Differential pressure measurement by WIKA
WIKA is a world leader in the manufacture and development of pressure measuring instruments. With WIKA you will also find the appropriate measuring instrument for the measurement of differential pressure.
As part of the WIKA portfolio, you will find differential pressure gauges, differential pressure sensors and differential pressure switches.
What is differential pressure?
The differential pressure is the pressure difference between two defined measuring points in a system. In addition to differential pressure, there are other types of pressure. Read more about the main types of pressure: absolute pressure, gauge pressure and differential pressure.
How does one calculate the differential pressure?
We need the pressure difference between the two pressures p1 and p2. This gives us the symbol for differential pressure, Δp, and the associated formula Δp = p1 - p2. In accordance with the international system of units, pressure has the unit pascal (Pa), while the measured variable of differential pressure is given in megapascals (mPA).
How does differential pressure measurement work?
For a differential pressure measurement, specialised instruments are used, such as differential pressure gauges, differential pressure sensors or differential pressure switches. The measurement requires the detection of two different values. A measurable difference only occurs if there is a corresponding gradient between the two measuring points. If the value at both points remains constant, no measurement of the difference occurs. A detected difference value indicates that the second point is either lower or higher than the value detected at the first point. A lower second value indicates a drop in pressure, while an increased second value indicates an increase.
In which applications is it important to measure differential pressure?
Differential pressure sensors measure the difference between the pressure at the inlet and the pressure at the outlet of a tool, a heat exchanger, a pump or a filter. Accordingly, the sensors are often used for level measurement in closed containers and also for filter or pump monitoring. Differential pressure measurement can therefore indicate a hole or break in the system or additional resistance from possible deposits, which can all quickly become dangerous for personnel and machinery. You can learn about more application areas for differential pressure measuring instruments in our blog posts “Safe filter monitoring with differential pressure gauges” and “Against overheating: Differential pressure gauges as flow monitors”.
Which differential pressure sensors does WIKA offer?
The WIKA model A2G-50 differential pressure sensor is used in ventilation and air-conditioning for the differential pressure measurement of gaseous media. It is used to monitor filters and to monitor overpressure in clean rooms and laboratories. The compact differential pressure sensor works on the piezoresistive measurement principle and delivers the highest level of performance and quality.
The model A2G-52 dual differential pressure sensor brings together two differential pressure sensors into a single measuring instrument, to enable the measurement of the pressure of two different control points.
What is the difference between a standard pressure gauge and a safety pattern version?
A safety version (code S3 per EN 837) has an additional solid baffle wall welded between the dial and the measuring system. In addition, the case has a back wall that can blow out completely. The window is typically made of laminated safety glass. ...
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Why is there some white foaming inside the case of liquid-filled pressure gauges?
With liquid-filled pressure gauges, white foam can occasionally form inside the case. This is the well-known phenomenon of an electrochemical reaction between aluminium components (e.g. pointers, dial) and the case filling (mainly with glycerine-wa ...
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