Introduction of flow measuring instrument classification

There are many kinds of flowmeters in industry, which are classified according to the state of the flow, and there are single-phase flow and multiphase flow. The classification of the principle of measurement can be divided into the following categories.

(1) volumetric flowmeter

Volumetric flowmeter is one of the first flowmeter, it is the use of fluid power meter parts turning itself, using a standard volume continuously in the instrument on the side of the medium for weighing, finally according to the number of standard volume measurement, to calculate the total volume of the medium flows through the flowmeter. It is mainly used for the volume of accumulative fluid. The measurement accuracy of this kind of instrument is very high, generally can reach the soil 0.5% or so, some even higher, and fluid density and viscosity change have little influence on the accuracy. However, due to the presence of rotating parts in the fluid, it is required that the medium be pure and free of mechanical impurities, so as to avoid wearing or jamming the rotor, so as to reduce the measuring accuracy or damage the instrument. There are ellipse gear flowmeter, lumbar wheel flow meter and so on.

(2) differential pressure flowmeter (throttling flowmeter)

Differential pressure flow meter is the use of the throttle device installed in the pipeline (e.g., orifice, nozzle, venturi tube, etc.), make the fluid flow, produce local contraction, form static pressure difference before and after the throttling device. The size of the pressure difference corresponds to the volume flow of flowing fluid, and the differential pressure value is measured by the differential pressure gauge, which is the indirect measurement of the flow value. Because of the simple structure, cheap price, convenient use and a few percent accuracy, this kind of flowmeter is the most widely used flowmeter. The differential pressure flowmeter is the flow meter and the rotor flowmeter.

(3) velocity flowmeter

The velocity flowmeter is the method of measuring the flow rate of the fluid by means of direct or indirect measurement of the average velocity of the fish. There are: target flowmeter, electromagnetic flowmeter, worm flowmeter, ultrasonic flowmeter, vortex flowmeter and cushion flowmeter.

The target flowmeter produced by fujian hengjin kebo measurement and control technology co., LTD. Is the speed flowmeter.

(4) mass flowmeter

Mass flowmeter is the measurement of the flow quality. At present, there are inertial force mass flowmeter belonging to this kind of flowmeter (which is a kind of direct type, there is also so-called compensatory type), and the derivation type mass flow is the most important. This kind of measurement method has the influence of the flow rate of the measured flow without the change of the flow, pressure, density and viscosity, etc., which is a kind of flow measurement method in development.

(5) other flowmeters

In addition to the above types of flowmeter, relevant flowmeter and laser doppler flowmeter are used to measure the flow of relevant technologies.