Product overview: 5699 High-Temperature Metal-Sheath SPRT
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?
Key Features
- Range up to the aluminum point (660 °C).
- Features Inconel™ and platinum sheaths that guard against contamination .
- Less than 8 mK/year drift.
- Usable in virtually any furnace or bath with temperatures as high as 670 °C.
Specifications: 5699 High-Temperature Metal-Sheath SPRT
| Specifications |
| Temperature Range |
–200 °C to 661 °C (recommended annealing temperature
665 °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 |
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