Comparison of advantages of intelligent ultrasonic water meter
In the era of lack of social energy resources and increasing energy demand, the role of flow measurement in the national economy is becoming more and more obvious. In recent decades, with the rapid development of various communication technologies and new electronic devices, micro-power and high-energy power supplies, and with the increasing maturity of high-speed digital control chips, ultrasonic flow measurement technology has made great progress. . At present, there are many manufacturers at home and abroad that develop and produce ultrasonic water meters. It is believed that the application of ultrasonic water meters will become more and more extensive.
★ Comparison of the advantages of ultrasonic water meters
● Standard for modern flow measurement
Wide turndown ratio:
In order to reduce the leakage rate and improve the economic benefits, if the water meter is expected to have the ability to measure dripping water, this requires the measuring instrument to have a wide range ratio.
High parameter flow:
Flow measurement can also be performed for fluids with high parameters such as high temperature and low temperature. For example, the measurement of northern heating requires the measuring instrument to have the function of measuring the flow of hot water.
Low maintenance:
In order to ensure the continuous use of the measuring instrument, once a fault occurs, it can also be maintained online without affecting the reuse.
● Comparison between various water meters
From the birth of the flowmeter to the present, there are many kinds of flowmeters for different purposes developed according to different principles such as mechanics, heat, acoustics, electricity, optics, and atomic physics. Below are some of the most common water meters on the market.
◇Mechanical water meter uses a mechanical measuring element to continuously divide the fluid into a single known volume part, and measures the total volume of the flow according to the number of times the metering chamber fills and discharges the volume part of the fluid successively and repeatedly. Its main advantages are low cost and simple and easy to implement, and the price is cheap.
◇Electromagnetic water meter uses conductive liquid to generate induced potential when flowing in a non-magnetic measuring tube perpendicular to the magnetic field. The magnitude of the induced electromotive force is proportional to the average flow rate of the measured medium, so it is calculated according to the magnitude of the measured induced electromotive force The average flow rate of the measured medium can be obtained, so that the flow value can be calculated. Its main advantage is that there are no moving and blocking parts in the measured pipeline, and the pressure loss is small; since the induced electromotive force is only related to the average speed of the measured medium flow, and has nothing to do with its flow state, the electromagnetic water meter has high measurement accuracy and no mechanical Inertia, fast response, good dynamic characteristics.
◇The jet water meter is developed by using the Coanda effect. When the fluid in the closed pipe enters the jet metering chamber, the fluid oscillates in the metering chamber due to the existence of the jet Coanda effect and the jet feedback control effect. The flow rate is proportional to the average velocity of the fluid and thus the flow rate value is calculated. The jet water meter has high measurement sensitivity and can eliminate the influence of bubbles or tiny sediment in the measured liquid on the measurement results; it is mainly used for flow measurement of low Reynolds number fluids, with a wide measurement range, which has advantages in low flow detection.
◇Ultrasonic water meter uses the principle that ultrasonic waves carry fluid flow information when propagating in a flowing liquid. By detecting the ultrasonic signal passing through the fluid, the flow rate information of the measured fluid can be obtained, and finally converted into flow rate according to the corresponding principle. The ultrasonic water meter has no moving or blocking parts in the measured pipeline, no wear, and small pressure loss; high sensitivity, can detect small changes in flow rate; almost no requirements for the measured medium; has a very wide range ratio and ultrasonic water meter structure Simple and easy to maintain, ideal for civil and industrial measurements.