What are the main categories of flow meters

Abstract: What are the main classification information of flow meters are provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. Instruments that measure fluid flow are collectively referred to as flow meters or flow meters. Flowmeter is one of the most important instruments in industrial measurement. With the development of industrial production, the requirements for the accuracy and range of flow measurement are getting higher and higher, and the flow measurement technology is changing with each passing day. for. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the main classification articles of flowmeters. Instruments that measure fluid flow are collectively referred to as flow meters or flow meters. Flowmeter is one of the most important instruments in industrial measurement. With the development of industrial production, the requirements for the accuracy and range of flow measurement are getting higher and higher, and the flow measurement technology is changing with each passing day. In order to adapt to various uses, various types of flowmeters have come out one after another. At present, there are more than 100 kinds of flowmeters that have been put into use. From different perspectives, flow meters have different classification methods. There are two commonly used classification methods, one is to classify according to the measurement principle adopted by the flowmeter; the other is to classify according to the structural principle of the flowmeter. 1. Classification by measurement principle (1) Mechanical principle: Instruments belonging to this type of principle include differential pressure type and rotor type using Bernoulli's theorem; impulse type and movable tube type using the momentum theorem; Direct mass type; target type using the principle of fluid momentum; turbine type using angular momentum theorem; vortex type and vortex street type using the principle of fluid oscillation; Pitot tube type using total static pressure difference, volume type, weir, groove, etc. Wait. (2) Electrical principle: The instruments used for this principle include electromagnetic, differential capacitive, inductive, strain resistance and so on. (3) Acoustic principle: There are ultrasonic methods for flow measurement using the acoustic principle. Acoustic type (shock wave type), etc. (4) Thermal principle: There are thermal type, direct thermal type, indirect thermal type, etc. that use thermal principle to measure flow. (5) Optical principle: Laser type, photoelectric type, etc. are instruments that belong to this type of principle. (6) Originally from physical principles: nuclear magnetic resonance, nuclear radiation, etc. are instruments that belong to such principles. (7) Other principles: there are marking principles (tracer principle, nuclear magnetic resonance principle), related principles, etc. 2. Classification according to the structural principle of the flowmeter According to the actual situation of the current flowmeter products, according to the structural principle of the flowmeter, it can be roughly classified into the following types: 1. Positive displacement flowmeter The positive displacement flowmeter is equivalent to a container of standard volume, which continuously measures the flowing medium. The larger the flow, the more times the measurement is performed, and the higher the frequency of the output. The principle of positive displacement flowmeter is relatively simple, and it is suitable for measuring fluids with high viscosity and low Reynolds number. According to the shape of the rotating body, the products currently produced are divided into: oval gear flowmeters, waist wheel flowmeters (Roots flowmeters), rotary piston and scraper flowmeters suitable for measuring liquid flow; servo-type flowmeters suitable for measuring gas flow Volumetric flowmeter, membrane type and rotary flowmeter, etc. 2. Impeller flowmeter The working principle of the impeller flowmeter is to place the impeller in the measured fluid, and rotate under the impact of the fluid flow, and the flow rate is reflected by the speed of the impeller rotation. Typical impeller flowmeters are water meters and turbine flowmeters, and their structures can be mechanical transmission output type or electrical pulse output type. Generally, the water meter output by mechanical transmission has low accuracy, and the error is about±2%, but the structure is simple and the cost is low. It has been mass-produced in China and is standardized, generalized and serialized. The accuracy of the turbine flowmeter output by the electrical pulse signal is relatively high, and the general error is±0.2% to 0.5%. 3. Differential pressure flowmeter (variable pressure drop flowmeter) Differential pressure flowmeter consists of a primary device and a secondary device. The primary device is called a flow measuring element, which is installed in the pipeline of the measured fluid to generate a pressure difference proportional to the flow rate (velocity) for the secondary device to display the flow. The secondary device is called display instrument. It receives the differential pressure signal generated by the measuring element and converts it into the corresponding flow for display. The primary device of the differential pressure flowmeter is often a throttling device or a dynamic pressure measuring device (pitot tube, uniform velocity tube, etc.). The secondary device is a variety of mechanical, electronic and combined differential pressure gauges with flow display instruments. Differential pressure sensitive elements of differential pressure gauges are mostly elastic elements. Since the differential pressure and flow are in a square root relationship, the flow display instruments are equipped with a square root device to linearize the flow scale. Most instruments are also equipped with a flow accumulating device to display the accumulated flow for economical accounting. This method of measuring flow using differential pressure has a long history and is relatively mature. It is generally used in more important occasions around the world, accounting for about 70% of various flow measurement methods. This kind of meter is used in the flow measurement of main steam, feed water, condensate, etc. in power plants. 4. The float of the variable area flowmeter (equal pressure drop flowmeter) placed in the upper and lower conical flow channels is moved by the force of the fluid flowing from the bottom to the top.

Beijing Sincerity Automatic Equipment Co., Ltd has created a professional team which contained with a numbers of engineers and technology experts.

Many websites provide additional information on the topic of mass flow meter. One such site worth visiting is Sincerity Flow Meter.

mass flow meter can also provide a new, productive option for business owners, if you're willing to use it.

Beijing Sincerity Automatic Equipment Co., Ltd harnesses science and technology to create products that support safer and healthier living and that enhance the overall quality of life.