Theory of Operation
An appeal of visual level indicators (VLI's) is their ability to monitor the level within a vessel while still maintaining the process inside a sealed chamber. A wide variety of mounting configurations are available to ensure both a safe and easy installation. VLI's eliminate the hazards and leakage of sight glasses. With optional switch and transmitter attachments, VLI's are also less expensive than a system of sight glasses, alarm switches and transmitters - all separately piped to the vessel.
A float with internal magnets moves within the VLI chamber. As the liquid rises and falls within the process tank, the float travels with the corresponding fluid level inside the chamber. An isolated visual indicator housing is attached to the exterior containing a string of dual color magnetic flags that rotate as the float passes. The point at which the flag color has changed on the indicator directly correlates to the liquid level within the process tank.
VLIT models combine the conventional float-based operation of the VLI with electrical level-sensing devices. Housed within a second chamber, a capacitance transmitter or guided wave radar transmitter provide outputs in relation to the fluid level.
add_circle Related Products
L505 SeriesDip-Tape Magnetic Float Visual Level Indicator
VLI2500 SeriesSingle Chamber Magnetic Float Visual Level Indicator
VLIT2500 SeriesDual Chamber Magnetic Float & Transmitter Visual Level Indicator
settings Industry Applications
|Beverage Vessels & Tanks|
|Water & Wastewater|