{"product_id":"5686-b-glass-capsule-sprt","title":"5686-B Glass Capsule SPRT","description":"\u003cp\u003eFluke Calibration's 5686 SPRT covers temperatures from –260 °C to 232 °C. It complies completely with ITS-90 \u0026amp; is small yet reliable \u0026amp; stable.\u003c\/p\u003e\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003ch3\u003e\u003cem\u003ePrecision, Stability, and Reliability for Extreme Temperature Measurement\u003c\/em\u003e\u003c\/h3\u003e\u003ch3\u003ePrimary Standard SPRT for Cryogenic and Immersion Applications\u003c\/h3\u003e\u003cp\u003eThe Fluke 5686-B Glass Capsule Standard Platinum Resistance Thermometer (SPRT) is designed as a primary standard instrument for converting temperature to resistance with uncompromising accuracy. Fully compliant with ITS-90, the 5686-B is part of the trusted Fluke Calibration SPRT family, delivering outstanding performance in both laboratory and demanding field environments.\u003c\/p\u003e\u003ch3\u003eKey Features and Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eITS-90 Compliance\u003c\/strong\u003e – The 5686-B meets the requirements of the International Temperature Scale of 1990 (ITS-90), with resistance ratios:\u003cul\u003e\n\u003cli\u003eW(302.9146 K) ≥ 1.11807\u003c\/li\u003e\n\u003cli\u003eW(234.3156 K) ≤ 0.844235\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExceptional Temperature Range\u003c\/strong\u003e – Covers –260 °C (13 K) to 232 °C (505 K), making it ideal for cryogenic applications and high-precision temperature measurement across a wide spectrum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Design\u003c\/strong\u003e – With a diameter of just 5.8 mm and a length of 56 mm, the 5686-B is well-suited for applications requiring a totally immersed probe or where space is limited.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed-Point Calibration Ready\u003c\/strong\u003e – Fixed-point calibrations are available from –200 °C to 232 °C, ensuring accuracy for critical measurement points.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Construction\u003c\/strong\u003e – The sensing element is made from high-purity platinum wire wound strain-free on a fused silica cross frame, and the special glass capsule is pressure-sealed with 5N pure helium to maintain integrity and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDesigned for Demanding Measurement Environments\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Temperature Excellence\u003c\/strong\u003e – Engineered for operation down to 13 K (–260 °C), the 5686-B is the standard of choice for cryogenic temperature measurement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimized Heat Flow\u003c\/strong\u003e – The glass capsule design supports full immersion, reducing heat flow from or to the sensor and improving measurement stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternative to Long-Stem SPRTs\u003c\/strong\u003e – When traditional long-stem SPRTs are not suitable, the compact 5686-B Glass Capsule SPRT fits into vessels and setups where complete encasement is needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProven Reproducibility, Reliability, and Stability\u003c\/strong\u003e – Each thermometer is carefully annealed and tested for stability, delivering consistent, accurate results in both standard and challenging scenarios.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy Choose the Fluke 5686-B Glass Capsule SPRT?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eWide temperature coverage for both cryogenic and calibration applications\u003c\/li\u003e\n\u003cli\u003eCompact, fully immersible probe design for versatile use\u003c\/li\u003e\n\u003cli\u003eHigh-purity platinum element and strain-free construction for unmatched stability\u003c\/li\u003e\n\u003cli\u003ePressure-sealed capsule maintains sensor protection and performance\u003c\/li\u003e\n\u003cli\u003eMeets rigorous international standards (ITS-90) for trustworthy measurement\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFor laboratories and industries where precise, stable, and reproducible temperature measurement is essential, the Fluke 5686-B Glass Capsule SPRT sets the benchmark for performance and reliability.\u003c\/strong\u003e\u003c\/p\u003e\u003cdiv\u003eModels\u003cul\u003e\u003cli\u003e5686-B\u003c\/li\u003e\u003c\/ul\u003e\n\u003ch2\u003eSpecifications: 5686-B Glass Capsule 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\u003e5686: –260 °C to 232 °C (13 K to 505 K)\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResistance Ratio\u003c\/td\u003e\n\u003ctd\u003eW(302.9146 K) ≥ 1.11807\u003cbr\u003eW(234.3156 K) ≤ 0.844235\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrift Rate\u003c\/td\u003e\n\u003ctd\u003e5686: \u0026lt; 0.005 °C per year over the entire range\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±0.001 °C or better\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eR TPW 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\u003eFilling Gas\u003c\/td\u003e\n\u003ctd\u003e5686: helium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLead Wires\u003c\/td\u003e\n\u003ctd\u003eFour platinum wires, 30 mm long (1.18 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e5686: 5.8 mm dia. x 56 mm long (0.23 x 2.2 in)\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":"5686-B","offer_id":54038946742566,"sku":"5686-B","price":0.0,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/9797\/0214\/files\/2da0ed33-b087-4b66-95d4-b307016ac89e_original__size.jpg?v=1791381065","url":"https:\/\/nplab.shop\/products\/5686-b-glass-capsule-sprt","provider":"NP LAB","version":"1.0","type":"link"}