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Model LXT-230 Instruction Manual /  12 

5.0 MAINTENANCE 

If service of the internal components is required, always turn off the power to the 
instrument. 

5.1 Cleaning 

Cleaning the front panel can be performed with a detergent and water. DO NOT USE 
ACETONE, ACID OR CAUSTIC SOLUTIONS ON THE ENCLOSURE SURFACE. 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. 

5.2 Replacement of the Microprocessor 

Contact factory. 

Summary of Contents for LXT-230

Page 1: ...l LXT 230 Transmitter Installation and Operating Manual for pH and ORP Teledyne Analytical Instruments 16830 Chestnut Street City of Industry CA 91748 888 789 8168 ask_tai teledyne com www teledyne ai...

Page 2: ...6 2 3 Sensor Wiring 6 3 0 FAMILIARIZATION 7 3 1 Key Functions 7 3 1 1 Menu Selection Keys 7 3 1 2 Calibrate Keys 7 3 2 Display Menus and Screens 7 3 2 1 Contrast Menu 7 3 2 2 Main Menu 8 3 2 3 Electro...

Page 3: ...Guidelines 15 6 7 Back to Factory Calibration 15 6 8 Output Calibration 15 6 9 Temperature Calibration Trim Adjustment 16 6 10 Temperature Units Calibration Celsius Fahrenheit Conversion 16 7 0 LXT 2...

Page 4: ...ane switches located on the front cover removing the need to open the NEMA 4X enclosure and exposing components to the environment No potentiometric adjustments are required 1 2 Digital Display A 32 c...

Page 5: ...ic Ion Dissolved Oxygen or Temperature The second output is fully isolated from the inputs and the primary output and is floating so it can have either a positive or negative common 1 10 Three Outputs...

Page 6: ...rtant to observe the polarity Although no damage to the LXT 230 will result from polarity reversal the LXT 230 will not function CAUTION Do NOT apply 110 vac to the 24 vdc wiring terminals Damage to t...

Page 7: ...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 individual rig...

Page 8: ...C This information is extremely helpful in determining the diagnostic status of a pH or ORP electrode In conjunction with regular calibrations the Electrode Diagnostic Screen provides valuable inform...

Page 9: ...s linear with respect to the sensor input By reversing the signs the European convention or the Thermodynamic American convention can be defined 3 2 7 Temperature Calibration Menu This Menu has two ca...

Page 10: ...rode is graphically depicted on the right side of the LXT 230 main process screen as a vertically expanding diagnostic bar culminating in a flashing pre pHault alert This pre pHault Alert warns the us...

Page 11: ...es that would introduce new electrolyte contaminants thereby impacting the rate of reference contamination in the electrode After the desired mV values are set into the DIAGNOSTIC CALIBRATION SCREEN f...

Page 12: ...ront panel can be performed with a detergent and water DO NOT USE ACETONE ACID OR CAUSTIC SOLUTIONS ON THE ENCLOSURE SURFACE If the enclosure cover must be removed it is wise to clean and inspect the...

Page 13: ...in Menu by pressing the appropriate MENU SELECTION key 2 Observe that the M appears in front of the current output value The M signifies that the output is being held at the displayed value 3 Press th...

Page 14: ...or efficiency Procedure 1 Perform a one point calibration as outlined in section 5 3 2 Press the appropriate MENU SELECTION key to reach the Electrode Span Menu and locate the cursor under the 2 as i...

Page 15: ...e buffer solutions or the handling procedure should be questioned See the pH ORP sensor manual for specifics on the electrode 6 7 Back to Factory Calibration This feature allows the LXT 230 to be rese...

Page 16: ...enu 3 Position the cursor on the top line 4 Press both horizontal CALIBRATE keys simultaneously to enter the calibrate mode Observe the cursor move under the last digit 5 Position the cursor under the...

Page 17: ...Model LXT 230 Instruction Manual 17 4 To toggle back to the first unit of measurement press the CALIBRATE keys again Trim C 0 Unit 25 0 C Trim F 0 Unit 77 0 F...

Page 18: ...to 200 C Channel 3 Output TMP1 Only output available on this channel Mounting Hardware UM Universal mounting plate PM Panel mounting hardware HM Handrail mounting plate including 2 hardware Other Opti...

Page 19: ...or for proper operation To verify disconnect all sensor wires and cycle power off then on The slope calibration is mis calibrated Typically the transmitter is calibrated with no slope 0 mV pH Check bu...

Page 20: ...orrection has been calibrated in the temperature trim Examine the temperature and the Temperature Calibration Menu Adjust trim as required LCD turns black Power to the transmitter dropped below the mi...

Page 21: ...INEARITY 0 05 of full scale SENSITIVITY 1 0 mV STABILITY 0 2 per year 0 C to 70 C RESPONSE TIME 1 second to reach 90 of the change REPEATABILITY 1 0 mV TEMPERATURE COMPENSATION pH Automatic 30 C to 14...

Page 22: ...Trim Allows for compensation for any differences in RTDs by programming the offset into the transmitter Temperature Display Temperature can be field configured to display in OC or OF Display Contrast...

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