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Thermocouple Assemblies

Supplied with a temperature transmitter, the industrial thermocouple assembly is often used in combination with display instruments, temperature recorders and electronic regulators, so as to offer direct surface temperature measurement to liquids, steam, gases, and solids. Its measuring range spans from 0℃ to 1800℃.

Specialized in various styles of temperature sensors, we can provide IEC standard thermocouple assemblies. The material combinations include Platinum 30% rhodium / Platinum 6% rhodium, Platinum 13% rhodium / Platinum, Platinum 10% rhodium / Platinum, Nickel-chromium / Nisil, Nickel-chromium / Constantan, etc.

Technical Specifications
Conductor combination Code Type Temperature range Intrinsic error
Nickel-chromium / Constantan WRK E 0 - 800 ℃ ±0.75%t
Nickel-chromium / Nisil WRN K 0 - 1300 ℃ ±0.75%t
Platinum 13% rhodium / Platinum WRB R 0-1600 ℃ ±0.25%t
Platinum 10% rhodium / Platinum WRP S 0 - 1600 ℃ ±0.25%t
Platinum 30% rhodium / Platinum 6% rhodium WRR B 0 - 1800 ℃ ±0.25%t

Remark: t refers to the measured temperature (℃) by the temperature sensing element.

Time Constant of Thermocouple Assembly
Thermal inertia level Time constant (sec.) Thermal inertia level Time constant (sec.)
90 - 180 10 - 30
30 - 90 <10

Nominal pressure: refers to the max. external pressure that the thermowell can withstand under operating temperature

Min. insertion depth: ≥ 8-10 times of the external diameter of thermowell (excluding specialty products)

Insulation resistance: When ambient temperature is 15~35℃ and the relative humidity< 80%, the insulation resistance ≥ 5MΩ at voltage of 100V

For thermocouple assemblies with splashproof junction box, the insulation resistance ≥0.5MΩ at voltage of 100V, when the relative temperature is 93± 3℃

Insulation resistance under high temperature conditions:
Under high temperature conditions, the insulation resistance (wire length: one meter) between the thermode (including duplex thermode) and thermowell, as well as the insulation resistance between two duplex thermodes should be higher than the value shown in following table.

Working temperature ( ℃ ) Testing temperature ( ℃ ) Insulation resistance (Ω)
≥600 600 72000
≥ 800 800 25000
≥1000 1000 5000

While placing orders for the thermocouple assembly, please offer us the following parameters, thus allowing us to select a proper model for you.
1. Temperature range
2. Thermowell diameter
3. Thermowell material
4. Thermocouple type
5. Process connection
6. Insertion depth and total length

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