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Armored thermocouple





Overview

    

Armored thermocouples offer many advantages such as bendability, high pressure resistance, fast thermal response time and ruggedness. They are used as temperature-measuring transmitters, as well as display instruments, recording instruments and electronic adjustments, just like industrial fabricated thermocouples. It can be used as a temperature sensor for assembled thermocouples. It can directly measure the temperature of liquid, vapor and gaseous media and solid surfaces from 0 to 800 °C in the production process.

principle


 The working principle of the armored thermocouple is that the two ends of the conductors of different components are welded to form a loop, the direct temperature measuring end is called the working end, and the terminal end is called the cold end, also called the reference end. When there is a temperature difference between the working end and the reference end, a thermal current is generated in the circuit, and the display meter is connected, and the corresponding temperature value of the thermoelectromotive force generated by the thermocouple is indicated on the meter.
    The thermoelectromotive force of the armored thermocouple will increase with the temperature of the measuring end. The magnitude of the thermoelectromotive force is only related to the thermocouple conductor material and the temperature difference between the two ends, and has nothing to do with the length and diameter of the hot electrode.
   The structural principle of the armored thermocouple is that it is made of conductor, high-insulation magnesia, and jacket 1Cr18Ni9Ti stainless steel protection tube. Armored thermocouple products are mainly composed of junction boxes, terminal blocks and armored thermocouples, and are equipped with various mounting fixtures.

Armored thermocouples are available in both insulated and shelled versions.

Basic technical indicators

category
(code number)

Graduation 

Outer diameter of casing( d)

Common temperature(℃)

Maximum operating temperature(℃)

Allowable deviation△ t

Measuring range(℃)

Allowable margin

Nickel-chromium-constantan 
WREK

E

≥φ 3

600

700

0~700

± 2.5℃or
± 0.75%t
Nickel Chromium-Nickel Silicon
WRNK

K

≥φ 3

800

950

0~900

± 2.5℃or
± 0.75%t
Copper-Kang Copper
WRCK

T

≥φ 3

350

400

<-200

No provision

-40~350

± 1℃或
± 0.75%t

Note: 1, t is the absolute value of the measured temperature

    2, T-type index number products need to negotiate with the factory to order

Armored thermocouple thermal response time

 In the case of a step change in temperature, the time at which the output of the thermocouple changes to 50% of the step change is called the thermal response time, expressed as τ0.5.

Insulation resistance

When the ambient air temperature is 20±1.5°C and the relative humidity is not more than 80%, the insulation resistance between the wire and the outer casing of the insulated armored thermocouple shall comply with the following table.

Even wire diameter

( mm)

Test voltage

( V-DC)

Insulation resistance

( MΩ.m )

1.5

50±10%

≥ 1000

>1.5

500±10%

≥ 1000

Flexibility

    The flexible radius of the armored thermocouple is not less than 5 times its outer diameter.

Armored thermocouple thermal response time

Thermal response time τ 0.5 second casing diameter

(mm)

Shell type

Insulated

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

Armored thermocouple outer diameter and nominal length standard specifications

Armored thermocouple outer diameter d

d(mm)

φ 8

φ 6

φ 5

φ 4

φ 3

50

50

50

50

50

75

75

75

75

75

100

100

100

100

100

150

150

150

150

150

200

200

200

200

200

250

250

250

250

250

300

300

300

300

300

400

400

400

400

400

500

500

500

500

500

750

750

750

750

750

1000

1000

1000

1000

1000


1250

1250

1250

1250


1500

1500

1500

1500


2000

2000

2000

2000



2500

2500

2500



3000

3000

3000



4000

4000

4000




5000

5000




7500

7500




10000

10000





15000

Note: 1. The nominal total length L of the ?3 insulated armored thermocouple shall not exceed 10000mm.

    2, armored thermocouple outer diameter d ≤ ? 5mm, and has a splash-proof or waterproof junction box products, users should pay attention to the installation, the thermocouple exposed equipment must be equipped with brackets and other auxiliary support, increase stiffness, ensure Sturdy to prevent the junction box from shaking back and forth, damaging the thermocouple.


structure

Structural form of armored thermocouple material

Working end (hot end) structure

Mounting form

    

The fixture is for user installation. In addition to the non-fixed device products, the armored thermocouple fixing device has four types: fixed ferrule type, movable ferrule type, fixed flange and movable flange. The fixed ferrule type is fixed for the user, and the movable ferrule type user can be fixed multiple times.

Armored thermocouple outer diameterd

Casing diamete

(mm)

φ 8

φ 6

φ 5

φ 4

φ 4

φ 3

φ 2

M

M16*1.5

M12*1.5

S

22

19

Note: The number in the brackets is generally not used. If you need to order special specifications.

Armored thermocouple free end (junction box) form

   The junction box is used to connect the free end of the thermocouple and the display instrument. At present, there are various structures such as simple type, splash proof, waterproof type, handle type, small junction box type and compensation conductor type.

  With compensation wire
  Splash proof
  Waterproof
  Handle type
  Small junction box





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