AKS / EKS, Temperature sensors AKS / EKS, Temperature sensors Temperature sensors are temperature dependent resistance sensors. Sensors in the AKS series are mainly for use in commercial and industrial refrigeration plants where the requirements on grade of enclosure and temperature range are high. The sensors are adjusted and meet the tolerance requirements of DIN IEC 751 class B. Sensors in the EKS series are mainly for use in air conditioning and comfort applications where there is a focus on the design of the unit and where the requirements to the temperature regulation are less demanding. The EKS sensors consist of a PTC element (1000 ohm at 25°C).