Troubleshooting Guide - Teledyne 700 IR Series Instruction Manual

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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 count values for Ag and Rg (Ag should be 7-11 and
Rg should be 33-43)
• Replace the plug-in IR sensor
• If problem persists with new plug-in sensor, replace ITM
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
NP700IRIMEN
Revision E.0
INFRARED GAS DETECTOR FOR COMBUSTIBLE AND CO
700 IR Series
2
GASES
USER MANUAL
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