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All About Level Gauges

Level gauges are the simplest, most reliable way to determine the level of liquid in a tank or vessel, because they give you a direct view without compromising the integrity of your process system. Level gauges are installed so that the liquid level in the transparent sight tube is always the same as the liquid level inside the tank or vessel. Level gauges can be used at operating pressures up to 285 psi. For higher operating pressures, use level gauges

SIMPLE, RELIABLE, AND MAINTENANCE-FREE

Level gauges are simple: the only components (not including mounting hardware) are the armored shield, the sight tubing, and two self-sealing Super-Seal inserts. These products are maintenance-free, because only the Teflon Super-Seal inserts and the borosilicate sight tubing are exposed to process fluids. Once the gauges are installed, they do not have to be removed and disassembled for inspection or cleaning. Standard shields are epoxy-coated carbon steel.

SUPERSEAL INSERTS FOR PERMANENT, STRESS-FREE SEALING

Level gauges incorporate patented PTFE Teflon Super-Seal inserts, which seal on the outside diameter, not the ends, of the sight tube. Since Super-Seal inserts allow sight tube movement without leaking, stresses caused by differential expansion between the sight tube and the housing are eliminated. There are no elastomer seals or o-rings to inspect and replace: Super-Seal inserts last the life of the sight tubing.

LEVEL GAUGE QUALITY PROGRAM

Level gauges are quality ensured to exceed performance requirements with maintenance-free service. Systematic reviews of vendors, materials, processes, and product construction are consistently evaluated by management for improvement through technical innovation.

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Level Gauge with Magnetic Display

The level gauge model BNA consists of a bypass chamber, which, as a communicating tube, is connected laterally to a vessel via at least 2 process connections (flanged, threaded or welded). Through this type of arrangement of the level gauge, the level in the bypass chamber corresponds to the level in the vessel. The float with a built-in permanent magnetic system, which is mounted within the bypass chamber, transmits the liquid level, contact-free, to the magnetic display mounted to the outside of the bypass chamber. In this are fitted, at 10 mm intervals, two-coloured plastic rollers or stainless steel flaps with bar magnets.

Through the magnetic field of the permanent magnetic system in the float of the level gauge, the display elements, through the wall of the bypass chamber, are turned through 180°. For an increasing level from white to red; for a falling level from red to white.

Thus the level gauge clearly displays the level of a vessel without power supply.

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What is transparent level gauge?

Transparent level indicators are highly useful in chemical industries and petrochemical fertilizers. As the fluid is stored in high pressure and high temperature, the transparent level gauge is very useful to find the fluid level.

Working principle of the transparent level gauge

Apart from glass tube level gauges, transparent level gauges are always fitted with two plate transparent glasses between which the fluid is contained. The fluid level is indicated as the result of the different transparency of the two media and in some cases (for water steam), by conveying upwards on to the surface of separation (between liquid and gaseous substances) a source of light located at the back of the gauge, the rays of which are totally reflected down to the observer.

Applications

Transparent level gauges are suitable for almost all installations.

In fact they permit:

  • the use of mica shields or Polytrifluorochloroethylene shields to protect the glass from the corrosive action of the process fluid.
  • the observation of interface.
  • the observation of the liquid colour.

This instrument consists of a metal body, machined to have an internal chamber and one or more front windows (on each side of the gauge). On each window a special high resistance plate transparent glass is applied with sealing joint and metal cover plate hold by bolts and nuts.

The chamber of the transparent level gauge is connected to vessel with cross fittings and flanged, threaded or welded ends. Usually, between the instrument and its connecting ends, valves are fitted to consent shut-off piping and to disassemble the level gauge without to empty the vessel. Drain valves can also be fitted to cross fittings device.

To avoid leakage in case of glass breakage, safety ball-check device can be provided in cross-fittings or shut-off valves in the transparent level gauge. This kind of indicator is suitable for water/steam. To protect glass surfaces from corrosive action of the process fluid, Transparent Level Gauges can be fitted with Mica shields or Polytrifluorochloroethilene shields. This kind of indicator is suitable for liquids colorless and very fluid.

Level Gauge

In some case (i.e. for water/steam) the best reading is obtained by conveying upwards on the surface of separation (liquid/steam or vapor interface), a source of light, located on the back of the gauge, the rays of which are totally reflected down to the observer.

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