The four-in-one detector should be avoided in the following environments:

1. The four-in-one detector should be avoided in environments such as high temperature, high humidity, steam and oil fume.

2. For the four-in-one detector that is not dust-proof, please do not use it in an environment with excessive dust density.

3. It is forbidden to use the four-in-one detector when detecting in an environment with unknown concentration, so as to prevent the on-site concentration from exceeding the range of the sensor and damaging the sensor.

4. It is forbidden to use the four-in-one detector in an environment outside the specified temperature range, otherwise, too high or too low temperature may damage the sensor.

5. The four-in-one detector should be avoided in electromagnetic environment. The influence path of electromagnetic environment on the four-in-one detector mainly includes: the static electricity generated by the human body, the interference of electromagnetic waves in the workplace, and the narrow pulse groups on the power supply and other input and output lines in the fixed gas detector are three. Therefore, the device orientation, device viewpoint, protection method and system wiring of the four-in-one detector should be prevented from electromagnetic interference.