Serinus 44 User Manual 3.0
Faulty heater or
temperature sensor
Reaction cell temp failure
Faulty heater or
temperature sensor
1. Check that the instrument is not overheating.
2. Possibly a faulty power supply.
3. Corrupted firmware. Perform ‘erase all settings’ in
the Bootloader Menu and reload or upgrade
firmware.
12 Voltage supply failure
Verify that the mains power cable is connected and
the rear fan is operating
Adjust the display contrast by pressing two keys on
the front panel:
Press up arrow () for darker contrast
Press down arrow () for lighter contrast
Verify that the power supply is providing ±12V +5V
DC. TP40, TP23 and TP41
Check the interface cable between the display and
the microprocessor board.
Bad display or
microprocessor PCA
1. Replace the front panel display.
2. Replace the microprocessor board.
3. A bad cable is unlikely, but if you suspect it,
perform a pin-for-pin continuity test using an
ohmmeter.
Sample pressure
too high or too low
Loss of pressure
calibration
Ensure particulate filter has been recently changed.
Ensure tubing is not kinked or blocked. Ensure
vacuum pump is correctly installed and operating.
Perform a pressure calibration (refer to section 5.2).
Sample flow not at 0.9
SLPM
Check/replace sample filter.
Check pump.
Check valves.
Check/replace sintered filter.
Re-calibrate pressure sensors.
Unstable flow or pressure
readings
Check pressure transducer calibration. Check
calibration valve block is functioning and not
blocked. If unable to diagnose problem check voltage
across TP1 and TP2 of manifold pressure PCA ensure
it is about 4 volts ±0.5 volts. Check voltage across
TP1 and TP2 of cell pressure PCA (with vacuum
connected) ensure it is about 1 volts ±0.5 volts. If
unable to diagnose problem, it may be a noisy A/D
converter, replace main controller PCA.
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