The AM1880 Standard Platinum Resistance Thermometer (SPRT) interpolates temperature in the range from -200°C to 670°C on the International Temperature Scale of 1990 (ITS-90). It is designed as a primary or secondary standard thermometer, which can be used to calibrate other thermometers and to measure temperature precisely in primary and secondary laboratories.
The sensing element and sensor support utilize a “Birdcage” design and are protected inside a platinum capsule. Compared to the traditional coil-wound method, the “Birdcage” resists mechanical shocks much better and allows for high purity platinum wire to be wound strain-free. The platinum capsule protects the sensing element from contamination at high temperatures. The “Birdcage” structure combined with a 5.56mm Inconel™ sheath makes this SPRT respond very quickly to temperature changes. All parts used in the SPRT are thoroughly cleaned before assembly and the assembly process is well-controlled to protect the sensor from potential contamination. The gas mixture the thermometer is filled with makes the sensor wire oxidation effect as low as possible.
Every AM1880 SPRT is fully tested for stability after manufacture. This world-class probe fully meets the ITS-90 critera for standard thermometers.