Detcon CX-DM - Manual (Page 32)

Model CX-DM
• Check for obstructions affecting cal gas hitting sensor face (including being wet, blocked, or
corroded). H2S sensors assemblies use CX_DM Series Splashguard Adapter Assembly with
integral filter. Clean or replace if necessary.
• Replace the plug-in toxic sensor.
6.4 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 CX-DM Series Splashguard Adapter Assembly with integral
filter. Clean or replace if necessary.
• Replace the plug-in toxic sensor.
6.5 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.
6.6 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’s Condensation Prevention Packet P/N 960-202200-000.
• Investigate the presence of other target gases that are causing cross-interference signals.
• Determine if cause is RFI induced.
6.7 Intelligent Transmitter Module (ITM) 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.
Contact the Detcon Service Department for further troubleshooting assistance at 713-559-9200.
CX-DM Instruction Manual Rev. 1.3 Page 28 of 40