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

1. ### EfthimiosGuest

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

2. ### hrh1818Guest

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

3. ### EfthimiosGuest

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
4. ### hrh1818Guest

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

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