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SWI L312 Series | Custom Multi-Level Float Switches For Small Tanks

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Sensors and Switches are mechanical-type sensing devices that do not require power to operate. Engineered based on time-proven principles such as buoyancy, conductivity, magnetic latching, capacitance and more, SWI sensors and switches are manufactured to provide reliable industrial process measurement year after year. Click on a sensing device below to learn more about our available sensors and switches product line.

SWI L312 Series | Custom Multi-Level Float Switches For Small Tanks


The vertically-mounted L312 Multi-Level Float Switch is designed to monitor up to five levels on a single device. With only one entry, the L312 can track changing levels within a small tank, as well as monitor liquid interfaces of dissimilar liquids for oil/water separations, chemical emulsions and condensation levels. Probe lengths are available up to 4' with numerous combinations of floats, mounts, enclosures and materials to suit every application.

Principles of Operation

The switching action is achieved through the use of an internal magnet within the float assembly and its interaction with the switch mechanism. As the liquid level fluctuates inside the tank, the float moves. Its magnetic field actuates each reed switch inside the stem and completes an electrical circuit.

SWI L312 Series


  • Economical & Versatile
  • Probe Lengths Up to 4'
  • Capable of Up to 5 Switch Positions
  • 50 VA Switch (Standard)
  • Adjustable Probe Model Options
  • Over 360 Combinations to Customize

Mounting & Material Options

No Mounting Brass SPST 20 VA No Enclosure
1/8" NPT Polypropylene SPST 50 VA Polypropylene NEMA 4
1/4" NPT PVC SPST 100 VA Cast Aluminum NEMA 4/7/9
3/8" NPT 316 Stainless Steel SPDT 3 VA Cast Iron NEMA 4/7/9
1/2" NPT Teflon® (PFA)
3/4" NPT Polysulfone
1" NPT
1-1/4" NPT
1-1/2" NPT
2" NPT

Float Size & Operating Specifications

Polypropylene (Hollow) 1" x 1"  -40º to +150º F 50 PSIG 0.66
Polypropylene (Solid) 1" x 1"  -40º to +150º F 150 PSIG 0.87
PVC 1" x 1"  -40º to +150º F 50 PSIG 1.00
316 SS 1" x 1"  -40º to +300º F 300 PSIG 1.00
316 SS 1.5" x 1"  -40º to +300º F 100 PSIG 0.69
316 SS 1" Ball  -40º to +300º F 375 PSIG 0.84
316 SS 0.90" x 1.5"  -40º to +300º F 200 PSIG 0.96
Teflon (PFA) 0.90" x 1.1"  -40º to +300º F 1,000 PSIG 0.60
Teflon PFTA (Hollow) 1.125" x 1.250"  -40º to +212º F 25 PSIG 0.95
Buna-N 1" x 1"  -40º to +180º F 150 PSIG 0.63
Polysulfone (Hollow) 1" x 1"  -40º to +250º F 50 PSIG 0.95


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About Us

Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


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Dataloggers, sensors, pumps, recorders, hand held instruments, flow instrumentation, level controls, valves, instrumentation, containers, tanks, transmitters, data loggers, digital indicators, mixers and agitators, pressure intrumentation, analyzers and controllers for a variety of industrial applications such as water quality, pH/ORP and more.

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Water Analyzers and Controllers, Wireless Products, Corrosion Monitoring Equipment, Cooling Tower and Boiler Controllers, a wide variety of Pumps, Valves, Dataloggers and Recorders, HVAC, Instrumentation, Skids and Systems, Containers and Tanks from world leading manufacturers are products you will find on this site.

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