7.14.8.1 Calculating SPAN value
Calculating SPAN
SPAN indicates the equivalent input voltage in mV/V related to the maximum capacity
(Max) of the scale. It is calculated as follows:
SPAN [mV/V] = maximum capacity x load cell sensitivity C
n
[mV/V] / load cell capacity
(maximum capacity E
max
x number of load cells)
load cell sensitivity C
n
= rated output C
n
(see technical data for the load cell)
Calculate dead load
The input voltage in mV/V equivalent to the dead load can be calculated by using the
dead load rather than the maximum capacity in the formula specified above.
Normally, calculation of the dead load (scale without load or empty vessel) is not
necessary.
Subsequent dead load correction (see Chapter
7.14.10) can be used for later re-
determination of the dead load, when the scale or vessel is empty.
LC 2 mV/V @ 2000 kg
Supply U
DC
= 12 V
SPAN = 1 mV/V
Dead load 0,5 kg 1000 kg
Max
1.5 mV/V
(18 mV)
0.5 mV/V
(6 mV)
Example
- 1 load cell with rated output C
n
= 2 mV/V
- At maximum capacity 2000 kg
- Maximum capacity 1000 kg
- Dead load 500 kg
- Load cell supply voltage U
DC
= 12 V
X3 Process Indicator PR 5410 7 Getting started
EN-174 Minebea Intec
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