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5686-B Users Guide
Introduction:
The Fluke Calibration Glass Capsule Standard Platinum Resistance Thermometer (SPRT) is designed to be the best primary standard interpolating instrument converting temperature to resistance. The Fluke 5686 Glass Capsule SPRT is a member of the Fluke Calibration SPRT family (Figure 1). The 5686 SPRT is primarily designed for the following two applications: used in low temperature range down to 13 K (–260 °C), or used where a totally immersed probe is prefered to minimize the heat flow from or to the sensor. Long stem SPRTs are not suitable for some applications where the probe should be encased into a vessel completely. The 5686 SPRT covers the range from 13 K (–260 °C) to 505 K (232 °C).
The 5686 is carefully annealed at the appropriate temperatures and precisely tested for stability. The sensing elements are fabricated using high-purity platinum wire wound in a strain-free design on a fused silica cross frame. The special glass capsule of the 5686 is pressure sealed with 5N pure helium.
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