Wika Hydrostatic Pressure Level measurement calibration and repair UAE
• Hydrostatic head is the weight of liquid above a reference or datum line, expressed in various units.
• The head is a real force due to liquid weight, exerted equally in all directions.
• A depth/height of liquid has a particular static pressure or head expressed by the relationship: P = p g h.
• A measurement of pressure P at a reference point in a vessel provides a measure of the height of the liquid above that point, provided the density or specific gravity of the liquid is known.
• Changes in the specific gravity of the liquid will affect liquid-level measurements by this method, unless corrections are made.
• When a pressure greater than atmospheric is imposed on the surface of the liquid in a closed vessel, this pressure adds to the pressure due to the hydrostatic head and must be compensated for by a pressure measuring device.