If you carry out the pH value measurement using potential equalisation, then you must adopt
this approach when selecting the measured variable as a parameter.
9.1 Information on the measured
variables
Available measured variables
All measured variables are available
and can be used in the controller.
9.1.1 Measured variable pH [mV]
The measured variable pH [mV]
The pH sensor of the measured variable pH
[mV] is connected using a coaxial cable via
which the mV signal is transmitted to the con‐
troller. This measurement can be used if the
cable is less than 10 metres in length.
Decimal places
The function shows the pH value in the display
with one or two decimal places. An adaptation
of the display to one decimal place makes
sense if a change in the 1/100 value is unim‐
portant or if the value is unsteady.
Factory setting: 2 decimal places
Glass break detection
[ON]
/
[OFF]
: Switches glass break detection of
the pH sensor
[ON]
or
[OFF]
. The factory set‐
ting is
[OFF]
. If the controller has the setting
[ON]
, it displays an error message if an error is
detected.
The function
[Glass break detection]
increases
the safety of the measuring point.
Cable break detection
[ON]
/
[OFF]
: Switches cable break detection
of the coaxial cable
[ON]
or
[OFF]
. The factory
setting is
[OFF]
. If the controller has the setting
[ON]
, it displays an alarm message if an error is
detected.
The function
[Cable break detection]
increases
the safety of the measuring point.
9.1.2 Temperature
Temperature
With amperometric measured variables, the
temperature influence on the measurement is
automatically compensated in the sensor. A
separate temperature measurement is only
used, if necessary, to display and issue the
temperature values via an mA-output. Separate
temperature compensation is only needed with
a chlorine dioxide sensor type CDP.
Configuring measured variables
71
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