Views: 0 Author: Site Editor Publish Time: 2023-02-24 Origin: Site
With the application and continuous development of explosion-proof electronic scales, explosion-proof load cells are also developing with the times. They are generally suitable for use in hazardous environments where flammability and explosiveness have certain requirements for explosion-proof. They are characterized by high explosion-proof grade, stable performance and simple installation, and have been used in many application fields. So, what is the working principle of explosion-proof load cell?
Explosion proof load cells generally achieve explosion-proof purpose by controlling explosive gas, explosive range and explosive source. The explosive gas control is based on the fact that the explosive gas composition can be checked in a sealed explosion-proof box by the explosion-proof weighing sensor, so as to identify and check the dangerous factors and eliminate the potential explosion hazards in the inspection process.
The explosion control range is based on the fact that the explosion-proof weighing sensor shell and instrument are made of explosion-proof materials with special process, which can prevent the explosion inside the shell from spreading and avoid the danger caused by explosion outside the shell, and can effectively control the explosion range. The technology is used to control the ignition source, and the intrinsically safe explosion-proof method is used according to the standard to ensure that there is no danger at the site. The application of explosion-proof sensors, to a certain extent, ensures the staff and reduces the incidence of accidents.
When using explosion-proof load cells, it should be noted that the explosion-proof transmitter must strictly comply with the explosion-proof regulations during installation, and impact and vibration should be avoided during installation. If it is installed under freezing conditions, antifreeze measures should be taken for the explosion-proof sensor, and the sensor should be prevented from contacting with overheated or corrosive media. In order to ensure that the explosion-proof sensor can work well, Therefore, we should pay more attention during the installation process.
Explosion proof load cells are divided into intrinsically safe type and explosion-proof isolation type. They have fast reaction speed, high performance stability and can be remotely operated. When selecting explosion-proof sensors, we should select different types of sensors according to the use occasions and requirements.
2： The concept of explosion
Explosion refers to the sudden change of a substance from one state to another through physical or chemical changes, and the release of huge energy. The energy released by the rapid speed will cause the surrounding objects to suffer violent impact and destruction;
3： Three conditions must be met for explosion:
Explosive substances: substances that can react with oxygen (air), including gases, liquids and solids. (Gas: hydrogen, acetylene, methane, etc.; liquid: alcohol, gasoline; solid: dust, fiber dust, etc.)
Ignition source: including open flame, electrical spark, mechanical spark, electrostatic spark, high temperature, chemical reaction, light energy, etc.
4： Why Explosion Proof
Explosive substances: some combustible substances are produced in many production sites. Explosive substances exist in about two-thirds of the underground coal mines; In the chemical industry, more than 80% of the production workshop areas contain explosive substances. Oxygen: Oxygen in the air is everywhere. Ignition source: a large number of electrical instruments are used in the production process. All kinds of friction sparks, mechanical wear sparks, electrostatic sparks, high temperatures, etc. are unavoidable, especially when the instruments and electrical failures occur.
Objectively, many industrial sites meet explosion conditions. When the mixed concentration of explosive substances and oxygen is within the explosion limit, if there is an explosion source, the main explosion will occur. Therefore, it is necessary to adopt explosion-proof measures.
5： Explosion proof principle of explosion-proof load cell instrument
Hazard classification of hazardous places:
Zone: Div.1 gas (CLASS I) is a place where explosive gas mixture exists continuously or for a long time under normal conditions;
Zone: Zone 1 where explosive gas mixture may occur under normal conditions;
Zone: Div.2 is a place where explosive gas mixture is unlikely to occur under normal conditions, but only occasionally or for a short time under abnormal conditions;
Zone Div.1: under normal conditions, the mixture of explosive dust or combustible fiber and air may be continuous, frequent for a short time or exist for a long time;
Zone Div, 2: under normal conditions, explosive dust or mixture of combustible fiber and air cannot appear, but only under abnormal conditions, occasionally or for a short time.