Introduction to Common Faults and Solutions of Gas Detectors
Gas detectors are commonly used in industrial production, and corresponding safety protection equipment is used based on their detection results. What are the common faults of gas detectors? How can we solve common faults in gas detectors?
Fault 1: Low concentration gas cannot be detected
Solution:
1. Check if the gas pump of the gas detector is working properly, block the air inlet with your fingers for 5 seconds. If there is obvious suction, if there is no suction, check if the air inlet is blocked;
2. Inject nitrogen to calibrate the zero point or calibrate the zero point in clean air, and perform testing after calibration;
3. If the measured gas cannot be detected after calibrating the zero point, the gas detector needs to be restored to its factory settings;
4. The above steps have been completed but cannot be detected. It is necessary to confirm whether there is any gas being measured on site, or if the concentration of the gas being measured is indeed very 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 measured gas, but the value fluctuates greatly or jumps randomly
Solution:
1. The short time zero point fluctuation range is less than 1% of the large range, which is a normal range. Long time drift is less than 2% of the large range without the measured gas, which is a normal range. If it exceeds this range, it is necessary to confirm whether there is the measured gas on site, or if the temperature and humidity in the air fluctuates significantly, causing numerical instability;
2. Confirm whether zero calibration or target point calibration has been performed on the gas detector. If zero calibration is performed in the presence of the measured gas, it may not be possible to detect low concentration gas. If target point calibration is performed in the presence of the measured gas, but the calibrated concentration value does not match the actual concentration value, it may cause significant fluctuations in the gas detector value or a small detected value, These two situations can be resolved by restoring the factory operation;
3. If the problem cannot be solved, it is necessary to confirm whether the gas detector has been filled with high concentration gas or if there is a high concentration gas that has impacted the gas sensor. If there is a gas sensor that has been impacted, the gas detector may be damaged by the impact after being turned on and aged for 24 hours. If the value is still unstable, the gas sensor may need to be replaced.
Fault 3. Inaccurate detection
Solution:
1. Confirm whether the gas concentration on site is accurate, and the difference between the theoretical value and the actual value is significant. Calibrate the gas detector by introducing standard gas to ensure detection accuracy, or send it to a third-party measuring institution for calibration;
2. If the gas sensor is used for a long time, there may be errors in the measurement values. It is necessary to confirm with the manufacturer whether the gas sensor can still be used. If the sensor itself is approaching its service life, even if it can be used normally for a short period of time after recalibration, the measurement values of the gas detector may drift and detect inaccuracies. It is recommended to replace the gas sensor.
