Platinum Temperature Sensors

Pickering offer a range of resistance cards which may be used to simulate resistive temperature sensors.

Platinum temperature sensors offer a defined conversion between temperature and resistance which is almost linear. They are normally described by their temperature coefficients and their resistance at 0°C.

The most commonly used sensor conforms to the DIN EN 60751 standard, which is also replicated in many other international standards. It is commonly referred to as IEC 751.

The relationship between resistance and temperature is accurately defined by the Callendar-Van Dusen equation.

R = R0 * ( 1 + At + Bt² + C*(t - 100) * t³)

Where R0 is the resistance at 0°C, t is the temperature and the coefficients A, B and C are defined by the device characteristics.

Temperature coefficients and Callendar-Van Dusen Coefficients for IEC751 device

Temperature
Coefficient

0.00385

A

3.908 e-03

B

-5.775 e-07

C

-4.183 e-12

The coefficient C only applies for temperatures below 0°C, above 0°C its value is 0, reducing the equation to 2nd order.


Note: A software library designed for use in conjunction with the normal drivers is available from Pickering. This library includes the Callendar-Van Dussen coefficients for the main sensor types and allows the programmer to easily convert between temperature and resistance.

http://downloads.pickeringtest.info/downloads/drivers/Utility_Software/pi_prt.zip

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