What is the correct choice of gas detector?
A gas detector is an instrument tool for gas leakage concentration detection, mainly referring to portable gas detectors and fixed gas detectors. Gas sensors are mainly used to detect the types of gases present in the environment. Gas sensors are sensors used to detect the composition and content of gases.
1. What gases are contained in the portable four-in-one gas detector?
Some people are not sure about the commonly mentioned standard four-in-one gases and the range of gas detection. Simply put, the standard four-in-one gases are: flammable (methane) 0-100% LEL, carbon monoxide (CO) 0-1000PPM, oxygen (O2) 0-30% VOL, hydrogen sulfide (H2S) 0-100PPM; suitable for use in many places. When workers enter confined spaces, such as reaction tanks, storage tanks or containers, sewers or other underground pipelines, railway tank cars, shipping cargo holds, tunnels and other workplaces, on-site gas detection must be carried out before the personnel enter, and must be carried out in Test outside a confined space. At this time, a multi-gas detector with a built-in pump must be selected. Because the gas distribution and gas types in different parts (upper, middle, and lower) of the confined space are very different. In general, combustible gases have a lighter specific gravity and are mostly distributed in the upper part of a confined space; carbon monoxide and air have similar specific gravity and are generally distributed in the middle of a confined space; while heavier gases such as hydrogen sulfide exist in the middle of a confined space. lower part. At the same time, oxygen concentration is also one of the types that must be detected.
2. The difference between natural diffusion type and pump suction type
Everyone knows that there are two most common detection methods for gas detectors, one is the natural diffusion type and the other is the pump suction type. But what is the difference between the two? The natural diffusion type slowly senses the gas without applying any external force. For gas, the pump suction type uses a self-priming pump to inhale independently. For example, the human nose responds faster, so when choosing, you must pay attention to the detection method to effectively detect the gas. Generally, fixed detectors use the natural diffusion type, while portable detectors use the pump suction type.
3. What is the use of oxygen to measure nitrogen?
Oxygen and nitrogen are relatively common gases. The main components in the air are 30% oxygen and 70% nitrogen. Since the price of nitrogen-specific sensors is relatively high, some people will choose to use oxygen sensors to counter-measure nitrogen. In fact, it is possible. 100 minus the oxygen content value is the nitrogen content value.
