTOM POSSIBLE CAUSES SUGGESTED ACTION The LCD does not No power to the Check power supply display instrument to be sure the correct voltage is being supplied to the transmitter Contrast level is set too low Set contrast level to a higher value Because the contrast menu is always the top menu it can be reached by pressing the upper MENU SELECTION key at least 12 times Enter the calibrate mode and increase the value Sensor or signal conditioner has a short that draws too much power from the transmitter Check the sensor for proper operation To verify disconnect all sensor wires and cycle power off then on The PROM has not been properly installed in the socket Check orientation of the PROM to the socket Make sure the pins are fully inserted and are not bent Readings are not linear at the low end of the range The sensor range is not com
42. ion you would like to perform With the cursor on BUFFER if you press lt and gt together the LXT 220 will enter the calibration menus standardize and span Scrolling to and choosing SETUP brings you to where you can configure and setup the instrument The STATUS section allows the user to view the calibration engineering data mV input from the sensor and the zero potential from the last cal Each section 15 entered by placing the cursor under the first letter of the section you wish to enter and pressing the two horizontal calibrate keys simultaneously The Parameter Selection Menu is discussed in detail in Section 3 4 2 3 2 4 1 CALIBRATION SUBMENU Choosing BUFFER from the Parameter Selection Menu brings up a submenu that allows the user to perform a 1 or 2 point buffer calibration standardize amp span This menu is described in detail in Section 3 4 2 Calibration 1DO 00 ppm Cal 0 mV Zero Calibration Menu DO Teledyne Analytical Instruments 27 Operation LXT 220 DO EPAECMPPTIATR CC RQ g 3 2 4 2 SETUP SUBMENU Choosing SETUP from the Parameter Selection Menu brings up the first of a series of screens that allows the user to configure some initial parameters in the LXT 220 controller These parameters are e 4to20 mA outputs relay contacts PID control HART You can also setup how the graphic displa
43. l displays except that the protection level can only be 0 or 1 Teledyne Analytical Instruments 34 Dissolved Oxygen Controller Operation i RC RR A The configuration password is rarely used and the configuration settings are more sensitive so the password should use more digits than the operational password With eight base 4 digits the odds of breaking the code in three tries are 3 in 65536 if the user knows that there are 8 digits The user will not know the number of digits that you chose so the odds are usually smaller than that The maximum number of digits allowed in a password or the number actually used cannot be determined by entering trial passwords A two or three digit password is therefore moderately effective 1f systematic attempts at breaking the code are not anticipated but short passwords should nevertheless be avoided in a critical process 3 3 2 4 20 mA Output Assignments The next group of displays are used to assign the 4 20 mA outputs Note The LXT 220 has been configured at the factory for your specific application as specified at the time of the order Using the MENU SELECT A V keys scroll down to the 4 20 mA ASSIGN option and select it by pressing both CALIBRATE lt gt keys simultaneously The screen will display 4 20 1 where is one of the following selections missing not installed unused Installed but not currently used ch1 PV Channel 1 process value
44. l Mode Assignment for more information 3 3 3 Manual Mode Assignment In the manual output mode the current output 15 manually set to the desired level and saved until changed or released from the manual mode The main menu display shows the process value and a 4 20 mA percent Teledyne Analytical Instruments 36 Dissolved Oxygen Controller Operation i RC RR A output field for each channel The manual mode assignment allows the percent output display to be associated with any of the 4 20 outputs in cluding the HART output When in the manual mode the 4 20 output is controlled from the keyboard Zero percent corresponds to a current of 4 mA and 100 percent corresponds to a current of 20 mA If a 4 20 output is used to control the process then the manual mode is normally assigned to that output although the instrument does not require this choice Cross channel assignments are allowed in that the selected 4 20 can be assigned to something on the other channel Cross channel assignments can usually be avoided and they should be avoided when possible ch1 man mode on 4 20 3 ch1 PV To change the assignment simultaneously depress both CALIBRATE lt gt keys then use the right side CALIBRATE A V keys to change the selection One of the selections is and with that selection the percent output field is not present in the operational display The bottom line shows the signa
