5698-25 Working Standard Platinum Resistance Thermometer
All the features you expect in a world-class SPRT
The 5698 Working Standard SPRT is a true SPRT. It meets the ITS-90 ratio requirements for SPRTs and includes a Hart-designed, completely strain-free platinum sensor. With a 485 mm quartz sheath, this 25 Ω SPRT covers a temperature range from –200°C - 670°C. Long-term drift, which we define as the change in output resistance at the triple point of water after 100 hours at 670°C, is (after converting to temperature) less than 6 mK—typically less than 3 mK.
The 5698 is the perfect companion to a Fluke 1595A Super-Thermometer, which reads 25 Ω SPRTs to within 0.015 mK at 0°C and includes a number of convenient features for working with SPRTs. Requiring 1 mA of excitation current, the 5698 can also be used easily with a Fluke Black Stack, or even a Chub-E4 Thermometer.
• Conforms to ITS-90 SPRT guidelines
• Drift rate typically 0.003°C
• Calibration options by fixed point
• Unmatched performance-to-price-ratio
