Force Sensors
Description:
Quick response whether Gram or Ton !
Force sensors are washer type loadcells that piezo effect of quartz crystal is utilized. Extremely small size with a wide measuring range.
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Introduction to Force Sensors
Features
• Microminmiature
• High rigidity and durability
• Measurement of high speed variations of loads (a few millisecond)
• Apply to quasistatic measuremrnt (With the use of an exclusive charge amplifier)
Application
• Monitor for precision press machine
• Monitoring of press for spot-welded electrode
• Monitoring of crimping force for cable terminal
• Measurement of bolt axial tension
Principle
A piezoelectric element such as piezoelectric ceramics or quartz crystal generates an electric charge proportional to the mechanical force applied:
Fuji Ceramics force sensors are a direct application of this characteristic.
Installation
A sensor is placed tightly between two flat and high rigidity plates (upper and lower plates) so that the load is distributed uniformly over the sensing surface.
Recommended specifications of the jig for preloads
It is necessary to calibrate sensitivity after preloads (pinched by a bolt).
Output of force sensor
Discharge time constant and Zero shift are the features of piezoelectric force sensors.
Calibration
We provide AIST traceable calibration.
Glossary
• Sensitivity
Output per one N(newton). Linear outputs are obtained for up to the maximum usable load.
• Measurement range
Maximum load that can be measured by a force sensor in normal operating conditions.
• Overload
Should a load exceeding the measurement range be applied to a sensor, this sensor does not deteriorate in characteristics. Sensors may not be used continuously under the overload.
• Discharge Time Constan（t DTC）
A piezoelectric force sensor is characterized by self-discharge. The output voltage presents an exponential curve that changes at a proportional rate for a given length of time. The discharge time constant is the period of time during which the output voltage drops to 36% of the initial value. -
Load Washer
Features and Applications
• High rigidity
• Measurement of dynamic and quasistatic force
• Machine control
• Research & development
Specifications
Values with（ ） are under the condition of non-preloads.
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Force Link
Features and Applications
• High rigidity
• Measurement of dynamic and quasistatic force
• Measurement of tensile and compression force
• Calibrated sensor
Specifications
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Charge Amplifier and others
Charge Amplifier
Charge amplifier will receive electric charge from force sensors and convert it into voltage signals.
CAB1 is a compact and fixed-gain type model, then the best choice for the introduction into production line and/or inspection process.
The Reset function by external signal is available.
Charge amplifiers for accelerometers can be used for force sensors.
However, they cannot measure quasistatic loads. (They can measure only dynamic loads.)
High isolated cable
Force hammer
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IEPE Load Washer
Features and Applications
• High cost performance
• High Rigidity
• Dynamic force measurement
• Process monitoring
Specifications(for compression force)
1：Values are under the condition of non-preloads.
Size
Product concemed ／ 3 channel constant current power supply CCPS-3A
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IEPE Strain Sensor
Piezoelectric strain sensors can monitor the variation of press loads indirectly by the measurement of the surface strain with fitting to the frame of the press machine.Features and Applications
• High cost performance
• Indirect dynamic force measurement
• Dynamic strain measurement
• Press force monitoring
• Easy mounting with single bolt
Specifications
Installation
The mounting surface of the object to be measured will require finishing (please see below), and then a sensor will be screwed with an attached M6 clamping screw.Piezoelectric strain sensors have specific detectable directions. Therefore, the mounting direction will need to be adjusted to the strain direction of the object to be measured accordingly.
※Finish of the mounting surface (recommended values)
Product concemed ／ 3 channel constant current power supply CCPS-3A