Common faults of gas detector and how to solve them
1. There is no measuring gas in the air, but the value changes greatly or jumps;
2. Low concentration gas can't be detected;
3. Alarm is also given when the value is 0 or the alarm value is not reached in the air;
4. The inspection is incorrect.
How to solve the common faults of gas detector;
There is no measuring gas in the air, but the value changes greatly or jumps.
1. The short-time zero change range is less than 1% of the maximum range, and the long-time drift of unmeasured gas is less than 2% of the maximum range. If it exceeds this range, it is necessary to confirm whether there is measured gas on site, and the temperature and humidity in the air change greatly, and the value is unstable.
2. Confirm whether the gas detector performs zero calibration or target point calibration operation. If there is detected gas, the zero calibration operation may not be able to detect low-concentration gas; if there is detected gas, the target point calibration will be performed, but the calibrated concentration value is inconsistent with the actual concentration value, and the value of the gas detector changes greatly or the detected value becomes smaller.
3. If the problem cannot be solved, confirm whether the gas detector impacts the gas sensor through high-concentration gas or high-concentration gas. If the gas sensor is impacted, after the gas sensor is started and aged for 24 hours, if the value is unstable, the gas sensor may be impacted and damaged, and it is necessary to replace the gas sensor.
Low concentration gas cannot be detected.
1. Check whether the air pump of the gas detector works normally, and block the air inlet with your fingers for 5 seconds. If it feels attractive normally, if it doesn't, check whether the air inlet is blocked.
2, nitrogen calibration zero or calibration zero in clean air, check after calibration.
3. After calibrating the zero point, if the measured gas cannot be detected, it is necessary to restore the factory settings of the gas detector.
4. All the above steps have been operated, but it can't be detected. It is necessary to confirm whether there is any gas to be detected at the scene, or the concentration of the gas to be detected is really low, and it can't be detected below the minimum detection accuracy of the gas sensor.
When the value is 0 or the alarm value is not reached in the air, the alarm is also given.
1. Check whether the alarm parameters of the gas detector have been modified;
2. Check whether the alarm mode and alarm mode of the gas detector have been modified;
3. Check whether the alarm state of the gas detector is concentration alarm or other fault alarm. The words A1 or A2 appear in the concentration alarm, and the red light flashes;
4. If the alarm of the gas detector is caused by manual operation modification, it can be solved by restoring the factory installation. The fault alarm needs to be further checked for short circuit, open circuit, poor contact, sensor failure, etc., or returned to the factory for inspection.
Incorrect check
1. Confirm whether the gas concentration on site is correct, and there is a big gap between the theoretical value and the actual value. Calibrate the gas detector with standard gas to ensure the detection accuracy, or send it to a third-party metering institution for calibration.
2. If the gas sensor is used for a long time, the measured value may have errors. It is necessary to confirm with the manufacturer whether the gas sensor can continue to be used. If the sensor itself is close to its service life, it can be used normally even in a short time after re-labeling, but the measured value of the gas detector will drift and detect incorrectly, so it is recommended to replace the gas sensor.
