{"product_id":"5698-25-working-standard-sprt","title":"5698-25 Working Standard SPRT","description":"\u003cp\u003e5698-25 SPRT from Fluke Calibration meets ITS-90 SPRT guidelines, has a drift rate of 0.003 °C \u0026amp; covers a temperature range from –200 °C to 670 °C.\u003c\/p\u003e\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003ch3\u003e\u003cem\u003eTrue Standard Platinum Resistance Thermometer for Reliable Laboratory Performance\u003c\/em\u003e\u003c\/h3\u003e\u003ch3\u003eAccurate, Trusted, and Fully Specified for Your Lab\u003c\/h3\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003ch3\u003eKey Features and Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue ITS-90 Standard\u003c\/strong\u003e – 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Measurement Range\u003c\/strong\u003e – With a temperature range from –200 °C to 670 °C, the 5698-25 covers most laboratory, industrial, and research calibration needs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExceptional Stability and Low Drift\u003c\/strong\u003e – 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrain-Free Platinum Sensor\u003c\/strong\u003e – 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust, Sealed Construction\u003c\/strong\u003e – 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Compatibility\u003c\/strong\u003e – 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Calibration Options\u003c\/strong\u003e – Available with or without calibration. Calibrations are performed in Fluke’s accredited lab using fixed-point or comparison methods, providing full ITS-90 traceability and maximum value for your investment.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDesigned as a Working Standard\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is a Working Standard?\u003c\/strong\u003e – 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication Flexibility\u003c\/strong\u003e – Suited for both standards transfer and daily calibration tasks, with robust construction to withstand routine use in busy calibration environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTransparent, Reliable, and Supported\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Performance Specifications Provided\u003c\/strong\u003e – Unlike some manufacturers, Fluke publishes complete specifications for the 5698-25, so you know exactly what you’re getting before you buy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComprehensive Support\u003c\/strong\u003e – 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.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003eModels\u003cul\u003e\u003cli\u003e5698-25\u003c\/li\u003e\u003c\/ul\u003e\n\u003ch2\u003eSpecifications: 5698-25 Working Standard SPRT\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003ctd colspan=\"2\"\u003eSpecifications\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e–200 °C to 670 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal R\u003csub\u003eTPW\u003c\/sub\u003e\n\u003c\/td\u003e\n\u003ctd\u003e25.5 Ω (± 0.5 Ω)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent\u003c\/td\u003e\n\u003ctd\u003e1.0 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResistance Ratios\u003c\/td\u003e\n\u003ctd\u003eW(234.315 K) ≤ 0.844235\u003cbr\u003eW(302.9146 K) ≥ 1.11807\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity\u003c\/td\u003e\n\u003ctd\u003e0.1 Ω\/°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrift Rate\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.006 °C\/100 hours at max temperature (typically \u0026lt; 0.003 °C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSelf-heating at TPW\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.002 °C under 1 mA current\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReproducibility\u003c\/td\u003e\n\u003ctd\u003e± 0.0015 °C or better\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eR\u003csub\u003eTPW\u003c\/sub\u003e Drift After Thermal Cycling\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.001 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter of Pt Sensor Wire\u003c\/td\u003e\n\u003ctd\u003e0.07 mm (0.003 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtective Sheath\u003c\/td\u003e\n\u003ctd\u003eQuartz Glass\u003cbr\u003eDiameter: 7 mm (0.28 in)\u003cbr\u003eLength: 485 mm (19.1 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLead Wires\u003c\/td\u003e\n\u003ctd\u003eFour sensor wires\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cdiv role=\"tabpanel\" aria-labelledby=\"models-label\" class=\"tab-pane\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Fluke","offers":[{"title":"5698-25","offer_id":54038946939174,"sku":"5698-25","price":0.0,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/9797\/0214\/files\/577443e7-39bf-4642-b580-b3070171ed70_original__size.jpg?v=1791381072","url":"https:\/\/nplab.shop\/products\/5698-25-working-standard-sprt","provider":"NP LAB","version":"1.0","type":"link"}