Weak current College】 【direct-reading meter technology.

As technology development, continuous improvement of living conditions, the domestic intelligence requirements, a table of implementation, the implementation rate of the price of water and water management sector for data statistics and charging management needs, promoting automatic meter reading technology in the field of water meters are also in continuous development, from initial IC card table to pulse count distal recording at to today's direct-reading technology, objectively speaking, automatic meter reading technology until today there is still no improvement. technology Although direct-reading meter technology to improve automatic meter reading brought a new development opportunities, to improve automatic meter reading technology in the field of development of the water meter provides a new way of thinking, but existing direct-reading meter technology, direct-reading meter status is still not optimistic, I passed on direct-reading meter technology analysis, concise overview of the existing direct-reading meter status.

For direct reading of technology there are a variety of ways, but due to technical restrictions, or the cost of just over the theoretical stage, now known and put into production use straight-reading meter can be divided into the following three categories:

1. resistance

Resistive direct-reading meter is in the counter word wheels fixed a series of ten resistance, the wafer with two copper sheets, printed circuit board contact way Gets the resistance values, thereby to judging the size of a resistor to reaction yield data.

The disadvantage to the high volume of electric shock, if installed in a meter counter of all five integer word wheel, you need to 50 contacts, as long as any of the contact points out, a read of data will be incorrect. Secondly, in the check code, error rate, especially in the word wheel-carry is incomplete, a few yards up carry half when a fault, but a but wrong or transmission signal an error, the Division of property management or water is unable to know of the cashier. Also during the installation process, if the installation of compact, due to the increased mechanical damping of the counter, it will seriously affect the launching in flow meter and measurement accuracy, dramatically reducing sensitivity; if the installation of the pine, the problem of poor contact. Even more unfortunately, this resistance type direct-reading meter if problems, read data is more than just errors and is completely incorrect, such as the very word round bad, so this number is never read. So the resistance of the direct-reading meter almost out of the market.

2. photoelectric

Opto-electronic direct reading meter is the optical technology and decoding direct-reading technology into straight-reading meter, and specific classified as light-and opaque type two, but whether translucent or opaque type, its basic principle is the same, and are based on optical methods to read the word wheel location. Concrete is a photoelectric sensor out of infrared line or other penetrating power of light, exposure, above the word wheel or side, a word wheel on the optical encoding, light straight-reading meter is in the word wheel rear optical reading of tags, opaque is in the side or a reflective location read and interpret these optical encoding, ultimately determines that the value of size.

Opto-electronic direct reading meter while enables non-contact measurement, the measurement accuracy of a resistor with nature, but also cover up photoelectricity direct reading table because the drawbacks of its own design. As a result of photoelectric direct reading table design more complex, requiring precision is high, so the difficulty for the purposes of the processing, it is difficult to achieve large scale promotion. Coupled with the word wheel attached to the photographic materials, changed the original meter word wheel structure, so it is difficult to guarantee accuracy.

3. camera type

Camera-direct-reading meter is in the original water meter install image acquisition devices for data collection, is a small digital camera, on the word wheel on the water meter for image acquisition, through digital image processing the image into a digital signal, and then transfer by bus, meter reading, truly and eye-lookup as authentic. Camera-direct-reading meter has many advantages because it's not on the table to make any changes, so the data accurately without errors and realizing remote direct reading, very reliable.

Even though the camera straight-reading meter irreplaceable advantage, however, does not mean that the camera straight-reading meter has been perfect, but it also has some serious shortcomings. Because the camera straight-reading meter with digital image processing technique that almost all of the manufacturers are on the table-side compression of image acquisition, transfer first bit machine for processing in the background to complete the picture for the identification and handling of, and therefore the need to transfer large amounts of data, better compression technology can compress the data in 1 ~ 3k, but this is still on the original data bus is unaffordable, led to the original recording at communication lines cannot be used. Although a small number of manufacturers have in table-side for recognition, but the technology is still very immature, not meeting the needs of the market. And in the original water meters equipped with camera, the camera's power supply is relatively large, it is very difficult, existing technology is not a good solution to power the camera. And is capable of producing video-direct-reading meter manufacturers less, at the present there is no market, which form a unified norms set down criteria is also very good.

These are for the current analysis of the direct-reading meter, and not defame or exclusion of directly reading the table, just actuality to analysis out towards a more fit reality using meter reading programme. I think the present situation and existing skill levels, pulse water meter should be market-led. Pulse water meter sensor technology primarily Reed pipe sensor and Hall sensors, Wiegand sensors, photoelectric sensor. These sensors are accumulated through sensors transform, temporary storage, data transfer is done in three steps digital automatic meter reading. Use a meter to a pointer or gear mosaic magnetic materials to first measure numbers into electrical pulse signal, and then single-pulse signal acquisition, accumulation, storage and transmission, final transfer to the host computer for remote meter reading. Because of the principle of pulse water meter itself and the structure itself, the device has been on the measurement of the pulse meter accuracy and stability exist. We do a Reed pipe of critical issues, forVibration problems, rust-proof for magnetic steel, steering problems, and more problems are lack of understanding, which often also problems with the system itself entangled in, let one hours indistinguishable.

But technology is in the continuous improvement of the processing technology, the device is constantly improved. After years of efforts, these issues have been a good solution. By Reed pipe becomes a double-reed pipe, or even maintain single Reed pipe, the Hall element, but the addition of new technology, better solve the critical point and vibration problems. Improvement in magnetic devices, has now found the SmCo materials or aluminum, cobalt, nickel, replace the magnet, magnet ND-Fe-b material, solve the problem of rust and demagnetization.

Since many years technology continue to improve the quality, components, current pulse water meter technology developed more mature and stable, pulse water meter while today there are some shortcomings, but compared with the fledgling multiple gauge technology is mature, over a given period of time the pulse water meter is also irreplaceable advantage. Because of this, many manufacturers are constantly study meter technology, do not let the pulse water meter dismounted immediately. On the contrary, given that the water meter current problems unresolved and more difficult to break through the technical difficulty of the situation of the intelligent water meter manufacturing industry, several more strength and authority of the company's attitude towards the customer is responsible for, and still in high-volume production of pulse water meter, and not rush to be immature meter on the market.

Facts have proved that pragmatic enterprise and requirements of increasingly stringent customers are on the pulse water meter with confidence that the water meter pulse full visible at this time or not be replaced. Therefore we now is important to recognize the reality instead of blindly believed in new technology, simple opinion pulse water meter has no room for development. In the present technological standards of the era, the pulse water meter while more advantages, but that does not mean that the water meter pulse will never be replaced, we are also for the improvement of the water meter technology making unremitting efforts, I believe that in the next few years, as technology advances, the meter's technology will develop a mature, we also look forward to give users an early lead more stable, reliable and more perfect meter.