45. l that the selected 4 20 is assigned to On two channel instruments the next display is the manual mode assignment for channel two Each 4 20 output can have only one manual mode control assigned to it If one already exists for the current selection it will be preceded by a question mark Some instruments have more than two manual mode controls in the operational displays and they must all he assigned to different 4 20 outputs if they are activated The other manual mode controls are built in in some instruments An example would he the weight percent display of a conductivity unit The manual mode field appears in a separate display in these cases and it is independent of the manual mode assignments for the main display The manual mode capability is automatically activated when a 4 20 15 assigned to one of these functions The percent output field does not appear in the operational display unless a 4 20 is assigned to it Conversely when changing the 4 20 assignments a conflict can arise if a 4 20 with a pre existing manual mode control is reassigned to Teledyne Analytical Instruments 37 Operation LXT 220 DO EPAECMPPTIATR CC RQ g a function with its own manual mode output The 4 20 assignment display will show if the output is associated with an assignable manual mode Regardless of the cause the affected operational display manual mode fi
46. menus from which different functions can be accessed Even though the display only shows 4 menus per screen you can scroll through all available menus by using the MENU SELECT A and V keys The menus available in the standard LXT 220 instrument configured for single channel dissolved oxygen controllers are shown in Figure 3 1 When the instrument is first powered up a copyright display will appear for a few seconds This screen displays the serial number and software version for your instrument After a few seconds the display changes to the main menu From the main menu you can scroll up A to the contrast menu or down V through the available menus for your controller S N1004 1 00 COTUTAI 2002 opyright Display Some menus allow you to choose from several options To select an option or item scroll to the option using the MENU SELECT A V keys When the cursor is next to the item of interest select the item by simultaneously pressing both the left and right 4 9 CALIBRATE arrow keys on the right side of the front panel Teledyne Analytical Instruments 24 Dissolved Oxygen Controller Operation There may be additional menus not shown in Figure 3 1 depending on the options you selected Power Up Copyright Screen Parameter Other Main Graphics Instrument Contrast 7 Selection Optional Menu Display Menu Configuration Trim Men s Buffer Calibration Passwords Standardization 4 20 mA Assign Span Calibra
47. nsors will provide the required conditioning The application drawing 4024003 Teledyne Analytical Instruments 21 Installation LXT 220 DO pep R R A Us X s illustrates the proper sensor wiring and is also shown on the affixed label on the backside of the front panel 2 4 Configuring the LXT 220 The LXT 220 Controller is used for measurement and control for a wide range of liquid analytical applications This manual describes the configuration for use in dissolved oxygen measurement and control applications If your instrument included optional features such as dual channel input for handling other specific measurement processes a second manual will be included to describe the setup and operational parameters specific to that function Configuring the instrument is described in Section 3 of this manual 2 5 Calibration Prior to using the instrument for the first time the LXT 220 must be calibrated The specific calibration procedure used depends on the application Among other things the calibration routine establishes the correspondence between the 4 20mA output signal and the application dependant measurable parameter This manual describes operation for dissolved oxygen measurements and process control for the LXT 220 Calibration can be performed without disturbing control or recorder functions using a manual output mode see Section 3 4 1 Typically the calibration is done
48. o factory calibration can be used for both standardize and span calibrations 2DO 10 0 ppm Cal 157 5 mV FS Standardization menu DO factory default Standardization menu factory default settings settings Procedure at the Standardization Menu 1 Position the cursor under the C in Cal 2 Press both horizontal CALIBRATE keys simultaneously and observe the cursor briefly move to the right The default setting is complete Teledyne Analytical Instruments 49 Operation LXT 220 DO 3 This procedure is required at BOTH of the calibration points Teledyne Analytical Instruments 50 Dissolved Oxygen Controller Maintenance 4 1 Routine Maintenance Aside from normal cleaning routine maintenance is limited to recalibration For recalibration see Section 3 4 Calibration However if service of the internal components is required always turn off the power to the instrument 4 1 1 Cleaning Although the LXT 220 NEMA 4X enclosure can withstand harsh environments it may become necessary to clean the front panel if it becomes coated or dirty Cleaning the front panel can be performed with a detergent and water CAUTION DO USE ACETONE ACIDS OR CAUSTIC SOLUTIONS ON THE ENCLOSURE SURFACE Before cleaning the integrity of the enclosure seals should be inspected Also check the conduit fittings and seals to make sure moisture does not enter the enclosure w
