Measured Variable Ph [Ma] - ProMinent DULCOMETER diaLog DACb Assembly And Operating Instruction

Configuring measured variables
Temperature compensation
This function is used for compensation of the
temperature influence on the measurement.
This is only necessary with pH and fluoride
measurement and when chlorine dioxide is
measured using a CDP sensor.
Temperature: [Off] / [Manual] / [Automatic]
[Off] switches the process temperature
n
setting off
[Manual] enables the process temperature
n
to be manually specified, which makes
sense with constant temperatures
[Automatic] uses a measured process tem‐
n
perature. Automatic measurement of the
temperature using the temperature sensor,
e.g. Pt1000. With pH, temperature com‐
pensation can be switched
in the menu.
72
9.1.3

Measured variable pH [mA]:

If the measured variable
measurement using a mA signal, is selected,
then the possibility of sensor monitoring for
cable or glass breaks is no longer available.
For a pH measurement using a mA signal,
either a DMTa or a pH-V1 measuring trans‐
ducer is connected to the pH sensor. A 2-con‐
ductor connection cable is used between the
DMTa-/pH-V1 measuring transducer and the
controller. The connection cable supplies the
DMTa-/pH-V1 measuring transducer and routes
the measured value as a 4 ... 20 mA signal to
the controller.
When using the DMTa measuring transducer or
[ON] or [OFF]
the measuring transducer of another supplier,
the measuring range allocation must be set to
the following values:
n
n
With a pH-V1 measuring transducer, the setting
of the measuring range allocation is automati‐
cally specified.
Temperature compensation
This function is used to compensate for the
temperature influence on the measurement.
The process temperature is set in the DMTa
measuring transducer when using a DMTa
measuring transducer
Temperature: [Off] / [Manual] / [Automatic]
n
n
n
Measured variable pH [mA]
'pH [mA]' , i.e. pH
4 mA = 15.45 pH
20 mA = -1.45 pH
[Off] switches the process temperature
setting off
[Manual] permits manual process tempera‐
ture setting
[Automatic] uses a measured process tem‐
perature