Pressure Measurement & Control


Hydrostatic pressure transmitters

July 2005 Pressure Measurement & Control

The brewing and dairy industries have seen many changes in recent years. Increased demands on productivity, manpower and more competition requires companies to invest in automation and improvements to operational systems. Rationalisation of staffing levels mean fewer engineers with less time for breakdowns, repairs and re-calibration of automated systems.

Food and beverage manufacturing environments are amongst the most demanding for instrumentation. Temperature cycles, high humidity, condensation, manual high pressure cleaning (both inside and outside vessels) and automated CIP (clean in place), combined with a range of detergents and chemicals, provide some of the most arduous operating conditions.

Hydrostatic pressure transmitters provide a precise measuring principle, as they are unaffected by the conductivity or the dielectric constant of the product and by foam generation at high product temperatures.

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 1 kPa (10 millibar), nominally 100 mm 'hydrostatic head'.

Hydrostatic level uses the weight of the liquid to calculate level - a hydrostatic head pressure is generated proportionally to the depth of liquid and this pressure is used to determine the level that gave rise to this pressure.

In small vessels the pressure exerted on a transmitter can be very low, producing a correspondingly small deflection of the measuring diaphragm - unless one makes use of 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 10 kPa (100 millibar).

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.

Also available is the Vegawell 72, a suspension pressure transmitter suitable for applications such as deep wells, gauge measurements and ballast tanks.

For more information contact Alan Wynn, Vega Instruments, 011 958 1901, alan.wynn@za.vega.com, www.vega.com



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