CEPAI GROUP CO.,LTD

Non-fixed Armored Thermocouple WRNK-101,WRNK-121,WRNK-131

WREK series armoured type thermocouple Brief Description WREK series armoured type thermocouple has advantages of being able to bend, high temp resistance, quick thermal response time and being sturdy and durable etc. Like industrial assembly-type thermocouple, as sensor of temp measurement, it...

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WRNK series armoured type thermocouple

Brief Description

WRNK series armoured type thermocouple has advantages of being able to bend, high temp resistance, quick thermal response time and being sturdy and durable etc. Like industrial assembly-type thermocouple, as sensor of temp measurement, it is usually used with display, recorder and electronic regulator. Moreover, it can also be the temp sensor element of assembly-type thermocouple. It can measure temp of liquid, stream, gas and surface of solid range 0℃~1000℃ in all production processes. It is as per GB/T18404-2001 standard.

 

Working principle

Thermocouple working principle: two conductors with different components are welded at both ends to form a loop, measuring temperature directly side is called measurement side, terminal side is called reference side. When the temperature between measurement side and reference side has a difference, it will generate heat in the loop current, then connected to the display instrument, And the instrument indicates the corresponding temperature value of the thermal electromotive force generated by the thermocouple. Thermocouple thermoelectric EMF will grow with the measurement temperature’s growth, The size of the thermal electromotive force is related to the temperature of both ends. It has nothing to do with the length, diameter of the thermode. Armoured thermocouple structure is made of conductor, insulation magnesia and 1Cr18Ni9Ti stainless steel protection tube after many times drawing. Junction box, protective tube, insulated casing, terminals and armoured thermocouple form a basic structure of assembly-type thermocouple, with a variety of installation of fixtures. Armoured thermocouple has two kinds: insulation type and shell connecting type.

Main technical parameter 

Temperature measurement range and tolerance


     Category

Code

Graduation

Outer diameter of well mm

Temperature℃

Max temp℃

Allowed error △t

Measuring range℃

Allowed error value

NiCr-CuNi

WRNK

K

≥Φ3

800

1000

0~1000

±2.5℃/±0.75%t

Note:1)t is the absolute value of measuring temperature.

Thermal response time
When the temperature appear step change, the thermocouple output variation is to the equivalent of 50% of the change, The time required is called the thermal response time “T0.5”

Thermal response time of armoured thermocouple should not be more than requirements of the following table:



     Thermal response time
     T0.5S

Shell connecting type

Insulation type

Well diameter(min)

2.0

0.4

0.5

3.0

0.6

1.2

4.0

0.8

2.5

5.0

1.2

4.0

6.0

2.0

6.0

8.0

4.0

8.0



Insulation resistance
When the ambient temp is 20±15℃, and relative humidity is not more than 80﹪, the insulation resistance value between insulation armoured thermocouple wires and outer tube should be as per the following table.

Well diameter mm

Test voltage V-D.C

Insulation resistance MΩ.m

0.5~1.5

50±5

≥1000

>1.5

500±50

≥1000

Model

W

R

Spec



N

NiCr-NiSi

E

NiCr-CuNi

C

Cu-CuNi

Material of thermometric element

K


Armoured type

-

1

No fixed device

2

Fixed adjustable thread joint

3

Flexible adjustable thread joint

4

Fixed adjustable thread flange

5

Flexible adjustable thread flange

Mounting fixed type

0

No junction box

2

Splash-proof

3

Water-proof

8

Hand lever

8

Little junction box

9

With compensating lead wire

Junction box type

1

Insulation

2

Shell connecting

7

Insulation(Hand lever)

8

Shell connecting(Hand lever)

Working end type

3

3-couples

4

4-couples

5

5-couples

6

6-couples

Multi-couples


W

R

K

-



If the non-fixed armored thermocouple wrnk-101,wrnk-121,wrnk-131 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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