Series F6 Horizontal and Vertical Mount Level Switches provide a simple, inexpensive control of the liquid level within a tank. Switch ratings are suitable for many solid-state control systems and monitors or alarms. Hermetically sealed reed switches are actuated by magnets permanently bonded inside the float and can be easily adapted to open or close a circuit on rising or falling levels. Models F6-MHS, F6-HPS-11, F6-SS are internally mounted and are secured to the wall of the tank or vessel from the inside while model F6-HPS-21 is mounted from the outside (externally). Model F6-HPS-31 can be installed by mounting either internally or externally.