Pressure Sensor Application

- Sep 15, 2017-

Pressure Sensor Application in Air Compressor 

and Piezoresistive Pressure Sensor

There are three basic types of air compressors: swing, rotary and centrifugal.Usually on this basis can also be subdivided. General industrial air compressor pressure in the size of 2hp to 10000hp. Air compressors are mainly used in pneumatic control, execution,spray equipment, pneumatic tools, air emissions and other applications.Our model QP-88 usually is used for air compressor(Please see the picture below).


The most common air compressors typically operate at 125pis (about 8.6 atmospheres) and have a gas flow rate of 1CFM to 15000CFM. When the air containing impurities or contaminants through the compressor, will greatly reduce the efficiency of air compressors,and reduce its useful life. To this end, the general manufacturer will install the separation / filtration equipment to remove the air in the stolen goods, water vapor and oil.

With the increase in the amount of contaminants adsorbed by the filtration equipment,the pressure drop after filtration will be increasing. Therefore,it is necessary to use a pressure sensor to monitor the pressure drop of the gas. When the pressure drop of the gas reaches 10pis, the pressure sensor can trigger the alarm system in the circuit in order to inform the operator to clean up or replace the filter device in time. As the pressure drop of the gas is affected by the use of the environment, Pressure Sensor the length of the filter used,the amount of filtered air and many other factors. Therefore, in the actual process is necessary to filter the equipment to clean up or replace, rather than just use the length of time.

The pressure sensitive element of the piezoresistive pressure sensor is a piezoresistive element which is based on the piezoresistive effect. The so-called piezoresistive element actually refers to the diffusion resistance of an integrated circuit process on the substrate of a semiconductor material, Pressure Sensor and its resistance changes due to the change in resistivity when it is subjected to external force.Diffusion resistance to work properly to be attached to the elastic components, commonly used is a single crystal silicon diaphragm.

The piezoresistive chip is housed in a housing with a fixed silicon cup structure. On a circular monocrystalline silicon diaphragm,four diffusion resistors are arranged,two in the compressive stress region, and the other two in the tensile stress region, which form a full bridge measurement circuit. The silicon diaphragm is fixed with a circular silicon cup with two pressure chambers on both sides, a high pressure chamber connected to the measured pressure, the other being a low pressure chamber, and a reference pressure, which is normally connected to the atmosphere. When there is pressure, the diaphragm deformation,so that the resistance of two pairs of resistance changes, the bridge out of balance, the output voltage reflects the pressure on both sides of the diaphragm to bear the size of the difference.

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