It's included in Cylinder, Threaded - M8 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 5kHz so that the proximity sensor switch can function properly. Reed switches are designed to use reed switches with internal contacts that pass 10mA current.