Detcon TP-624D - Manual (Page 38)

Model TP-624D
TP-624D Instruction Manual Rev. 0.4 Page 34 of 40
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 3.5.5 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.