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Hazardous gas detection alarm selection principles

1, a clear test purposes, select the instrument type
In short, the detection of harmful gases has two purposes, first test explosion, the second is to test drugs. The so-called test explosion is to detect gas levels can be dangerous places, excessive alarm, in order to avoid the occurrence of explosion; drug testing is to detect toxic gases in dangerous places, excessive alarm, in order to avoid poisoning. Explosion range is measured 0 ~ 100% LEL, measured range is 0 to poison tens (or hundreds) ppm, two very different¡£

Dangerous places, there are three cases of harmful gases£¬
¡¡ First, non-toxic (or low) fuel£¬
¡¡ Second, non-combustible toxic£¬
¡¡ Third, flammable poisonous. Easy to determine the first two cases£¬
The first test explosion, the second drug test, the third case if there are people measuring drug exposure, such as the explosion can be measured without human exposure¡£
Test explosion of combustible gas detection alarm device selection, drug selection measure toxic gas detection alarm¡£
2, a clear choice test uses equipment type (portable or fixed£©
Production or storage of long-running positions selected fixed leak detection monitors and alarms; other testing such as maintenance, emergency detection, access to testing and use of portable detection circuit (or pocket) instruments¡£
3, a clear detection of objects, selecting equipment models
Instrument models include the manufacturer, functional indicators and detection principle of three main components£¬
Select equipment model to consider the following principles
¡ôManufacturer in good faith, credibility, and the production of quality assurance, through the ISO9002 quality system certification, with technical supervision departments production license issued by the CMC, with a fire, explosion-proof certification¡£
¡ôSelected models feature indicators to meet the national standard GB12358-90, GB15322-94, GB16808-1997 and other standards¡£
¡ôDetection principle instrument to adapt to the environment detected objects and testing requirements¡£


Overview of hazardous gas sensor£º
Hazardous gas sensor is in the air of harmful gases into the electrical signal device. The sensor signals generated by the electronic circuit processing, amplification and conversion, the realization of harmful gas content of the display and alarm. Can be seen, the sensor is harmful gas detection alarm basis, the core component, it determines the merits of hazardous gas detection alarm indicators of the quality and functionality¡£
Sensors in the field, to withstand harsh environments and the impact of the atmosphere, especially in fixed sensor equipment, long-term continuous operation, another explosion, and power supply capacity constraints, and therefore harmful gas sensor was very strict¡£

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