There are many different systems used in vehicles, industrial applications and in processing that require the use of accurate pressure measurement. One of the most common measurements required is differential pressure.
There are several different types of devices that are ideal for differential pressure measurement depending on the specific requirements. Selecting the correct device is essential to provide the right range of measurements as well as to function correctly in the given environment.
These indicators are designed, as the name suggests, to measure the different between two different areas of pressure. They are often used at specific points in a system to measure the difference in pressure at key locations. Some are designed to have a visual readout while others may be connected directly to computers to keep a continuous report in a database or through some type of control or management software.
The Advantage
The advantage to using a differential pressure measurement device is that it provides a single measurement. Without this, the operator or the user would have to measure the pressure at two points and then complete the comparison to determine if there is a pressure difference and what that difference is.
The device will include two different ports that allow the fluid to enter into either side of the differential pressure measurement device. It can also be designed for liquid level monitoring or to detect liquid flow. As it does detect a pressure change they can also be used in a system to detect the efficiency of a filtration system. By detecting a drop in the liquid flow on the inside of the filter compared to the intake side the quality and efficiency of the filter can be easily monitored.
Differences in Devices
With so many different applications for differential pressure recording, there is a need for several different design options. Some of the most common include:
* Dual diaphragm – these are often used in high pressure lines where low differences in pressure have to be monitored.
* Piston – these are often used in the petrochemical industry or in processes where a flow-by system can be used with the gauge. Some also have a diaphragm but all styles are designed for very long working life.
* Corrosion resistance – the all-welded types of gauges are the ideal option in many types of chemical process plants or in vehicle engines. With resistance to corrosion, these can be used in the most challenging conditions and function for years.
Taking the time to compare different differential pressure gauges before making a decision. Check for any specific use requirements or conditions that may make one design or device a better option over others.
