AM1750 Secondary Reference PRT


  • Affordable reference probe
  • Accuracy ±0.015 °C at 0.01 °C
  • Temperature range: -200 °C to 670 °C
  • Customized dimensions available



AM1750 series Secondary Reference PRT provides our customers an affordable reference probe for precision temperature measurement and calibration in labs and fields. The PRT features accuracy of ±0.015°C at 0.01°C ; short term stability of ±0.007°C.  Two different lengths of PRTs 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
  • Accuracy: ±0.015 °C at 0.01°C
  • Long term drift: ±0.01 °C
  • Short term stability: 0.007 °C
  • Durable and shock resistance
  • Temperature Coefficient 0.003925
  • W(Ga)>=1.11807
  • Inconeltm sheath
  • Customized dimensions available


Temperature Range
1750-12: -200°C to 670°C
1750-20: -200°C to 670°C
Resistance at 0 °C
Nominal 100 Ω
Temperature Coefficient
0.003925 Ω/ Ω/°C
±0.025°C at -196 °C
±0.015°C at 0.01 °C
±0.035°C at 420 °C
±0.05°C at 660 °C
±0.01°C at 0 °C after 100 hours at 660 °C
Short Term Stability
Thermal Shock
±0.005°C after 10 times thermal cycles from minimum to maximum temperatures
50 mW/°C
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
32 mm
Sensor Location
5 mm from tip
Insulation Resistance
>1000 MΩ at room temperature
Sheath Material
1750-12: 0.25 inch X 12 inch (6.35 mm X 305 mm)
1750-20: 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
1750-12-T, PRT with NIST traceable calibration and data
1750-20-T, PRT with NIST traceable calibration and data
NVLAP - Accredited Calibrations available per request

Optional Accessories

Carrying Case for 1750-12
Carrying Case for 1750-20

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