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SWI L312E Series | Custom Multi-Level Float Switches For Small Tanks In Hazardous Locations

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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 L312E Series | Custom Multi-Level Float Switches For Small Tanks In Hazardous Locations


The vertically-mounted L312E Multi-Level Float Switch for Hazardous Locations is designed to monitor up to five levels on a single device. With only one entry, the L312E 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 various enclosures, 316 stainless steel floats and mounting types to suit most applications.

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 L312E Series


  • Modular Design
  • Probe Lengths Up to 4'
  • Up to 5 Switch Positions
  • 50 VA Switch (Standard)
  • Explosion-Proof Rating


  • UL & CUL: Recognized
  • FM:
    Class I, Div. 1, Groups A, B, C, D
    Class II, Groups E, F, G
    Class III, T4, Type 4

Mounting & Material Options

3/4" NPT 316 Stainless Steel SPST 50 VA No Enclosure
1" NPT Hastelloy SPST 100 VA Aluminum, 1/2" NPT
1-1/2" NPT SPDT 3 VA Small Cast, 3/4" NPT
2" NPT SPST 50 VA w/ Leadwire Large Cast, 1/2" NPT
3" NPT SPST 100 VA w/ Leadwire
4" NPT SPDT 3 VA w/ Leadwire
SAE-32 Thread SPST 50 VA w/ Terminal
1" BSP Thread SPST 100 VA w/ Terminal
2" #150 ANSI Flange SPDT 30 VA w/ Terminal
3" #150 ANSI Flange
3" #300 ANSI Flange

Float Size & Operating Specifications

316 Stainless Steel 1" x 1"  -40º to +300º F (-40º to +148.9º C) 300 PSIG (20.7 bar) 1.00
316 Stainless Steel 1.5" x 1"  -40º to +300º F (-40º to +148.9º C) 100 PSIG (6.9 bar) 0.69
316 Stainless Steel 1" Ball  -40º to +300º F (-40º to +148.9º C) 375 PSIG (25.9 bar) 0.84
316 Stainless Steel 0.90" x 1.5"  -40º to +300º F (-40º to +148.9º C) 200 PSIG (13.8 bar) 0.96
316 Stainless Steel 1" x 1.22"  -40º to +300º F (-40º to +148.9º C) 275 PSIG (19 bar) 0.86
316 Stainless Steel 1.61" x 1.1"  -40º to +300º F (-40º to +148.9º C) 120 PSIG (8.3 bar) 0.55
Teflon® 1" x 1"  -40º to +300º F (-40º to +148.9º C) 1,000 PSIG (68.9 bar) 0.60


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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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