RC12 W EEX magnetic switch- 2G EEx m II T6 -40°C/+70°C Reed contact as change-over contact with 3m connection cable. The solenoid switch as reed contact (option -EX, -EZ) is suitable for all solenoid valves from 4.0mm valve stroke and externally medium controlled valves from nominal diameter DN13mm. The signal is given by a permanent magnet which is connected to the sealing element (piston or diaphragm) via a spindle. This type of position indication is contactless.