10
5.4. Verifying Load Cell Output and Input Sensitivity
The input sensitivity is 0.1 µV/division or more. When designing a weighing scale, the following
calculation formula should be satisfied.
The input sensitivity requires a change in output voltage, from the weighing device, to change the
display value as a one digit step. In order to achieve a scale with stable performance, select the
input sensitivity as large as possible.
Calculating formula:
0.1
≤
E
x
B
x
d
A
: Rated capacity of load cell
B
: Rated output (mV/V)
d
: Minimum division
E
: Excitation voltage (mV) = 5000 mV for FG-D-CWP
n
: Number of load cells
A
x
n
Example of calculation:
In the case of designing a scale with a capacity of 60 kg and minimum division of 0.005 kg, using one load
cell with a rated capacity of 100 kg and rated output of 1 mV/V:
Rated capacity of Load cell:
A
= 100 kg
5000 x 1 x 0.005
= 0.25 > 0.1
Rated output:
B
= 1 mV/V
Minimum division:
d
= 0.005 kg
100 x 1
Excitation voltage:
E
= 5000 mV
Number of load cells:
n
= 1
The above indicates there is no problem
with this design.