49. ode must also contain the diagnostic option for the feature to function 4 to 20mA Current outputs are field configurable If the outputs are to be configured by Teledyne at time of shipment the output parameters must be specified If not specified the outputs will be configured as standard 4 to 20mA outputs corresponding to the specified input If an output is required along with the display a second Teledyne Analytical Instruments 57 Appendix LXT 220 DO ieee _ _ output must be specified Output configuration options MA 4 20 mA standard TMP 4 20 mA Temperature adjustable 100 to 200 C PID 4 20 mA 3 mode control mA concentration for display and 2nd output Conductivity only DIAG Sentinel Reference Diagnostic As an example MODEL NUMBER EXAMPLE LXT 220 PH MA PS2 UM This indicates the LXT 220 Controller for pH applications with a standard single 4 20mA output The controller has an internal 24 VDC power supply to power the output card The instrument is equipped with a universal mounting plate Teledyne Analytical Instruments 58 Dissolved Oxygen Controller Index A to D converter trim 42 AC power See power accuracy 42 53 address 55 air 47 alarm 13 15 HI 13 LO 13 alarm relay 40 analog to digital converter 42 ASSIGN 35 assigning parameters 28 assignment conflict 36 37 auto calibration 54 automatic calibration 14 back to factory
50. patible with the instrument Verify the sensor range Install a sensor with the correct range Erratic readings Air bubble in sensor Check orientation of sensor Teledyne Analytical Instruments 52 Dissolved Oxygen Controller Appendix Appendix A 1 Specifications Packaging Power Requirements Display Sensor 4 weatherproof enclosure suitable for general purpose application 115 220 VAC or optionally 24 VDC 0 25A Menu driven Supertwist LCD Simultaneously displays process ID Process value in Eng units output and temp in or F Application specific Input Measurement Parameters Outputs Response Time Accuracy Linearity Sensitivity Stability Repeatability Input Output Isolation Conductivity Resistivity pH Specific Ion Dissolved Oxygen ORP Also external events and analog inputs can be integrated logically or operational modifiers 4 20 mA HART or RS232 up to a maximum of 6 analog outputs 90 of step change in 1 second 0 10 of full scale 0 05 of full scale 0 05 0 2 per year 0 to 70 C 0 1 Max 300V between process input and any 4 20mA output 4 Teledyne Analytical Instruments 53 Appendix LXT 220 DO Maximum Loop Impedance 8000 on 4 20 outputs with internal Digital Interface Operating Temperature Dimensions Temp Compensation 50 60Hz Noise Rejection Calibration Confi
51. ptional PID controller output on channel 2 the current output displayed is the PID controller output The following procedure demonstrates the use of the manual output Note Prior to any calibration The LXT 220 controller should be placed into the manual mode Teledyne Analytical Instruments 44 Dissolved Oxygen Controller Operation 7 80 50 0 25 0 C Main Menu DO Procedure 1 Ifnot at the Main Menu press the appropriate MENU SELECTION key to reach the Main Menu 2 Press both horizontal 9 CALIBRATE keys simultaneously to enter the calibrate mode and observe the M appearing in front of the current output value The M signifies that the manual output is locked in the manual mode 3 Using the horizontal CALIBRATE keys one at a time position the cursor under the digit to be adjusted 4 Increase or decrease the value by pressing the appropriate vertical A W CALIBRATE key To release manual output 1 Return to the Main Menu by pressing the appropriate MENU SELECTION key 2 Observe that the M appears in front of the current output value This M signifies that the transmitter output is in manual 3 Press only the left hand lt CALIBRATE key and observe the M disappear releasing the LXT 220 from the manual output mode The output value will return to the real time current output 3 4 2 Parameter Selection Menu Scroll down from the main menu to reach the parameter s
52. ressed and the output current is set to 4 00 mA overriding the output assignment Measure the 4 20 output 1 current with an ammeter and adjust the number on the top line until the meter reads 4 00 mA Teledyne Analytical Instruments 41 Operation LXT 220 DO EPAECMPPTIATR CC RQ g The next display is for trimming the 20 mA point of output 1 and it works the same as the 4 mA trim The 4 mA and 20 mA trims do not interact and the endpoint trims are linearly interpolated for other output values Note The 4 20 5 output must be trimmed by standard commands sent over the HART communication link 3 3 8 Input A D Converter Trim This display is used to calibrate the analog to digital converter that is used to measure the process value The bottom line shows the measured input voltage The scale factor on the top line is adjusted until the displayed voltage is the same as that of a voltmeter connected to the input If the process 15 stable then the voltage can be the output of a sensor but it is better to replace the sensor with a fixed voltage source For optimum accuracy the calibration voltage should be a substantial portion of the full scale voltage It can be of either polarity The input zero point error is automatically removed so there is no adjustment for it 1 in gain 1 0000 400 0 mV Innit A D converter trim The normal input
