1. Characteristics of turbine flowmeter:

1) High accuracy, generally ±0.25%R-±0.5%R for liquids, high-precision type can reach ±0.15% R; while the medium is gas, it is generally ±1%R-±1.5%R, and the special type is ±0.5%R-±1%R. It is the most accurate of all flow meters.

2) Good repeatability, short-term repeatability can reach 0.05%-0.2%. It is precisely because of the good repeatability, such as frequent calibration or online calibration, that extremely high accuracy can be achieved in trade settlement. is the preferred flow meter. ?

3) Output pulse frequency signal, suitable for total measurement and connection with computer, no zero drift, and strong anti-interference ability. ?

4) It can obtain very high frequency signals (3-4kHz) and has strong signal resolution. ?

5) The range is wide, the medium and large diameters can reach 40:1-10:1, and the small diameters are 6:1 or 5:1. ?

6) Compact and lightweight structure, easy installation and maintenance, and large circulation capacity. ?

7) It is suitable for high-pressure measurement. There is no need to open holes on the instrument body, and it is easy to make a high-pressure instrument. ?

2. Working principle of turbine flow meter:

When the fluid flows along the axis of the pipe and impacts the turbine blades, there will be a relationship between the flow rate qv, the flow velocity V and the fluid flow rate. A force proportional to the product of density ρ acts on the blades, pushing the turbine to rotate. As the turbine rotates, the blades periodically cut the lines of magnetic force produced by the electromagnet, changing the magnetic flux in the coil. According to the principle of electromagnetic induction, a pulsating potential signal will be induced in the coil, and the frequency of this pulsating signal is proportional to the flow rate of the fluid being measured. Among them, qv is the total volume of fluid, N is the total number of pulsations generated by the flow sensor; ξ is the flow coefficient.

The important characteristic parameters of the turbine flowmeter sensor are different for different instruments and change with the wear and tear of the instrument for a long time; its meaning is the output of the flow sensor when the unit volume flow passes through the flow sensor. number of pulses. ?

The pulse signal output by the turbine flowmeter sensor is amplified by the pre-amplifier and sent to the display instrument, so that the flow rate can be measured.

3. Turbine flowmeter is suitable for:

Liquid flow measurement in petroleum, chemical, light industry, food and other industries.