Calibrating Measured Values; Table 44: Sensor Types; Table 45: Variable Legend - Calibrating Measured Values - WAGO 750-486/040-000 Manual

78 Commissioning
7.2

Calibrating Measured Values

User calibration serves to compensate for tolerances in electrical components.
Calibrate the I/O module by channel to achieve maximum measurement accuracy
for each channel.
User calibration by channel required!
Calibrate separately for each channel.
The following sensor types are specified:

Table 44: Sensor Types

ID Sensor type
1 0 ... 20 mA
2 4 ... 20 mA
3 3.6 ... 21 mA (NAMUR NE43)
The variables in the following equations have the following meaning:
Table 45: Variable Legend – Calibrating Measured Values
Variable
m
b
x1
x2
y1
y2
The "Gain" and "Offset" values are required to perform user-defined calibration.
The calibration gain is the gain factor. The calibration offset is the offset on the y
axis. The following general calibration equation applies:
y = (x + b) × m
The general calibration equation yields the following two equations for calculating
the two values sought:
Calibration gain: m = (y2 – y1) / (x2 – x1)
Calibration offset: b = (y1 / m) – x1
Manual
Version 1.0.0
750-486/040-000 4AI 0/4-20mA NE43 Ex i XTR
Meaning/function
Calibration gain (gain factor)
Calibration offset (offset)
Actual value 1 (analog input current)
Actual value 2 (analog input current)
Setpoint 1
Setpoint 2
WAGO-I/O-SYSTEM 750 XTR