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Classification of target flowmeters and how they work
Aug 09, 2018

Classification of target flowmeters and how they work

The target flowmeter first appeared in the 1960s and was originally used to solve the flow measurement problem of high viscosity, low Reynolds number fluids. With the rapid development of electronic technology and the emergence of new sensor technologies, target flowmeters have made great progress in measurement accuracy, anti-interference, sealing reliability, calibration and debugging, etc., and have regained market recognition and become flow measurement. Common equipment.

The principle of measuring the target flowmeter is to set a circular plate called a target in the direction of the cross section of the cylindrical straight pipe section of constant section and the direction perpendicular to the flow beam. When the fluid flows around the target, the target is subjected to thrust, and the force is The kinetic energy of the fluid is proportional to the area of the target. When the Reynolds number of the pipeline is greater than the Reynolds number of the flowmeter, the flow has a certain numerical correspondence with the force received by the target.

Shaft Seal Diaphragm Pneumatic Target Flowmeter Shaft Seal Diaphragm Pneumatic Flowmeter is a force-pneumatic converter type flowmeter. The working process is: the lever rotates around the shaft seal diaphragm under the action of the target force, changes the air outlet gap of the nozzle, thereby changing the input pressure of the pneumatic amplifying unit, and finally changing the output pressure, so that the output pressure changes with the change of the target force. . This structural flowmeter appeared earlier, but is now rarely used.

Shaft seal diaphragm displacement target flowmeter shaft seal diaphragm displacement target flowmeter is a force-displacement-voltage conversion type flowmeter, the working process is: the lever rotates around the shaft seal diaphragm under the action of the target force The vector mechanism drives the iron core in the differential transformer to move, and changes the output voltage of the differential transformer. After the voltage is sent to the electrical unit, the current signal related to the flow rate is output.

Shaft seal diaphragm strain target flowmeter shaft seal diaphragm strain target flowmeter is a force-strain-voltage conversion type flowmeter, the working process is: the target force is transmitted through the lever (shaft seal diaphragm as the fulcrum) To the elastomer, a bending moment acts on the elastomer, causing the elastic body to bend and deform, causing the bridge composed of four strain gauges to be out of balance, producing an output, which is processed by the electrical unit to output a current signal related to the flow rate.

Flexible Tube Target Flowmeter Flexible Tube Target Flowmeter is also a force-strain-voltage conversion type flowmeter. Its working process is: the target force is transmitted to the flexible pipe through the lever, and the flexible pipe is bent. The moment acts to cause bending deformation of the flexible tube, causing the bridge composed of four strain gauges to be out of balance, producing an output that is processed by the electrical unit to output a current signal related to the flow rate.

Torque tube target flowmeter Torque tube target flowmeter is also a force-strain-voltage conversion type flowmeter. Its working process is: the target force is transmitted to the torque tube through the lever, which generates a torque effect on the torque tube and causes the torque. The tube is twisted and deformed, causing the bridge composed of four torque strain gauges to be out of balance, producing an output that is processed by the electrical unit to output a current signal related to the flow.

The measurement principle of the differential pressure target flowmeter differential pressure target flowmeter is quite different from that of other target flowmeters. It measures the fluid flow by measuring the pressure difference between the upstream and downstream of the target. The differential pressure target flowmeter is a new concept flow measuring instrument, which combines the advantages of the throttling device and the target flowmeter, overcomes their respective shortcomings, has clear theory, simple structure, convenient installation and maintenance, and high measurement accuracy. With reliable performance and other advantages, it will definitely provide better services for the flow measurement industry.


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