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Because most of the meter reading systems are pulses emitted from the reading table, the pulses are easily disturbed during the transmission, resulting in reading errors. To eliminate this kind of meter reading error, such a meter reading system must be used to place the data acquisition device on the header, header collector and collector through a simple transmission control protocol, which can effectively avoid data transmission. The process caused errors due to interference.
Find the cause from the pulse table itself below. The sensors that generate pulses on the pulse table can be divided into: Reed-reed type, Hall element type, and photoelectric conversion type. The basic principle of the Hall element type is to install a Hall element and a magnet in a water meter (or a natural gas meter) that is counted in an ordinary turntable, and a sensor based on a magnetoelectric conversion technology can be constructed. The Hall element is fixedly installed near the counting dial, and the permanent magnet is installed on the counting tray. When each rotation of the rotating disc, the permanent magnet passes through the Hall element once to generate a measuring pulse at the signal end. The basic principle of the reed pipe type is to install a reed pipe and a magnet in a water meter (or gas meter) that is counted on an ordinary turntable. The reed switch is fixedly installed near the counting turntable, and the permanent magnet is installed on the counting table. When the turntable is Every revolution, the permanent magnet generates a metering pulse at the signal end once through the reed switch. The basic principle of photoelectric conversion is: a photoelectric transducer is installed on the turntable of the electric meter, and there is a groove on the turntable. When the turntable makes one turn, the groove passes through the photoelectric converter to complete a photoelectric conversion and output a pulse.
The accuracy of the number of pulses will determine the accuracy of the remote metering system. From the current actual completion of construction, the accuracy of remote gas meters and meters is high. The condition of the water meter is not satisfactory or even very bad. There are two main reasons: the quality of the reed pipe is not high, water hammer occurs in the water pipe, and a large number of pulses (increase pulses) are issued.
In the pipeline system, if transient flow occurs, the flow velocity, pressure, and other parameters of the flow change with time. The magnitude of the change depends on the initial flow regime of the pipe flow, the characteristics of the pipe system, and transient formation conditions. Due to sudden changes in the flow rate caused by a series of sudden pressure fluctuations in the phenomenon of alternating hydraulic pressure, the pipeline will undergo severe vibration and a loud sound, this phenomenon is called water hammer phenomenon. In daily life, we often meet the situation where water pipes vibrate and make noises, that is, water hammer phenomenon. It is this severe jitter that causes the reed switch springs to pull in frequently and emit a large number of pulses in a short period of time.
In remote metering systems, the inaccuracy of the water meter pulse is mostly caused by the above reasons. These conditions have seriously hampered the development of remote metering systems. The water hammer phenomenon is extremely counterstained, and it is related to the inner wall friction, pressure, and liquid flow rate. We cannot solve it fundamentally. However, in practice, we increase the width of the pulse to filter out some noise. We can set certain judgment functions on hardware and software to filter out false pulses. In this way, the data we collect from the front end is more accurate.
At present, the quality of domestically produced remote water meters is indeed worrying and has seriously hampered the development of the three-meter remote transmission system. Therefore, if we want to fundamentally solve the problem, we must start from the principle of developing new types of remote gas, electricity and water meters.
According to the survey, the highest rate of complaints is recorded in meter reading systems in smart communities. The main reason is that the meter reading system needs further improvement. There are two reasons for inaccurate meter reading: (1) interference with data transmission; (2) problems with pulse water meters, electricity meters, and gas meters themselves.