It's included in Cylinder, Threaded - M18 so you can find it easily. It is possible to use the proximity sensors at -25°C~70°C. A proximity sensor's supply voltage should be set to 24V for maximum efficiency. It is important that the rate of the proximity sensor be set at 1.2kHz so that the proximity sensor switch can function properly. Reed switches are designed to use reed switches with internal contacts that pass 500μA current.