Explosion-proof pressure transmitter principle

Time: 2024-10-17
Equipment Configuration:Explosion-proof pressure transmitter

An explosion-proof pressure transmitter is an instrument used to measure pressure in hazardous areas (areas where flammable and explosive gases or dust exist).

Project Overview

An explosion-proof pressure transmitter is an instrument used to measure pressure in hazardous areas (areas where flammable and explosive gases or dust exist). It is designed to meet strict safety standards to prevent internal spark or explosion accidents. The basic principle of an explosion-proof pressure transmitter is to enclose the pressure-sensitive element in a solid metal shell, which is called an "explosion-proof shell".

Working Principle

The working principle of the explosion-proof pressure transmitter is based on the principle of Faraday cage. A Faraday cage is a conductive enclosure that protects the interior space from external electric fields and electromagnetic interference. Flameproof enclosures follow the same principle, creating a safe area for pressure-sensitive components that is isolated from a potentially explosive atmosphere.

When pressure is added to the flameproof shell, the pressure sensitive element will sense the pressure change and generate a corresponding electrical signal. This electrical signal is transmitted to the safe area through an isolation barrier, which is usually implemented using a capacitor, optocoupler, or inductive coupler. Isolation barriers prevent potential sparks or arcs from traveling from safe areas to hazardous areas.

Explosion-proof shell structure

The design of the explosion-proof shell is crucial to ensure the safety and reliability of the explosion-proof pressure transmitter. Flameproof enclosures are usually made of durable metal materials such as stainless steel, aluminum or cast iron. It consists of two main components:

Internal explosion-proof chamber: houses the pressure-sensitive components and isolation barrier. External enclosure: Provides external protection and prevents the ingress of gases or dust.

A precise gap is maintained between the inner explosion-proof chamber and the outer shell, called the "explosion-proof gap". Explosion-proof gaps are designed to limit the spread of sparks or flames in the event of an explosion, thus preventing external explosions.

Isolation barrier

The isolation barrier plays a vital role in explosion-proof pressure transmitters because it separates the pressure-sensitive components from the safe area. There are three main types of isolation barriers:

Capacitive barriers: Use capacitors to create capacitive isolation, blocking DC and AC signals. Optocoupler: Use an optocoupler to achieve electrical and optical isolation, allowing electrical signals to pass but preventing sparks or arcs. Inductive Coupler: Inductive coupling using a transformer to transmit electrical signals between primary and secondary coils.

Standards

Explosionproof pressure transmitters must meet strict standards to ensure their safety and reliability in hazardous areas. Different organizations or regions have different institutions, for example:

United States: Underwriters Laboratories (UL) Europe: European Committee for Standardization (CEN) International: International Electrotechnical Commission (IEC)

Standards specify requirements for specific equipment types for use in hazardous areas, including flameproof enclosure design, isolation barrier types and testing procedures.

Applications

Explosionproof pressure transmitters are used in a variety of hazardous areas, including:

Oil and natural gas industry Chemical plants Pharmaceutical industry Mining industry Food processing industry

Explosionproof pressure transmitters are used to monitor pipelines, vessels and process equipment.The pressure inside the equipment ensures safe operation and prevents explosion accidents.

Choose an explosion-proof pressure transmitter

When choosing an explosion-proof pressure transmitter, the following factors should be considered:

Pressure range and accuracy requirements of the process medium Compatibility Type and Class of Hazardous Areas Standard Environmental Conditions (Temperature, Humidity, Vibration) Output Signal Type (Analog, Digital)

Correct explosion-proof pressure transmitter selection is essential for safe and reliable operation in hazardous areas. Monitoring stress is critical.

The explosion-proof pressure transmitter is an instrument designed for hazardous areas and provides safe and reliable pressure measurement. Through its strong explosion-proof shell, isolation barrier and strict standards, explosion-proof pressure transmitter effectively prevents spark or explosion accidents and ensures the safety of personnel and equipment.

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