Resistance Thermometer meets ITS-90 ratio requirements.

Press Release Summary:



Model 5698 Working Standard Platinum Resistance Thermometer features strain-free 25 ohm pure platinum sensor. Enclosed in 19 in. quartz glass sheath, unit covers temperatures from -200 to +661°C. Long-term drift is specified at ±0.006°C after 100 hr at maximum temperature. Calibration options include both fixed-point and comparison calibrations.



Original Press Release:


Model 5698 Working Standard SPRT


Hart Scientific, A Fluke Company, introduces its new Model 5698 Working Standard SPRT (standard platinum resistance thermometer) that provides true SPRT performance at a price much lower than competing models: $2,200.

The 5698 meets all ITS-90 ratio requirements for SPRTs and features a completely strain-free, 25-ohm, pure platinum sensor. Enclosed in a 19-inch quartz glass sheath, the 5698 covers temperatures from -200°C to 661°C. Long-term drift is specified at ±0.006°C after 100 hours at maximum temperature. Typical drift after the same experience is just ±0.003°C.

The 5698 was developed by Hart's Xumo Li and Mingjian Zhao, who have over 35 years combined experience developing thermometry and thermometer calibration standards.

Calibration options for the 5698 include both fixed-point and comparison calibrations by Hart Scientific. Hart's temperature calibration laboratory is NVLAP-accredited.

Also available from Hart are SPRT readout devices such as the Model 1590 Super-Thermometer II, which reads the 5698 accurately within 0.001°C at 0°C.

Availability of the 5698 is three weeks. Allow three additional weeks for calibration by comparison or five additional weeks for calibration by fixed-point, if calibration is desired.

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