AM1950 Quartz-Sheath SPRT Probe


Standard Platinum Resistance Thermometers (SPRTs) are used to interpolate tempera-ture 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. AM1950 and AM1960 SPRTs are the crown jewels of AccuMac temperature probes. It takes decades of our scientific expertise and original craftsmanship to create these world class prod-ucts. They feature a very low drift rate.

To reach the best performance in stability and repeatability, the sensing element and sensor support are specially designed. To protect the platinum sensing wire from contamination at high temperature, all parts used in the thermometer are extremely cleaned before assembly. The assembly process is well controlled to protect the sensor from contamination. The gas mix-ture filled in the thermometer makes the sensor wire oxidation effect as low as possible. Every SPRT is fully tested for stability after manufactured. This world class probe meets ITS-90 crite-ria of standard thermometer fully with a very competitive pricing.

AM1950 has a temperature range from -200°C to 500°C. AM1960 covers range from -200°C to 670°C.


Temperature Range  AM1950 ( –200°C to 500°C )
AM1960 ( –200°C to 670°C )
Rtpw  Nominal 25Ω
Resistance Ratio  W(Ga) ≥ 1.11807
W(Hg) ≤ 0.844235
Drift at TPW  AM1950 ΔR(TPW) <0.002°C/100hrs. At 500°C
ΔR(TPW) <0.004°C/Year.
AM1960 ΔR(TPW) <0.003°C/100hrs. At 670°C
ΔR(TPW) <0.005°C/Year.
Repeatability  ±0.001°C
Thermal Shock  ±0.001°C after 10 times thermal cycles from minimum to maximum temperature.
Self-Heating  0.0015°C at 1mA Current
Measurement Current  1 mA
Sensor Length  42mm.
Insulation Resistance  >1,000MΩ at room temperature
Sheath Material  Fused-Quartz
Dimension  AM1950 – Ø 7mm. x 480mm. (Length)
AM1960 – Ø 7mm. x 500mm. (Length)
Recommended immersion Depth  AM1950 – at least 105mm. deep
AM1960 – at least 105mm. deep
External Leads  Insulated Copper Wire, 4-Wire , 2.5Meters.
Termination  Gold-Plated Spade
Handle Dimension  21mm. X 80mm.
Calibration  Not Included
Carrying Case  Not included


Order No. 5007 – NIST Traceable Certificate of Calibration ( –200°C to 670°C )
Order No. 9002 – Complementary Wooden Carrying Case.
AM8060 Dual-Channel Precision Thermometer Readout
AM8040 Single-Channel Precision Thermometer Readout

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