SENSY Presentation SENSY Presentation KNOW HOW & FLEXIBILITY - - PowerPoint PPT Presentation

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SENSY Presentation SENSY Presentation KNOW HOW & FLEXIBILITY - - PowerPoint PPT Presentation

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SENSY Presentation SENSY Presentation KNOW HOW & FLEXIBILITY THE WAY TO EXCELLENCE Bringing solution through special force transducers, load cells as well as customized systems is Sensy motto SENSY Presentation_EN 2 25/05/2009

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SENSY Presentation SENSY Presentation

KNOW HOW & FLEXIBILITY THE WAY TO EXCELLENCE

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Bringing solution through special force transducers, load cells as well as customized systems is Sensy motto

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Points :

SENSY company : Presentation Load cells and force transducer : definition and applications Principle and characteristics Communications protocols : SENSY solutions Projects …

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Definition :

Element which deliver a electric signal proportional to its applied force.

Technical data :

Non-Linearity Resolution Hysteresis Sensitivity Non-Repeatability

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Model 2162 (small hoppers and computing scales)

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Model 5000 : redundant solution for safety on Overhead cranes

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Model 5000 : Custom made load pins

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Model 5000 : a wide range of OEM solutions with or without integrated amplifier : 4 – 20 mA and 1 – 5 V

High capacity load pins: 260 t

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Special Custom made force transducer for Shaft bearing

  • n cranes

Capacity: 45 t

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Custom made torque transducer for automotive gear transmission

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Custom made load cell 3 independent Bridges :

Tension Compression Torque

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Bidirectional scale : Fz & Fx : Testing of truck’s brake

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Model 5950 (tanks and reactors weighing)

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INSERT GAGE (Model 3300) Silos levelling

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Model 2712 Tension/Compression Hoppers & tanks of medium size

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Model 5600 (weighing of chemical reactors )

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Torque measurement on an axle (customers own material made up)

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Stress measurement on concrete pipe

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Model 5105 20MN (2000t) – Testing machines

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Special application : windscreen wiper

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Model 9PED : bidirectional pedal for bike

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Model 6500M : torque measurement

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SENSY Load cells : used principle :

Strain gages of extensiometry : The strain gages

are bonded on the mechanical element to have the same deformation.

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Which are the elements of influence of a Force sensor?

Mechanical element Bond Strain gages Corrections of the drifts (Integrated amplification card)

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Bending load cells used as for:

Scales Pallets scale Small to medium range hoppers Etc…

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Principle : Wheatstone bridge

Vout = 0 Volts if charge = 0 N

Each resistance is a gage which varies according to its deformation. Advantage: Output signal = 0 Volt in absence of force combined with differential measures (less disturbance).

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Knowing the relation Defined by the strain gages principle We may write :

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Sensitivity definition:

It determine the evolution of the

  • utput variable according to the

size of entry in a given point. It is the slope of the tangent to the curve resulting from the sensor’s characteristics.

Used formula: Unit: mV/V (from 1 to 2 mV/V)

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Strain gauges

Passive sensor which translates into variation resistance their

  • wn deformation.

2 types of gages which are characterized by the variation from resistivity

  • Metallic strain gages
  • semiconductors
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Metal gages: Using the relation of Bridgman who allows to bind

the variation of resistivity to the variation of volume.

Semiconductor gages: Use the piezo-resistivity effect. The

variation of resistivity is expressed according to the constraint s and of the piezo-resistive coefficient p by the relation:

After calculations, we obtain: With K = factor of gage

  • Rem. : K often oscillates around 2 for the strain gages, and between 100

and 200 for semiconductor gages.

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SENSY is using metal gages of 120, 350... 5000 Ohms.

Advantages:

  • Better positioning
  • Better temperature behavior
  • Less fragile and less expensive.
  • Diversity of the gages according to their creep resistance.
  • Better linearity.

Characteristics of the semiconductor gages:

  • Adapted very well to the measurement of very weak deformations
  • Better adapted to dynamic measurements.
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Concept of accuracy at SENSY:

In the case of a sensor of force, the accuracy represents the whole

  • f the errors on the linearity,

Hysteresis, the non-repeatability, creep, sensitivity drift of in temperature, etc... For example:

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Mechanical characteristics

Zero and hysteresis

Elastic range Plastic range

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Load cells and force sensor development

Data

  • Capacity
  • Dimensions

Load cell design depends on the type of stress but also

  • n its capacity, temperature range of use , etc…)For the

design, we do use a software which allows to calculate the strains gages localization by finite element. Examples…

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Simulation by finite elements on the Model 5190

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Model 2625 (10t)

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Model 2625 «On board » application

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Model 2712 (200kg): application

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Model 5100L (customized) IP68, submerged environment (used under the sea – long term period)

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Available output

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Digital reference load cell

Various types of output

  • RS232
  • RS485

Advantages:

  • Digital correction of the temperature drifts.
  • Signals much less prone to the parasites.
  • Reading by an ordinary PC.
  • Very high resolution.
  • Faster calibration, etc…
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Digital sensors project in progress:

Multiplication of achievements of programs "to measure" For example: evolution of the signal sensor according to time in a graph, tests or calibrations of machines in accordance with standards. Digital Standard Reference load cell.