The APG FS-400 vertical float switch features all stainless steel wetted materials including a 316L stem and float, as well as a 15-7 retainer. The standard temperature range for the FS-400 is -40° to 383°F (-40° to 195°C), which can be optionally upgraded to -40° to 500°F (-40° to 260°C) for higher temperature applications. The standard temperature FS-400 is rated for up to 200 psi (13.8 bar), while the high temperature model is rated for up to 500 psi (34.5 bar).

The switch for the APG FS-400 vertical float switch is rated for 24 and 120 VDC, as well as 120 and 240 VAC. This switch comes standard as normally open (NO), but is user-reversible and can be configured as normally closed (NC). With less than 3.5 inches from the top of the threads to the end of the stem, this APG vertical float switch is an ideal fit for OEM, water and wastewater and chemical applications.