Model 711

SKU: 711

Float Switch, Top Inserted, Two Point, Wide Separation

The Model 711Float Switch provides two point alarms with from 6 to 65 inches of elevation spacing between the two switching points. A float rides on the surface of the liquid. Its horizontal position is maintained by the stroke rod as the liquid level varies. The 711 produces two widely spaced switch actions. The normal application would be for high/low alarm. Note that the liquid must not leave significant coatings or deposits on the rod.

The attractor and inner works is supported at the midpoint of its travel by a spring. The float is supported by the liquid and is free to slide up and down on the rod. Rising level carries the float up until it contacts the upper stop. The rod is then lifted which carries the attractor into the field of the station magnet. The magnet pulls in against the outside of the sealing tube and the switch activates. Falling level drops the float away from the upper stop. The attractor moves down and the switch deactivates.

Similarly, falling level carries the float down until it contacts the lower stop. The weight of the float pushes the rod down, lowers the attractor so that it is in front of the magnet, and the lower switch actuates. It deactuates when the float rises above the stop and the spring pulls the attractor out of the field of the lower switch station magnet.

The 711 will do many jobs that would otherwise require the use of two separate conventional float switches. This results in cost savings for both the equipment and the decreased amount of installation required. The switching points may be easily changed in the field by repositioning the stops

Options: The Model 711 Option D has a single switching station and is normally used to control a pumping action in a process vessel or storage tank. The station activates when the sensing float rises to the upper stop and lifts the guide rod attractor into the field of the station magnet. The station stays activated until the float moves down against the lower stop. The guide rod-attractor is then pulled down out of the magnetic field and the switch station deactivates. It remains in that condition until the float again rises up against the upper stop and activates the switch.


  • Two alarm points
  • Horizontal position maintained by stroke rod
  • High and low alarm
  • Liquid supported float
  • Does the job of two conventional float switches


  • Available Wetted Materials: 316 Stainless Steel, carbon steel
  • Insertion (Below Process Connection): ≤ 10 ft
  • Switch Action: 1 to 4 points of alarm and/or differential
  • Specific Gravity: 0.35 to 2.40
  • Temperature Range:-150 °F to +750 °F (-101 °C to +399 °C)
  • Pressure : -15 psig to +1200 psig (-1.0 bar to +82.7 bar)
  • Process Connection:
  • Threaded:1.0 in to 4.0 in NPT
  • Flanged:2.0 in to 8.0 in
  • Rating: ≤ 300 lb ANSI flanges or Greloc® hub DIN or JIS equivalents

Certifications & Approvals

  • Third Party Listed by CSA NRTL/C (USA and Canada)
    Class I, Division 1, Groups B, C and D;
    Class II, Division 1, Groups E, F and G;
    Class III, Division 1
    Class I, Zone 1, Ex d IIB+H2
    Class I, Zone 1, AEx d IIB+H2

Required Ordering Information

  • Detailed model number
  • Tag or nameplate detail (if required)
  • Documentation/testing tiers (if required, refer to Additional Resources in the product catalog)
  • Process fluid or material name*
  • Process fluid or material specific gravity
  • Maximum process temperature
  • Maximum process pressure

Additional Information


Float Switch, Top Inserted, Two Point, Wide Separation

Level Measurement


Accessories and Related Products