Load cells / Sensitivity

Discussion in 'Electronic Design' started by Efthimios, Feb 3, 2008.

  1. Efthimios

    Efthimios Guest

    Hi,

    In the specs the load cells sensitivity is given "mV/V" ex: 2mV/V.

    How this is translated to force sensitivity, for example: mV/grf?
     
    Efthimios, Feb 3, 2008
    #1
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  2. Efthimios

    hrh1818 Guest

    On Feb 3, 1:35 pm, Efthimios <> wrote:
    > Hi,
    >
    > In the specs the load cells sensitivity is given "mV/V" ex: 2mV/V.
    >
    > How this is translated to force sensitivity, for example: mV/grf?


    A load cell sensitivity is stated in terms of its rated full scale
    load. An equation for the output would be:

    Eout = (Sensitivity/Full scale load) * (Excitation Voltage) * (Applied
    Force.)

    Example Sensitivity = 2mv/V, Full Scale Load = 5 Kg, Excitation
    Voltage = 10 Volts DC, Applied Load = 2.5 Kg

    Eout = (2/5)* 10*2.5

    Eout = 10 mV DC

    Howard
     
    hrh1818, Feb 4, 2008
    #2
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  3. Efthimios

    Efthimios Guest

    On Feb 4, 1:59 am, hrh1818 <> wrote:
    > On Feb 3, 1:35 pm, Efthimios <> wrote:
    >
    > > Hi,

    >
    > > In the specs the load cells sensitivity is given "mV/V" ex: 2mV/V.

    >
    > > How this is translated to force sensitivity, for example: mV/grf?

    >
    > A load cell sensitivity is stated in terms of its rated full scale
    > load.  An equation for the output would be:
    >
    > Eout = (Sensitivity/Full scale load) * (Excitation Voltage) * (Applied
    > Force.)
    >
    > Example Sensitivity = 2mv/V,  Full Scale Load = 5 Kg,  Excitation
    > Voltage = 10 Volts DC, Applied Load = 2.5 Kg
    >
    > Eout = (2/5)* 10*2.5
    >
    > Eout = 10 mV DC
    >
    > Howard




    Thanks Haward for the info.

    Do you know if load cells/force sensors can pick up vibrations of up
    to 1kHz? I can not find in the specs of the cells any info.


    Efthimios
     
    Efthimios, Feb 4, 2008
    #3
  4. Efthimios

    hrh1818 Guest

    On Feb 4, 10:15 am, Efthimios <> wrote:
    > On Feb 4, 1:59 am, hrh1818 <> wrote:
    >
    >
    >
    > > On Feb 3, 1:35 pm, Efthimios <> wrote:

    >
    > > > Hi,

    >
    > > > In the specs the load cells sensitivity is given "mV/V" ex: 2mV/V.

    >
    > > > How this is translated to force sensitivity, for example: mV/grf?

    >
    > > A load cell sensitivity is stated in terms of its rated full scale
    > > load. An equation for the output would be:

    >
    > > Eout = (Sensitivity/Full scale load) * (Excitation Voltage) * (Applied
    > > Force.)

    >
    > > Example Sensitivity = 2mv/V, Full Scale Load = 5 Kg, Excitation
    > > Voltage = 10 Volts DC, Applied Load = 2.5 Kg

    >
    > > Eout = (2/5)* 10*2.5

    >
    > > Eout = 10 mV DC

    >
    > > Howard

    >
    > Thanks Haward for the info.
    >
    > Do you know if load cells/force sensors can pick up vibrations of up
    > to 1kHz? I can not find in the specs of the cells any info.
    >
    > Efthimios


    Two comments. A Google search on "load cell frequency response"
    turned up several links to companies who said they make load cells
    with a high frequency response. Only one mentioned an actual number.
    That was Honeywell who said their Sensotec Model 11 can have a
    frequency response up to 58 kilo hertz. Load ranges vary from 150
    grams to 1000 lbs. I expect only load cells at the 150 gram end of
    the range can achieve a 58 kilo hertz frequency response and there is
    a drop off of the frequency response as the size of the load cell is
    increased.

    Howard
     
    hrh1818, Feb 4, 2008
    #4
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