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18 Calibrating universal inputs
18.1 Important information
18.2 General information
18.2.1 Calibration methods for universal inputs
Universal inputs can be configured with various operation modes for a number
of different process variables (see table below).
Detailed information on the possible configurations:
v Chapter 10.5.2 "Universal inputs of base unit and optional boards", Page 141
Appropriate calibration routines for each operation mode of a universal input can
be enabled in the calibration default settings.
The following table lists the availability of calibration routines for the individual
operation modes.
Zero-point calibration
This calibration method is used to determine the pH zero point on a measure-
ment characteristic curve. The slope is retained.
A test solution with a defined value of the respective process variable is needed
as a reference.
Slope calibration
This calibration method is used to determine the slope of a measurement char-
acteristic curve. The zero point is retained.
A test solution with a defined value of the respective process variable is needed
as a reference.
WARNING!
During the calibration, the relays and analog output signals assume the config-
ured states! The response of the output signals is set for each output in its "Re-
sponse at calibration" configuration point.
⇨ Chapter 10.5 "Analog inputs", Page 139
linear
scaling
Temp. mea-
surement
pH value
measure-
ment
Conductivity
measure-
ment
free chlorine,
ph/T-com-
pensated
Zero-point calibration X X
Slope calibration X X
Two-point calibration X X
Rel. cell constant X
Temperature coefficient X
TC-curve X
Universal input
Operation modes
Calibration
routine
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