Detcon CXT-IR - Manual (Page 41)

Model CXT-IR
6. Troubleshooting Guide
If the ITM detects any functional errors the ITM will display the fault. If the sensor is experiencing a fault
condition a momentary swipe of the magnet will cause the ITM to scroll the fault condition(s) across the
display before the
◄ or ► prompt will appear.
The Display Error Codes are:
Auto Span Fault
Temperature Fault
Memory Fault
Processor Fault
Clearing Fault
Range Fault
Missing Sensor Cell Fault
Sensor Fault
Zero Fault
Low Battery Fault
Some faults are self-explanatory, and if these faults occur and cannot be cleared the ITM should be replaced
first to see if the fault will clear. Other faults may need further investigation. Some of the sensor problems,
associated error codes, and resolutions are listed below.
Missing Sensor Cell Fault
Probable Cause: The sensor cell is not installed, is installed incorrectly, or is nonoperational.
• Replace the Sensor Cell with a known good Sensor Cell.
Sensor Fault
Probable Cause: The sensor optics have become too dirty to support functionality.
• Replace the Sensor Cell with a known good Sensor Cell.
Under-Range problems
Probable Cause: Sensor baseline drifted lower, interference gases,
• Perform zero calibration.
• Use zero air or N
2
source. (Section3.3.1AutoZero)
• Allow more time for zero stabilization if this is a biased sensor type.
• Execute successful span calibration. (Section 3.3.2AutoSpan)
• Replace plug-in combustible sensor if error continues.
Stability problems
Probable Causes: Failed sensor, empty or close to empty cal gas cylinder, problems with cal gas and delivery
• 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.
• If using Splashguard with Integral Cal Port, must use Calibration Wind Guard or air movement can
compromise span gas delivery.
• 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.
CXT-IR Instruction Manual Rev. 1.6 Page 37 of 44