FLUKE QUARTZ-SHEATH SPRTS
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All the features you expect in world-class SPRTs
- Drift rates as low as 0.0005 K
- Proprietary gas mixture ensures high stability
- Most experienced SPRT design team in the business
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FLUKE QUARTZ-SHEATH SPRTS
All the features you expect in world-class SPRTs
- Drift rates as low as 0.0005 K
- Proprietary gas mixture ensures high stability
- Most experienced SPRT design team in the business
Choosing the right platinum thermometer as your primary standard may be the most critical purchase decision in your lab. Unfortunately, other manufacturers are pretty secretive about how their SPRTs are made. They won’t tell you much more than you can already see by looking at one. Long-term reputation used to be a reliable indicator, but the leaders of a few decades ago have lost their original craftsmen and design scientists. There are only a few active SPRT design groups in the world today.
Specifications :
5681 |
5683 |
5684 |
5685 |
|
| Temperature Range | –200 °C to 670 °C |
–200 °C to 480 °C |
0 °C to 1070 °C† |
0 °C to 1070 °C† |
| Nominal RTPW | 25.5 Ω | 0.25 Ω | 2.5 Ω | |
| Current | 1 mA | 14.14 mA | 5 mA | |
| Resistance Ratio | W(302.9146 K) ≥ 1.11807 and W(234.3156 K) ≤ 0.844235 |
W(302.9146 K) ≥ 1.11807 and W(1234.93 K) ≥ 4.2844 |
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| Sensitivity | 0.1 Ω/°C | 0.001 Ω/°C | 0.01 Ω/°C | |
| Drift Rate | < 0.002 °C/100 hours at 661 °C (typically < 0.001 °C) |
< 0.001 °C/100 hours at 480 °C (0.0005 °C typical) |
< 0.003 °C/100 hours at 1070 °C (typically < 0.001 °C) |
|
| Sensor Support | Quartz glass cross | Quartz glass strip with notches |
Quartz glass cross | |
| Diameter of Sensor Pt Wire |
0.07 mm (0.003 in) | 0.4 mm (0.016 in) | 0.2 mm (0.008 in) | |
| Protective Sheath | Quartz glass, Diameter: 7 mm (0.28 in), Length: 520 mm (20.5 in) | Quartz glass, Diameter: 7 mm (0.28 in), Length: 680 mm (26.8 in) | ||
| †The official maximum temperature of an SPRT as a defining interpolation instrument of the ITS-90 is 961.78 °C, but these types of SPRTs were found to be stable up to at least 1070 °C. The annealing temperature during the stability test was 1085 °C. The lower temperature limit of these types of SPRTs can be as low as –200 °C. In general, it is suggested that a 25-ohm SPRT be used below 0 °C. |
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