Assembly thermocouples are normally used together with display instruments, recording instruments and electronic computers. They directly measure the temperatures of liquid, steam, gas media and solid surfaces in production processes, with a measurement range of 0 to 1300°C. A temperature difference between the measuring end and reference end generates a thermoelectric potential, and the working instrument indicates the corresponding temperature.
- Temperature measurement of liquid, steam and gas media in production processes.
- Solid surface temperature measurement.
- Temperature-measurement applications used with display, recording or electronic computer systems.
- Simple assembly and convenient replacement.
- Spring-loaded temperature-sensing element with good vibration resistance.
- Large measurement range, with a maximum of 1300°C.
- High mechanical strength and good pressure resistance.
- Junction box protection level available in IP65 and IP66.
- Available with no fixed installation, fixed thread, adjustable flange, fixed flange, flexible tube joint type, fixed thread cone type, straight tube fitting type, fixed thread tube fitting type and adjustable thread tube fitting type.
- Vertical pipeline, inclined pipeline and flange installation are available.
- Single or double thermocouple elements are available.
| Item |
Parameter |
| International standard |
IEC60584 |
| National standards |
GB/T18404, GB/T30429 |
| Ambient temperature |
20±15°C |
| Relative humidity |
Not more than 80% |
| Test voltage |
DC 500±50 V |
| Insulation resistance between electrode and outer sleeve |
≥1000 MΩ |
| Insulation resistance of 1 m sample |
1000 MΩ |
| Insulation resistance of 10 m sample |
100 MΩ |
| Model |
Graduation |
Class I temperature range and permissible deviation |
Class II temperature range and permissible deviation |
| WRNK |
K |
-40 to 375°C: ±1.5°C; 375 to 1000°C: ±0.004｜t｜ |
-40 to 333°C: ±2.5°C; 333 to 1200°C: ±0.0075｜t｜ |
| WRMK |
N |
-40 to 375°C: ±1.5°C; 375 to 1000°C: ±0.004｜t｜ |
-40 to 333°C: ±2.5°C; 333 to 1200°C: ±0.0075｜t｜ |
| WREK |
E |
-40 to 375°C: ±1.5°C; 375 to 800°C: ±0.004｜t｜ |
-40 to 333°C: ±2.5°C; 333 to 900°C: ±0.0075｜t｜ |
| WRFK |
J |
-40 to 375°C: ±1.5°C; 375 to 750°C: ±0.004｜t｜ |
-40 to 333°C: ±2.5°C; 333 to 750°C: ±0.0075｜t｜ |
| WRCK |
T |
-40 to 125°C: ±0.5°C; 125 to 350°C: ±0.004｜t｜ |
-40 to 133°C: ±1.0°C; 133 to 350°C: ±0.0075｜t｜ |
| WRPK |
S |
0 to 1100°C: ±1.0°C; 1100 to 1600°C: ±[1+0.003(t-1100)] |
0 to 600°C: ±1.5°C; 600 to 1600°C: ±0.0025｜t｜ |
| WRQK |
R |
0 to 1100°C: ±1.0°C; 1100 to 1600°C: ±[1+0.003(t-1100)] |
0 to 600°C: ±1.5°C; 600 to 1600°C: ±0.0025｜t｜ |
| WRRK |
B |
/ |
600 to 1700°C: ±0.0025｜t｜ |
| Protective tube specification |
Protective tube material |
Thermal response time |
| Φ16 mm |
Non-metallic |
≤240 s |
| Φ16 mm |
Metallic |
≤180 s |
| Φ20 mm |
Metallic |
≤240 s |
| Φ25 mm |
Non-metallic |
≤300 s |
| Conical protective tube |
Metallic |
≤300 s |
| Item |
Options |
| Junction box |
Waterproof type |
| Protective tube diameter/form |
Φ16, Φ20, Φ16 high alumina tube, Φ20 high alumina tube |
| Additional device form |
Variable cross-section (G) |
- WRN-130, including non-metallic protective-tube construction
- WRN-230, WRN-330, WRN-430, WRN-630
- WRN-53, WRN-73, WRN-83, WRN-93
- Required graduation, accuracy class and single- or double-element requirement.
- Measured medium, operating temperature range, pressure and site vibration conditions.
- Installation method, protective-tube material/diameter, overall length L and insertion depth I.
- Vertical, inclined or flange-mounting requirement, and connection dimensions.
- Whether a variable cross-section additional device or straight connector is required.
- Display instruments, recording instruments and electronic computers: assembly thermocouples are normally used with these products.
- Straight connector: TH48 and TH49 series straight connectors are available for pipeline installation.