The fault of gas detector and how to solve it
What are the common faults of gas detectors? How to solve common faults of gas detectors?
The following common faults:
1. There is no measured gas in the air, but the value changes greatly or jumps;
2. No low-concentration gas can be detected;
3. When the value is 0 or the air alarm does not reach the alarm value;
4. The check is incorrect.
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 fluctuation amplitude is less than 1% of the maximum amplitude, which belongs to the normal range, and the drift time is longer when there is no gas measurement. Less than 2% of the maximum range is the normal range. When this range is exceeded, it is necessary to confirm whether there is measurement gas on site. The temperature and humidity in the air fluctuate greatly, and the values are unstable.
2. Confirm whether the gas detector is calibrated to zero or target. If there is a gas to be detected, the zeroing operation may not detect the low concentration gas. If there is a gas to be detected, perform target calibration, but the calibrated concentration value does not match the actual concentration value, the gas detector value fluctuates greatly or the detection value becomes smaller.
3. If the problem cannot be solved, check whether the gas detector is hit by high-concentration gas or high-concentration gas hits the gas sensor. If the gas sensor is impacted, after the gas sensor is activated and aged for 24 hours, if the value is unstable, the gas sensor may be damaged by the impact, and the gas sensor needs to be replaced.
No low concentration gas detected
1. Check whether the air pump of the gas detector works normally, block the air inlet with your finger for 5 seconds, if it feels obvious attraction, it is normal, if there is no attraction, check whether the air inlet is blocked.
2. Use nitrogen to calibrate the zero point or calibrate the zero point in clean air, and check after calibration.
3. After calibrating the zero point, if the gas to be measured cannot be detected, it is necessary to restore the factory settings of the gas detector.
4. The above steps have been performed but 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 it cannot be detected if it is lower than the minimum detection accuracy of the gas sensor.
Also alarms when the value is 0 or when the alarm value is not reached when air
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 the gas detection The alarm status 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 human 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 return to the factory for inspection.
Incorrect check
1. Confirm whether the gas concentration on site is correct. There is a big gap between the theoretical value and the actual value. Use standard gas to calibrate the gas detector to ensure the correctness of the detection, or send it to a third-party measurement agency 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 nearing the end of its service life, even if it is re-labeled for a short time, it can be used normally, but the measurement value of the gas detector will drift and the detection will be incorrect. It is recommended to replace the gas sensor.
