Model IR-700
IR-700 Instruction Manual Rev. 4.3 Page 36 of 46
Clearing Fault
Probable Causes: Failed Sensor, Cal Gas not removed at appropriate time, problems with cal gas and delivery,
or Background combustible gases preventing clearing
• Perform AutoSpan following the instructions explicitly.
• Remove calibration adapter and gas connections.
• Confirm no combustible gasses in background.
• 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.
Poor Calibration Repeatability
Probable Causes: Failed Sensor, use of wrong Cal Gas, problems w/ cal gas and delivery, Sensor Corrosion
• Check for adequate Sensor Life.
• Increase calibration frequency to quarterly.
• 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.
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’s RFI Protection Circuit accessory.
Nuisance Alarms
• Check condulet for accumulated water and abnormal corrosion on terminal blocks.
• 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 presence of other combustible hydrocarbon gases that may be causing sensor response.
Processor and/or Memory Faults
• Recycle power in attempt to clear problem
• Restore Factory Defaults – This will clear the processor’s memory and may correct problem.
• Remember to re-enter all customer settings for cal gas level, set gain, Serial ID after Restore Factory
Defaults.
• If problem persists, replace the Intelligent Transmitter Module.
Unreadable Display
• If due to excessive sunlight, install a sunshade to reduce glare.
Nothing Displayed – Transmitter not Responding
• Verify condulet has no accumulated water or abnormal corrosion.
• Verify required DC power is applied to correct terminals.
• Swap with a known-good ITM to determine if ITM is faulty.
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