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K-type thermocouple

 

Outline
The industrial used assembly type K thermo-element takes one kind of temperature sensor, the K thermo-element is usual and display instrument, recording meter and electronic regulator necessary use. The assembly type K thermo-element may in direct measurement each kind of production from 0¡æ to 1300¡æ the scope liquid steam and the gas medium as well as the solid surface temperature.
Stipulated according to the country that Our company produces conforms to the IEC international standard indexing number platinum rhodium 30- platinum rhodium 6, platinum rhodium 10- platinum, the nichrome - nickel silicon, the nichrome - constantan and so on assembly type thermo-element.
Assembles the K thermo-element usually by the bulb, the installment attachment system and the connecting box and so on major component is composed.

Measuring range and allowance error scope
Thermo-element category
Code number
Indexing number
Measuring range
Basic limit of error
Nichrome - constantan
WRK
E
0-800¡æ
¡À0.75%t
Nichrome - nickel silicon
WRN
K
0-1300¡æ
¡À0.75%t
Platinum rhodium 13 - platinum
WRB
R
0-1600¡æ
¡À0.25%t
Platinum rhodium 10 - platinum
WRP
S
0-1600¡æ
¡À0.25%t
Platinum rhodium 30 - platinum rhodiums 6
WRR
B
0-1800¡æ
¡À0.25%t
Note: t is the bulb actual temperature value (¡æ)

Thermo-element time-constant
Thermal inertia rank
Time-constant (second)
Thermal inertia rank
Time-constant (second)

¢ñ

90-180

¢ó

10-30

¢ò

30-90

¢ô

<10
Thermo-element nominal pressure: Generally is refers to the static external pressure which the tube protector can withstand under the operating temperature to burst.
Thermo-element smallest depth of penetration: Should not be smaller than its splice case outer diameter 8-10 times (arranges in order product exception especially)
Dielectric resistance: When surrounding air temperature for 15-35¡æ, relative humidity <80% dielectric resistance ¡Ý5 megohm (voltage 100V). Has against splashes the type connecting box thermo-element, when relative temperature for 93¡À 3¡æ, dielectric resistance ¡Ý0.5 megohm (voltage 100V)
Under high temperature dielectric resistance: The thermo-element under the high temperature, its hot electrode (according to each meter idea) should be bigger than the next table stipulation (including a pair of type) with between the tube protector as well as the pair of hot electrode's dielectric resistance the value.

Stipulation long time application temperature (¡æ)

Experimental temperature (¡æ)

Insulation resistance value (OMEGA)

¡Ý600
600
72000
>= 800
800
25000
¡Ý1000
1000
5000
 

 

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Temperature Instrumentation Division     Pressure Instrumentation Division         Calibration instruments Division
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