Model IR-700
IR-700 Instruction Manual Rev. 4.3 Page 35 of 46
6. Troubleshooting Guide
Refer to the list of Failsafe Diagnostic features listed in Section 3.6.2 for additional reference in troubleshooting
activities. Listed below are some typical trouble conditions and their probable cause and resolution path.
Zero Fault
• Probable Cause: Sensor Zero has drifted to <-10% LEL.
• Redo AutoZero.
• Replace the plug-in IR sensor if problem persists.
Sensor Fault
Probable Causes: Plug-in sensor has failed.
• Recycle power to see if fault clears.
• Check “View Sensor Status” for a report of Active and Reference Counts (active and reference counts
should be about 3000 with no gas applied).
• Perform ‘Set Sensor Gain’ and note that the typical values are Ag = 7-14, and Rg = 30-45 (Rg maximum
should be 65).
• Replace the plug-in IR sensor.
• If problem persists with new plug-in sensor, replace ITM.
AutoSpan Calibration Faults – (Range, Stability, and Clearing)
• To clear any AutoSpan Calibration fault, the AutoSpan process must be completed successfully.
Range Fault
Probable Causes: Cal Gas not applied or not applied at appropriate time, Failed Sensor, Problems w/ cal gas
and delivery
• Perform AutoSpan following the instructions explicitly.
• Check that cal gas value matches the AutoSpan level.
• If using Splashguard with Integral Cal Port, must use Calibration Wind Guard or air movement can
compromise span gas delivery.
• Verify correct Gas Type and Gas Factor is entered.
• Check validity of span gas and flow rate (check MFG date on cal cylinder).
• Check for obstructions through stainless steel sinter element (including being wet).
• Replace the plug-in IR sensor, and/or bottom housing.
Stability Fault
Probable Causes: Failed Sensor, empty or close to empty Cal Gas Cylinder or problems with cal gas and delivery
• Perform AutoSpan following the instructions explicitly.
• Check that cal gas value matches the AutoSpan level.
• If using Splashguard with Integral Cal Port, must use Calibration Wind Guard or air movement can
compromise span gas delivery.
• Verify correct Gas Type and Gas Factor is entered.
• Check validity of span gas and flow rate (check MFG date on cal cylinder).
• Check for obstructions through stainless steel sinter element (including being wet).
• Replace the plug-in IR sensor, and/or bottom housing.
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