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The technical status and development direction of remote water meter

(Summary description)1. The status quo and development of impulse remote water meter First of all, two of the impulse sensing methods have been basically eliminated from the meter reading field, they are photoelectric sensing method and Hall sensing method.

The technical status and development direction of remote water meter

(Summary description)1. The status quo and development of impulse remote water meter First of all, two of the impulse sensing methods have been basically eliminated from the meter reading field, they are photoelectric sensing method and Hall sensing method.

Information

1. Current status and development of pulsed remote water meter First of all, two of the pulse sensing methods have been basically eliminated from the meter reading field, they are photoelectric sensing method and Hall sensing method. The reason why it tends to be eliminated is because:

1. Compared with other contact sensing methods such as dry reed switch, it has the disadvantage of power consumption, which makes it impossible to use in some occasions that require low power consumption.

2. The shortcomings of false signalling of critical point flutter cannot be overcome.

3. Inconvenience and failure caused by external power supply. Of course, the Hall sensing method has undergone more than ten years of renewal and improvement. If there is no better method, it may be retained. However, compared with the self-holding switch, the Hall sensing method is more reliable. , Accuracy, micro power consumption, and low cost are not dominant, which makes the Hall sensor method lose the last space. In contrast, the awkwardness and defects of the photoelectric sensing method are not to mention, and the sound that is still in use has hardly been heard for more than a year. The sensing method of a single dry reed pipe is already "notorious", and its disadvantage is that it cannot solve the problems of excessive counting when the contact is vibrating and insensitive induction and less counting. Almost all of these products used in the field in the past few years have been abandoned or replaced. But in the case of some people who are not very knowledgeable and do not pursue accuracy, there are still people who use it. Compared with the single reed pipe, the double reed pipe has a significant improvement. The author made this invention (a high-precision water meter patent number: 99206865) is described in detail. In actual use, the sensitivity of the double dry reed tube is limited, and there will be problems in which the magnetic force is weak and the data is discarded, and the magnetic force is strong at the same time. In addition, the collector detects two switches, which requires an additional interface. If short circuits, open circuits, etc. are also detected like other remote meters, it will be more complicated. In the article "The Production and Development of China's Remote Water Meters", the author uses a relatively large length to demonstrate the superiority of the self-holding switch remote water meters. After three years, this remote transmission method still retains its original characteristics in technology, but a lot of improvements and corrections have been made in the production process, with hundreds of product specifications and hundreds of molds being manufactured. The actual use has also been popularized from the original 30,000 to more than 500,000, and the expansion will be promoted at a faster rate. The self-holding switch-type remote water meter has completely transitioned from a technical project to a mature product, and has smoothly risen to a product with a certain well-known brand. With its accuracy, reliability, low cost, and convenient use, it has dominated the meter reading market. This process is completely consistent with the author's design ideas. The self-holding switch type remote water meter will become the mainstream product of the remote water meter.

2. The status quo and development of direct-reading remote water meters. Direct-reading remote water meters can be roughly divided into four categories: photoelectric, contact, camera, and counting. They have two common advantages:

1. The data read from the meter is the data displayed on the dial, not pulses.

2. No electricity is required at ordinary times, and the electricity is only turned on at the moment of reading the data, so there is no fear of power outages. In theory, its read data and dial data are always synchronized. Therefore, the concept of direct reading remote water meter was born before 2000, and the field application of the actual product after 2002 has been pursued and paid attention to. . In 2003, the concept of direct-reading remote-transmission meters was deliberately incorporated in the formulation of national standards. Due to the emergence of direct-reading remote-transmission meters, whether the "pulse-type" remote-transmission meters still have vitality? The discussion brought its attention to a climax. The photoelectric type is the earliest direct-reading remote water meter, and its structure is: five reflective surfaces are set on the circumference of each water meter dial, and the corresponding There are five photoelectric couplers at the position, and the position of the counting wheel is determined by whether the couplers reflect or not. If you want to read a few digits, install sensors on several character wheels. For example, install 5× when you read 5 digits. 5=25 pairs of sensing devices. Because all the components of this direct-reading water meter are around the character wheel inside the watch core, a dry-type water meter is generally used. The structure of the contact direct-reading remote-transmission water meter is: in the pointer type A synchronous telecommunications device is installed on each pointer shaft under the dial of the water meter, and the resistance value measured by the contact potentiometer is used to determine the position pointed by the pointer. This direct-reading water meter can be used for wet-type water meters. Camera direct-reading remote The structure of the water meter is relatively simple. Install a camera in front of the display window of the mechanical word wheel to transmit the captured digital image. Counting direct-reading remote water meter is to install the pulse-collecting chip on each water meter , It keeps its work through the battery, and stores the recorded and accumulated data in the chip. The data read from the chip is the dial synchronization data. In addition, the direct-reading remote water meter also has the bar code direct-reading type, which is not here. Discuss again. Although direct-reading remote water meters have outstanding advantages, their actual effect of popularization is not ideal. Comprehensive analysis of existing problems,

There are the following points about: photoelectric and contact methods are too complicated in terms of structure.

1. Under the value conditions of the existing civil water meters, the price paid to build such a high-precision product is itself a contradiction with the degree of market acceptance.

2. They have all changed the original structure of standard water meters, and the perfect products "standard, reliable, precise and mature" accumulated and created by mankind for decades have been destroyed. It is questionable whether mature structures and standards can be established in a short period of time.

3. Whether such a complex product can withstand the test of large quantities and long-term life is still to be discussed, and many problems have been exposed. The camera direct-reading water meter does not change the mechanical standard of the original water meter, and the structure is relatively simple, but the image processing is too complicated, and it is also difficult to translate the fuzzy numbers in the image into digital. Unlike many current bus systems, the split-line meter reading system cannot be used universally. The above three methods originated from a line of thought, namely: replacing electronic accumulation with mechanical accumulation. Why? Why do you want to give up easy and difficult, electronic technology has developed to this day, can it not even complete a "accumulation"? Let's demonstrate the counting direct-reading remote water meter. Add a microchip and button battery to the existing switch-type remote water meter module. It can be made into a remote water meter that can accumulate and store data and can communicate and send information. Its output only has two lines. All installation is completed by just one connection to the bus. The meter reading station can read the water meter data at any time. Its function and function are the same as the first three direct reading meters. Each water meter can work independently from the bus. Even if the external power is cut off, the water meter is disconnected, or the water meter is moved, it will not affect the water meter count. Its success is based on the current three mature technologies. 1. Adoption of self-holding switch, 2. Accumulated memory chip supported by lithium battery.

4. Bus transmission under standard communication protocol. Because the above technologies are mature technologies that have experienced years and decades, and are compatible with conventional products in terms of production technology, raw material supply, and service system. Therefore, its success is "winner." Counting direct-reading remote water meter will become the mainstream product of direct-reading remote water meter.

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