Product introduction:

A summary, armoured thermocouple

Armored thermocouple can bend, resistance to high pressure, fast thermal response time and durable, it and industrial assembly-type thermocouple, as a measurement of the temperature sensor, usually and display instruments, recording instruments and electronic components supporting the use of regulator, process control system, but also can be used as temperature sensing element thermocouple assembly the. It can directly measure the production process from 0 ℃ to 1100 ℃ range of liquid, steam and gas and solid medium surface temperature. Compared with the assembly type thermocouple, armoured thermocouple has the advantages of flexible, high pressure resistance, thermal response time is short and sturdy and durable.

Two, armoured thermocouple principle

The working principle of armored thermocouple is composed of two different components of the conductor ends by welding, forming a loop, directly measuring temperature end called measuring terminal, terminal called reference end. When the temperature difference between measuring end and the reference end, will produce the thermal current in the circuit, connected to display instrument, the instrument will indicate the corresponding temperature thermocouple thermoelectric EMFs generated by the value of the. Thermoelectric EMFs of armored thermocouple with the measuring end of the temperature rise, only the size of Thermal EMF and armoured thermocouple conductor material and the temperature difference between the two ends, and the thermode length, diameter. Armored thermocouple structure is composed of conductors, insulating magnesium oxide and 1Cr18Ni9Ti stainless steel protection tube after several control and become, armoured thermocouple products is mainly composed of a junction box, terminal and sheathed thermocouple components of the basic structure, and with various mounting and fixing device. Armoured thermocouple type insulation shell and then two.

Three, characteristics of sheathed thermocouple

Response time of less heat, reduce the dynamic error;

Flexible installation;

Large measuring range;

High mechanical strength, good pressure resistance;

Four, the main technical parameters

The implementation of product standards

IEC584

IEC1515

GB/T16839-1997

JB/T5582-91

○ armoured thermocouple measurement range and tolerance

The allowable deviation of category index number code casing size mm commonly used temperature maximum use temperature

The measuring range ℃ allowed value

Platinum rhodium 10- platinum WRPK S ≥ 313001600 0-1600 ± 1.5 ℃ or ± 1.5%t

Nickel - chromium WREK E ≥ 3600700 0-700 ± 2.5 ℃ or ± 0.75%t

Ni-Cr WRNK K ≥ 39001100 0-1100 ± 2.5 ℃ or ± 0.75%t

Copper copper - nickel WRCK T ≥ 3350400 less than -200 is not specified

-40-350 + 0.75%t

Iron copper - nickel WRFK J ≥ 3600750 0-750 ± 2.5 ℃ or ± 0.75%t

Note: "t" as the absolute value of the measured temperature.

At room temperature, insulation resistance

Sheathed thermocouple at an ambient temperature of 20 ± 15 ℃, relative humidity of not more than 80%, the test voltage is 500 ± 50V (DC) ≥ 1000M Ω.M insulation resistance between electrode and outer tube. The specimens of 1m long insulation resistance is 1000M Ω; insulation resistance 10m long specimens of 100M.

Casing diameter mm test voltage V-DC insulation resistance M Ω· M

0.5~1.5 50 ± 5 ≥ 1000

> 1.5 500+50 diameter ≥ 1000

Time response, armoured thermocouple

In the temperature step change, the output variation of the thermocouple to equivalent to the step change of the 50% and the time that needs is thermal response time, represented by τ 0.5

Time is not more than the provisions of the following table response armoured thermocouple:

Thermal response time of 0.5S shell type insulated type

Casing diameter (mm)

2 0.4 0.5

3 0.6 1.2

4 0.8 2.5

5 1.2 4

6 2 6

8 4 8

○ armoured thermocouple wire diameter and material

Filament form

Single type

Double branch type

The diameter of the casing

2 3 4 5 6 8

3 4 5 6 8

Casing material

E, J, T

1Cr18Ni9Ti

1Cr18Ni9Ti

K, N

1Cr18Ni9Ti GH3030

1Cr18Ni9Ti GH3030

S

GH3039

GH3039

The outer diameter and nominal length, Standard Specification for

Armoured thermocouple diameter D (mm)

Phi 8

Phi 6

Phi 5

Phi 4

Phi 3

Phi 2

50

50

50

50

50

50

75

75

75

75

75

75

100

100

100

100

100

100

150

150

150

150

150

150

200

200

200

200

200

200

250

250

250

250

250

250

300

300

300

300

300

300

400

400

400

400

400

400

500

500

500

500

500

500

750

750

750

750

750

750

1000

1000

1000

1000

1000

1000

1250

1250

1250

1250

1250

1500

1500

1500

1500

1500

2000

2000

2000

2000

2000

2500

2500

2500

2500

3000

3000

3000

3000

4000

4000

4000

5000

5000

10000

○ armoured thermocouple structure

Armoured thermocouple and armored thermal resistance material is composed of thermal electrode (wire) magnesium oxide insulating material and 1Cr18Ni9Ti stainless steel pipe by repeatedly drawing forming.

Measurement of armored thermocouple end type insulation shell and then two.

1) sheathed thermocouple material structure

2) the measuring end structure

○ armoured thermocouple fixed form

1, the card sets threaded joint

Armoured thermocouple diameter D

8

6

5

4

4

3

2

Fixing device designation and dimensions

M

The M16 ´ 1.5

The M12 ´ 1.5

S

22

19

Note: figures in brackets in the specifications are generally not used, such as the need for special specification order.

2, the card sets flange

Armoured thermocouple diameter D

8

6

5

4

4

3

2

Fixing device designation and dimensions

D

Phi 60

Phi 50

D0

Phi 42

Phi 36

D1

Phi 24

Phi 20

S