1, typical application
WG series zero-power magnetic sensors can only be used for rotation detection. Moreover, a magnet must be installed on the rotating object to be measured. At present, most of the WG series zero-power magnetic sensors are used in civil heat meters and electronic water meters. In the electronic water meter, the wg type magnetic sensor adopts a symmetrical driving mode, and the rotating shaft end is equipped with a permanent magnet, and a pair of pulses are output in one revolution, and the amplitude is about 1v. In this design of the magnetic circuit, the magnetic flux should be passed through the center of the sensor in parallel, and the magnetic induction at the midpoint of the center should be controlled at about 6 mt.
If used under high temperature conditions, there should be a certain margin in the design of magnetic induction, because the magnetic field strength of magnetic steel will decrease with the increase of temperature. Also need to pay attention to magnetic shielding to prevent interference from surrounding stray electromagnetic fields. The counting software can be programmed by the pre-processing circuit and supported by corresponding hardware.
2, special applications
Based on the typical application of the sensor, in order to improve the accuracy of the measured flow, a multi-magnetic steel wheel rotation method was used.
The magnets are evenly arranged on the disk edge. The n and s pole faces cross up and the sensor side is on the edge. The number of magnets in the disk is determined by the diameter of the disk. The fluid pushes the impeller, which is mounted on the lug wheel outlet shaft, thereby rotating and triggering the sensor operation. Since a plurality of magnets are installed in the disk, this causes the disk to rotate one revolution, and the sensor outputs a plurality of signals through the ratio of the size of the waist wheel to the flow, thereby obtaining more accurate flow data.
The feature of the disc is that the magnetic steel is densely discharged on the edge of the disc, and the direction of magnetic lines of force of each magnet is disturbed, and a clearer alternating magnetic field of n and s cannot be formed. This makes normal magnetic sensors unable to work properly. The WG311 zero-power magnetic sensor overcomes this shortcoming by eliminating magnet magnetic field disturbances from the left and right sides of the target magnet steel and accurately catching the magnetic field of the working magnet steel to trigger it, enabling it to work properly in a chaotic magnetic field. This results in a significant increase in the accuracy of the measured flow rate. If the disk size is slightly modified and a variety of different amounts of magnet steel are installed, the accuracy will change accordingly, and the flow rate will be determined according to the flow rate of the flowmeter with different calibers. The sensor is designed to capture the special characteristics of a normal operating magnetic field in a disturbing magnetic field. The replacement use of the WG series zero-power magnetic sensor completely meets the actual requirements. Using a different processing method than the software processing, the peripheral wave processing is used to process the rectangular wave pulse directly into the single-chip computer processing, reduce software resources, realize signal sampling, and achieve signal compatibility with the flow totalizer.
In summary,
Through the selection of sensors, the special application of the WG series zero-dissipation magnetic sensor can completely replace the existing sensor in terms of structural processing or performance, and is completely ultra-low-speed detection in sensitivity performance. It is a magnetic sensor. Unmatched.
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