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CMT-100 Platinum Resistance Cryogenic Thermometer
Accurate platinum resistance thermometer for 20K–500K cryogenic temperature monitoring. Fast response, compact size, and magnetic field tolerance.
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1. Product Overview
The CMT-100 Platinum Resistance Cryogenic Thermometer is designed for accurate temperature measurement from 20 K to 500 K. Within this range, platinum resistance sensors provide excellent repeatability and nearly constant sensitivity.
With a tolerance of ±1 K, the platinum resistance thermometer can also be applied in magnetic field and radiation environments.
Above 70 K, the thermometer follows the universal IEC751 standard curve, ensuring high interchangeability. The thin-film platinum resistance sensors offered by Vectomag feature a smaller size and faster response time, making them suitable for broader applications.
3. Technical Specifications
- Lead length: 1 m, 4-wire configuration
- Lead material: Four-color phosphor bronze cryogenic wire
- Standard curve: IEC751
- Temperature range: 20 K – 500 K
- Recommended excitation current: 1 mA
- Power dissipation at recommended excitation: 100 µW @ 273 K
- Response time: 1.5 s @ 77 K, 10 s @ 273 K
- Radiation influence: Applicable in radiation environments
- Magnetic field influence: Not recommended below 40 K
- Short-term stability: 5 mK @ 4.2 K, 10 mK @ 77 K (tested for 1 minute in liquid helium, liquid nitrogen, and ice-water mixture)
- Repeatability: ±15 mK @ 77 K (tested through 100 thermal cycles between 300 K and 77 K)
5. System Configuration
- Sensor model: CMT-100 Platinum Resistance Cryogenic Thermometer
- Standard lead: 1 m, 4-wire
- Standard curve: IEC751
2. Key Features
- Compliance with IEC751 standard above 70 K
- Minimal influence from magnetic fields above 40 K
- Negligible impact from ionizing radiation
- Two-point calibration correction available
4. Testable Samples & Applications
- Cryogenic research facilities
- Material testing at low temperatures
- Superconductivity and magnetic field studies
- Laboratory calibration and monitoring
Typical Resistance
| T (K) | R (Ω) | dR/dT (Ω/K) |
|---|---|---|
| 20K | 2.2913 | 0.085 |
| 50K | 9.3865 | 0.360 |
| 77K | 20.38 | 0.423 |
| 150K | 50.788 | 0.409 |
| 300K | 110.354 | 0.387 |
| 500K | 185.687 | 0.347 |
Temperature Range & Accuracy
| Model | Temperature Range | Accuracy |
|---|---|---|
| 2P | 77 K ~ 325 K | ±0.25 K |
| 2P | 325 K ~ 400 K | ±0.9 K |
| 2P | 400 K ~ 475 K | ±1.3 K |
| 2P | 475 K ~ 500 K | ±1.4 K |
| 20L | 20 K ~ 325 K | ±0.1 K |
| 20H | 20 K ~ 325 K | ±0.1 K |
| 70L | 77 K ~ 325 K | ±0.1 K |
| 70H | 77 K ~ 500 K | ±0.1 K |
Temperature accuracy = √(Calibration uncertainty² + Repeatability²)
Physical Properties
| Model | CMT100-BC |
|---|---|
| Mass | 17 mg |
| Leads | 2, AgPd |
| Internal State | Solid |
| Material | Thin-film platinum, ceramic substrate, ceramic encapsulation |
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