6. Operating | 6.14 - Calibrating internal weighing point | 101
6.14.2.3 Determining the dead load
To use the empty scale/hopper as dead load (normal case):
1. Clear the scale/hopper.
2. Click [by load] in the task bar.
3. Click [Set dead load] in the task bar to save the dead load.
Note:
If the mV/V value of the dead load was calculated, or if it is known from
the previous adjustment, the value can be overwritten by pressing [by m
V/V].
Calculate dead load
Voltage equivalent [mV/V] = dead load × load cell sensitivity C
n
[mV/V]/ load
cell capacity (maximum capacity E
max
× number of load cells)
load cell sensitivity C
n
= rated output C
n
(see technical data for the load cell)
Normally, calculation of the dead load (scale without load or empty vessel) is
not necessary.
Subsequent dead load correction can be used for later re-determination of
the dead load, when the scale or vessel is empty.
Example:
–
1 load cell with rated output C
n
= 2 mV/V
–
At max. capacity 2000 kg (LC)
–
Max. capacity (Max) 1000 kg
–
Dead load 500 kg
–
Load cell supply voltage U
DC
= 5 V
LC 2 mV/V @ 2000 kg
Supply U
DC
= 5 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)
