Measured variable: TDS value
Symbol displayed in the controller's display:
[TDS]
(total dissolved solids)
Unit of measurement: ppm (mg/l)
Physical variable: Total of all inorganic and
organic substances dissolved in a solvent
Display range: 0 …. 9999 ppm
Temperature range: 0 … 35 °C
[TLIMIT↑]
: ≤ 40 °C
Setting the TDS value displayed: You can set a
multiplicative factor
[TDS]
in the menu, with
which the TDS value displayed can be
changed:
Displayed TDS value
[ppm]
= К (25 °C)
[uS/cm]
* TDS factor
Setting range of TDS factor: 0.400 … 1.000
(Default: 0.640)
Temperature compensation is always linear on
the TDS display with a reference temperature
of 25 °C.
Measured variable: Salinity (SAL)
Symbol displayed in the controller's display:
[SAL]
units: ‰ (g/kg)
Physical variable: Mass of salts in one kg of
water given in PSU (practical salinity units).
The salinity is derived from the conductivity
measured, with a specified non-linear tempera‐
ture compensation and a reference conductivity
(KCL).
Display range: 0 …. 70.0 ‰
Temperature range: 0 … 35 °C
[TLIMIT↑]
: ≤ 35 °C
The salinity
[SAL]
is calculated based on the
[Practical Salinity Scale 1978 (PSS-78)]
9.1.11 Temperature
[mA]
, (as
main measured variable)
Measured variable temperature [mA], (as main
measured variable):
For the measured variable
‘Temperature [mA]’
use of a DMTa temperature measuring trans‐
ducer or a Pt100V1 measuring transducer is
prerequisite. The measuring range is:
0 ... 100 °C. A temperature sensor cannot be
connected directly to the controller.
9.1.12 mA general
Measured variable [mA general]
With the
[mA general]
measured variable, var‐
ious preselected measured variable can be
selected and/or one measured variable can
also be freely edited with its unit of measure.
The temperature measurement cannot be used
for compensation purposes, because the influ‐
ence of the temperature measurement on the
measured value is not known. In principle, the
settings are performed in the same way as with
the other measured variable. A standardised
calibrated signal is expected by the controller
from each connected device
9.1.13 Features of the two-
channel version
Two channel version
If a second measuring channel is available
(dependent on the identity code, channel 2),
then this second measuring channel can be
configured according to the descriptions of the
first measuring channel.
Configuring measured variables
79
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