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![AccuMac AM1850 [AM1850-100] Secondary Standard Platinum Resistance Thermometers (SPRT), 100Ω, 480 mm Probe Length, -328 to 932°F (-200 to 500°C)](image/cache/wp/gp/image/AccuMac_AM1850-800x800.webp "AccuMac AM1850 [AM1850-100] Secondary Standard Platinum Resistance Thermometers (SPRT), 100Ω, 480 mm Probe Length, -328 to 932°F (-200 to 500°C)")
![AccuMac AM1850 [AM1850-100] Secondary Standard Platinum Resistance Thermometers (SPRT), 100Ω, 480 mm Probe Length, -328 to 932°F (-200 to 500°C)](image/cache/wp/gp/image/AccuMac_AM1850-closed-800x800.webp "AccuMac AM1850 [AM1850-100] Secondary Standard Platinum Resistance Thermometers (SPRT), 100Ω, 480 mm Probe Length, -328 to 932°F (-200 to 500°C)")
![AccuMac AM1850 [AM1850-100] Secondary Standard Platinum Resistance Thermometers (SPRT), 100Ω, 480 mm Probe Length, -328 to 932°F (-200 to 500°C)](image/cache/wp/gp/image/AccuMac_AM1850-100x100.webp "AccuMac AM1850 [AM1850-100] Secondary Standard Platinum Resistance Thermometers (SPRT), 100Ω, 480 mm Probe Length, -328 to 932°F (-200 to 500°C)")
![AccuMac AM1850 [AM1850-100] Secondary Standard Platinum Resistance Thermometers (SPRT), 100Ω, 480 mm Probe Length, -328 to 932°F (-200 to 500°C)](image/cache/wp/gp/image/AccuMac_AM1850-closed-100x100.webp "AccuMac AM1850 [AM1850-100] Secondary Standard Platinum Resistance Thermometers (SPRT), 100Ω, 480 mm Probe Length, -328 to 932°F (-200 to 500°C)")
The AccuMac AM1850 (AM1850-100) is a high-precision Secondary Standard Platinum Resistance Thermometer (SPRT) designed for primary and secondary calibration laboratories. It features a nominal resistance of 25 Ω at the Triple Point of Water (TPW) and replaces fragile quartz glass sheaths with a rugged Inconel 600 sheath to maximize durability in dry block calibrators and fluid baths. Standard Platinum Resistance Thermometers (SPRTs) are commonly used to interpolate temperature in the range from -189.3442°C to 660.323°C on the International Temperature Scale of 1990 (ITS-90). They are widely used as standard or reference thermometers to calibrate other thermometers and to measure temperature precisely in primary and secondary laboratories. It’s taken decades of our scientific expertise and original craftsmanship to create these world class SPRTs. An ISO/IEC 17025 accredited calibration is included. Both the AM1860 and the AM1850 SPRTs feature a very low drift rate. To improve the durability of these SPRTs, Inconel 600 is used in place of quartz glass for the sheath material of the thermometer. A special capsule is adopted to protect the platinum sensor wire from contamination introduced by a metal sheath at high temperatures. All parts used in the thermometer are thoroughly cleaned and treated at high temperature before assembly. The gas mixture filling the thermometer is well-controlled to reduce the oxidation effect as much as possible. These world class probes fully meet the ITS-90 criteria of standard thermometers at a very competitive price. They are widely used as reference thermometers for drywell block calibrators and temperature baths.
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