It's included in Cylinder, Threaded - M8 so you can find it easily. It is possible to use the proximity sensors at -40°C~85°C. A proximity sensor's supply voltage should be set to 30V for maximum efficiency. Despite their low operating temperature -25°C, proximity sensors are still able to function. In order to operate, proximity sensors must have an operating temperature below 70°C. Reed switches are designed to use reed switches with internal contacts that pass 100mA current.