What are the types of gas flowmeters and how to choose?

There are several types of flowmeters, how to choose a flowmeter, the following is a detailed introduction: the types of flowmeters, the selection of flowmeters, the price of flowmeters, the principle of flowmeters, the installation of flowmeters, and the manufacturers of flowmeters are issues that users have always paid close attention to. . Flow is a dynamic quantity. Its measurement process is related to the fluid flow state, the physical properties of the fluid, the working conditions of the fluid, and the length of the straight pipe section before and after the flowmeter. Therefore, to determine the flow measurement method and select the flow meter, the influence of the above factors must be considered comprehensively. Only in this way can the ideal measurement requirements be achieved. The gas flowmeters commonly used in automatic instruments are divided into the following categories: 1. Velocity flowmeter, the velocity flowmeter is an instrument that measures the flow by measuring the average velocity u of the flow in the pipeline. Since there are many ways to measure the speed, the speed flowmeter has many different measurement principles according to the different physical quantities to be measured. 2. The differential pressure flowmeter is to calculate the differential pressure flow meter by installing the differential pressure generated by the flow detection element in the industrial pipeline, and calculating the differential pressure flow rate with the known fluid conditions and the geometric dimensions of the detection element and the pipeline. The differential pressure flowmeter is composed of primary detection parts and secondary instruments (differential pressure converter or transmitter and flow display instrument). Differential pressure flowmeters are classified in the form of detection parts, including orifice plate flowmeters, Venturi flowmeters, and uniform velocity tube flowmeters. The secondary instruments are all kinds of mechanical, electronic, electromechanical integrated differential pressure flowmeters, differential pressure transmitters and flow display instruments. Differential pressure flow meter is one of the most widely used flow meters in the flow meter family. At present, it has been serialized, generalized and standardized at home and abroad. Differential pressure flow meter can measure flow parameters alone and other parameters (pressure , level, density), etc. The detection parts of the differential pressure flowmeter can be divided into several categories according to their working principles: throttling device, hydraulic resistance, dynamic pressure head type, dynamic pressure head gain and jet type, and centrifugal type. There are two types of test pieces, standardized or non-standard. The standard detection element is designed, manufactured, installed and used according to standard documents, and its flow value and measurement error can be determined without actual flow calibration. Non-standard detection elements are generally not included in the detection elements of international standards. Differential pressure flowmeter is also a kind of flow meter widely used, occupying a large part of the usage of various flowmeters. The main advantages are: (1) The most widely used orifice flowmeter has a firm structure, stable and reliable performance, and a long service life; (2) It has a wide range of applications, and so far there is no comparable flowmeter; The transmitters and display instruments are produced by different manufacturers, which is convenient for scale economy production. The main disadvantages are: (1) The measurement accuracy is generally low: (2) The range is narrow, generally only 3:1 to 4:1; (3) The installation conditions on site are high; (4) The pressure loss is large (referring to the orifice plate, nozzles, etc.). 3. Volumetric flowmeter Volumetric flowmeter, also known as constant displacement flowmeter, or PD flowmeter for short, is the most accurate type of flow meter. It uses mechanical measuring elements to continuously divide the fluid into a single known volume, and measures the total volume of the fluid according to the number of times the measuring chamber is filled and discharged with the volume of fluid. Volumetric flowmeters are classified according to their measuring components: oval gear flowmeters, rotary piston flowmeters, reciprocating piston flowmeters, disc flowmeters, wet gas meters, capsule gas meters, liquid-sealed drum flowmeters, etc. Main advantages: (1) High measurement accuracy; (2) Installation pipeline conditions have no effect on measurement accuracy; (3) Can be used for the measurement of high-viscosity liquids; (4) Wide range; (5) Direct-reading instruments do not require external energy Accumulation and total amount can be obtained directly, which is clear and easy to operate. the

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