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683 Floatswitch for Atmospheric Vessels up to 2 psig

The Model 683 Floatswitch is a float type control which completes an electrical circuit to a pump, valve, alarm or other device, when the liquid level in the vessel rises (or lowers) to a predetermined point.


The float arm passes through a nylon reinforced diaphragm with a special nut on each side of the diaphragm; the switches are attached to the float arm by means of stainless steel supports. The diaphragm acts as a pivot point for the float arm, and as a seal between the vessel and the explosion proof switch housing. The maximum travel of the float between the switch “make” and “break” is 1″ for mercury switches and 1/4″ for micro switches.

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683 Floatswitch for Atmospheric Vessels up to 2 psig


  • Corrosion Proof: Float and Arm are 304 S.S., Cad Plated Steel Vessel Connection (Other materials available for more corrosive liquids).
  • No Wearing Parts: Due to the pivoting action of the float arm on the diaphragm, sticking does not occur in thick or corrosive liquids.
  • Variety of Switch Outputs: The 683 can be obtained with mercury or micro switch output and in various combinations, ie. SPST, SPDT, DPDT, etc.
  • Adjustments: Nothing to adjust or get out of calibration on the mercury switches. Micro switches can be adjusted from the outside when the floatswitch is installed on the vessel.
  • Simple Installation: On an INTERNAL MOUNT, the float passes through a 2″ nipple. On an EXTERNAL MOUNT, install on 2″ external pipe riser connected to the pressure vessel above the high level and below the low level control points.
  • Longer Life: Since there are no wearing parts, the replacement of stuffing boxes, etc. is eliminated.


  • Switch Housing: Cast Aluminum
  • Operating Pressure: Atmospheric to 2 psig
  • Operating Temperature . . . . . . . . . . . . . . . . . . -20˚F to +225˚F
  • Electrical Connection: 1/2″ Female Pipe Thread
Switch Ratings

683SA, 683SB: SPST Mercury

  • 10 A @120 VAC, 5 A @ 240 VAC
  • 3 A @ 440 VAC

683SC: SPDT Mercury

  • 4 A @ 120 VAC, 2 A @ 240 VAC
  • 1 A @ 440 VAC

683SF: SPDT Micro Switch

  • 15 A @ 125, 250 or 480 VAC
  • /8 HP-125 VAC, 1 /4 HP-250 VAC
  • 1 /2 A @ 125 VDC, 1 /4 A @ 250 VDC

683SG: DPDT Micro Switch

  • 10 A @ 125 or 250 VAC
  • 0.3 A @ 125 VDC; 0.15 A @ 250 VDC

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