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- Is it possible for the sensors to
detect terrestrial magnetism?
Terrestrial magnetism cannot be detected. Magnetic differentiation
sensors are suitable for AC magnetic filed detection.
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- Is it possible for the sensors
to read magnetic stripe information on cash cards?
Magnetic stripe information cannot be read. The sensors' built-in
permanent magneto will generate magnetic flux leakage of approx. 95
kA/m, which causes damage to the magnetic information on cash cards.
Only if the magnetic information has a coercivity of 95kA/m or higher,
can that information be read.
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- Is it possible for the sensors
to recognize
 as a circle?
If a circle is printed with magnetic ink, the sensors convert the shape
of the circle into an electrical signal. The difference in electrical
signals between circle and square patterns is as follows:
When circle, square, and stripe patterns are scanned, the sensor
outputs the following signals.
The circle pattern is differentiated from the square pattern by the
output level, and the circle pattern is differentiated from the stripe
pattern by the number of peaks and output level.
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- Which polarity does the
detecting surface have?
With the BS05N1 and BS05C1 types, the detecting surface functions as
the S pole. With other types of sensors, it works as the N pole. The
polarity has no influence on the sensors' performance (output,
response, etc.). However, when the sensors read magnetic patterns, the
rise of the output signal varies depending on the polarity.
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- Is it possible for the sensors
to detect paper money in wet conditions?
There is no problem except BS05C types, because the sensors are
protected by the can case.
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- Does electrostatic noise affect
the output signal of the sensor during paper money detection?
Electrostatic noise will affect the sensors' output signal. Be sure to
ground the sensors through the F.G. terminal provided on the can case.
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- How high is the resolution?
The sensors can detect a pattern pitch of up to 0.1 mm. For details,
refer to "Element Pitch and Output Signal"
in the Application Guide.
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- Is it possible for the sensors
to detect paper money without being in contact with the target?
The sensors are enabled to do non-contact detection. For details, refer
to "Gap Characteristic" in the Application
Guide.
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- How wide (mm) is the maximum
detecting width?
Sensors with a detecting width of 6 mm or 10 mm have been available
from Murata. According to users' needs, we can offer custom-made models
with a detecting width of 20 mm or less.
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- Can the detecting surface be
rounded like a coil head?
Yes, it can. However, if the detecting surface is rounded, detection
efficiency will be deteriorated.
The sensors' detecting element is a plane. The sensors' output is
proportional to the square of the distance between the detecting
element and the target medium. If the detecting surface is rounded, the
gap between the detecting surface and the element is increased, and the
output will be decreased by this gap. Sensors with a rounded detecting
surface have not been available from Murata, but if you need this type,
consult Murata Manufacturing Co., Ltd.
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- How high is the wear resistance?
Murata offers various sensors that can withstand 800,000 to 300 million
passes of paper money (based on testing methods specified by Murata).
For details, refer to "Wear Resistance
Characteristic" in the Application Guide.
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- Can we specify the rank of
output voltage?
Yes, you can. Consult Murata Manufacturing Co., Ltd.
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- Is it possible for Murata to
make a sensor with a shape or detecting width not specified in the
catalog?
According to users' needs, we can offer custom-made models. Consult
Murata Manufacturing Co., Ltd.
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- Is it possible for Murata to
supply sensors with lead wire and connector mounted?
It is possible. Consult Murata Manufacturing Co., Ltd.
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- How large is the resistance
change ratio?
Provided that the resistance for non-magnetic fields is "1", the
resistance will change approx. four times when a magnetic flux density
of 0.3 T is applied. In the range where the magnetic flux density is
0.08 T or less, the ratio of resistance change will be decreased. The
sensors provide a bias magnetic field so that the sensors operate in
the range where the ratio of resistance change relative to magnetic
flux density is high. For details, refer to the section titled "Characteristics of Magnetoresistive Elements".
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- How wide is the multichannel
sensor's minimum insensitive interval between channels?
BS05M1KFFA is approx. 0.4mm, BS05M1HFAL is approx. 2mm, and other multichannel sensors don't have insensitive interval.
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- How to select the optimal sensor
Refer to the Selection Guide. According to
users' needs, we can offer custom-made models. Consult Murata
Manufacturing Co., Ltd.
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- Precautions for circuit design
Refer to "Recommended Circuit" in the
Application Guide. Since the signal level is minute, the amplification
factor must be high. For the operational amplifier, the CM358 or
equivalent low-noise type is recommended. For sensor output coupling
capacitors, Tantalum capacitors or ceramic capacitors that generate
little leakage current are recommended.
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- Is it possible for the sensors
to detect magnetic ink patterns printed on both the front and back of
paper simultaneously from one side?
If the paper thickness is 0.1 mm, when patterns on both the front and
back of the paper are simultaneously detected, the signal level for the
back pattern is approx. 85% of that for the front pattern. For details,
refer to "Gap Characteristic" in the
Application Guide.
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