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?
–200 °C to 670 °C
W(302.9146K) ³ 1.11807
W(234.3156K) £ 0.844235
< 0.008 °C/year
(< 0.003 °C/year typical)
< 1 mK
Self-heating at TPW
< 0.001 °C under 1 mA current
±0.001 °C or better
RTPW Drift After Thermal Cycling
< 0.001 °C
Diameter of Pt Sensor Wire
Four sensor wires plus grounding wire
> 100 MW at 661 °C
Extended Range Metal-Sheath SPRT†
|†Maple carrying case included|