Instruction manual

12.0 TROUBLESHOOTING SM425 INSTRUCTION MANUAL
42500001 REV A 195
< Troubleshooting and Correctiv
1. Confirm the following and correct as necessary. Then re-calibrate:
a. The “Span gas conc.” programmed in “Calibration setup” menu agrees with the
concentration of span gas in use.
b. There are no leaks in the span gas tubing.
2. No further action is required if the alarm clears following the re-calibration.
3. The sensor cell assembly requires replacement if re-calibration did not clear the alarm. Follow the
procedure described in steps 3 to 6 of < Troubleshooting and Corrective Actions > in Section
1.63.2.2, “Alarm 6: Zero-point Calibration Coefficient Alarm.”
tion gas is less than the specified flow of 600 ± 60 mL/min.
< Troubleshooting and Corrective Actions >
1. Re-calibrate using calibration gas at the specified flow (600 ± 60 mL/min) after verifying there are
no leaks in the tubing.
2. If the alarm occurs again, verify dust or particulate is not accumulating on the tip of the calibration
gas tube. If dust is found, clean the tube (see Section 1.59.1).
In addition, the influence Do not let process gas flow
towards the tip of the dete r may need to be changed.
3. If the alarm persists, replace the sensor assembly.
12.2.2.5
llowing:
cable is not
2. The positive and negative poles of the cold junction signal wiring are shorted out in the wiring
extension or at the connection terminals.
e Actions >
12.2.2.4 Alarm 8: EMF Stabilization Time Over
This alarm is generated if the sensor (cell) voltage has not stabilized during the calibration time.
<Cause of alarm>
1. The flow of the calibra
2. The length or thickness of the calibration gas tubing has been changed (lengthened or
thickened).
3. The process gas is flowing towards the tip of the probe.
4. The sensor (cell) response is failing.
of process gas flow may be suspected.
ctor probe. The mounting of the detecto
Alarm 10: Cold Junction Temperature Alarm
This alarm is generated when the temperature of the cold junction located at the terminal block of the
detector is outside of the -25°C to 155°C range. Select “C.J.Temperature” in the detailed data display
then check the fo
If “C.J. Temperature” is 200°C or -50°C, the following may be the problem:
1. Open cold junction signal wires between the converter and the detector or the
securely connected to the terminals.