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Force gauge

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A Force Gauge is measuring instrument used across all industries to measure the force during a push or pull test. Applications exist in research and development, laboratory, quality, production and field environment. There are two kind of force gauges today: mechanical and digital force gauges.

A digital force gauge is basically a handheld instrument that contains a load cell, electronic part, software and a display. A load cell is an electronic device that is used to convert a force into an electrical signal. Through a mechanical arrangement, the force being sensed deforms a strain gauge. The strain gauge converts the deformation (strain) to electrical signals. The software and electronics of the force gauge converts the voltage of the load cell into a force value that is displayed on the instrument.

Test units of force measurements are most commonly newtons or pounds. The peak force is the most common result in force testing applications. It is used to determine if a part is good or not. Some examples of force measurement: door latch, quality of spring, wire testing, strength ... but most complicated tests can be performed like peeling, friction, texture.


Digital force gauges use strain gauge technology to measure forces. The principle is as follows :
 

The strain gauge

A strain gauge is composed of a resistive track and a deformable support.

Resistive track Deformable body
Body deformation



If the body is deformed, as above in traction, the length of the resistive track increases. Consequently, its resistance increases.

 

The Wheatstone Bridge

To measure the change in force, the change in resistance of the strain gauges is measured. To carry out this measurement, we use an electrical arrangement called a Wheatstone bridge as shown opposite. This circuit is in fact composed of 4 strain gauges placed in parallel in order to have a better linearity of the measurement.

Powered under constant voltage, the variation of the strain gauges varies the voltage measured by the Voltmeter on the diagram above. The value measured by V is proportional to the variation of the strain gauges according to the following formula :
 
V = (E x (R1 / (R1 + R4)) - E x (R2 / (R2 + R3))

 

From the strain gauge to the force gauges

Analogic Digital
Software
Processing
Filters
Calculations

To be integrated into a force gauge, the strain gauges are carefully bonded to a deformable aluminium or steel body depending on the measuring capacity. This body has a special geometry that ensures a large and repeatable deformation. The strain gages must fit perfectly to the support to ensure a good measurement. The measurement of voltage variation is carried out by an electronic acquisition board which converts the measured analog signal into a digital signal. This electronic board also includes a software which allows to condition the information: filtering of the values, calculations (maximum for example), RS232 output...
Finally, the software transmits the information to the display, which allows to display the measurements, the results, draw a curve etc.. The whole of its elements constitute a force gauge which is moreover equipped with a battery and a protective shell to make it autonomous and portable.

 

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Article Related Products

Touch screen advanced force gauge

Centor Star Touch, Advanced touchscreen force gauge

Series code: CNR CT
Availability: 5 days
Highlights:
  • Color touchscreen with live graphing
  • Peak and Break detection
  • Calculations: average, 1st peak,...
  • Automatic recognition of additionnal sensors
  • Wireless load cell compatible
  • Certificate of calibration included
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Andilog

ANDILOG TECHNOLOGIES is a recognized specialist for over 25 years in measuring instruments for force and torque applications in the industrial and research markets. We achieved this goal thanks to a culture of innovation and a strict quality policy. For each measurement case of force or torque, Andilog is creating an innovative and ergonomic solution. We offer measuring devices such as test benches, software, force and torque gauges, digital displays, manual and motorized test stands. We also have every possibility of calibration in force and torque in our laboratory. Our experience as a designer, a manufacturer and an integrator of portable force measuring systems allows us to offer integrated products into complete systems for assembly or manufacturing. All these products feature the latest technologies and are designed for ease of use by industry technicians, laboratory or research.

Andilog Technologies ISO 9001:2015 Certified Certificate #A529
ISO 9001:2015 Certified
Certificate #A529

ANDILOG TECHNOLOGIES, for force gauge, torque gauge and test stand A complete range of force measuring instruments

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