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K-type thermocouple main features
Dec 28, 2017

K-type thermocouple main features


Detection (temperature) components Thermocouple is the industry's most commonly used one of the 

temperature detection device. Must be equipped with secondary instrument, the advantages are:

① high measurement accuracy. Because the thermocouple directly with the measured object contact,

 not subject to the impact of intermediate media.

② measuring a wide range. Commonly used thermocouple from -50 ~ + 1600 ℃ can be continuous

 measurement, some special thermocouple can be measured to a minimum of -269 ℃ (such as gold and 

iron nickel-chromium), up to +2800 ℃ (such as tungsten - rhenium).

③ simple structure, easy to use. Thermocouple is usually composed of two different metal wire,

 and not subject to the size and the beginning of the restrictions, the outer protective sleeve,

 with very convenient.

2 according to the temperature measurement range and accuracy, select the appropriate number of thermocouples

The use of temperature 1300 ~ 1800 ℃, the required accuracy and relatively high, the general selection of B-type thermocouple; required accuracy is not high, the atmosphere allows the use of tungsten rhenium thermocouple, tungsten rhenium thermocouple is generally higher than 1800 ℃; 1000 ~ 1300 ℃ required accuracy and relatively high available S-type thermocouple and N-type thermocouple; generally below 1000 ℃ with K-type thermocouple and N-type thermocouple, generally lower than 400 ℃ with E-type thermocouple; 250 ℃ And negative temperature measurement is generally used with T-type galvanic couple at low temperature when the T-type thermocouple stability and high accuracy.

Measuring range and allowable error range

Measuring range and allowable error range

Thermocouple category


Division number

Measuring range

Basic error limits

Nickel chromium - constantan





Nickel chromium - nickel silicon





Note: t for the temperature sensing element temperature (℃) the higher the electric field strength, and thus the greater the contact potential. So that the thermoelectric power generated by 1 is displayed on the display meter 3 through the connecting lead 2. In this case,

The Time Constant

Thermal inertness level

Time constant (seconds)

Thermal inertness level

Time constant (seconds)





Thermocouple nominal pressure: generally refers to the working temperature of the protection tube can withstand static external pressure and rupture.

Thermocouple minimum insertion depth: should not be less than 8-10 times the outer diameter of its protective casing (special column product exception)

Insulation resistance: When the ambient air temperature is 15-35 ℃, relative humidity <80% when the insulation resistance ≥ 5 megohms (voltage 100V). With a splash-proof junction box thermocouple, when the relative temperature of 93 ± 3 ℃, the insulation resistance ≥ 0.5 megohms (voltage 100V)

High temperature insulation resistance: K-type

HD thermocouple pictures

HD thermocouple pictures

The insulation resistance (in meters per meter) between the thermocouple (including the double support) and the protective tube and the double support thermocouple shall be greater than the values specified in the table below at high temperatures.

The specified long-term use temperature(℃)

Test temperature(℃)

Insulation resistance value(Ω)




≥ 800






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