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Our company mainly produces primary instruments such as thermocouples and thermal resistors, and the assembled thermocouples we produce adopt IEC standards. At the same time, a series and spectrum of thermocouples designed uniformly by the Ministry of Machinery and Electronics Industry are adopted. Overview
Industrial assembled thermocouples are commonly used as transmitters for measuring temperature, in conjunction with display instruments, recording instruments, and electronic regulators It can directly measure the surface temperature of liquids, vapors, gases, and solids in the range of 0 ℃ to 1800 ℃ during various production processes.
According to national regulations, our company produces prefabricated thermocouples such as Platinum Rhodium 30-Platinum Rhodium 6, Platinum Rhodium 10 Platinum, Nickel Chromium Nickel Silicon, Nickel Chromium Copper, etc. that comply with IEC standard division numbers.
The assembly of thermocouples usually consists of main components such as temperature sensing elements, installation fixtures, and junction boxes.Optional models Type B, S, K, EMain technical parameters Measurement range and basic error limit
| Thermocouple category |
code name |
graduation mark |
measurement range |
Basic error limit |
| Nickel chromium constantan |
WRK |
E |
0－800℃ |
±0.75%t |
| Nickel chromium nickel silicon |
WRN |
K |
0－1300℃ |
±0.75%t |
| 铂铑13-铂 |
WRB |
R |
0-1600℃ |
±0.25%t |
| 铂铑10－铂 |
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 level |
Time constant (seconds) |
Thermal inertia level |
Time constant (seconds) |
Ⅰ |
90-180 |
Ⅲ |
10-30 |
Ⅱ |
30-90 |
Ⅳ |
＜10 |
◆ Thermocouple nominal pressure: generally refers to the static external pressure that the protective tube can withstand and rupture at the working temperature.
The minimum insertion depth for thermocouples should not be less than 8-10 times the outer diameter of their protective sleeve (except for special products)
◆ Insulation resistance: When the ambient air temperature is 15-35 ℃ and the relative humidity is less than 80%, the insulation resistance is ≥ 5 megohms (voltage 100V). Thermocouples with splash proof junction boxes have an insulation resistance of ≥ 0.5 megohms (voltage 100V) when the relative temperature is 93 ± 3 ℃
◆ Insulation resistance at high temperatures: For thermocouples, the insulation resistance (per meter) between the hot electrode (including the double branch type) and the protective tube, as well as between the double branch hot electrodes, should be greater than the values specified in the table below.
Designated long-term use temperature (℃) |
Test temperature (℃) |
Insulation resistance value (Ω) |
| ≥600 |
600 |
72000 |
| ≥ 800 |
800 |
25000 |
| ≥1000 |
1000 |
5000 |
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