for the four-in-one gas detector, after being used for a period of time, it needs to be regularly verified. during verification, we can refer to the corresponding national standards for the verification procedures of a single gas detector, specifically refer to the verification procedures of combustible gas Ex, hydrogen sulfide H2S, oxygen O2 and carbon monoxide CO respectively. Especially in order to ensure the subsequent use, we also need to do a good job in the verification of other projects. Then do you know what items need to be verified in the subsequent use of 4-in -1 gas detector ? The following is an introduction by Yi Yuntian:

The items that need to be verified in the subsequent use of the four-in-one gas detector are as follows:

1. Combustible gas Ex: check of alarm function and alarm action value, indication error, response time and repeatability.

2. H2S: alarm function, indication error, repeatability, response time.

3. Oxygen O2: indication error, repeatability, response time.

4. Carbon monoxide CO: alarm concentration value, alarm function, indication error, repeatability, response time.

In addition to the main verification items of the four-in-one gas detector mentioned above, the appearance and structure of the foundation, signs and markings should also be checked to ensure that all items are intact and clearly identifiable. Before the verification of the four-in-one gas detector, at least the gas standard substance, flow controller, zero gas, stopwatch, pressure reducing valve and gas circuit should be prepared. In this way, the normal operation of the subsequent work of the four-in-one gas detector can be better ensured.