Grundfos Conex DIA-2 Installation And Operating Instructions Manual page 32

11.5.2 pH and temperature compensation
pH compensation with chlorine measurement
The dissociation of hypochlorous acid (HOCl) into the
-
hypochlorit-anion (OCl ) leads to a loss of slope (loss of
sensitivity) of the sensor for chlorine measuring.
Using a mathematical compensation function, this
loss of sensitivity can be eliminated.
Temperature compensation
Using a compensation function, the influence of
temperature on the measurement can be eliminated
mathematically.
Control field for pH value, pH compensation,
temperature and temperature compensation in
the display of measured value
chlorine
0.43
mg/l
5.20 pH
22 °C
Fig. 27 Chlorine measurement with pH and
temperature compensation
• Press [Esc] once or twice to change to the
display with the measured value.
See sections 11.2 Display elements during initial
commissioning and 11.6.3 Controller control fields
on the display.
In addition to the current measured value, the current
pH value and the temperature of the sample water are
indicated as well.
With activated pH compensation or temperature
compensation, the letter "c" for "compensation" is
displayed at the end of the line.
With deactivated temperature measurement, the water
temperature for compensation should be entered
manually after calibration.
See section 11.9.2 Calibrating the pH
32
11.5.3 Selection of measuring cell
Note
Names of the measuring cells contained in the
software
•
•
•
The measuring cell that corresponds to the selected
measured value can be selected:
•
Monitoring the cleaning motor
(measuring cells AQC-D1/-D11)
Having selected measuring cell type AQC-D1/-D11,
pressH[OK] to get to the "cleaning motor" submenu.
1. Switch the monitoring of the cleaning motor
c Measuring cell AQC-D2/-D12/-D3/-D13 selected
c
Fig. 28
A black bar on the display indicates the actual data
of the water sensor.
See installation and operating instructions for the
potentiostatic measuring cell
AQC-D2/-D12/-D3/-D13.
value.
The "measuring cell" submenu is shown
only if the measured values chlorine,
chlorine dioxide or ozone were selected
during the parameterisation.
AQC-D1/-D11
AQC-D2/-D12
AQC-D3/-D13
AQC-D1/-D11/AQC-D2/-D12/AQC-D3/-D13 with
chlorine, chlorineHdioxide or ozone
on/off.
chlorine
0.43
mg/l
Chlorine measurement with
AQC-D2/-D12/-D3/-D13