Load cells / Sensitivity

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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?

Re: Load cells / Sensitivity
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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

Re: Load cells / Sensitivity
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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

Re: Load cells / Sensitivity
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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

Re: Load cells / Sensitivity
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All true.  Back when i was using load cells in 100 lbf and 500 lbf
full scale i had to deal with 3 kHz signals produced by the
mechanical slop in the system.  The machine ran as "fast" as
700 rpm (10 hZ).  It was a test system trying measure life of a
thing called a flex pivot.  It also had systems to monitor for and
detect the acoustic signatures that notable in one failure mode.
Regular stoppages and parts inspections for other failure modes.
The actual test run a less common failure mode detection
stopped the test for a few weeks.


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