The R800 series standard platinum resistance thermometers conforming to the International Temperature Scale, 1990 (ITS-90) have been commercialized under the guidance of the National Research Laboratory of Metrology.
| The thermometers cover from vapor point of helium to freezing point of silver. |
| Various models are prepared for low temperature and high temperature. |
| Fixed point calibration and precision comparison calibration are available. |
| Model | Specification |
| R800-0 | Standard platinum resistance thermometer for low temperature |
| R800-2 | Standard platinum resistance thermometer for medium temperature |
| R800-3 | Standard platinum resistance thermometer for high temperature |
| R800-3L | Low resistance type standard platinum resistance thermometer for high temperature |
| R800-9 | Standard platinum resistance thermometer |
| R800-4 | Platinum-Cobalt resistance thermometer for cryogenic temperature |
| Model | R800-0 | R800-2 | R800-3 | R800-3L | R800-9 | R800-4 |
| Measuring range | 13K to 30°C | 90K to 661°C | 0°C to 962°C | 90K to 300°C | 4K to 0°C | |
| Resistance value(at 0°C) | 2.55Ω±1Ω | 2.55Ω±0.1Ω | 0.25Ω± 0.01Ω | 100Ω± 1Ω | 100Ω± 4Ω | |
| Measuring current | 1mA | 1 to 10mA | 1mA | |||
| Temperature characteristic | R(-38.8344°C)/R(0.01°C) 0.844235 | R(29.7646°C)/R(0.01°C) 0.844235 | R(29.7646°C)/R(0.01°C) 1.11807 and R(961.78°C)/R(0.01°C) 4.2844 | R(100°C)/R(0°C) 1.3920 | -- | |
| Sensitivity | 0.1Ω/K | 0.01Ω/K | 1mΩ/K | 0.4Ω/K | Min. 0.09Ω/K (at 12K) Max. 0.40Ω/K | |
| Sealed gas | Helium gas | Mixture gas (argon and oxygen) | Helium gas | |||
| Connecting lead wire | 4-conductor type platinum wire 0.3mm x 35mm | 4-conductor type cabtyre cord 2m with gold plated | 4-conductor type platinum wire 0.3mm x 35mm | |||
| Frame | Cross quartz | Cross mica | Cross quartz | |||
| Protection tube | Capsule type platinum sheath 5mm x 43mm | Delustered quartz tube (7.0 ± 0.5mm x 600mm | Delustered quartz tube (7.0 ± 0.5mm x 700mm | Delustered quartz tube (7.0 ± 0.5mm x 600mm | Capsule type platinum sheath 5mm x 43mm | |
| Performance Specification Sheet | Standard Resistance Thermometers | R800 | Download |
