8.1
Information on the measured
variables
Existing measured variables
All possible measured variables are
available in the controller and can be
used.
8.1.1 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 trans‐
mitted to the controller. 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 unimportant or if the value
is unsteady.
Factory setting: 2 decimal places
Glass break detection
[ON]
/
[OFF]
: Switches glass break detec‐
tion of the pH sensor
[ON]
or
[OFF]
. The
factory setting 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 detec‐
tion of the coaxial cable
[ON]
or
[OFF]
.
The factory setting is
[OFF]
. If the con‐
troller 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.
8.1.2 Temperature
Temperature
With amperometric measured variables,
the temperature influence on the meas‐
urement is automatically compensated in
the sensor. A separate temperature meas‐
urement is only used, if necessary, to dis‐
play and issue the temperature values via
an mA-output. Separate temperature com‐
pensation is only needed with a chlorine
dioxide sensor type CDP.
Temperature compensation
This function is used for compensation of
the temperature influence of the process
on measurement.
Temperature: [Off] / [Manual] / [Automatic]
n
[Off]
switches the process tempera‐
ture setting off
n
[Manual]
makes possible a manual
specification of the process tempera‐
ture
n
[Automatic]
uses a measured process
temperature. Automatic measurement
of the temperature using the tempera‐
ture sensor, e.g. Pt1000. For pH,
CDP and fluoride, temperature com‐
pensation can be switched
[ON]
or
[OFF]
in the menu.
Setting measured variables
54
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