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WRE Series Explosion-proof Type Thermocouple

WRE Series Explosion-proof Type Thermocouple

WRE series explosion-proof type thermocouple is a temperature sensor. It is widely used in automatic control system of Chemical industry. Through temperature sensor,it can transform the temperature parameters of the control object...

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Product Details

WRE series explosion-proof type thermocouple

 

Product introduction

WRE series explosion-proof type thermocouple is a temperature sensor. It is widely used in automatic control system of Chemical industry. Through temperature sensor,it can transform the temperature parameters of the control object to  electric signals, then delivery them to display instrument ,recorder, regulator, and carry out detection ,control and adjustment to the system. In chemical factories, there are always many flammable and explosive chemical gas, steam, hydrocarbon etc. in production field. It is very dangerous to use normal thermocouple, and will cause explosion of environment gas easily. So, we must use explosive-proof or intrinsic safety type thermocouple as temperature sensor in these places. Besides, it has Multiple explosive-proof types, good explosion-proof performance, compression spring type thermal components, good anti-vibration performance, high mechanical strength and good pressure-resistant properties.

 

Working principle

Explosive-proof or intrinsic safety type thermocouple has similar structure and principle with fabricated thermocouple. The difference is that explosive-proof or intrinsic safety type thermocouple’s junction box(shell) is designed to use explosion-proof special structure and is cast by high-strength aluminum alloy. It has enough inside space, wall thickness and mechanical strength, and the heat stability of its rubber sealing ring satisfy the national anti-explosion standard. So, when the explosive gas mixture inside junction box  happen explosion accident, its internal pressure won’t destroy junction box, and the resulting heat energy can not spread beyond booster.

 

Main Technical Parameters

Range specifications

Type

Degree

Temperature Range℃

Accuracy Class

Allowable Deviation △t ℃

WRE
WRE2

E

0~600

I

±1.5℃/±0.004%∣t∣

±2.5℃/±0.75%∣t∣

Note: “t” is absolute value of measured temperature of temperature-sensing element.

 

Thermal response time

When temperature is under the step change, the input of thermocouplel changes to the time that 50% of the step change cost. It is called thermal response time, which is represented by T0.5.

 

Nominal Pressure

Generally refers to the room temperature, protective tube will not crack under static pressure. Test pressure usually use 1.5 times of nominal pressure. Actually, Allowance nominal pressure is not only related to material Of protecting tube, diameter and wall thickness, but also related to its structural style, installation method, placed-depth and the types, flow rate of measured medium.

 

Thermocouple insulation resistance

The test voltage of the normal temperature insulation resistance: 500±50V DC.

The atmospheric conditions to measure the normal temperature insulation resistance: 15~35℃, relative humidity 45%,  atmospheric pressure 86~106kPa.

 For thermocouple whose length>1m, the product of the normal temperature insulation resistance value and its length should not be less than 100 MΩ.M. That is to say Rr·L>100 MΩ·m L>1m.In the formula: Rr- value of thermocouple’s normal temperature insulation resistance, MΩ;L- length of thermocouple, m. For thermocouple whose length≤1m, the normal temperature insulation resistance value should not be less than 100 MΩ.

 

Explosion-proof type and level group


Explosion-proof level group: dⅡBT4/dⅡCT4  dⅡBT6/dⅡCT6

Intrinsic safety level group:

iaⅡBT4/iaⅡCT4(multiplex type)

iaⅡBT6/iaⅡCT6(multiplex type)

Enclosure protection class: IP65


Principle structure

Explosive-proof or intrinsic safety type thermocouple has similar structure and principle with fabricated thermocouple. The difference is that explosive-proof or intrinsic safety type thermocouple’s junction box(shell) is designed to use explosion-proof special structure and is cast by high-strength aluminum alloy. It has enough inside space, wall thickness and mechanical strength, and the heat stability of its rubber sealing ring satisfy the national anti-explosion standard. So, when the explosive gas mixture inside junction box  happen explosion accident, its internal pressure won’t destroy junction box, and the resulting heat energy can not spread beyond booster.

For our products use above Explosive-proof special structure, they completely suitable to use in the range of dⅡBT4 to dⅡCT6、ibIIBT4、iaIIBT4、iaIICT6 explosion-proof category. As long as users follow the products use rules, products can achieve reliable explosion-proof effect.

 

Model

W

R

Spec

Content

 

 

M

NiCrSi-NiCr

N

NiCr-NiSi

E

NiCr-CuNi

C

Cu-CuNi

F

Iron-CuNi

 

Code

Couples of thermal wires

None

Single branch

2

Dual-branch

 

Code

Fixed installation type

1

No fixed device

2

Fixed thread

4

Fixed flange

5

Loose coupling type

6

Fixed thread tapper tube type

Code

Junction box type

4

Flame-proof type

 

Code

Protection tube diameter

0

16mm

 

Code

Working side form

K

Armoured filling


If the wre series explosion-proof type thermocouple for sale caters to your requirement, welcome to buy with us. As one of the leading such manufacturers and suppliers in China, we will offer you cheap price and excellent services.
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