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Hart Scientific 5699 - High-Temperature Metal-Sheath SPRT (–200°C to 670°C)

Hart Scientific 5699 - High-Temperature Metal-Sheath SPRT (–200°C to 670°C)

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Dostupnosť: na požiadanie


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  • Range to aluminum point (660°C )
  • Inconel™ and platinum sheaths guard against contamination
  • Drifts less than 10 mK/year with normal use
  • Many calibration options available including by fixed point
  • Fifth wire provides shield ground

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?

Specifications 

Temperature Range 

–200 °C to 670 °C 

Nominal RTPW 

25.5W (±0.5W

Current 

1 mA 

Resistance Ratio 

W(302.9146K) ³ 1.11807 

W(234.3156K) £ 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 


Ordering Information 

5699-S 

Extended Range Metal-Sheath SPRT 

Maple carrying case included 




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