Common faults and solutions of gas detectors
Fault 1. Low concentration gas cannot be detected
solutions:
1. Check whether the air pump of the gas detector is working normally, block the air inlet with your fingers for 5 seconds, if you feel obvious suction normally, if there is no suction, check whether the air inlet is blocked;
2. Pass nitrogen to calibrate the zero point or calibrate the zero point in clean air, and test after calibration;
3. If the gas to be measured cannot be detected after the zero point calibration, it is necessary to restore the factory settings of the gas detector;
4. The above steps can not be detected. It is necessary to confirm whether there is a gas to be tested on site, or the concentration of the gas to be tested is really low. If it is lower than the small detection accuracy of the gas sensor, it cannot be detected.
Fault 2. In the air, there is no gas to be measured, but the value fluctuates greatly or jumps around
solutions:
1. The short-term zero fluctuation range is less than 1% of the large range, which belongs to the normal range. In the absence of the measured gas, the long-term drift is less than 2% of the large range. It belongs to the normal range. Gas, or the temperature and humidity in the air fluctuate greatly, resulting in unstable values;
2. Confirm whether the zero-point calibration or target-point calibration operation of the gas detector is performed. If the zero-point calibration operation is performed in the case of the measured gas, the gas with low concentration may not be detected. The calibration of the target point has been performed, but the calibrated concentration value does not match the actual concentration value, which may cause the gas detector value to fluctuate greatly or the detected value to be too small. These two situations can be solved by restoring to the factory;
4. If the problem cannot be solved, it is necessary to confirm whether the gas detector has been introduced with high concentration gas or has impacted the gas sensor. If the gas sensor has been impacted, turn on the gas detector and run it for 24 hours. If the value is not stable, the gas sensor may be damaged by impact, and the gas sensor needs to be replaced.
Fault 3. Inaccurate detection
solutions:
1. Confirm whether the gas concentration on site is accurate, and the difference between the theoretical value and the actual value is very large. Calibrate the gas detector by passing in standard gas to ensure the detection accuracy, or send it to a third-party measurement agency for verification and 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 approaching its service life, it can be normal in a short time even after re-calibration. It is used, but the measured value of the gas detector will drift and the detection is inaccurate. It is recommended to replace the gas sensor.
Fault 4. When the value is 0 or the alarm value is not reached in the air, it will also alarm
solutions:
1. Check whether the various alarm value 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 status of the gas detector is a concentration alarm or other fault alarms, the concentration alarm will appear A1 or A2, and the red indicator light will flash;
4. If the gas detector alarm is caused by human operation modification, it can be solved by restoring the factory settings. The fault alarm needs to be further checked for short circuit, open circuit, poor contact, sensor failure, etc., or send it back to the manufacturer for inspection.
The above is the introduction of "Common Faults and Solutions of Gas Detectors" provided by Nanjing Safeme Technology. I hope it will be helpful for you to understand gas detectors! Zero calibration of the gas detector at any time, and regular calibration of the gas detector are the only tasks to ensure the accurate measurement of the instrument.
