Working principle of Turck flow sensor
Abstract: Turck flow sensors are mainly used in manufacturing. Turck FTCI series flow sensors can display the current flow rate, and the performance is stable, but the thermal conductivity of different media is different. It is usually only suitable for water or a mixture of ethylene glycol.
To ensure trouble-free testing and reliability of test results in the manufacturing industry, many processes require consistent inflow and outflow of liquid or gaseous media. In the automated production process, in addition to pressure and temperature, flow measurement is also very important. According to the requirements for continuous monitoring or limit monitoring of the flow rate, the output signal of the flow sensor can be selected as the analog quantity or switching value corresponding to the current flow rate. Each application has special requirements for flow sensors.
Turck flow sensors are mainly used in manufacturing.
Various measuring principles
Different physical principles of electronic or mechanical flow monitoring have their own advantageous measurement methods. If the flow rate of the medium is different according to the principle of heat conduction, the heat generated is different.
Online sensors determine the flow rate based on the cross section of the known pipe-first detect the flow rate, and then calculate the flow rate based on the flow rate. Turck FTCI series flow sensors can display the current flow rate, and the performance is stable, but the thermal conductivity of different media is different. It is usually only suitable for water or a mixture of ethylene glycol.
Mass flow meters for liquid and gas flow detection based on Cleoli principles are expensive. When the medium flows through the elbow, the mass flow meter causes it to oscillate, and measures the resulting Cleoli force. The advantages of mass flow meters are high measurement accuracy, dynamic measurement range, low pressure loss, and are suitable for both gas and liquid.
There are two main methods for ultrasonic flow measurement: Doppler method, that is, the use of medium reflection sound waves to change the frequency, and the frequency difference between the sound source and the medium receiving the sound wave when moving. The running time method, that is, the speed of sound superimposed on the medium, if the direction of the ultrasonic wave is consistent with the water flow, the running time is short, otherwise the running time is long, and the flow rate can be calculated from the running time difference.
Another important principle is the vortex frequency method, also known as the vortex street principle, that is, a Kaman vortex street is formed by placing a choking fluid in the fluid, and a regular vortex is formed on both sides of the choking fluid under a certain flow rate. Turck FCVI vortex flowmeter can sensitively sense the change of medium pressure and temperature, so it is very suitable for process and cold water circuit control, especially for water monitoring.
Differential pressure method is based on Bernoulli principle-the intersection of the pipeline is narrow, forming a nozzle. Because the flow rate is the same in any position in the pipeline system, a pressure drop is formed, and the flow rate can be calculated according to Bernoulli principle.
The flowmeter based on electromagnetic induction principle for flow monitoring is suitable for detecting all conductive liquids with conductivity greater than 15μ S / CM. In the magnetic field, the moving charged particles generate a voltage, whose size is proportional to the average flow rate of the medium. The measurement accuracy of the FCMI electromagnetic flowmeter is 2% of the measured value. There are no mechanically moving parts in the fluid. Small diameter, so there will be no pressure loss.