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Fabricated thermocouple

 

Overview
Industrial thermocouple assembly as a temperature sensor, usually, and display instruments, recording instruments and supporting the use of electronic regulator. Thermocouple assembly can be directly measured from a variety of production range of 0 ¡æ to 1800 ¡æ of liquid vapor, gas and solid surface temperature¡£
According to state regulations, the production company dividing line with international standards IEC platinum and rhodium No. 30 - 6 platinum and rhodium, platinum and rhodium 10 - platinum, nickel, chromium - nickel silicon, nickel, chromium - constantan thermocouple assembly, etc.¡£
Assembly thermocouple temperature sensing element is usually to install fixtures and junction boxes and other major parts¡£

Measuring range and allowable error range

Thermocouple types
Code
Dividing number
Measuring range
Basic error limit
Nickel chrome£­Constantan
WRK
E
0£­800¡æ
¡À0.75%t
Nickel chrome£­Ni Si
WRN
K
0£­1300¡æ
¡À0.75%t
Platinum and rhodium 13 -Platinum
WRB
R
0-1600¡æ
¡À0.25%t
Platinum and rhodium 10 £­Platinum
WRP
S
0£­1600¡æ
¡À0.25%t
Platinum and rhodium 30 £­Platinum and rhodium 6
WRR
B
0£­1800¡æ
¡À0.25%t
Note: t is the measured temperature sensing element temperature (¡æ£©

Thermocouple time constant
Level of thermal inertia
Time constant (seconds£©
Time constant
Time constant (seconds£©

¢ñ

90£­180

¢ó

10£­30

¢ò

30£­90

¢ô

£¼10
Thermocouple Pressure: generally refers to the working temperature protection tube can withstand external pressure and the rupture of the static¡£
Thermocouple minimum insertion depth: the protective casing should be not less than 8-10 times the diameter (special exceptions listed products£©
Insulation resistance: When the ambient air temperature is 15-35 ¡æ, relative humidity "80%, ¡Ý 5 megohms insulation resistance (voltage 100V). Junction box with a splash-type thermocouple, when the relative temperature of 93 ¡À 3 ¡æ, the insulation resistance of ¡Ý 0.5 Mohm (voltage 100V£©
Insulation resistance under high temperature: thermocouples at high temperatures, the hot electrode (including double-vessel type) and the protection tube and double-vessel thermal insulation resistance between the electrodes (per meters) should be greater than the value specified in the following table¡£

Prolonged use of prescribed temperature£¨¡æ£©

Test temperature£¨¡æ£©

Insulation resistance£¨¦¸£©

¡Ý600
600
72000
¡Ý 800
800
25000
¡Ý1000
1000
5000
 
 
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Temperature Instrumentation Division     Pressure Instrumentation Division         Calibration instruments Division
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