Inaccurate solution to fault detection of portable gas detector 1. Confirm whether the gas concentration at the site is accurate. Sometimes the difference between the theoretical value and the actual value is very large. It is best to verify the accuracy of the instrument by introducing a standard gas, or send it to a third-party metrology agency for testing. 2. If the sensor is used for a long time, there may be some error in the measured value. It is necessary to confirm with the manufacturer whether the sensor can still be used any more. If the sensor itself is approaching the service life, it can be used normally even after calibration. It will not take long before it can be used normally. It is recommended to replace the sensor. Zhejiang Lamon Technology Inc. , https://www.chairesbaby.com