53. rt displays will also be present The next two displays are for the second and third 4 20mA outputs Some units do not have all three outputs but the displays will show three output options anyway as the additional outputs can be retrofitted The missing assignment should be selected for uninstalled outputs The software cannot determine how many 4 20 outputs are installed so the missing selection might not reflect the actual configuration Output 4 is dedicated to HART and its assignment is discussed in the HART section If the instrument is not connected to HART network then the fourth output can be used like any of the other outputs The fourth output 15 only present if the instrument was purchased with the HART option A span display will be present in the setup menu for each 4 20 output that is assigned to a source unless the source is a PID controller PID controllers have different setup displays and they are in the same section If the source is associated with channel 2 then the display will be in the channel 2 group The new assignment is not usable until the setpoints or PID parameters are specified in the operational displays The third line of the display will show a line such as chl man mode if an assignable manual mode control is associated with the output The line will begin with a question mark if making the current selection permanent would result in a manual mode assignment conflict Refer to Section 3 3 3 Manua
54. t our factory without charge except for transportation or at customer plant at our option any material or construction in which defects become apparent within one year from the date of shipment except in cases where quotations or acknowledgements provide for a shorter period Components manufactured by others bear the warranty of their manufacturer This warranty does not cover defects caused by wear accident misuse neglect or repairs other than those performed by TI AI or an authorized service center We assume no liability for direct or indirect damages of any kind and the purchaser by the acceptance of the equipment will assume all liability for any damage which may result from its use or misuse We reserve the right to employ any suitable material in the manufacture of our apparatus and to make any alterations in the dimensions shape or weight of any parts in so far as such alterations do not adversely affect our warranty Important Notice This instrument provides measurement readings to its user and serves as a tool by which valuable data can be gathered The information provided by the instrument may assist the user in eliminating potential hazards caused by his process however it is essential that all personnel involved in the use of the instrument or its interface with the process being measured be properly trained in the process itself as well as all instrumentation related to it The safety of personnel is ultimately the r
55. t rejection in some applications Averaged Output Provides an output expressed as the average of two inputs Teledyne Analytical Instruments 15 Introduction LXT 220 DO TOD 1 4 Front Panel The operator interfaces with the instrument from the front panel Figure 1 1 shows a standard single channel LXT 220 DO instrument front panel The panel includes the LCD display capable of outputting information in both a textural and graphical format There are 6 membrane switches keys that control the operation of the unit The keys are in two groups MENU SELECT UP DOWN These keys are used to change the display menu and move the cursor vertically Any menu can be accessed using the appropriate MENU SELECT key These keys are also used to exit the calibration mode and save calibration data CALIBRATE KEYS UP DOWN LEFT RIGHT 4 gt The Aorizontal CALIBRATE keys are used to enter the calibrate mode and move the cursor horizontally To enter the calibrate mode both horizontal CALIBRATE keys must be pressed simultaneously Once in the calibrate mode the cursor can be positioned by pressing the appropriate individual CALIBRATE key These keys are also used to select an item from a menu See Section 3 1 The vertical CALIBRATE keys are used to perform numeric adjustments to displayed values Pressing the A CALIBRATE key will increase the value pressing the W CALIBRATE key will decrease the value DO 8 25 ppm
