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Visit other Fluke companies for calibration equipment and services in electrical, power, pressure, flow, RF, and more.
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High-Temperature Metal-Sheath Standard Platinum Resistance Thermometer, SPRT - 5699 |
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Phone: 801-763-1600
Specifications |
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| Temperature Range | –200 °C to 670 °C |
| Nominal RTPW | 25.5 W (± 0.5 W) |
| Current | 1 mA |
| Resistance Ratio | W(302.9146 K) ³ 1.11807 W(234.3156 K) £ 0.844235 |
| Sensitivity | 0.1W/ °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 MW at 661 °C > 1000 MW at 20 °C |
SPRTs designed by Hart Scientific 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 Hart’s 5699 Extended Range Metal-Sheath SPRT combines all the advantages of a Hart-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 is conveniently available from Hart’s own primary standards laboratory, including fixed-point calibrations covering any range between –200 °C and 661 °C.
At Hart, 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?
Ordering Information |
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| 5699-S | Extended Range Metal-Sheath SPRT† |
| †Maple carrying case included | |
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