How to Set up a Flammable Gas Detector?

First of all, it is necessary to know which gas can be measured, including methane, isobutane, propane, hydrogen, benzene, ketone and alcohol. Secondly, the concentration of the measured gas is determined. Generally, the lower explosive limit (%LEL) is detected in most cases. Note: the lower explosive limit of different gases is different. There are also partially detectable parts per million (PPM) levels, with 1%=10000ppm. If it's %LEL, the range is 0-100%LEL; If it's PPM, it's usually 0-100ppm or 0-1000ppm.

In short, if the type and concentration of measured combustible gas can be made clear, the corresponding type and range alarm can be selected. The principle is mostly catalytic combustion type.

What are underreporting and overreporting based on? Today, ATO gas detection expert will answer this question together.

We often see the natural gas detector, liquefied gas detector and other combustible gas detector measurement range standard is 0-100%LEL, so what is the meaning of 0-100%LEL?

When the concentration of combustible gas in the air reaches its explosion lower limit, we call the explosion risk of the combustible gas environment in this site as 100%, namely 100%LEL. If the content of combustible gas only reaches 10% of its lower explosive limit, we call the explosive risk of this site in the combustible gas environment at this time 10%LEL; For the monitoring of combustible gas in the ambient air, the environmental risk of combustible gas is often directly given, that is, the content of the combustible gas in the air and the percentage of its lower limit of explosion are expressed as: [%LEL]; Therefore, this kind of monitoring is sometimes called "explosion detection", and the monitoring instrument used is also called "explosion detection instrument".

The upper limit of explosion is the higher concentration of combustible gas when exposed to open flame in air. English: Upper Explosion Limited.

Explosion limit is for combustible gas, which is very important for the setting of gas alarm. Explosion limit is a very important concept, which has great practical significance in fire and explosion protection work. Explosion limits are generally expressed as a percentage of the volume of combustible gas in the air, or as a percentage of the weight of combustible gas.

Explosion limit is the general term for lower limit and upper limit of explosion. The concentration of combustible gas in the air will explode only when the lower limit or upper limit of explosion occurs. No explosion will occur if the concentration is lower than the lower limit or higher than the upper limit.

The explosion limit of flammable gas is divided into upper explosion limit and lower explosion limit. Above the upper limit, there is not enough oxygen in the mixture to cause combustion or explosion. Below the lower limit of explosion, the mixture contains insufficient combustible gas to cause combustion or explosion. The combustion and explosion of combustible gas are also related to gas pressure, temperature, ignition energy and other factors.

The lower limit of explosion is generally expressed by unit %LEL, and the fixed gas alarm is usually equipped with two alarm points: 10%LEL for the first alarm, 25%LEL for the second alarm; Portable detectors usually have a 25%LEL alarm point.