Standard Platinum Resistance Thermometer
Product Features
0℃～419.527℃ （medium temperature）
-189.3442℃～419.527℃ （full temperature）
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Description
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Introduction
The standard platinum resistance thermometer is a standard instrument for temperature measurement based on the characteristic that the resistance value of metal platinum wire changes with the single value of temperature. The ITS-90 international temperature scale stipulates that the standard platinum resistance thermometer is an interpolation instrument between 13.8033K (-259.3467°C) and 961.78°C.
The standard platinum resistance thermometer is the thermometer with the highest accuracy and the best stability when measuring temperature under the current production conditions. The standard platinum resistance thermometer is a measurement standard instrument used to transmit the international temperature scale. In the verification of various standard mercury thermometers; industrial platinum and copper thermal resistance thermometers; precision thermometers are used as standards. It can also be directly used for temperature measurement with higher accuracy requirements.
Technical Parameters
| Temperature range | 0 to 419.527℃ |
| Rtp(Ω) | 25 or 100 |
| sensitivityΩ/℃ | 0.1 |
| Resistance ratio | WGa≥1.11807 |
| Casing type | Superalloy |
| Casing outer diameter | Φ6.5mm |
| Casing length | 470±10mm |
| project | Stability requirements for the first Calibration of thermometers | ||
| work benchmark | first class standard | second standard | |
| Rtp | 3 | 4 | 8 |
| WAl | 5 | 10 | 20 |
| WAn | 4 | 8 | 16 |
Stability requirements for thermometers in use
| project | The difference between multiple divisions of each fixed point | The difference between the test results of two adjacent cycles | ||||
| work benchmark | first class | second class | work benchmark | first class | second class | |
| Rtp | 2 | 2.5 | 5 | 3 | 5 | 20 |
| WAl | 2 | 4 | 6 | 6 | 12 | 24 |
| WZn | 1.5 | 2 | 4 | 4.5 | 9 | 18 |
| WSn | 1.2 | 1.8 | 3.6 | 3.5 | 7 | 14 |
| WIn | 1.2 | 1.8 | 3.6 | 3.5 | 7 | 14 |
| WCa | 1 | 1.5 | 3 | 2 | 4 | 8 |
| WHg | 1.2 | 1.8 | 3 | 2 | 5 | 10 |
| WAr | 1.5 | 3 | 6 | 4 | 8 | 16 |
Natural heating effect and thermoelectric potential
| project | work benchmark | first class | second class |
| natural effect /mK | 2 | 3 | 4 |
| thermoelectric potential | 0.6 | 0.8 | 1.5 |
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