Shrunk-on Thermocouple (Thermal Resistor)
Product Overview
Section titled “Product Overview”The Shrunk-on Thermocouple (Thermal Resistor) is designed for temperature measurement in power stations, including 300 MW, 600 MW and 1000 MW generating units and their auxiliary equipment. It can directly measure the temperature of liquid, steam, gas media and solid surfaces. The applicable temperature range for the thermocouple and thermal resistor is -200 to 800°C.
Applications
Section titled “Applications”- 300 MW, 600 MW and 1000 MW generating units and their auxiliary equipment.
- Temperature measurement of liquid, steam and gas media.
- Surface temperature measurement of solids.
Product Advantages
Section titled “Product Advantages”- Designed for temperature measurement applications in power generating units and their auxiliary equipment.
- K-type and N-type thermocouples, or Pt100, Cu50 and Cu100 thermal resistors, are available as sensing elements.
- Multiple main structural models are available for selection according to the on-site installation structure.
- Insulation resistance requirements are specified for both thermocouples and thermal resistors under defined ambient temperature, humidity and test-voltage conditions.
Installation Method
Section titled “Installation Method”Structural drawings and installation diagrams are available for the main models. During selection, confirm the applicable main model and installation dimensions according to the site piping, installation sleeve and measuring-point structure.
Key Parameters
Section titled “Key Parameters”Applicable Temperature Range
Section titled “Applicable Temperature Range”| Item | Parameter |
|---|---|
| Applicable temperature range for thermocouple (thermal resistor) | -200 to 800°C |
Thermocouple Tolerance
Section titled “Thermocouple Tolerance”| Graduation | Accuracy Class | Temperature Range | Permissible Deviation |
|---|---|---|---|
| WRN / K | Class I | -40 to 375°C | ±1.5°C |
| WRN / K | Class I | 375 to 1000°C | ±0.004|t| |
| WRN / K | Class II | -40 to 333°C | ±2.5°C |
| WRN / K | Class II | 333 to 1200°C | ±0.0075|t| |
| WRM / N | Class I | -40 to 375°C | ±1.5°C |
| WRM / N | Class I | 375 to 800°C | ±0.004|t| |
| WRM / N | Class II | -40 to 333°C | ±2.5°C |
| WRM / N | Class II | 333 to 900°C | ±0.0075|t| |
Note: t is the absolute value of the measured temperature.
Thermal Resistor Specifications
Section titled “Thermal Resistor Specifications”| Model | Graduation | Temperature Range | Accuracy Class | Permissible Deviation |
|---|---|---|---|---|
| WZP | Pt100 | -200 to +500°C | Class A | ±(0.15+0.002|t|)°C |
| WZP | Pt100 | -200 to +500°C | Class B | ±(0.30+0.005|t|)°C |
| WZC | Cu50 / Cu100 | -50 to +100°C | - | ±(0.30+0.006|t|)°C |
Note: t is the absolute value of the measured temperature.
Insulation Resistance
Section titled “Insulation Resistance”| Product Type | Ambient Conditions | Test Conditions | Insulation Resistance |
|---|---|---|---|
| Thermocouple | Ambient temperature (20±15)°C; relative humidity ≤80% | DC (500±50)V | ≥1000MΩ |
| Thermal resistor | Ambient temperature 15 to 35°C; relative humidity ≤80% | DC 10 to 100V | ≥100MΩ |
Main Models
Section titled “Main Models”| Main Model |
|---|
| WRN-01A |
| WRN-01B |
| WRN-12 |
| WRN-12G |
| WRN-13A |
| WRN-13B |
| WRN-14 |
| WRN-15 |
Inquiry and Selection Information
Section titled “Inquiry and Selection Information”Please provide the following information for main-model confirmation and quotation:
- Generating-unit capacity and the name of the applicable auxiliary equipment.
- Measured medium or object: liquid, steam, gas or solid surface.
- Measuring range and normal operating temperature.
- Required sensing element: K-type or N-type thermocouple, or Pt100, Cu50 or Cu100 thermal resistor.
- Required accuracy class.
- On-site installation structure and matching requirements for the installation sleeve and piping connection.
- Required main model and installation dimensions.