1. What gases are included in the standard four-in-one?
Some people are not very clear about the standard four-in-one gas and gas detection range of the gas that is often said %VOL, hydrogen sulfide 0-100PPM. Suitable for use in many places. When personnel enter confined spaces, such as reaction tanks, storage tanks or containers, sewers or other underground pipelines, railway tankers, shipping cargo holds, tunnels, etc., on-site gas detection must be performed before personnel enter. Testing outside confined spaces. At this point, a variety of gas detectors with built-in pumps must be selected. Because the gas distribution and gas types in different parts (upper, middle and lower) in the confined space are very different. In general, the specific gravity of flammable gases is light, and most of them are distributed in the upper part of the closed space; the specific gravity of carbon monoxide and air is similar, and generally distributed in the middle of the closed space; and heavier gases such as hydrogen sulfide exist in the closed space. lower part. At the same time, the oxygen concentration is also one of the types that must be detected.
Second, the difference between natural diffusion and pump suction
Gas detectors all know that there are two most common detection methods, one is natural diffusion type and the other is pump suction type, but I don’t know what the difference between the two is. When gas is sensed, the pump suction type uses a self-priming pump to inhale independently. For example, the human nose responds faster, so when choosing, you need to look at the detection method to effectively detect the gas.
3. What is the use of oxygen to measure nitrogen?
Oxygen and nitrogen are more common gases. The main components in the air are 30% oxygen and 70% nitrogen. Due to the high price of nitrogen-specific sensors, some people choose to use an oxygen sensor to measure nitrogen. In fact, it can be used immediately. 100 minus the oxygen content value is the oxygen content value.
4. Is the gas detector explosion-proof?
The gas detector depends on whether it has reached the explosion-proof grade. The general explosion-proof grades of the detector are BT3, BT4, and CT3, so we can look at these explosion-proof grades when purchasing and testing.
