An article tells you the common advantages and disadvantages of flow meters and level gauges

When it comes to flow meters, thermometers, pressure gauges and liquid level gauges, we are all familiar with them. In order for us to correctly choose the product flow meter in the future, the editor has prepared a set of data for you. Which flowmeter products will speak as representatives: 1. Orifice flowmeter orifice flowmeter is a combination of standard orifice plate and multi-parameter differential pressure transmitter (or differential pressure transmission, temperature transmitter and pressure transmitter ) The matching high turndown ratio differential pressure flow device can measure the flow of gas, steam, liquid and natural gas. It is widely used in process control and measurement in petroleum, chemical, metallurgy, electric power, heating, water supply and other fields. Orifice flowmeter is widely used in coal, chemical industry, transportation, construction, textile, food, medicine, agriculture, environmental protection and people's daily life and other fields of the civil economy. It is the development of industrial and agricultural production, energy conservation and improvement of product quality. , an important tool to improve economic efficiency and management level occupies an important position in the national economy. In process automation instruments and devices, flow meters have two major functions: as a detection instrument for process automation control systems and a total meter for measuring the quantity of materials. Let's talk about the advantages first: 1. The standard throttle is fully used and has been approved by the international standards organization. It can be put into use without actual flow calibration, and it is also the only one in the flow sensor; 2. The structure is easy to copy. , simple, firm, stable and reliable performance, low price; 3, a wide range of applications, including all single-phase fluids (liquid, gas, steam), part of the mixed-phase flow, the diameter of the general production process, working conditions (temperature, pressure) are all It can be measured; 4. The detection parts and differential pressure display instruments can be produced by different manufacturers, so that they can be produced on a professional scale. Let’s talk about the disadvantages: 1. The repeatability and accuracy of the measurement are at a medium level in the flow sensor. Due to the intricate influence of many factors, the accuracy is difficult to improve; 2. The range is narrow, because the flow coefficient is related to the Reynolds number, the general range The degree is only 3:1 ~ 4:1; 3. There is a long straight pipe length requirement, which is generally difficult to meet. Especially for larger pipe diameters, the problem is more prominent; 4. The pressure loss is large; 5. The acute angle line of the inner hole of the orifice plate ensures the accuracy, so the sensor is sensitive to corrosion, wear, scaling, and dirt, and it is difficult to guarantee the long-term accuracy. Dismantle and check once a year; 6. Flange connection is used, which is prone to problems of running, running, dripping and leaking, which greatly increases the maintenance workload. 2. Vertical waist wheel flowmeter The waist wheel flowmeter is also called Roots flowmeter. Its structural features are: there is a measuring chamber in the casing of the flowmeter, and there are one or two pairs of waist wheels that can rotate tangentially in the measuring chamber. . A pair of transmission gears are installed coaxially with the two search wheels outside the casing of the flowmeter, and they mesh with each other so that the two waist wheels can be linked with each other. The waist wheel flowmeter can be used for flow measurement of various clean liquids, especially for oil measurement, and can also be made into a flowmeter for measuring gas. It has the highest accuracy of measurement, which can reach 0.1-0.5 level. As its unique feature: the product design of waist wheel flowmeter is novel and beautiful in appearance. It has the characteristics of light weight, high precision, easy installation and use. It is one of the typical products of positive displacement flowmeter. Its main disadvantages are: large volume, heavy weight, large pressure loss, large vibration during operation, etc. The use of two pairs of waist wheel structures with an angle of 45 degrees can greatly reduce the vibration and noise during operation. 3. Volumetric flowmeter Volumetric flowmeter, also known as fixed displacement flowmeter, referred to as PD flowmeter, is the most accurate type of flowmeter. It uses a mechanical measuring element to continuously divide the fluid into a single known volume portion, and measures the total volume of the fluid based on the number of times the measuring chamber is repeatedly filled and discharged. Positive displacement flowmeters can be classified into oval gear flowmeters, scraper flowmeters, dual rotor flowmeters, rotary piston flowmeters, reciprocating piston flowmeters, disc flowmeters, and liquid-sealed rotary drum flowmeters according to their measuring elements. , Wet gas meter and membrane gas meter, etc. Its advantages: 1. High measurement accuracy; 2. The installation pipeline conditions have no effect on the measurement accuracy; 3. It can be used for the measurement of high-viscosity liquids; 4. The range is wide; , total, clear and easy to operate. Let's take a look at his shortcomings: 1. The structure is complex and the volume is huge; 2. The type, diameter and working state of the medium to be measured are limited; 3. It is not suitable for high and low temperature occasions; 4. Most instruments are only suitable for Clean single-phase fluid; 5. Generate noise and vibration. Fourth, oval gear flowmeter Oval gear flowmeter (also known as displacement flowmeter, gear flowmeter) is a kind of positive displacement flowmeter, and it is a kind of high precision flowmeter. It uses mechanical measuring elements to continuously divide the fluid into a single known volume fraction, and measures the total flow volume based on the number of times the metering chamber fills and discharges the volume fraction sequentially and repeatedly. The oval gear flowmeter can be made of different materials (cast iron, cast steel, 304 stainless steel, 316 stainless steel), and it is especially suitable for flow measurement of high viscosity media such as heavy oil, polyvinyl alcohol, and resin.
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