Sensor Float® Mini

Mercury-Activated, Narrow-Angle Control Switch

sensor float mini

The Sensor Float® Mini control switch is used to accurately monitor high (normally open) or low (normally closed) liquid levels to activate pump control panels and alarms in confined sewage and non-potable water applications.

Normally Open Models (high level): The control switch turns on (closes) when the float tips slightly above horizontal signaling a high level and turns off (opens) when the float drops slightly below horizontal.

Normally Closed Models (low levels): The control switch turns on (closes) when the float tips slightly below horizontal signaling a low level and turns off (opens) when the float tips slightly above horizontal.

This switch is not sensitive to rotation. Contact SJE Rhombus regarding intrinsically safe applications.

sensor float mini


  • Designed for use in confined spaces
  • Control differential of .5 inches (1 cm) above or below horizontal
  • For normally open (high level) or normally closed (low level) applications
  • In standard cable lengths of 10, 15, 20, or 30 feet (3, 5, 6, or 10 meters) – longer lengths available
  • Two mounting options for flexibility in installation:
    • Mounting Clamp: for applications where the float can be attached to a discharge pipe or similar mounting device
    • Externally Weighted: for applications where the float can be suspended from above
UL Listed, CSA Certified
Five-Year Limited Warranty


  • Flexible 18 gauge, 2 conductor (UL, CSA) SJOW, water-resistant (CPE) jacket
  • 2.81 inches diameter x 3.42 inches long (7.14 x 8.68 cm) high impact, corrosion resistance, PVC housing for use in sewage and non-potable water up to 140°F (60°C)
  • 30 feet (9 meters), 13 PSI (90 kPa)
  • Single pole, single throw, mercury-to-metal contacts, hermetically sealed in a steel capsule and epoxy sealed in the float housing
  • 5 amps, 120/230 VAC, 50/60 Hz

NOTE: This switch is not recommended for controlling electrical loads less than 30 milliamps, 12 VAC and non-arcing electrical loads (intrinsically safe applications).


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