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Metal-Sheath SPRT

Metal Sheathed SPRT

Metal-Sheath SPRTs    Models 5680 and 5682

Inconel sheaths allow use in harsh environments

Affordable true primary standard

Meet all ITS-90 requirements from –200°C to 480°C

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Specifications

Temp. Range

–200°C to 480°C

Nominal RTPW

5680: 25.5W (±0.5W)
5682: 100W (±1.0W)

Current

5680: 1 mA
5682: 0.5 or 1.0 mA

Resistance Ratio

W(234.315K) £ 0.844235
W(302.9146K) ³ 1.11807

Sensitivity

5680: 0.1W/°C
5682: 0.4W/°C

Drift Rate

< 0.01°C/100 hours at 480°C (typically < 0.005°C)

Repeatability

< 1 mK

Diameter of Pt Sensor Wire

5680: 0.003" (0.07 mm)
5682: 0.0016" (0.04 mm)

Protective Sheath

Inconel
Diameter: 0.25" (6.35 mm)
Length: 19.1" (485 mm)

Lead Wires

Four sensor wires plus grounding wire

Want a metal-sheathed SPRT? We’ve got a great one for you.

While the temperature range of metal-sheath SPRTs is narrower than that of quartz-sheath SPRTs, they’re perfect for salt baths, baths that require metal blocks for increased stability (Hart baths don’t need metal blocks), and dry-wells.

Even if you don’t have a special use for them such as a salt bath, the price and performance of these SPRTs allow you to use them in other situations that are inappropriate for quartz models.

The metal element in the Model 5680 is high-purity platinum with a unique ceramic shield for high-temperature work. The quality construction of these SPRTs produces drift typically less than 0.005°C at 0°C after 100 hours at 480°C. This is excellent repeatability for an SPRT in this price range. In fact, this isn’t just excellent reproducibility, stability, and reliability—the performance of these SPRTs is so good that no other company in the business can match it for this price.

Hart offers a variety of calibration options, including fixed-point calibrations in our own lab. At Hart, we’ll give it to you any way you want it!

Why use a lesser instrument when you can have the true performance of an SPRT for about the same investment? There’s no reason to put off buying SPRT-quality measurement ability or having competent backup to your quartz-sheath sensors.

Use our Feedback Form for more information, to request a catalog or for a Price Quote