Datasheet

NANJING AH ELECTRONIC WG Series zero power consumption sensor datasheet
Using method and matters need attention
Magnetic circuit design
The key whether the zero power consumption sensor can work normally is the magnetic
circuit design. It should pay attention to the following points in the magnetic circuit design.
1. Alternately activated by N or S double poles, the distance between two poles should be near
to or larger than the sensor's length.
2. The installation position of the magnet should ensure to be on the location of the sensitive
wire and parallel to the magnetic-field component of sensitive wire, to meet the sensor’s
excitation demand, too high or too low magnetic field will affect the operating (see excitation
magnetic strength in “Parameter index”.
3. When operating in high temperature, it should remain some margin in the design of magnetic
strength, as general magnet has a negative temperature coefficient.
4. When storing and using the sensor, it should avoid the attacking of strong magnetic field
which is larger than 20mT, and it should pay attention to the electromagnetic shielding when
using the product, and prevent the interference from the surrounding stray EM field.
5. For the magnet of same material and specification, as the discreteness of the component and
the technology, there may have some difference in the magnetic strength, it needs to make a
quality control to the magnet
6. The example: The following is the graph for the ferrite bead (φouter9.5× inner6.0×
φ
3.5) used in
the water meter provided by three suppliers, it shows the attenuation of the horizontal
component of magnetic strength (“B”) with the height “h” , on the height “h” from the
surface of bead above the axial line.
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