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technical article
Classification and product characteristics
2012-2-11 10:37:59

Overview of assembling thermocouples

作为测量温度的变送器通常和显示仪表、记录仪表和电子调节器配套使用.它可以直接测量各种生产过程中从0℃到1800℃范围的液体、 Industrial assembled thermocouples as temperature transmitters are usually used together with display instruments, recording instruments and electronic regulators. It can directly measure liquids in the range of 0 ° C to 1800 ° C in various production processes,

Surface temperature of vapor and gaseous media and solids. Assembled thermocouples with index number of platinum rhodium 30-platinum rhodium 6, platinum rhodium 10-platinum, nickel chromium-nickel silicon, nickel chromium-constantan, etc. The assembly of thermocouples usually consists of

It consists of the main components such as the fixed device and the junction box.

Thermocouple category code Graduation number Measurement range Basic error limit


Nichrome-Constantan WRK E 0-800 ℃ ± 0.75% t


Nickel chromium-nickel silicon WRN K 0-1300 ℃ ± 0.75% t


Platinum rhodium 13-platinum WRB R 0-1600 ℃ ± 0.25% t


Platinum and rhodium 10-platinum WRP S 0-1600 ℃ ± 0.25% t


Platinum Rhodium 30-Platinum Rhodium 6 WRR B 0-1800 ℃ ± 0.25% t


Note: t is the measured temperature value of the temperature sensing element (℃)

Thermocouple time constant

Thermal inertia time constant (seconds) Thermal inertia time constant (seconds)


Ⅰ 90-180 Ⅲ 10-30


Ⅱ 30-90 Ⅳ < 10


Nominal pressure of thermocouple: Generally refers to the static external pressure that the protection tube can withstand at operating temperature and rupture.

Minimum insertion depth of thermocouple: should be no less than 8-10 times the outer diameter of its protective sleeve (except for special products)

Insulation resistance: When the ambient air temperature is 15-35 ° C and the relative humidity is less than 80%, the insulation resistance is ≥5 Megohm (voltage 100V). Thermocouple with splash-proof junction box, when the relative temperature is 93 ± 3 ℃, the insulation resistance is ≥0.5

Megohm (voltage 100V)

Insulation resistance at high temperature: The insulation resistance (per meter) of the thermocouple (including double-branch) and the protection tube and double-branch hot electrode at the high temperature should be greater than the value specified in the table below.

Specified long-term use temperature (℃) Test temperature (℃) Insulation resistance value (Ω)


≥600 600 72000


≥ 800 800 25000


≥1000 1000 5000


Model Nomenclature of Assembled Thermocouple

Thermocouple without fixing device fixed thread type thermocouple movable flange type thermocouple


Fixed flange type thermocouple flexible tube joint type thermocouple fixed thread conical thermocouple


Straight pipe joint type thermocouple fixed thread joint type thermocouple movable thread pipe joint type thermocouple

作为测量温度的变送器通常和显示仪表、记录仪表和电子调节器配套使用.它可以直接测量各种生产过程中从0℃到1800℃范围 Product features: Industrial assembled thermocouples as temperature transmitters are usually used together with display instruments, recording instruments and electronic regulators. It can directly measure from 0 ° C to 1800 ° C in various production processes.

Surface temperatures of liquid, vapor and gaseous media and solids.


According to national regulations, our company produces assembled thermocouples that conform to the IEC international standard graduation numbers of platinum-rhodium 30-platinum rhodium 6, platinum-rhodium 10-platinum, nickel-chromium-nickel silicon, nickel-chromium- Constantan, and so on.


Assembly thermocouples usually consist of main components such as temperature sensing elements, mounting fixtures, and junction boxes.

Nominal pressure of thermocouple: Generally refers to the static external pressure that the protection tube can withstand at operating temperature and rupture.


The minimum insertion depth of the thermocouple: should be not less than 8-10 times the outer diameter of its protective sleeve (except special products)


Insulation resistance: When the ambient air temperature is 15-35 ° C and the relative humidity is less than 80%, the insulation resistance is ≥ 5 Megohm (voltage 100V). Thermocouple with splash-proof junction box, when the relative temperature is 93 ± 3 ℃, the insulation resistance is ≥0.5 trillion

Europe (voltage 100V)


Insulation resistance at high temperature: The insulation resistance (per meter) of the thermocouple (including double-branch type) and the protection tube and double-branch hot electrode at the high temperature should be greater than the value specified in the table below.



Classification of fabricated thermocouples


1. Thermocouple without fixture

2.Fixed threaded thermocouple

3.Flanged thermocouple

4.Fixed flange thermocouple

5, flexible pipe joint type thermocouple

6, fixed threaded thermocouple

7.Straight pipe joint type thermocouple

8.Fixed thread joint type thermocouple

9. Movable pipe joint type thermocouple

的参数及其他 Parameters of assembled thermocouples and others


1. Technical parameters:

Model specifications: WR series (detachable, armored)

Measuring range: -40 ~ 1700 ℃

Minimum insertion depth: should be no less than 8 to 10 times the outer diameter of its protective tube (except for special products)

Thermal response time: τ0.5 ≤2 ~ 360S

2. Type, measurement range and tolerance:


Note: (1) is the measured temperature value. (2) The measurement range only refers to the even wire.

3. Model selection:


Note: If there are special requirements for the fixing method, connection box, protective tube, etc., please indicate otherwise.