WRNK2-440 Explosion proof Thermocouple Shanghai Ziyi Third Factory

WRNK2-440 Explosion proof Thermocouple Shanghai Ziyi Third Factory

In chemical plants, various flammable and explosive chemical gases and vapors are often present on the production site. Using ordinary thermocouples is very unsafe and can easily cause environmental gas explosions. Therefore, in these situations, explosion-proof or intrinsically safe thermocouples must be used as temperature sensors. The explosion-proof or intrinsically safe thermocouple products produced by our factory are suitable for use in places with explosive gas hazards within the temperature group range of dIIBT4 to dIICT6, ibIIBT4, iaIIBT4, and iaIICT6.

The technical performance of the explosion-proof or intrinsic safety thermocouples produced by our factory complies with JB/T9238-1999 Technical Conditions for Industrial Thermocouples GB/T16839-1997, GB/T16839.2-1997 Industrial Thermocouple Index Table and allowable errors. At the same time, all products meet the general requirements for explosion-proof electrical equipment used in explosive environments GB3836.1-2000 and GB3836.2-2000 standards. The explosion-proof safety supervision and inspection station of instruments and meters specially approves and approves the product drawings, technical documents, and prototypes, and issues explosion-proof certificates.

At present, our factory produces two types of industrial explosion-proof thermocouples: nickel chromium nickel silicon (K-type) and nickel chromium copper nickel (E-type).

Intrinsic safety thermocouples must use intrinsic safety compensation wires, with a controlled range of distributed parameters: total inductance ≤ 2mH, capacitance ≤ 0.06, and the use of associated equipment safety barriers. The selection of associated equipment should follow the following principles. When thermocouples (must be insulated) are equipped with low internal resistance secondary instruments, MTL760/ac, Z960/ac, LB960/ac safety barriers should be selected. The specific wiring of the safety barriers can be found in the manufacturer's instructions.

Product Technical Data

Range specifications

Note:'t 'refers to the measured temperature of the temperature sensing element,

Thermal response time

When there is a step change in temperature, the time required for the output of the thermocouple to change to 50% of the step change is called the thermal response time, represented by T0.5.

Nominal pressure

Generally refers to the static external pressure that the protective tube can withstand at room temperature without breaking, and the test pressure is generally 1.5 times the nominal pressure. 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, as well as the flow rate and type of the measured medium.

Thermocouple insulation resistance:

The test voltage for insulation resistance at room temperature is DC 500 ± 50V.

The atmospheric conditions for measuring insulation resistance at room temperature are: temperature 15~35℃The relative humidity is 45% and the atmospheric pressure is 86~106kPa.

For thermocouples with a length greater than 1 meter, the product of the insulation resistance value at room temperature and its length should not be less than 100 M Ω M is: Rr · L>100 M Ω· m L>1m, where: Rr - the insulation resistance value of the thermocouple at room temperature, M Ω; L - the length of the thermocouple, m

For thermocouples with a length ≤ 1 meter, the insulation resistance value at room temperature should not be less than 100 M Ω

Insulation resistance of armored thermocouple (insulated type):

At an ambient temperature of 20 ± 15℃When the relative humidity is not greater than 80%, the insulation resistance between the thermoelectric electrode and the outer sleeve should be greater than or equal to 100 M Ω· M *, and the test voltage is 500V DC（※The insulation resistance is expressed in M Ω· M, which is the product of the insulation resistance at room temperature and the length of the armored thermocouple

Explosion proof type and level group

Explosion proof level group: dⅡBT4Or dⅡCT4 dⅡBT6Or dⅡCT6

Intrinsic safety group: iaⅡBT4Or iaⅡCT4(Multiple pairs)

iaⅡBT6Or iaⅡCT6(Multiple pairs)

Shell protection level IP65

Principle structure:The structure and principle of explosion-proof or intrinsic safety thermocouples are basically the same as those of prefabricated thermocouples. The difference is that the explosion-proof or intrinsic safety 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 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 mixture gas inside the junction box explodes, its internal pressure will not damage the junction box, and the resulting heat energy cannot diffuse outward for explosion transmission.

Due to the use of the above-mentioned explosion-proof special structure, the product * is suitable for use in dⅡBT4To dⅡCT6、 Within the explosion-proof categories of ibIIBT4, iaIIBT4, and iaIICT6, as long as users follow the product usage rules, the product can achieve reliable explosion-proof effects.

Explosion proof mark, category, level, and temperature group: Explosion proof mark representation method for explosion-proof and intrinsic safety thermocouples

Description of temperature groups for categories and levels of electrical equipment:

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

IIClass - Factory Electrical Equipment

Explosion proof level: Explosion proof and intrinsic safety thermocouples are suitable for explosive gas mixtures with maximum safety clearance or minimum ignition current ratios of A, B, C, and III.

Temperature group: The temperature group of explosion-proof and intrinsic safety thermocouples is divided into T1 according to the highest surface temperature of their exposed partsT6 six groups.

WRNK2-440 Explosion proof Thermocouple Shanghai Ziyi Third FactoryProduct selection information