11-2
11 Troubleshooting and Fault Diagnosis
General troubleshooting guide and specific fault code table for the Midas
®
gas detector. Please check
Honeywell Analytics’ website or contact Honeywell Analytics for details on the current software revision.
Table 11-1. Fault code descriptions.
Fault
code
Description Condition Recovery
m9
Simulated maintenance fault User has generated a simulated fault. Reset simulated fault.
m10
Over range.
A large concentration has been detected. The
Midas
®
requires an independent confirmation that
the gas hazard is gone.
Supply known clean air to the Midas
®
and clear this fault.
m11
User calibration expired. The user specified calibration interval has elapsed. Perform zero and span calibrations. Increase span calibration period.
m12
Cartridge expires soon. Cartridge is old and will expire soon. Replace the cartridge with a new cartridge.
m13
Flow error.
Midas
®
is no longer able to regulate flow (high or
low flow condition).
Check filters and pump.
Check pressure at inlet and outlet and assure they are within specification.
(See Section 4.3 Sample and exhaust tubing calculations)
m14
Interferent present.
An interferent is degrading the ability of the
Midas
®
to detect gas.
Check application.
m15
Temperature near limit. Temperature within 2 Celsius of limit. Check installation environment.
m16
Baseline fault. Sensor baseline has drifted.
Check for background gas concentration, temperature or humidity fluctuations.
Perform zero calibration. Replace cartridge.
m17
Inhibit timeout. Transmitter has been in inhibit mode too long. Resume monitoring or increase timeout value.
F39
Simulated fault User has generated a simulated fault. Reset simulated fault.
F40
Sensor overdosed.
Sensor has been exposed to high gas
concentrations for long periods.
Replace cartridge.
F41
Baseline fault. Sensor baseline has drifted.
Check for background gas concentration, temperature or humidity fluctuations.
Perform zero calibration. Replace cartridge.
F42
Calibration expired. Too long since last calibration. Replace or calibrate the cartridge.
F43
Cartridge expired. Cartridge is too old. Replace cartridge.
F44
Cell failure. Cartridge has failed Reflex™ check. Replace cartridge.
F45
Stabilization timeout. Cartridge has failed to stabilize.
If temperature or humidity shocks exist, precondition the cartridge. Check for
background gas concentration. Replace cartridge.
F46
Cartridge analog failure.
Electronic Failure or gas concentration greater
than full scale.
Replace cartridge.
F47
Cartridge memory invalid. Checksum error. Replace cartridge.
F48
Cartridge absent. No communications. Reseat cartridge. Replace cartridge.
F49
Cartridge wrong type. Cartridge type found to be incorrect after boot-up. Replace cartridge or press ‘3’ accept if correct.
F80
Temperature limits
exceeded.
Temperature is outside limits Check installation environment.
F81
Flow fail. Flow < 70% of nominal for 15 seconds. Check filters. Check for kinked tubing, Replace pump.
F82
Excessive electrical noise. Internal electronics repeatedly noisy. Check grounding of Midas
®
chassis. Check termination of cable shields.
Relo
cate the Midas
®
further from noise sources. Add ferrite inductors to cables.
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