Hydrostatic Head Level Switches
Hydrostatic Head Level Switches



  • Salt water disposal systems 
  • Cooling towers 
  • Crude oil tanks 
  • Waterflood systems
  • Diesel day tanks 
  • Sumps


The DF series are diaphragm operated “hydrostatic head pressure” level switches. A pressure sensitive diaphragm operates a snap-switch that can be wired directly to electric pilot circuits to control pumps at predetermined levels. Typical application is to start and stop electric driven pump(s) to maintain tank levels. It is also applicable to engine driven pumps.


The nitrile sensing diaphragm is impervious to most liquids and is sensitive enough to control levels with 1/4 in. repeatability. See model descriptions for limits of switch trip point adjustability. Materials include aluminum body, glass-filled nylon bottom plate and a special alloy leaf snapswitch as standard.


This simple level switch is highly reliable and can be worked into almost any new or existing system without major modification or special tools.


DF755 and DF757 are suitable for atmospheric tanks in a non-hazardous area. The SPDT snap-switch for the DF755 is preset for a 4 in. differential in liquid level. The DF757 trip point is adjustable over a 108 in. differential. DF755EX is the same as the DF755 except for hazardous areas.


Download PDF

Please fill the form to download the PDF