- Other Fluke companies:
- Fluke
- Fluke Biomedical
- Fluke Networks
- Fluke Process Instruments
See more Fluke brands
Designed for metrology work requiring small SPRTs
- Temperatures from –260 °C (13 K) to 232 °C
- Stability typically 0.001 °C over 100 °C range
- Miniature capsule package eliminates stem conduction
Sometimes you would like to make SPRT measurements but traditional SPRTs are too long or awkward for a particular application. Now Fluke Calibration makes a miniature glass capsule SPRT, which is perfect for cryogenics, calorimetry, and other metrology work requiring small SPRTs.
The 5686 is a true SPRT. The high-purity platinum wire is hand-wound on a glass cross frame in a strain-free design. The glass capsule is designed to match the thermal expansion of the platinum wire to ensure a true seal at all operating temperatures. The capsules are pressure sealed and come protected in their own maple case.
The 5686 complies completely with ITS-90 and has the following resistance ratios:
W(302.9146 K) ≥ 1.11807
and
W(234.3156 K) ≤ 0.844235
The 5686 covers temperatures from –260 °C to 232 °C, so it’s perfect for cryogenic applications. It is 5.8 mm in diameter and 56 mm long. Fixed-point calibrations are available for the model 5686 from –200 °C to 232 °C.
These SPRTs are small but meet customary SPRT performance for reproducibility, reliability, and stability. They solve many of the problems associated with taking precision measurements in situations unsuitable for traditional-length SPRTs.
| Specifications | |
| Temperature Range | 5686: –260 °C to 232 °C (13 K to 505 K) |
| Nominal RTPW | 25.5 Ω |
| Resistance Ratio | W(302.9146 K) ≥ 1.11807 W(234.3156 K) ≤ 0.844235 |
| Drift Rate | 5686: < 0.005 °C per year over the entire range |
| Self-heating at TPW | < 0.002 °C under 1 mA current |
| Reproducibility | ±0.001 °C or better |
| R TPW Drift After Thermal Cycling | < 0.001 °C |
| Filling Gas | 5686: helium |
| Lead Wires | Four platinum wires, 30 mm long (1.18 in) |
| Size | 5686: 5.8 mm dia. x 56 mm long (0.23 x 2.2 in) |
| Accessory | Description |
|---|---|
| 1911-4-9 |
PRT Calibration, –200 °C to 232 °C, NVLAP Accredited |
Sidebar Request a Quote
Request a quote
We'd like your feedback.
You can help us improve our website »
Thank you!
If you purchased an item from a Fluke authorized distributor, please contact them directly with questions regarding Certificates of Calibration or other documentation.
Support requests for items purchased from, or serviced directly by Fluke and general Metrology questions can be submitted via our online Support Request form and a Fluke representative will be in contact with you.