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technical article
Explosion-proof thermocouple principle
2012-1-27 19:17:25

WR series explosion-proof thermocouple

1. Overview

Industrial explosion-proof or intrinsically safe thermocouple is a kind of temperature sensor, which is widely used in the chemical industry automatic control system. Through the temperature sensor, the temperature parameter of the control object can be converted into an electrical signal and transmitted to the display and record.

And adjustment instruments, to implement detection, adjustment and control of the system.

In chemical plants, the production site is often accompanied by a variety of flammable, explosive and other chemical gases and steam. If ordinary thermocouples are used, it is very unsafe and can easily cause environmental gas explosion. Therefore, explosion-proof or intrinsic safety must be used in these occasions.

Type thermocouples are used as temperature sensors. Explosion-proof or intrinsically safe thermocouples produced by our factory are suitable for use in places where dⅡBT4 ~ dⅡCT6, ibⅡBT4, iaⅡBT4, and iaⅡCT6 temperature groups are dangerous for explosive gases.

There are currently two types of industrial diaphragm thermocouples produced in this field: nickel-chromium-nickel-silicon (K-type) and nickel-chromium-copper-nickel (E-type).

2.Principle structure

The structure and principle of explosion-proof or intrinsically safe thermocouples and assembled thermocouples are basically the same, the difference is that the explosion-proof or intrinsically safe product junction box (shell) is designed with a special explosion-proof structure. The junction box is die-cast with high-strength aluminum alloy.

It has sufficient internal space, wall thickness and mechanical strength, and the thermal stability of the rubber seal ring meets national explosion-proof standards. Therefore, when the explosive mixed gas inside the junction box explodes, its internal pressure will not destroy

The junction box, and the resulting thermal energy cannot be diffused outward-explosion.

Because the product adopts the special explosion-proof structure described above, the product is fully in line with the explosion-proof categories of dⅡBT4 ~ dⅡCT6, ibⅡBT4, iaⅡBT4, and iaⅡCT6. As long as the user strictly observes the product use rules, the product

A reliable explosion-proof effect can be achieved.

3.Explosion-proof type and grade group

Explosion-proof group: dⅡBT4 or dⅡCT4 dⅡBT6 or dⅡCT6

Intrinsically safe group: iaⅡBT4 or iaⅡCT4 (multi-pair)

iaⅡBT6 or iaⅡCT6 (multi-pair)

Enclosure protection class: IP65


是一种温度传感器,在化学工业自控系统中应用极广,通过温度传感器防爆型热电偶可将控制对象的温度参数变成电信号传递给显示仪、记录仪和调 Explosion-proof thermocouple is a kind of temperature sensor. It is widely used in the chemical industry automatic control system. Through the temperature sensor, the explosion-proof thermocouple can change the temperature parameter of the control object into an electrical signal and transmit it to the display, recorder and adjuster.

Metronome, to detect, adjust and control the system.

In chemical plants, production sites are often accompanied by a variety of flammable, explosive and other chemical gases. If ordinary thermocouples are used, it is very unsafe and can easily cause environmental gas explosions. Therefore, explosion-proof thermocouples must be used as

Degree measuring instruments, our company's explosion-proof thermocouple products are suitable for use in places with explosive gas danger in the EXdⅡCT6 temperature group.


Features:
Designed according to the latest explosion-proof regulations GB3836 in compliance with international IEC standards;


Adopt two-chamber flameproof structure, easy to replace temperature measuring element, safe and reliable to use


Explosion-proof mark EXdⅡCT6, suitable for temperature measurement below IIC, ignition temperature above T6, and explosive gas-containing occasions.

利用间隙隔爆原理,设计具有足够强度的接线盒等部件,将所有会产生火花、电弧和危险温度的零部件都密封在接线盒腔内,当腔内发生爆炸时,能通过 Explosion-proof thermocouples use the gap-proof principle to design junction boxes and other components with sufficient strength. All components that produce sparks, arcs, and dangerous temperatures are sealed in the junction box cavity. When an explosion occurs in the cavity, it can pass through.

The gap between the joints is extinguished and cooled, so that the flame and temperature after the explosion can not be transmitted outside the cavity for measurement.