Analysis of conventional four-in-one gas detector?

Analysis of conventional four-in-one gas detector?

The four-in-one gas detector is also called a composite gas detector. The gases routinely detected include combustible gas EX, carbon monoxide CO, hydrogen sulfide H2S, and oxygen O2. So what are the numerical standards and detection range of the four-in-one gas detector? Analysis of conventional four-in-one gas detector?

Glossary
Occupational exposure limit: the unrestricted value of occupational harmful factors, which refers to the allowable exposure level that does not cause harmful effects on the health of the vast majority of exposed workers through long-term and repeated exposure in the course of occupational activities.

Occupational exposure limits for chemical hazards include time-weighted average allowable concentration, short-term exposure allowable concentration and maximum allowable concentration.

1. Time-weighted average allowable concentration: the average allowable exposure concentration for an 8-hour working day and a 40-hour working week specified with time as the weight;

2. Permissible concentration for short-term exposure: the concentration allowed for short-term (15min) exposure under the premise of complying with the national standard;

3. The maximum allowable concentration: the concentration of toxic chemical substances that should not be exceeded at the workplace, within a working day, and at any time;

4. Exceeding multiples: For unspecified chemical harmful factors, in the case of complying with the 8h time-weighted average allowable concentration, the concentration of any short-term (15min) exposure should not exceed the multiple value.