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FT-2500 application examples
(Note) The applications described below are provided as examples which we have had experience of the measurement in the past. However, accurate measurement of rotational speed may not be performed
depending on the rotational condition or matching between the sensor and the FT-2500. For more information, please contact your nearest distributor.
Rotational speed measurement of a DC motor
with the micro rotating shaft
The rotational speed of a DC motor can be measured without attaching the
reflective mark on the surface of the shaft. This example allows the rotational
speed measurement of the fan, which shaft is too thin that reflective mark can
not be attached or optical light can not be reflected straight when optical
sensor is used.
•
Easy operation - just input the number of fan blades.
•
Non-contact measurement - ideal for inspection line measurement.
LED reflection
fiber sensor
DC motor
Rotational speed measurement of a compressor
using an accelerometer
With a combination of the FT-2500 and suitable accelerometer, the rotational
speed of a compressor in the refrigerator, vending machine, air conditioner etc,
which shaft is not directly accessible, can be measured easily.
Put an accelerometer (NP-3000 series) on an optional magnet base (NP-0100
or NP-0101) and check the signal at various locations. And then place it at an
optimum position on the compressor.
•
Permits easy measurement of compressor shaft's rotational speed even though a
rotating shaft is not accessible.
•
Permits measurement of the rotational speed of a compressor itself and also
which is already built in a final product.
Accelerometer
NP-3000 series
Magnetic base
NP-0100/0101
Upper-/lower-limit judgment output
Compressor
Rotational speed measurement of a pump
using sound pressure
A pump's rotational speed is easily measured by monitoring exhaust sound.
The rotating shaft in a pump is generally not exposed externally, making it
difficult to perform measurement of the rotational speed by the ordinary and
conventional pulse detection method. In this example, the sound pressure of
the exhaust sound is detected for the rotational speed measurement with a
microphone.
•
Easy operation - just input the number of blades.
•
Permits measurement of pump rotations when the rotating shaft is not directly
accessible.
MI-3111
Microphone Preamplifier
Suction side
Exhaust
side
MI-1235/1433
1/2-inch Measurement
Microphone
Pump
4
Advanced Tachometer
Advanced Tachometer FT-2500
FT-2500
UPPER
LEVEL
SET
LOWER
COMP
SENS
MENU
NEXT
KEY PROTECT
SAMPLE
RECALL
ROTATION
RS-232C
CPU (Data management)
LOWER
OK
Upper-/lower-limit judgment output
(comparator function)
Advanced Tachometer
Advanced Tachometer FT-2500
FT-2500
UPPER
LEVEL
SET
LOWER
COMP
SENS
MENU
NEXT
KEY PROTECT
SAMPLE
RECALL
ROTATION
RS-232C
CPU (Data management)
LOWER
OK
UPPER
(comparator function)
Advanced Tachometer
Advanced Tachometer FT-2500
FT-2500
UPPER
LEVEL
SET
LOWER
COMP
SENS
MENU
NEXT
KEY PROTECT
SAMPLE
RECALL
ROTATION
RS-232C
CPU (Data management)
LOWER
OK
UPPER
Upper-/lower-limit judgment output
(comparator function)
Determining of rotating direction and rotational
speed measurement of a general DC motor
It is an example to determine the rotating direction and measure the rotational
speed of a DC motor by using the FT-0501 DC Motor Rotation Detector.
The FT-0501 detects the magnetic flux leakage of a DC motor and extracts a
frequency signal in proportion to the rotational speed. Since the FT-0501 has
two internal coils, a phase shift occurs between the two detected signals.
The rotating direction is then determined by the relationship of these two
phases. This function is very convenient for quality control of small DC
motors, whose rotating directions may be difficult to be determined visually.
Of course, it can measure the rotational speed.
•
Rotating direction is also determined by the output of the two-phase signal.
•
The output function (semiconductor relay) that determines the rotating direction is
useful for CW/CCW judgment on inspection lines.
DC Motor Rotation Detector
FT-0501
UPPER
Rotational speed measurement of a DC motor
in a fuel pump using a current probe sensor
Many DC motors are mounted in automobile electrical equipment. The
consumption current of the DC motor pulses in proportion to the number of
poles in the motor. The rotational speed of the DC motor can be accurately
measured by inputting the current signal which is detected by the current
probe sensor to the FT-2500.
This example is ideal for measuring the rotational speed of a stand-alone DC
motor or products (parts) that incorporate motors whose lead wires are
accessible, such as those found in automobile electrical equipment.
Power
(MAX.30VDC,10A)
Rotational speed measurement of a DC motor
A popular electric toothbrush is operated by converting the rotation of the DC
motor into the vibration. The FT-2500 with FT-0501 detector can measure the
rotational speed by detecting the magnetic flux leaking from the DC motor
which is built in such product.
•
The FT-2500 detects the pulsation of the magnetic flux leakage in proportional to
the number of poles of the DC motor which is built in the finished product.
•
Provides two steps, upper-/lower-limit comparator output which is ideal for OK,
LOWER, or UPPER determination on inspection lines.
•
Permits data management through RS-232C interface.
•
Measurement system can be configured at affordable cost.
DC Motor Rotation Detector
FT-0501
Electric toothbrush
Advanced Tachometer
Advanced Tachometer FT-2500
FT-2500
UPPER
LEVEL
SET
LOWER
COMP
SENS
MENU
NEXT
KEY PROTECT
SAMPLE
RECALL
ROTATION
RS-232C
DC motor
CW
CCW
Upper-/lower-limit judgment output
(comparator function)
Advanced Tachometer
Advanced Tachometer FT-2500
FT-2500
UPPER
LEVEL
SET
LOWER
COMP
SENS
MENU
NEXT
KEY PROTECT
SAMPLE
RECALL
ROTATION
RS-232C
Ignition Pulse Detector
IP-292/296
or current probe sensor
LOWER
OK
UPPER
Upper-/lower-limit judgment output
(comparator function)
Fuel pump
(In-tank type)
which is built in a home appliance
Advanced Tachometer
Advanced Tachometer FT-2500
FT-2500
UPPER
LEVEL
LOWER
COMP
SENS
MENU
SET
NEXT
KEY PROTECT
SAMPLE
RECALL
ROTATION
RS-232C
LOWER
OK
UPPER
Upper-/lower-limit judgment output
(comparator function)
CPU (Data management)
Set the FT-2500 to CW or CCW.
The relay is turned ON when the
setting direction is identical with
the measurement direction.
CPU (Data management)
CPU (Data management)
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