Model CXT-DM
CXT-DM Instruction Manual
Rev. 2.0
Page 41 of 54
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Replace the plug-in toxic sensor.
Poor Calibration Repeatability
Probable Causes: Failed Sensor, use of wrong Cal Gas or problems w/ cal gas and delivery, Interference Gases
•
Check validity of span gas with regulator and sample tubing in place using pull tube or other means
(check MFG date on cal gas cylinder).
•
Use proper cal gas regulators and tubing for highly corrosive gases (HF, HCI, Cl2, NH3, HBR, F2,
etc.)
•
Check for obstructions affecting cal gas hitting sensor face (including being wet, blocked, or
corroded). H2S sensors assemblies use CXT-DM Series Splashguard Adapter Assembly with integral
filter. Clean or replace if necessary.
•
Replace the plug-in toxic sensor.
Unstable Output/ sudden spiking
Possible Causes: Unstable power supply, inadequate grounding, or inadequate RFI protection.
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Verify Power source is stable.
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Verify field wiring is properly shielded and grounded.
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Contact Detcon to optimize shielding and grounding.
•
Add Detcon’s RFI Protection Circuit accessory if problem is proven RFI induced.
Nuisance Alarms
•
Check condulet for accumulated water and abnormal corrosion on terminal board.
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If nuisance alarms are happening at night, suspect condensation in condulet.
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Add or replace Detcon’s Condensation Prevention Packet P/N 960-202200-000.
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Investigate the presence of other target gases that are causing cross-interference signals.
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Determine if cause is RFI induced.
Transmitter not responding
•
Verify condulet has no accumulated water or abnormal corrosion.
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Verify required batteries are installed and have enough charge to power the sensor.
•
Swap with a known-good ITM to determine if ITM is faulty.
Low Battery / Low Voltage Fault
Possible Cause: Lithium Ion batteries are depleted.
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Change out all of the Lithium Ion non-rechargeable ‘C’ or ‘D’ size batteries with new batteries.
NOTE
Contact the Detcon Service Department for further troubleshooting assistance at
281-367-4100.