Minebea Intec PR 5211 Series, Инструкция по эксплуатации инструмента, Страница: 49 / 96

- To enter the SPAN in mV/V (through calculation using the following formula or if the
value is known from previous calibration)
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)
[Dead load]
During calibration it has to be decided:
- whether to use the empty scale as dead load (normal case)
- or to enter the SPAN in mV/V (if the scale cannot be unloaded or if the value is known
from previous calibration).
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 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 12 VDC
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 12 V DC
[Overload]
Enter in d, maximum permitted range 0 d to 9999999 d, default = 9 d. In case of weight
value over FSD + overload, an error message will be generated. The overload range
5 Getting started Transmitter Series PR 5211
EN-47 Minebea Intec