Fluke Calibration

5699 High-Temperature Metal-Sheath Standard Platinum Res...

Affordable working standard SPRT with a range to aluminum point

$7,427.00 CAD
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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 in 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.

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

Temperature Range -200C - 670C
Nominal RTPW 25.5 Ω (+/- 0.5 Ω)
Current 1 mA
Resistance Ratio W (302.9146 K) ≥ 1.11807
W (234.3156 K) ≤ 0.844235
Sensitivity 0.1 Ω/C
Drift Rate < 0.008C/year
(< 0.003C/year typical)
Repeatability < 1 mK
Self-Heating at TPW < 0.001C under 1 mA current
Reproducibility +/- 0.001C or better
RTPW Drift After Thermal Cycling < 0.001C
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 661C
> 1000 MΩ at 20C