Faults of gas detectors and how to solve them
The following common faults:
1. There is no measured gas in the air, but the value changes greatly or jumps;
2. Low concentration gas cannot be detected;
3. When the value is 0 or the alarm value is not reached in the air, it will also alarm;
4. The inspection is not correct.
How to solve common faults of gas detectors:
There is no measured gas in the air, but the value changes greatly or jumps
1. The short-term zero point fluctuation range is less than 1% of the maximum range, which belongs to the normal range. When the gas is not measured for a long time, the drift is less than 2% of the maximum range. And humidity fluctuates greatly, and the value is unstable.
2. Confirm whether the gas detector performs zero point calibration or target point calibration operation. If there is a detected gas, the zero point calibration operation may not be able to detect low-concentration gases. If there is a detected gas, perform target point calibration, but the calibrated concentration value is the same as The actual concentration value is inconsistent, 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 passes through high-concentration gas or high-concentration gas impacts the gas sensor. 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 the gas sensor needs to be replaced.
Low-concentration gases cannot be detected
1. Check whether the air pump of the gas detector is working normally. Use your finger to block the air inlet for 5 seconds. If it is normal, you will feel obvious attraction. If there is no attraction, check whether the air inlet is blocked.
2. Calibrate the zero point with nitrogen or calibrate the zero point in clean air, and check after calibration.
3. After the zero point is calibrated, if the measured gas cannot be detected, it is necessary to restore the factory settings of the gas detector.
4. The above steps have been performed, but it cannot be detected. It is necessary to confirm whether there is a gas to be measured on site, or the concentration of the gas to be measured is really low, and cannot be detected if it is lower than the minimum detection accuracy of the gas sensor.
When the value is 0 or the alarm value is not reached in the air, it will also alarm
1. Check whether the various 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 a concentration alarm or other fault alarm. The concentration alarm appears A1 or A2, and the red light flashes;
4. If the gas detector alarm is caused by manual 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 return to the factory for inspection.
Incorrect check
1. Confirm whether the on-site gas concentration is correct. There is a large gap between the theoretical value and the actual value. Calibrate the gas detector with standard gas to ensure the correctness of the detection, or send it to a third-party measurement institution for calibration.
2. If the gas sensor is used for a long time, there may be errors in the measured value. 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 in a short period of time after re-marking, but the measured value of the gas detector will drift and the detection will be incorrect. It is recommended to replace the gas sensor.
