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Resistance Temperature Detector PT100

Take a look at our Technical Notes on Temperature

The Geosense® PT100 temperature sensor contains a platinum resistance thermometer that changes resistance value as its temperature changes and provides accurate and reliable long-term temperature measurements. These sensors are often used in the extremely harsh environments found within Geotechnical monitoring.

The platinum element is housed inside a rugged enclosure and sealed with a special sealing material to ensure efficient thermal distribution and has IP68 waterproofing.

The principle of operation is to measure the resistance of a platinum element and in accordance with DIN/IEC 6075.

The relationship between temperature and resistance is approximately linear over a wide temperature range.

The linearisation equation is:

Rt = R0 * (1 + A* t + B*t2 + C*(t-100)* t3)


Rt is the resistance at temperature t, R0 is the resistance at 0 °C, and

A = 3.9083 E–3

B = -5.775 E–7

C = -4.183 E–12 (below 0 °C), or

C = 0 (above 0 °C)


Temperature range -50 to +300 ºC
Temperature coefficient of resistance (TCR) 0.00385 O/O/°C, 0 - 100°C
Accuracy ±0.15°C at 0°C, ±0.35°C at 100°C
Resolution 0.1 ºC
Housing PVC or Stainless steel
Housing diameter 16mm
Housing length 65mm
Cable diameter 5mm