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Friday, 15 November 2013

Applications For Differential Pressure Gauges


What Differential Pressure Gauges do?


A Differential Pressure Gauges basically indicate the difference between two input connections.

Differential Pressure Gauge is just a visual indicator which is designed to measure and display the difference between two points. Differential Pressure Gauges have two inlet ports and each of them are connected to the pressure points. Differential pressure gauge just perform a mathematical operation of subtraction through mechanical means.

Differential Pressure Gauges are mostly used in industrial process systems and most of the times it is limited to a specific operation or it can be said that DP gauges functions are misunderstood. In fact, differential pressure gauges can provide multiple solutions to several problems.

Differential pressure is also written as DP or ∆p. Differential Pressure gauge is the difference between two applied pressures. 

For example:
Let
There are two points, Point “A” and Point “B”.
The pressure at point “A” is equal to 50psi and the pressure at point “B” is equal to 20psi. The differential pressure is 30psi.
Pressure at Point A = 50 Psi
Pressure at Point B = 20 Psi
So the Difference shown on the DP Gauge will be = 50 psi – 20 psi = 30 psi

Unit 
Pound per square inch (psi)
1 bar = 14.503773773022 psi

Some typical applications of differential pressure gauges are:

Liquid Level Monitoring


Sealed tanks have an atmospheric pressure gas blanket on the top. This blanket contain liquid. Thus the pressure of this gas blanket adds to the hydrostatic pressure which is created by water column of the content. This makes difficult for a pressure gauge to get accurate level measurement. Differential pressure gauge measures the difference in gas pressure from the total pressure and it is translated to a true liquid level reading.

Filter Monitoring


Differential pressure gauge can be used for filter monitoring. The Differential pressure gauge measures the pressure before and after the filter. As the filter gets more clogged with particles the differential pressure increases and when DP reaches up to the limit then the concerned operator knows that the filter should be changed.

Flow Monitoring


Differential pressure gauges can also be used to measure flow of a liquid in a pipe just by using an orifice plate.The differential pressure gauge measures pressure before and after the orifice. Thus the pressure drop across the orifice is later translated mechanically by the differential pressure gauge into the flow rate.  Differential pressure gauges are easy solution to measuring process flow.

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