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Home Home Improvement Tools and Equipment Basic Tips On The Working Principles Of Pressure Sensors
Basic Tips On The Working Principles Of Pressure Sensors PDF Print E-mail
Written by Adriana Noton   
Pressure sensors are very popular in our times as they are the best systems for measuring pressure when it comes to fluid substances. When a container is full of liquid, for instance, and more liquid is released in the container, the sensor detects the increase in force and transforms it into an electric charge. After the transformation, the signal obtained will be transmitted further to the interpreter device. This is how equipment like this is functioning.
by AdrianaNoton


Pressure sensors are very popular in our times as they are the best systems for measuring pressure when it comes to fluid substances. When a container is full of liquid, for instance, and more liquid is released in the container, the sensor detects the increase in force and transforms it into an electric charge. After the transformation, the signal obtained will be transmitted further to the interpreter device. This is how equipment like this is functioning.

Not only the direct force can be calculated, but also other parameters will be obtained indirectly. This involves the level of fluid in the container, the speed of flowing and others. Any type of information can be provided by these readers. The measurement can be static and dynamic.

During the steam age the first devices were made and they became very popular. Since then, the technology has evolved a lot, and they have adapted. Their popularity is still the same in our times. They can be split in three categories depending on how they work: variable capacitance, strain gage and piezoelectric.

The pressure sensor can be found in different shapes and designs; they can be classified after performance or price, after the range of measurement and the temperature range of use. There are some dynamic sensors that can measure rapid changes in speed or pressure, these ones have a high performance and are made of quartz.

The construction of strain gages systems involves 2 things: a diaphragm and a strain gauge. The diaphragm is useful for the detection of the increasing force in the fluid. Then the information is passed to the strain gauge, which will generate a resistance equal to the force. The resistance can be measured with the aid of a DAQ or Data Acquisition System.

The variable capacitance modules have two metallic elements. The first element is a metal plate and the second is a metal diaphragm. The distance from the plate to the diaphragm determines the detection of any physical force. Like the accelerometer, devices of this construction are very stable; the only disadvantage is the resistance to high temperatures. It is also more difficult to assemble this type.

The piezoelectric systems have a construction layout that is based on quartz crystals. The quartz has a natural property which makes it create electrical charges at the detection of strong forces. The signal has to be boosted after it is generated. Their disadvantage is low resistance to vibrations and shocks.

The signal which is transmitted by the device is weak in the majority of cases. The measure unit is mV= 0,001 Volts. The voltage outputted depends on the force intensity. A voltage equal to zero means a pressure level that is zero (zero Bars). The signal does not exist in this case. But when the value is 5V the corresponding value will be 5 Bars.

Nowadays pressure sensors have a very high range of use, they are commonly used in the food industry, for example. With no exceptions, they have the role of measuring the forces made by the fluids. They are also able to detect the flow and the fluid level.

About the Author:

Choose from a wide selection of state-of-the-art scientific technologies including the linear position sensor, calibration systems, load cells, mass flow sensor, and accelerometer. These specialized tools are very popular among the research and development industries.

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