Pepperl + fuchs: basic knowledge of explosion and explosion protection

The safety barrier is connected between the intrinsically safe circuit and the non-intrinsically safe circuit, and is a device that limits the voltage and current supplied to the intrinsically safe circuit within a certain safety range. Pepperl+fuchs safety barrier has the function of explosion-proof. First of all, we must first understand some basic knowledge of explosion and explosion-proof, so as to have a better initial understanding of the product.

1. How did the explosion happen?

The explosion will occur when the following three conditions are met at the same time:

1. There is a source of detonation on site, such as sparks with sufficient energy or high enough surface temperature of the object;

2. There is oxygen on site;

3. There are explosive substances on site, such as explosive gas.

2. Classification of the hazard of explosive gases

Various explosion-proof methods determine specific explosion-proof safety parameters according to the danger of explosive mixtures.

To evaluate the danger of explosive gas, three characteristics related to the possibility of explosion are mainly considered:

1. The sensitivity of the mixture of explosive gas and air to spark energy. The smaller the energy of the spark that may be detonated, the more explosive the gas.

2. The sensitivity of the mixture of explosive gas and air to the surface temperature of the object. The lower the surface temperature of the object that may be detonated, the more the gas will explode.

3.The explosive concentration range of explosive gas mixed with air. The wider the explosive range, the more explosive the gas.