Description
Low-Temperature Thermometer: The robust secondary SPRT reference thermometer for accurate temperature measurements
Our low-temperature SPRT (Standard Platinum Resistance Thermometer) serves as a robust calibration standard for the most demanding applications in precision temperature measurement. Developed to meet the needs of research, industry, and quality assurance, these thermometers offer excellent accuracy and reliability. Due to their robustness, they are an attractive alternative in daily measurement work to the often very sensitive thermometers with quartz protective tubes.
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Special Features of Secondary SPRT Model 216:
Inert gas filling: The handle of the SPRT is gas-tight, allowing the thermometer to be filled with inert gas. This design protects the thermometer from environmental influences and thus improves its performance, especially at extremely low temperatures. The inert gas filling enables the use of the thermometer at temperatures down to -200 °C, which allows calibration down to the argon triple point at approx. -189 °C.
Temperature range: With an operating range of -200 °C to 250 °C, our secondary SPRT reference thermometer model 216 covers a low temperature range. This makes it a versatile solution for a wide variety of measurement requirements.
Small measurement uncertainties: The precision of the thermometer is underlined by its low measurement uncertainties of only 4.5 mK to 7 mK for a DAkkS-accredited calibration according to DIN EN ISO/IEC 17025. This high level of accuracy ensures reliable results in all areas of application.
Robustness: As a robust alternative to very sensitive SPRTs with quartz sheaths, our secondary SPRT reference thermometer is characterized by its metal sheath and stable measuring resistors. It is therefore ideal for long-term use.
New SPRT sensor: The SPRT temperature sensor newly developed by Klasmeier has been improved in the following areas:
- fast response time
- low hysteresis
- low self-heating
- excellent reproducibility and stability
DAkkS-certified calibration of low-temperature SPRTs
In our in-house DAkkS-accredited calibration laboratory, we offer high-precision calibration services for low-temperature SPRTs. Our accreditation guarantees that every calibration is performed according to the internationally recognized standards of DIN EN ISO/IEC 17025. This ensures seamless traceability to national and international standards.
Our secondary SPRT reference thermometer for low temperatures is specifically designed to be calibrated at temperatures down to the argon triple point. This enables applications in the very low temperature range that require reliable temperature measurement.
| Range | Temperature fixed points | Measurement uncertainty |
| -189.3442 °C – 0.01 °C | Argon to water | 6 mK |
| -38.8344 °C – 0.01 °C | Mercury to water | 6 mK |
| 0.01 °C – 29.7646 °C | Water to gallium | 6 mK |
| 0.01 °C – 156.5985 °C | Water to indium | 6 mK |
| 0.01 °C – 231.928 °C | Water to tin | 7 mK |
What makes our calibration special?
Traceability: Through our DAkkS accreditation, every calibration is directly linked to national and international standards. This gives you the assurance that your measurement results are recognized worldwide.
Measurement uncertainty: The accuracy of our calibration is based on a careful evaluation of all uncertainty components, including the reproducibility of the thermometer, the ITS-90 deviation function, the self-heating, and the hysteresis of the sensor.
Application range: With the detailed information from the calibration certificate, you can use your low-temperature SPRT in the temperature range from -189 °C to 232 °C with full confidence.
