Detcon FP-624D - Manual (Page 40)

Model FP-624D
FP-624D Instruction Manual Rev. 1.2 Page 36 of 42
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 range and cal gas level after Restore Factory Defaults.
If problem persists, replace the plug-in 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 transmitter module to determine if transmitter module is faulty.
Faulty 4-20mA Output
If sensor has a normal reading with no faults displayed, and the 4-20 mA signal output is 0mA….
Check that wiring is properly connected at terminal blocks and through to controller inputs.
The 4-20mA output loop must be closed (resistance of < 1000 ohms) to avoid the Loop Fault.
Perform a “Signal Output Check” sequence via Section 3.5.6 and verify 4-20mA output with current meter.
Swap with a known-good transmitter module to determine if the transmitter module’s 4-20mA output circuit is
faulty.