Selection Criteria for Toxic and Harmful Gas Detectors
The requirements for safety and hygiene vary in different types of places. In some places, the gas content is a crucial indicator, which can affect the safety of the employees working there. There are also requirements for explosion prevention, etc. Therefore, various enterprises and government inspection departments need to be equipped with toxic and harmful gas detectors to facilitate the monitoring of the gas conditions in these places. The following is a brief introduction to the selection methods of toxic and harmful gas detectors.
First of all, it is necessary to determine the place where the gas detector will be used.
In different places, the types of gases to be detected are also different. In some explosion-proof areas, the detector also needs to be of an explosion-proof grade. In some places that are not convenient for people to enter and exit, it is recommended to use online gas detection instruments.
The second step is to confirm the types of gases to be detected and their respective concentration requirements.
For different types of gases, according to the impacts they cause, there will be different concentration requirements. In some places, as long as it is necessary to detect whether there is gas leakage, a higher sensitivity for detecting low concentrations of the instrument is required.
There are mainly two types of gas detectors that are most commonly used. One is the portable gas detector, and the other is the fixed (online) gas detector.
At present, most enterprises use portable gas detectors. This type of instrument is small in size and easy to operate. It can be carried to different places for detection. For detectors using the electrochemical principle, the battery can generally be used continuously for more than a thousand hours, and some batteries can also be recharged. It is widely used by large enterprises. However, it also has its disadvantages. Disadvantage 1: It is not a continuous measurement. For example, some enterprises only measure once a day, so it cannot truly reflect the actual gas content throughout the day. Disadvantage 2: Due to its mobile design, it is likely to accelerate the inherent errors of the electronic components of the instrument, and it needs to be calibrated more frequently. Otherwise, the measurement accuracy is questionable. Disadvantage 3: The voltage and current of the battery will fluctuate or weaken, which will affect the measurement results. Disadvantage 4: In some production areas, it is not convenient to use a portable detector for detection.
