AccuMac – AM1760/1762 Secondary SPRTs

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  • Rtpw Drift < 19 mK after 500 hours
  • Accuracy ?0.006 ?C at 0.01 ?C
  • Temperature range: -200 ?C to 670 ?C
  • Customized dimensions available

AM1760 series Secondary Standard PRT provides our customers an affordable SPRT alternative for precision temperature measurement and calibration in labs and fields. This SPRT features accuracy of ±0.006°C at 0.01°C , short term stability of ±0.002°C and very low drift rate of less than 19 mK after 500 hours. Two different lengths of SPRTs are available at 12-inch and 20-inch.
The sensing element is designed to protect the platinum sensing wire from contamination at high temperatures, giving the device a high level of stability and repeatability in performance. A uniquely designed support structure and filling material provides excellent balance between the hysteresis effect, mechanical shock and thermal shock performance. This high performance probe fully meets ITS-90 criteria for reference thermometers.

Temperature Range
-200°C to 670°C
Resistance at 0 °C
1760 – Nominal 100 Ω
1762 – Nominal 25 Ω
Temperature Coefficient
0.003925 Ω/ Ω/°C
±0.007°C at -196 °C
±0.006°C at 0.01 °C
±0.015°C at 420 °C
±0.025°C at 660 °C
±0.004°C at 0 °C after 100 hours at 660 °C
Short Term Stability
Thermal Shock
±0.002°C after 10 times thermal cycles from minimum to maximum temperatures
0.0015 °C at 1 mA current
Response Time
9 seconds for 63% response to step change in water moving at 3 feet per second
Measurement Current
0.5 mA or 1 mA
Sensor Length
42 mm
Sensor Location
5 mm from tip
Insulation Resistance
>1000 MΩ at room temperature
Sheath Material
1760/1762-12: 0.25 inch X 12 inch (6.35 mm X 305 mm)
1760/1762-20: 0.25inch X 20 inch (6.35 mm X 500 mm)
External Leads
Teflontm –insulated copper wire, 4 leads, 2.5 meters
Handle Dimension
15mm (OD) X 65 mm (L)
Handle Temperature Range**
-50°C to 180°C
Calibration Options
1760/1762-12-T, Secondary SPRT with NIST traceable calibration and data
1760/1762-20-T, Secondary SPRT with NIST traceable calibration and data
  *Long-term drift rate is for reference only. It could be affected by such facts as handling, application, and maintenance, etc.
  **Handle temperature outside this range will cause damage to the probe.

Additional information