The 5686 is a true SPRT. The high-purity platinum wire is hand-wound on a glass cross frame in a strain-free design.
W(302.9146 K) ≥ 1.11807
W(234.3156 K) ≤ 0.844235
The 5686 covers temperatures from –260 °C to 232 °C, so it’s perfect for cryogenic applications. It is 5.8 mm in diameter and 56 mm long. Fixed-point calibrations are available for the model 5686 from –200 °C to 232 °C.
These SPRTs are small but meet customary SPRT performance for reproducibility, reliability, and stability. They solve many of the problems associated with taking precision measurements in situations unsuitable for traditional-length SPRTs.
|Temperature Range||5686: –260 °C to 232 °C (13 K to 505 K)|
|Nominal RTPW||25.5 Ω|
|Resistance Ratio||W(302.9146 K) ≥ 1.11807 W(234.3156 K) ≤ 0.844235|
|Drift Rate||5686: < 0.005 °C per year over the entire range|
|Self-heating at TPW||< 0.002 °C under 1 mA current|
|Reproducibility||±0.001 °C or better|
|R TPW Drift After Thermal Cycling||< 0.001 °C|
|Filling Gas||5686: helium|
|Lead Wires||Four platinum wires, 30 mm long (1.18 in)|
|Size||5686: 5.8 mm dia. x 56 mm long (0.23 x 2.2 in)|
|1911-4-9||PRT Calibration, –200 °C to 232 °C, NVLAP Accredited|