Harmful gas detector selection principle

Harmful gas detector selection principle 1, a clear purpose of detection, choose the type of instrument In short, the detection of harmful gases has two purposes, the first is the explosion test, and the second is the drug detection. The so-called explosion test is to detect the gas content of dangerous places and exceed the standard alarm so as to avoid the occurrence of explosion accidents; the detection of poison is to detect the contents of all poisonous gases in the dangerous place and exceed the standard alarm so as to avoid the poisoning of workers. The range of explosion detection is 0-100% LEL, and the range of poison detection is 0-several (or several hundred) ppm. There is a big difference between the two.

There are three kinds of hazardous gases in hazardous areas: first, non-toxic (or low-toxic) flammable, second, non-flammable, toxic, and third, flammable and toxic. The first two conditions are easy to determine, the first test explosion, the second test poison, the third case if there is a person exposed to test poison, if no personnel exposure can be measured.

Select the combustible gas detection alarm device for the explosion test, and select the toxic gas detection alarm device for the poison detection.

2. Specify the type of instrument for specific detection purposes (portable or fixed)

Leakage detection for long-term operation of production or storage positions uses fixed detection alarms; other options such as maintenance inspections, emergency detections, entry detections, and touring inspections use portable (or pocket) instruments. The model number of the instrument includes the three main contents of the manufacturer, function index and detection principle.

3, clear test objects, the best choice for the selection of instrument model instrument type to consider the following principles:

1 The manufacturer speaks of good faith, good reputation, and the quality of production is guaranteed. It has passed the ISO9002 quality system certification, and has a CMC production license issued by the technical supervision department, and has a fire-fighting and explosion-proof certificate.

2 The detection principle of the instrument must be adapted to the requirements of the test object and the test environment.