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Clearing problem, Poor calibration repeatability, Unstable output/ sudden spiking – Detcon CXT-IR User Manual

Page 42: Nuisance alarms, Transmitter not responding, Low battery / low voltage fault

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Model CXT-IR

Clearing problem

Probable Causes: Failed sensor, cal gas not removed at appropriate time, problems with cal gas and delivery,
background of target gas.

• The sensor must recover to < 10% of range in < 5 min after Span calibration is complete

• Use bottled air (zero air or N

2

) if there is a known continuous background level.

• Check validity of span gas using pull tube or other means (check MFG date on cal gas cylinder).

• Use proper cal gas regulators and tubing for highly corrosive gases

• Check for obstructions affecting cal gas hitting sensor face (including being wet, blocked, or

corroded). Sensor assemblies use CXT-IR series splashguard adapter assembly with integral filter.
Clean or replace if necessary.

• Replace the plug-in combustible sensor.

Poor Calibration Repeatability

Probable Causes: Failed sensor, use of wrong cal gas or problems with 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). Sensor assemblies use CXT-IR series splashguard adapter assembly with integral filter.
Clean or replace if necessary.

• Replace the plug-in combustible sensor.

Unstable Output/ sudden spiking

Possible Causes: Unstable power supply, inadequate grounding, or inadequate RFI protection.

• Verify power source is stable.

• Verify field wiring is properly shielded and grounded.

• Contact Detcon to optimize shielding and grounding.

• Add Detcon

ꞌs RFI Protection Circuit accessory if problem is proven RFI induced.

Nuisance Alarms

• Check condulet for accumulated water and abnormal corrosion on terminal board.

• If nuisance alarms are happening at night, suspect condensation in condulet.

• Add or replace Detcon

ꞌs Condensation Prevention Packet (PN 960-202200-000).

• Investigate the presence of other target gases that are causing cross-interference signals.

• Determine if cause is RFI induced.

Transmitter not responding

• Verify condulet has no accumulated water or abnormal corrosion.

• 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.

• Change out all three of the Lithium Ion non-rechargeable ‘C’ size batteries with new batteries.

NOTE

Contact the Detcon Service Department for further troubleshooting assistance at

281-367-4100.

CXT-IR Instruction Manual

Rev. 1.6

Page 38 of 44