Working principle of the flowmeter

                                            Working principle of the flowmeter

Different working principle of the flowmeter is different.

Using time difference type ultrasonic flowmeter measurement principle: a probe signal through the wall, after medium, the other side of the wall, by another probe to receive, at the same time, the second probe emission signal is also the first probe to receive. Due to the influence of medium velocity, the lag in Δ t, according to the calculation can be concluded that the velocity V and the conversion relationship between the time difference Δ t V = (C2) / 2 l x Δ t, then can get the flow value Q.

The working principle of turbine flowmeter is the main species in the speed meter, when the flow sensor through the turbine flowmeter, the body under the action of fluid, force rotating impeller, its speed is proportional to the mean velocity of pipe, at the same time, the blade cutting electromagnet field lines, periodically change coil magnetic flux, according to the principle of electromagnetic induction, within the coil will sense the voltage signal of the pulse, the electric pulse signal, the electric pulse signal frequency and the flow rate is proportional to the current body.

Open channel flow meter works by using ultrasonic technology, by measuring the fluid level, through the instrument internal microprocessor operation flow. Due to the wrong contact measurement, open channel flow meter is applied in the harsh environment. Open channel flow meter under the microcomputer control, transmit and receive ultrasonic, open channel flow meter according to the transmission time calculated from the measured distance on the surface of the liquid, liquid level height is obtained, because the have certain proportion relation between liquid level and flow rate, thus can be obtained according to the formula for calculating the ultimate liquid flow rate Q.

English name is flowmeter of the flow meter, the national science and technology noun authorized committee to define it as: indicating measured flow and (or) in the selected time interval fluid volume meter. In simple terms is used to measure fluid flow in a pipe or channel of an instrument.

Commonly used in engineering unit m3 / h, it can be divided into the instantaneous Flow (Flow Rate) and Total Flow Rate (Total Flow), the instantaneous Flow Rate per unit of time closed pipes or the amount of open channel cross-section, Flow through the material can be gas, liquid and solid; Cumulative flow is in a certain period of time interval (day, week, month, year) fluid flows through the closed pipes or open channel section of the cumulative amount effectively. Cumulative flow can also be obtained through the integration of the transient flow of time, so the instantaneous flow and cumulative flow meter can be mutual conversion between.