56. tion Exit 4 20 mA Manual Mode Setup PID Assign 4 20 mA E Relay Setup HART Assign 5 PID HART Relay Assign tst 8 Status Temperature Calibration 4 20 mA Trim Test 6 Input A D Trim Figure 3 1 Available Menus and Submenus In this manual screens with a gray background are related to dissolved oxygen measurement or control while white background screens relate to a second channel process for instance ORP related screens When there is only one gray screen the information applies to both process applications for example the contrast screen discussed next adjusts the contrast for all screens 3 2 1 Contrast Display contrast can be adjusted to allow for variations of ambient lighting and viewing angle by using this menu The Contrast Menu is the same for all LXT 220 controllers and is always located as the uppermost menu To access this menu from the Main Menu press the MENU SELECT key Contrast 50 Contrast Menu Teledyne Analytical Instruments 25 Operation LXT 220 DO EPAECMPPTIATR CC RQ g Procedure 1 Press the upper MENU SELECTION key to reach the Contrast Menu 2 Press both horizontal CALIBRATE keys simultaneously to enter the calibrate mode Observe the cursor move to the last digit 3 Using the horizontal CALIBRATE keys position the cursor under the digit to be adjusted 4 Increase or decrease the value by
57. ts components or unauthorized substitution of any component may adversely affect the safety of this instrument Since the use of this instrument is beyond the control of Teledyne Instruments Analytical Instruments referred as no responsibility by TI AI its affiliates and agents for damage or injury from misuse or neglect of this equipment is implied or assumed Teledyne Analytical Instruments xi Teledyne Analytical Instruments LXT 220 DO xii Dissolved Oxygen Controller Introduction Introduction 1 1 Overview Teledyne s Model LXT 220 Dissolved Oxygen Controller is a robust and versatile instrument for the measurement and process control of dissolved oxygen in a liquid component Highly customizable the Model LXT 220 comes standard with a single 4 20mA current output but can have as many as five The current output is field selectable and may be expanded to any range within the transmitter s full operating range It can also be programmed as reverse acting for example a 4 20 mA output for a range of 0 to 10 ppm can be reversed to 10 to 0 ppm The standard instrument accepts a single input typically from a Teledyne SP1 or SP2 Dissolved Oxygen probe however a dual input option is available This optional dual input extends the functionality of the instrument to accept conditioned input from a variety of sensors for specific process measurements such as Second Dissolved Oxygen DO channel
58. ure outlined below 1 Before unpacking inspect the condition of the shipping container to verify proper handling by the carrier If damage is noted save the shipping container as proof of mishandling for the carrier 2 Check the contents of the shipping container with the items and quantities shown on the packing list Immediately report any discrepancies to TI TAI 3 Save the original packing material until you are satisfied with the contents In the event the transmitter must be returned to the factory the packing material will allow you to properly ship it to TI TAI 4 Familiarize yourself with the instrument before installation and follow proper installation and wiring procedures 2 2 Mounting Three typical installation configurations are available for the LXT 220 Universal mounting plate Teledyne Analytical Instruments 19 Installation LXT 220 DO pep R R A Us X s Handrail mounting plate e Panel mounting configurations U bolts may be ordered separately Refer to the following application drawings for mounting details 4024011 Dimensions wall amp pipe mounting The unit is supplied with a universal mounting bracket Two slots on each side will accommodate U Bolts for pipe mounting 4024012 Dimensions Panel Mounting This installation uses 1 4 screws Panel mounting is accommodated using the captive jackscrew that will cinch the instrument bezel a
59. y plots the current output using the Plot function The menu below shows the Plot function In this case the process variable assigned to Channel 1 is plotted and sampled every 6 seconds 1 min Plot 4 20 1 Sample lm ch1 PV Current output menu To set up additional parameters or to change to current preset parameters refer to Section 3 3 Configuring the LXT 220 in this manual 3 2 4 2 1 CURRENT OUTPUT SETUP This menu is used to set or adjust the current output range with the process variable The top line defines the 4 mA point while the bottom line defines the 20 mA point Between these points the output current is linear with respect to the sensor input The standard LXT 220 provides a single output channel but options are available to expand the number of current outputs to 4 See Section 3 3 Configuring the LXT 220 in this manual for information on assigning other parameters to additional outputs _4mA1 00 ppm 20mA1 10 00 ppm now 18 84 ma ch1 PV Current output menu Teledyne Analytical Instruments 28 Dissolved Oxygen Controller Operation RC A s C 3 2 4 2 2 RELAY CONTACTS Relay on off set points are adjusted in this menu The top line defines the point in which the relay is energized on and the bottom line defines the point in which the relay is de energized off The LXT 220 can contain up to 6 sets of relay contacts Refer to Section 3 3 5 Rel
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