Starting price
฿350
/ °C
Type K Thermocouple (Chromel-Alumel)
Model: Type K
The Type K thermocouple (Chromel-Alumel) is the most widely deployed temperature sensor in Thai industry, covering -200 to +1260°C. It suits ovens, furnaces, and heating processes in food, rubber, and metal industries with a sensitivity of ~41 µV/°C at 250°C. Correction values should be applied using ITS-90 reference tables for highest accuracy. Calibration is performed by comparison against a NIMT-traceable reference probe in a controlled furnace or dry-block calibrator.
Meas. Range
-200–1260 °C
Accuracy
±1.5°C (Class 1) / ±2.5°C (Class 2)
Specifications
| Connector | Miniature or standard K-type connector |
| Sensitivity | ~41 µV/°C (at 250 °C) |
| Temperature Range | -200 to +1260 °C |
| Accuracy (Class 1) | ±1.5°C or ±0.004|T| (whichever is greater) |
| Accuracy (Class 2) | ±2.5°C or ±0.0075|T| |
| Reference Standard | IEC 60584-1, ASTM E230 |
Use Cases
Monitoring sterilizer oven temperatures in pharma, pasteurization in food plants, environmental chambers, and metal heat treatment processes.
Frequently Asked Questions
How often should a Type K thermocouple be calibrated?+
Annually in most applications, but every 6 months for use above 600°C where oxidation-driven drift is significant, especially for unsheathed types.
Why does Type K drift more than PT100 at lower temperatures?+
Below 200°C, Type K exhibits hysteresis and drift from ordering phenomena in the crystal structure. PT100 RTDs are more stable in that range — choose PT100 if ±1°C accuracy is needed from room temperature to 200°C.
What must a calibration certificate include?+
Reference temperature values, measured values, correction factors, measurement uncertainty, and a traceability chain to NIMT or an internationally recognized NMI, per ISO/IEC 17025.
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