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Introduction to the development trend of electromagnetic flowmeter at home and abroad

I. Market evaluation
Foreign market
According to the network survey, in the past five years, the international economy is generally not prosperous, the average annual growth rate (CAGR) of the flow meter world market still reached 2.6%, and sales increased from 3.1 billion in 2002 to 3.5 billion in 2007. The US dollar, in which traditional instruments (throttle, volume, turbine, rotameter, etc.) were negative, with a CAGR of -2.2%, from $1.643 billion in 2002 (53% of total) to $1.505 billion in 2007 ( The annual growth rate of new instruments (electromagnetic, ultrasonic, Coriolis flowmeters, etc.) averaged 6.2%, from $1.457 billion in 2002 to $2.019 billion in 2007. The electromagnetic flux has a CAGR of less than 2%, because its base is large and the technology is mature.
According to the survey, turbine flowmeters are commonly used in many countries in the world to measure gas or liquids with low viscosity. Due to the rotating parts in the instrument, the maintenance workload is large. The CAGR of the past 5 years is -3.2%, and sales are from 2002. The $410 million fell to $348 million in 2007. Experts believe that the growth momentum of ultrasound in recent years is aggressive, but the turbine is much cheaper than ultrasonic, and has a price advantage. Compared with the throttle device, the turndown ratio can reach 10:1, and it is more accurate. In trade settlement, small and medium-sized customers still Happy to choose. The volumetric flow meter is a non-speed type instrument. The installation requires no straight pipe section, and the accuracy can generally reach ±0.5%, but it is more cumbersome. The caliber is generally less than 0.2m. Sales in the past five years have dropped from $520 million in 2002 to $452 million in 2007, with a CAGR of -2.7%. Experts believe that the new instrument replaces traditional instrumentation in many fields, which is a general development trend, but the process will be long.
2. Domestic market
According to statistics, in the domestic automated instrument market in 2005, the annual sales flow meter expressed 2.3 billion yuan; the pressure transmitter is about 1.8 billion yuan (of which about 500 million yuan differential pressure transmitter is matched with the differential pressure flowmeter) The temperature instrument is 1.2 billion yuan; the level and liquid level meter is 1 billion yuan. From the point of view of the type of flow meter, because the throttling device is relatively cumbersome and the technical content is relatively low, foreign manufacturers are basically not involved in the Chinese market of such products. The selection of such instruments in China's engineering is mainly based on domestic products, and the annual sales volume. Not less than 200,000 units, about 600 million yuan or more.
Ultrasonic has many advantages, not only accurate, but also small pressure loss. It is especially suitable for the trade measurement of precious fluids. It is more important at home and abroad. Only domestic exhibits are mostly liquid. Although there are several gas samples, they are used in the field. There are still some problems with trade settlement.
Second, the development trend
1. The structure is increasingly simple and light
Early electromagnetic flowmeters were purely mechanical on-site displays, such as volumetric flowmeters. Not only is the structure complicated and cumbersome, but the weight/caliber ratio is large; and the rotating parts therein are frequently repaired due to wear. With the increasing diameter of industrial pipelines, plug-in instruments are increasingly favored by users because of their simple structure, light weight, and easy assembly and disassembly. However, electromagnetic and ultrasonic flow meters have developed rapidly in the past decade, and there are no rotating parts in the pipeline. The resistance piece has a simple structure, small pressure loss and high accuracy, and is a flow meter with great development potential.
2. The function strives to be perfect and diverse
The early flow meters were displayed on the spot (such as volume and rotor). With the continuous improvement of the industrial level, dozens of instruments could not be adapted to the process requirements for centralized display, adjustment and control. It is necessary to separate the sensor (also called a table, such as an orifice plate, nozzle, inner cone) from the transmitter (also known as a secondary meter). The flow parameters are converted to electrical parameters and passed to the central control room. As the industrial scale expands, the analog signal can no longer be adapted, and the output signal needs to be converted into a digital signal to meet the requirements of the fieldbus system. In order to increase the reliability of the instrument, many instruments have added more than 10 kinds of self-diagnosis functions.

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