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SWI VLI2500 Series | Single Chamber Magnetic Float Visual Level Indicator

USA Toll Free: 1-800-730-0302 Tel: 416-240-1920 -

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 VLI2500 Series | Single Chamber Magnetic Float Visual Level Indicator


The VLI2500 Single Chamber Magnetic Visual Level Indicator is a practical alternative to fragile, easily-clouded sight glasses. Its electronic-free operation provides safe, durable and easy-to-read indication in various liquids while remaining isolated from potential media contamination. The visual level indicator's 2½” (63.5 mm) diameter 316 stainless steel chamber is capable of withstanding pressures up to 750 PSIG (51.7 bar) and its versatile design can integrate separate point level switch outputs for alarm and valve control functions. Various threaded, flanged and weld connections are available to mount the unit on the top, bottom or side of the tank. Further custom options include level switch and level transmitter integration as well as flag color combinations and graduated scales.

Principles of Operation

Within a non-magnetic chamber of the visual level indicator, a magnetic float rises and falls according to the fluid level. The float is designed to meet the specific gravity of the media and as it is carried by the fluid level, its internal magnets attract the external line of highly visible magnetic flags. Once the flags attract, they rotate and visibly track the exact measurement of the fluid.

SWI VLI2500 Series


  • High Contrast, Easy-to-Read Design
  • Fully-Isolated Visual Level Indicator and Pressure Chamber
  • Point-Level Switches Available
  • Durable, All 316 Stainless Steel Construction
  • Visibility Up to 100 Feet (30 Meters)
  • Top, Bottom or Side Mounting Connections
  • Optional Point Level SPDT (Latch) 25 Watt Maximum


  • Beverage Vessels & Tanks
  • Water & Storage Tanks
  • WFI Skids
  • DI Water Systems
  • Sanitary Mixing Tanks
  • Pharmaceutical & Biotech Vessels
  • HVAC
  • Sight Glass Replacement

Mounting Configurations

Type SS

Side to Side Mounting Connection

Type TS

Side & Top Mounting Connection

Type SB

Side & Bottom Mounting Connection
Type TB
Top & Bottom Mounting Connection

Side Connections


Fixed NPT Female

Fixed NPT Male

Fixed Blind Weld

Fixed Socket Weld

Fixed Sanitary Flange

Fixed Flange

Top & Bottom Connections


Fixed Sanitary Flange

Fixed Blind

Fixed NPT Female

Fixed NPT Male

Fixed Blind Weld

Fixed Socket Weld

Fixed Flange

Removable Sanitary Flange

Removable Blind

Removable NPT Female

Removable NPT Male

Removable Blind Weld

Removable Socket Weld

Removable Flange


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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.


Our Products

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.

Website Content

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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