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WAGO-I/O-SYSTEM 750
Appendix 169
750-489 4AI RTD/TC/Strain Gauge Ex i
Manual
Version 1.1.0, valid from FW Version 02
13
Appendix
13.1 Strain Gauge Application Example
In the test setup, a load cell is connected to the I/O module (e.g., Channel 1 and
Channel 2).
The load cell has a 2.4
V supply voltage (+I1, −I1) from the I/O module.
The reference voltage (U
ref
) is detected by the U
ref
channel (+E1,
−E1) and the
bridge voltage by the U
d
channel (+
E2, −
E2).
The reference voltage is measured by the “SG - U
ref
2.4 V” setting and the strain
gauge bridge voltage by the “SG - U
d
±15 mV” setting.
Sample equation:
Technical data of the load cell used
:
e.g., 5 kg equals
2
𝑚𝑚𝑚𝑚
𝑚𝑚
The weight is calculated as follows:
𝑟𝑟
=
�
𝑈𝑈𝑈𝑈
2
𝑚𝑚𝑚𝑚
�
�
𝑈𝑈𝑈𝑈𝑈𝑈𝑈𝑈
1
𝑚𝑚
�
∗
5
𝑘𝑘𝑟𝑟
By
𝑈𝑈𝑈𝑈
=
𝐶𝐶𝐶𝐶2
𝐷𝐷1𝐷𝐷0
25000
∗
15
𝑚𝑚𝑚𝑚
(standardization to 25000, 15 mV
≙
25000)
and
𝑈𝑈𝑟𝑟𝑟𝑟𝑂𝑂
=
𝐶𝐶𝐶𝐶1
𝐷𝐷1𝐷𝐷0
25000
∗
2.5
𝑚𝑚
(standardization to 25000, 2.5 V
≙
25000)
is
𝑟𝑟
=
𝐶𝐶𝐶𝐶2
𝐷𝐷1𝐷𝐷0
𝐶𝐶𝐶𝐶1
𝐷𝐷1𝐷𝐷0
∗
15
𝑘𝑘𝑟𝑟