DEPOLOX® 400 M
6. Operation
67
EN
5 To enable the calibration check interval,
set the parameter “Message” to “On”
under the heading Calibration and, under
“Interval,” enter the number of days after
which you wish to receive a reminder to
carry out sensor calibration.
When the set interval expires, the disin-
fection analyzer generates an orange mes-
sage reminding you to carry out sensor
calibration. The message can be acknow-
ledged via the message system.
To reset the calibration check interval,
carry out sensor calibration or, in the case
of premature calibration, tap the “Exe-
cute” button under the heading “Calibrat-
ion” to reset the calibration interval. The
date for the next calibration is recalcula-
ted and displayed under “next mainte-
nance on.”
6.6.2 Calibration Disinfection (DES sensors)
During calibration on the 3-electrode cell (flow
cell), a zero point calibration and a measured
value calibration (DPD1) must be carried out.
Zero point calibration
1 Press the
symbol.
2 Press the
Calibration menu.
3 Tap the measured value “Disinfection.”
4 Tap “+” for zero point calibration, and the
display for the extended calibration menu
opens.
5 Press the “Zero point“ parameter.
6 Close the ball valve on the sample water
inlet.
7 Wait until the displayed value no longer
changes.
8 Press the “Calibration” button. An input
field opens.
9 Press "Enter" to save the zero point.
10 Open the ball valve on the sample water
inlet.
Measuring value calibration (DPD)
11 After zero point calibration, wait at least 2
minutes.
12 Open the flow cell drain valve by approxi-
mately 1 turn and extract a specimen of
the sample water.
13 Determine the disinfectant content in the
sample using a photometer.
14 Press the parameter “DPD.”
15 Press the “Calibration” button. An input
field opens.
16 Use the input keys to enter the determi-
ned value.
17 Press "Enter" to save the entry.
This concludes the calibration for DPD.
6.6.3 pH calibration
1 Press the symbol.
2 Press the
Calibration menu.
3 Tap the measurement “pH.”
4 Tap “+” for calibration with pH buffer
solution, and the display for the extended
calibration menu opens. Otherwise, conti-
nue under “Offset alignment.”
NOTICE
To prevent non-permissible control signals
being output during calibration, the "Hold
function" in the system menu should be set
to "On". mA-outputs and controller outputs
then remain constant as long as a calibrat-
ion menu is open.
NOTICE
If there are deviations in the zero point, a
zero point calibration must be carried out.
NOTICE
When the sample water supply has been
stopped, the display first drops rapidly, and
after approximately one minute slowly
approaches zero. During first commissio-
ning, it is essential to wait for 5 minutes,
even if the display shows “0.00” or flashes
after a few seconds.
NOTICE
During pH calibration with pH buffer solu-
tion, the buffer solution and the sample
water must have the same temperature. If
there is a temperature difference of > 9 °F
(> 5 °C), first bring the buffer solution to the
same temperature as the sample water. Also
observe the calibration values of the buffer
solution at different temperatures.
