GM MANTS420 manual Sensor Care and Maintenance, Fault Codes & The Remedies, Fault Codes are

Model TS420

Figure 11, Calibration Kit with Bottle

6.Screw on TS420 sensor cap.

7.Apply power to the unit and allow the sensor to stabilize prior to initial calibration. The stabilization time should be at least one (1) hour for all sensors.

8.Calibrate new sensor (see Section 4.3).

NOTE - The TS420 will stay in fault anytime the sensor is removed. Calibration is required to reset the TS420.

4.6Sensor Care and Maintenance

If power is removed from the TS420 for periods greater than one hour, the sensor should be removed from the TS420 and placed in the original storage container shipped with the sensor. Storage of the sensor in the original container guards against sensor contamination from solvents, lubricant humidity, etc.

NOTE - Do not short the sensor pins.

In the case of long intervals of non-use, the sensors should be stored as described above in a cool, dry place, preferably refrigerated between 0 and 20°C.

In all cases, after the sensor has been removed from the TS420, the cap should be replaced on to the TS420 body and the gas port taped off to prevent any corrosion damage to the exposed socket pins.

4.7Fault Codes & The Remedies

The TS420 has self-diagnostics incorporated into the microprocessor program. If a fault is detected, the output signal will drop to 3.5mA and the MODE LCD will be flashing to indicate the fault.

When a calibration fault has occurred and has been corrected, the unit will stay in fault until it has been successfully calibrated.

The Fault Codes are:

Fault (No Power): Neither LCD will be on. Output signal will be 0.0mA.

Remedy: Check wiring, ensure power is applied to unit.

Fault (System): The “MODE” LCD will be flashing. Output signal will be 3.5mA.

Remedy: Attempt recalibrating the detector. If the fault persists, replace the sensor and after sensor has stabilized (one (1) hour minimum). Recalibrate. If fault still persists, contact factory or your sales representative.

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