DM-634C Oxygen Sensor Assembly
DM-634C O2 Sensor Instruction Manual Rev. .066
Page 21 of 25
3.13
Trouble Shooting
Memory or Error Reports
1. Re-initialize Sensor - Unplug transmitter and re-plug transmitter then swipe magnet over PGM 1 in the
first 3 seconds. This will clear the processor and recover from error state. Remember to put in all
customer settings for range, alarm and cal gas level after re-initialization.
Non-readable Display
1.
If display has blue background when hot, install sunshade to reduce temperature.
2.
If poor contrast, adjust contrast pot accordingly.
Nothing Displayed – Transmitter not responding
1.
Verify condulet has no accumulated water or abnormal corrosion.
2.
Verify required DC power is applied to correct terminals.
3.
Swap with a known-good transmitter to determine if transmitter is faulty.
Bad 4-20 mA Output or RS485 Output
1.
Check that wiring is connected to correct terminal outputs.
2.
Swap with a known-good transmitter to determine if transmitter is faulty.