TELELIFT 3713 SX
TECHNICAL SPECIFICATIONS
4
Document 57.4402.9200 - 1
st
Edition 10/2006
INDEX
9.
CALCULATING THE WEIGHT APPLIED ON THE CELL
To find out the weight on the load cell, you need to know:
•
the excitation voltage (in V)
•
the load cell capacity (in kg)
•
the sensitivity of the cell (in mV/V)
•
the load cell output voltage (in mV)
The excitation voltage is the voltage applied between terminals
A
and
B
of the load cell (Fig. 16). The nominal value is 5 V, but in practice it can
vary between 4.75 V and 5.25 V.
The load cell capacity is the maximum weight that can be applied on
the cell, resulting in the maximum output from the cell (see following
table).
The output voltage is measured between terminals
C
and
D
of the cell.
The sensitivity of the load cell is the ratio between the output voltage (in
milliVolt) and the excitation voltage (in Volt), when the cell is loaded with a weight equal to its capacity. All load cells
fitted in the rear axle have a 1 mV/V sensitivity. This means that, considering a 10000 kg capacity load cell, under
a 10 000 kg load and with a 1 V excitation voltage, the output voltage is 1 mV; if the excitation voltage is 2 V, the
output voltage is 2 mV and so on.
Use the following formula to compute the weight:
A
B
D
C
Fig. 16
The maximum output voltage is:
excitation voltage x sensitivity = maximum output
In this example, since the load cell sensitivity is 1 mV/V and the nominal excitation voltage is 5 V, the full-scale
voltage is 5 mV.
Example:
10 000 kg capacity load cell, with 3.2 mV output voltage
the weight on the cell is:
cell capacity
maximum output
x output voltage = weight on the cell
10000 kg
5 mV
x 3.2 mV = 6400 kg
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