Standard Platinum Resistance Thermometers (SPRTs) are 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. AM1960 and AM1950 SPRTs are the crown jewels of AccuMac temperature probes. It’s taken decades of our scientific expertise and original craftsmanship to create these world class products. They fully meet the ITS-90 criteria for standard thermometers, while offering a very competitive price.
Both of our quartz-sheath SPRTs feature an extremely low drift rate. The sensing element and sensor support have been specially designed to reach the best performance in stability and repeatability. To protect the platinum sensing wire from contamination at high temperatures, all parts used in the thermometer are cleaned extremely well before assembly. The assembly process is well controlled to protect the sensor from any potential contamination. The gas mixture the thermometers are filled with makes the sensor wire oxidation effect as low as possible. Every SPRT is fully tested for stability after manufacture.