Application scope and comparison of 4 kinds of flow meters

The scope of application and comparison of the 4 types of flowmeters, let me let the editor take you to understand! Differential Pressure Flow Meters (DP) This is the most common flow technology and includes orifice plates, venturi tubes, and sonic nozzles. DP flow meters can be used to measure the flow rate of most liquids, gases and steam. DP flow meters have no moving parts, are versatile and easy to use. But after clogging, it will produce pressure loss and affect the accuracy. The accuracy of flow measurement depends on the accuracy of the pressure gauge. Including the detection parts are standard throttling device and uniform velocity tube, etc. It is a type of flowmeter with a long history of application, rich and mature practical experience, complete standards and specifications (except for the average velocity tube), and a complete range of specifications. It may be the only natural gas flowmeter before the 1950s. It has many deficiencies: such as general measurement accuracy, high requirements for on-site installation conditions, large pressure loss, narrow range, etc.; in response to the above deficiencies, domestic manufacturers have introduced a series of improvement methods in recent years, such as integrated differential pressure flowmeter, Fixed-value throttling parts, replaceable orifice throttling devices, standard nozzles, etc., plus two components of differential pressure flowmeters after the 1980s: differential pressure transmitters and flow display instruments have made outstanding progress. It is estimated that such flowmeters will still occupy an important position in the future. Positive Flow Meter (PD) A positive displacement flow meter is used to measure the volumetric flow rate of a liquid or gas, it introduces the fluid into the metering space and counts the number of revolutions. Impellers, gears, pistons or orifice plates are used to divide fluids. PD flow meters are highly accurate and are one of several methods of measuring viscous liquids. But it also introduces unrecoverable pressure errors and requires moving parts. Including waist wheel flowmeter, membrane flowmeter (household gas meter), etc. It is a natural gas flow meter with a long history and huge consumption, and has complete standard specifications. Moderate accuracy, wide range (150:1), suitable for small and medium flow ranges, direct reading, no external energy and straight pipe sections, etc. Let me talk about our commonly used membrane meter in particular: there is a flexible film inside, which can expand and contract with the entry and discharge of gas. A metering chamber is formed on both sides of each film. There is a slide valve above the metering chamber, which can make the metering chamber and the inlet and outlet of the gas meter alternately connected. When gas enters one metering chamber, the membrane expands, compressing its adjacent metering chamber, and expelling the gas. This repeated and alternating action is transmitted to the recording device through the mechanical structure, and the gas throughput is accumulated. Turbine Meters When fluid flows through a turbine meter, the fluid causes the rotor to spin. The rotational speed of the rotor is related to the speed of the fluid. The flow rate or total amount is derived from the average flow velocity of the fluid felt by the rotor. Like PD meters, turbine meters also have unrecoverable pressure errors and also require moving parts. In Europe and the United States, the turbine flowmeter is the second legal natural gas flowmeter after the orifice flowmeter. It has developed into a multi-variety, full-series, multi-specification, and mass-produced natural gas flowmeter. The standard specifications are also very complete, but there are also shortcomings: the cleanliness of the measuring medium is high, and the service life is limited. However, according to foreign departments, 240 flowmeters that have been used for 8 to 15 years have been periodically verified, and it is found that the deviation of the accuracy of the meters is still within the specified range. In addition, a high-efficiency rectifying rectifier and a turbine flow sensor are coupled to form a structurally integrated gas turbine flowmeter. Under the condition that the upstream side flow resistance is an elbow or a half-open stop valve, only 2D straight pipe length is required. It is a very prominent feature for urban installations with narrow installation spaces. When the conductive fluid of the electromagnetic flowmeter flows through the electromagnetic field, the velocity of the fluid can be obtained by measuring the voltage. Electromagnetic flow meters have no moving parts and are not affected by fluids. Measures conductive liquids with high accuracy when the pipe is full. Electromagnetic flowmeters can be used to measure the flow rate of slurry fluids. Measuring principle: Faraday's law of electromagnetic induction proves that a conductor moving in a magnetic field will induce an electric potential. Using the principle of electromagnetic measurement, the fluid is a conductor in motion. The induced potential is proportional to the flow velocity and is detected by two measuring electrodes, then the transmitter amplifies it and calculates the flow rate according to the cross-sectional area of ​​the pipe.

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