For non-conductive media, as explosion-proof version. The new liquid alarm sensor type KS3 EX replaces the KS2.EX. The KS3 EX is an adequate replacement for the KS2.EX model. The former KS2 plastic enclosure has been replaced by a rugged aluminium case. In association with the new Type Examination Certificate, the temperature range of the liquid alarm sensor has been extended to -20 °C up to 50 °C (~-4 °F up to 122 °F).