Commissioning PR 5211 Instrument Manual
EN-32 Sartorius
4.9.1.3 Resolution magnifier: x10
During calibration the display resolution (scale interval) can be increased by factor 10.
4.9.1.4 Deadload
The value of the unloaded scale/empty hopper is the deadload. The input voltage equivalent to this weight
value is displayed/ stored in mV/V. For calculating the voltage for deadload the same formula is applied as
for SPAN (Full scale has to be replaced by dead load), see chapter 4.9.1.5.
Default: 0.000000 mV/V
During calibration it has to be decided:
• To use the empty scale as deadload (normal case)
• To enter the deadload in mV/V (if the scale cannot be unloaded,
• or the value is known from previous calibration)
If the deadload has to be changed later (due to weight decrease or increase of the empty scale), it can be
done without influence on the other data like SPAN.
4.9.1.5 SPAN
The SPAN indicates the equivalent input voltage in mV/V related between deadload and the scale FSD (full
scale, maximum capacity Max).
d cells)of all loanumberE
capacity.capacity (
load cell
[mV/V]ty C sensitivi
load cell full scale
] = SPAN [mV/V
n
*
max
*
max
Span in [mV/V]; Full scale (Max) as a weight value;
Load cell sensitivity C
n
[mV/V] = rated output (see technical data of the load cell);
Load cell capacity ( = sum of all load cells) as a weight value
Default: 1.000000 mV/V
During calibration it has to be decided:
• Set SPAN by weight (load the scale with the calibration weight and enter the value of the calibration
weight)
• Enter the SPAN in mV/V (from calculation of above formula or if the value is known from previous
calibration)
Example of a scale with a load cell capacity of 2 t, 2 mV/V load cell sensibility and a full scale deflection of
1000 kg:
After the calibration a value of 0.5 mV/V had
been generated for the deadload.
The SPAN value is determined to 1 mV/V.
With 12 Volt supply a measuring signal of 6 mV
could be calculated for deadload.
This measuring signal could be measured directly
with a voltage meter at the measuring inputs
(M+, M-).
For the SPAN a measuring signal of 12 mV could
be calculated. At full scale deflection the
measuring signal is deadload value + SPAN =
18 mV (M+, M-).
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