As an added convenience, the Cylinder, Threaded - M8 package includes it. Temperatures of -25°C~70°C are ideal for proximity sensors. To maximize the efficiency of proximity sensors, it is recommended that the supply voltage be set to 24V. It is possible to operate proximity sensors at -25°C. A proximity sensor cannot operate at a temperature higher than 70°C. If the rate is 1.1kHz, then the proximity sensors will function. Reed switches work well with proximity sensors when their internal contacts pass 500μA current.