The Murphy Hydrostatic Head Level Switch DF757 is a diaphragm operated “hydrostatic head pressure” level switch. 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. (6 mm) repeatability. Materials include aluminum body, nylon bottom plate and a special alloy leaf snap-switch 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. The DF757 is suitable for atmospheric tanks in a non-hazardous area. The DF757 trip point is adjustable over a 108 in. (2743 mm) differential.
Applications: Water Flood Systems • Crude Oil Tanks • Salt Water Disposal Systems Systems • Diesel Day Tanks • Sumps • Cooling Towers.
- Cooling Towers
- Crude Oil Tanks
- Waterflood Systems
- Diesel Day Tanks
- Salt Water Disposal Systems
- Adjustable Snap-Switch
- Part No.: DF757
- Snap-switch Ratings SPDT: 5 A @ 125, 250, or 480 VAC • 1/2 A @ 125 VDC, 1/4 A @ 250 VDC
- Case/Lid: Aluminum
- Bottom Plate: Glass-filled Nylon
- Process Connection: 1 NPT
- Maximum Pressure Rating: 25 psi (172 kPa [1.72 Bar])
- Conduit Connection (electrical): 1/2 NPT
- Dimensions: See image #2