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Affordable working standard SPRT
- Range to aluminum point (660 °C )
- Inconel™ and platinum sheaths guard against contamination
- Less than 8 mK/year drift
- Many calibration options available including by fixed point
- Fifth wire provides shield ground
SPRTs designed by Fluke Calibration are known for their outstanding reliability and minimal long-term drift. They have been calibrated by national (and other primary) laboratories and proven repeatedly to outperform competitive models. Now Fluke Calibration’s 5699 Extended Range Metal-Sheath SPRT combines all the advantages of a Fluke Calibration-designed sensor with the protective sheathing materials that allow your SPRT to be used in virtually any furnace or bath with temperatures as high as 670 °C.
Designed and manufactured by our primary standards metrologists, the strain-free sensing element in the 5699 meets all ITS-90 requirements for SPRTs and minimizes long-term drift.
After one year of regular usage, drift is less than 0.008 °C (< 0.003 °C is typical). Even lower drift rates are possible depending on care and handling. A fifth wire for grounding is added to the four-wire sensor to help reduce electrical noise, particularly for AC measurements. Finally, you can get an improved version of an old industry-standard Inconel-sheathed SPRT.
The 5699 is constructed with a 0.219-inch-diameter Inconel sheath for high durability and fast response times. Inside the sheath, the sensing element is protected by a thin platinum housing that shields the sensor from contamination from free-floating metal ions found within metal environments at high temperatures. Reduced contamination means a low drift rate—even after hours of use in metal-block furnaces at high temperatures.
If you choose not to calibrate the 5699 yourself, a wide variety of options are available from Fluke Calibration’s own primary standards laboratory, including fixed-point calibrations covering any range between –200 °C and 661 °C.
At Fluke Calibration, we use SPRTs every day. We design them, build them, calibrate them, use them as standards, and know what it takes to make a reliably performing instrument. Why buy from anyone else?
| Specifications | |
| Temperature Range | –200 °C to 670 °C |
| Nominal RTPW | 25.5Ω (± 0.5Ω) |
| Current | 1 mA |
| Resistance Ratio | W(302.9146 K) ≥ 1.11807 W(234.3156 K) ≤ 0.844235 |
| Sensitivity | 0.1 Ω/ °C |
| Drift Rate | < 0.008 °C/year (< 0.003 °C/year typical) |
| Repeatability | < 1 mK |
| Self-heating at TPW | < 0.001 °C under 1 mA current |
| Reproducibility | ± 0.001 °C or better |
| RTPW Drift After Thermal Cycling | < 0.001 °C |
| Diameter of Pt Sensor Wire | 0.07 mm (0.003 in) |
| Lead Wires | Four sensor wires plus grounding wire |
| Protective Sheath | Inconel |
| Diameter: | 5.56 mm ± 0.13 mm (0.219 in ± 0.005 in) |
| Length: | 482 mm (19 in) |
| Insulation Resistance | > 100 MΩ at 661 °C > 1000 MΩ at 20 °C |
| Accessory | Description |
|---|---|
| 1911-4-7 |
PRT Calibration, –200 °C to 660 °C, NVLAP Accredited |
| Product Manuals |
|---|
5680/5682/5699 Metal Sheath Standard Platinum Resistance Thermometer User’s Guide (142.62 KB) |
| On-Demand Webinars |
|---|
| Overcoming Drift: Tips to Maintaining Your PRTs |
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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.