5698-25 Working Standard SPRT

  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getAggregateRating, 171.11ms
  • REVIEWS, PRODUCT
  • bvseo-msg: HTTP status code of 404 was returned;
  • 5698-25 Working Standard SPRT

Key features

  • Conform to ITS-90 SPRT guidelines and have a typical drift rate of 0.003 °C.
  • Calibration options by fixed point.
  • 485-mm quartz sheath, this 25-ohm SPRT covers a temperature range from –200 °C to 670 °C.
  • Long-term drift isless than 6 mK—typically less than 3 mK.

Product overview: 5698-25 Working Standard SPRT

Priority Gold Instrument CarePlan

Make sure to ask your account manager about the Fluke Calibration Priority Gold CarePlan

A Fluke Calibration Priority Gold CarePlan puts you in control of your downtime and in control of your business, with calibration services and other offerings.

Learn more

True Standard Platinum Resistance Thermometer for Reliable Laboratory Performance

Accurate, Trusted, and Fully Specified for Your Lab

The Fluke 5698-25 Working Standard Standard Platinum Resistance Thermometer (SPRT) is designed for those who demand uncompromising accuracy, stability, and transparency in their laboratory temperature standards. Fully compliant with ITS-90 requirements and meticulously engineered for long-term reliability, the 5698-25 is the ideal choice for transferring standards from calibration labs to working labs and for supporting critical measurement processes.

Key Features and Benefits

  • True ITS-90 Standard – Meets the full resistance ratio requirements for SPRTs under the International Temperature Scale of 1990 (ITS-90), ensuring the highest level of traceability and measurement confidence.
  • Wide Measurement Range – With a temperature range from –200 °C to 670 °C, the 5698-25 covers most laboratory, industrial, and research calibration needs.
  • Exceptional Stability and Low Drift – Typical long-term drift is less than 3 mK (and guaranteed below 6 mK) at the triple point of water after 100 hours at 670 °C—ensuring reliable performance over time.
  • Strain-Free Platinum Sensor – The sensing element is made from high-purity platinum wire, wound in a completely strain-free configuration on a fused silica cross frame, then annealed and tested for optimum stability.
  • Robust, Sealed Construction – Features a 485-mm fused silica sheath, pressure sealed with a special argon/oxygen gas mix, convection prevention discs to reduce stem errors, and a terminal box handle with strain relief. Wires are terminated with gold-plated spade lugs for secure connections.
  • Easy Compatibility – Works seamlessly with Fluke 1594A/1595A Super-Thermometer, 1560 Black Stack, or 1529 Chub-E4 Thermometer readouts, thanks to its standard 25-ohm resistance and 1 mA excitation current requirement.
  • Flexible Calibration Options – Available with or without calibration. Calibrations are performed in Fluke’s NVLAP-accredited lab using fixed-point or comparison methods, providing full ITS-90 traceability and maximum value for your investment.

Designed as a Working Standard

  • What is a Working Standard? – A working standard is used to transfer the ITS-90 from a national or standards laboratory to your facility. The 5698-25 is carefully calibrated against intrinsic references, making it the backbone of your lab’s traceability chain.
  • Application Flexibility – Suited for both standards transfer and daily calibration tasks, with robust construction to withstand routine use in busy calibration environments.

Transparent, Reliable, and Supported

  • Full Performance Specifications Provided – Unlike some manufacturers, Fluke publishes complete specifications for the 5698-25, so you know exactly what you’re getting before you buy.
  • Comprehensive Support – Benefit from Fluke Calibration’s renowned post-purchase support and calibration service options, ensuring your working standard maintains the best possible performance for years to come.

Specifications: 5698-25 Working Standard SPRT

Specifications
Temperature Range–200 °C to 670 °C
Nominal RTPW25.5 Ω (± 0.5 Ω)
Current1.0 mA
Resistance RatiosW(234.315 K) ≤ 0.844235
W(302.9146 K) ≥ 1.11807
Sensitivity0.1 Ω/°C
Drift Rate< 0.006 °C/100 hours at max temperature (typically < 0.003 °C)
Self-heating at TPW< 0.002 °C under 1 mA current
Reproducibility± 0.0015 °C or better
RTPW Drift After Thermal Cycling< 0.001 °C
Diameter of Pt Sensor Wire0.07 mm (0.003 in)
Protective SheathQuartz Glass
Diameter: 7 mm (0.28 in)
Length: 485 mm (19.1 in)
Lead WiresFour sensor wires

Models: 5698-25 Working Standard SPRT

5698-25
25 Ω Working Standard SPRT with maple carrying case. 
Calibration not included.Contact your Fluke Calibration representative for additional calibration options.

Buy it
1912-4-7

PRT Calibration, –200 °C to 660 °C, NVLAP Accredited


Buy it
  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getContent, 65.77ms
  • QUESTIONS, PRODUCT
  • bvseo-msg: HTTP status code of 404 was returned;
  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getReviews, 26.4ms
  • REVIEWS, PRODUCT
  • bvseo-msg: HTTP status code of 404 was returned;
Please enable cookies to view product reviews.
Chat with ourFluke assistant
Clear Chat