Strain Guage Indicator: 409-W
REF NO: m59A/om/501
Issue NO: 03
Page 24 of 34
Calibration using keys:
Enter into
CALIB
mode with front panel keys,
Zero Calibration: feed zero weight and Press
key
Span calibration: feed span weight and press
key
Calibration using Modbus: Modbus address 40099
Zero Calibration: feed zero weight and write “1”
Span calibration:
feed span weight and write “2”
Modbus addresses for calibration are given in table 8.1.
Sr.No
Parameter
Absolute
address
Type
Minimum
value
Maximum
Value
Access
Type
1
Process value
40091
Swapped Long
-19999
99999
R
2
*Resolution
40093
Swapped Long
0
4
R/W
3
Zero display
40095
Swapped Long
-19999
99999
R/W
4
Span display
40097
Swapped Long
-19999
99999
R/W
5
Calibration index
40099
Swapped Long
1
2
R/W
Table 8.1.
Theoretical mV calibration(
TH-mV
)
a. Set resolution, enter span point of weight.
b.
Set “
mV-FS
” mV derived from measured excitation voltage and load cell
output in mV/V.
c. Now display indicates Process value for
zero in “
CALZ
”
index, last digit
decimal point of display blinking indicates calibration mode.
d. Process value for zero calibration is set simply by emptying the scale, Press
key to calibrate displayed value to 0.00.
Example
:
For a system of maximum capacity 4000.0 kg with .1 decimal point resolution,
Weighing load cell has the following data:
• Excitation voltage: 10 V
