Eckelmann L243 NTC temperature sensor
Accessories for the E*LDS system
Temperature measurement and cable resistance
The temperature sensors are probably the most frequently used accessories in the refrigeration system. However, it depends on the right choice. Due to line resistance over long distances, significant errors can creep in when measuring the temperature. This is particularly important when refrigeration controllers are installed in a central control cabinet.
The temperature measurement with PTC temperature sensors (positive temperature coefficient) such as the Pt1000 already leads to an error of almost 1 Kelvin with two-wire cable runs of around 5 meters (cross-section 0.75 mm²)!
The L243 NTC temperature sensor (negative temperature coefficient) is ideally suited for measuring tasks over longer distances. Due to the favorable operating point, NTC sensors are particularly safe.