4-4 Chapter 4: Troubleshooting SHB_U14
No measurement signal
Indication
No measurement signal when sample gas concentration changes.
No measurement signal during gas change (zero gas/span gas).
Status messages
After calibration messages 1, 2, 4 or 8 may appear.
Details
Possible cause Measures
Power supply failure Connect 24-V power supply
Defective emitter Replace emitter
Emitter power supply voltage failure - Check connections
- Replace IR module circuit board
- Replace Sensor-CPU circuit board
Chopper wheel does not turn - Check power supply voltage
- Replace motor
- Repair drive coupling
- Make sure chopper wheel turns freely
Check operation.
Defective IR detector Replace IR detector
Defective preamplifier Replace IR detector
Defective IR module circuit board Replace circuit board
Defective Sensor-CPU circuit board Replace circuit board
Defective EEPROM on Sensor-CPU
board
Replace EEPROM and/or reload data
set
Defective cable between emitter/IR
detectors and IR module circuit board
Establish connection
No flow through sample chamber Check sample gas path
Check sample gas supply
Sample gas path leak Repair leaks
Possible bypass at sample gas inlet
generating vacuum
Optimize the bypass
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