Working principle

The structure and principle of explosion-proof thermocouples are basically the same as those of prefabricated thermocouples. The difference is that the explosion-proof product junction box (housing) adopts a special explosion-proof structure in the design. The junction box is made of high-strength aluminum alloy die-casting, and the well has sufficient internal space, wall thickness, and mechanical strength. The thermal stability of the rubber sealing ring meets the national explosion-proof standards. So, when the explosive mixed gas inside the junction box explodes, its internal pressure will not damage the junction box, and the resulting heat energy cannot spread or explode outward.
Due to the use of the above-mentioned explosion-proof special structure, the product fully complies with the explosion-proof temperature range of dIIBT4 or dIICT6. As long as users strictly follow the product usage rules, the product can achieve reliable explosion-proof effect.

Main technical indicators

Temperature measurement range and allowable error

Note: "t" represents the absolute value of the measured temperature of the temperature sensing element, and the dual platinum resistance is only supplied to Class B.
Grade A is a special order

nominal pressure

Generally refers to the static external pressure that the protective tube can withstand at room temperature without breaking, and the test pressure gauge generally uses 1 In fact, the allowable working pressure is not only related to the material, diameter, and wall thickness of the protective tube, but also to its structural form, installation method, insertion depth, and the flow rate and type of the measured medium.

Thermal resistance insulation resistance

The test voltage for insulation resistance at room temperature can take any value from 10 to 100V DC, and the ambient temperature should be within the range of 15 to 35 ℃, with a relative temperature not exceeding 80%. The insulation resistance value at room temperature should not be less than 100M Ω.

Thermal resistance allows current to pass through

The maximum current measured through a platinum resistor shall not exceed 5mA

Explosion proof type and level group

Explosion proof level group: d II BT4 or d II CT4
D II BT6 or d II CT6
Shell protection level: IP54

Explosion proof Marking Method for Explosion proof Thermistors

Description of categories, levels, and temperature groups of electrical equipment

Electrical equipment is divided into two categories: Category I - Electrical equipment used underground in coal mines
Class II - Factory Electrical Equipment

Explosion proof grade

The explosion-proof level of explosion-proof thermocouples is divided into three levels: A, B, and C, based on the maximum safe gap or minimum ignition current ratio applicable to explosive gas mixtures.

Temperature group

The temperature groups of explosion-proof thermocouples are divided into six groups, T1 to T6, according to the highest surface temperature of their exposed parts.

Enterprise Honor and Qualification

On site map of equipment factory

Customers use on-site maps

Buyers must-read

Shipping Notice