Vega has been producing hydrostatic pressure transmitters for over 30 years. They are accurate, even when measuring in small vessels exerting low pressures. The lowest ranges reliably and accurately measured by Vega are 0 to 10 mbar (1 kPa), nominally 100 mm 'hydrostatic head'.
Hydrostatic transmitters use the weight of the liquid to calculate level - a hydrostatic head pressure is generated proportionally to the height of liquid and this determines the level.
In small vessels the pressure exerted on a transmitter can be very low and so is the deflection of it, unless you have a very large diaphragm area. Transmitters can be required to measure very low pressures - for example, the pressure of a 1 m high vessel filled with water is only approximately 100 mbar (10 kPa).
The VEGABAR series 60 pressure transmitters are developed for level as well as pressure measurement applications. In particular the VEGABAR 64 with its CERTEC measuring cell made of sapphire ceramic offers a gap-free surface and is suited for flush mounting into pipelines and vessels. This makes it suitable for applications in the food industry where conditions such as high temperatures, foam generation and caustic agents used for CIP are present.
For more information contact John Groom, Vega Instruments SA, +27 (0)11 958 1901, [email protected]
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