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
