6. Operation
DEPOLOX® 400 M
68
EN
pH 7 alignment
5 Press the “pH 7” parameter.
6 Close the sample water inlet and sample
water outlet and briefly open the flow cell
drain valve to release the pressure. Close
the flow cell drain valve again.
7 Place the beaker in the bottom clip and fill
with buffer solution "pH 7.00" or clamp
the bag with buffer solution "pH 7.00" in
the bottom clip.
8 Unscrew and remove the pH sensor from
the cell body cover.
9 Dip the pH sensor through the top clip at
least 2 cm deep into the buffer solution
and move slightly until the indicated pH
value remains constant.
10 Press the “Calibration” button. An input
field opens.
11 Use the input field to enter the value to
be calibrated for the buffer solution.
12 Press "Enter" to save the entry.
pH X-span alignment
13 Remove the buffer solution “pH 7.00”
from the bottom clip.
14 Wash the pH sensor in distilled water to
prevent carryover of buffer solution.
15 Press the “pH X” parameter.
16 Place the beaker in the bottom clip and fill
it with buffer solution "pH 4.65" or clamp
a bag with buffer solution "pH 4.65" in the
bottom clip.
17 Dip the pH sensor at least 2 cm deep into
the buffer solution and move gently until
the indicated pH value remains constant.
18 Press the “Calibration” button. An input
field opens.
19 Use the keypad to enter the value to be
calibrated.
20 Press "Enter" to save the entry.
21 Remove the pH sensor from the top clip.
22 Screw the pH sensor into the cell body
cover.
23 Open the sample water inlet and outlet
again.
The pH measurement has now been calibra-
ted.
Offset alignment
If there is a difference between the displayed
pH value and a pH value measured manually,
this difference can be compensated for and
the comparative value entered in the Offset
menu.
1 Press the symbol.
2 Press the
Calibration menu.
3 Tap the “pH” measurement.
4 Press the “Offset” parameter
5 Use the keypad to enter the value from
the comparative measurement.
6 Press "Enter" to save the entry.
This concludes the pH offset.
6.6.4 ORP calibration (Redox)
1 Press the symbol.
2 Press the
Calibration menu.
3 Select the “ORP” measurement menu.
4 Press the parameter “Cal. value”.
5 Place the beaker into the bottom clip and
fill it with calibration solution "478 mV" or
clamp a bag with calibration solution "478
mV" into the bottom clip.
6 Close the sample water inlet and sample
water outlet and briefly open the sample
extraction unit (drain) to release the pres-
sure. Close the sample extraction unit
(drain) again.
7 Unscrew the ORP sensor into the cell
body cover.
8 Dip the ORP sensor through the top clip at
least 2 cm deep into the calibration solu-
tion and move it slightly until the indica-
ted pH value remains constant.
9 Press the “Calibration” button. An input
field opens.
10 Use the keypad to enter the value to be
calibrated.
11 Press "Enter" to save the entry.
NOTICE
If buffer solutions other than those stated
are used, the pH value of the buffer solution
must be lower than pH 6 or higher than pH
8.
NOTICE
The offset calibration is deleted each time a
new pH-7 alignment or span alignment is
performed with the pH buffer solution.
NOTICE
ORP (Redox) sensors have long running-in
times. This means that after calibration with
calibration solution, it can take several
hours for the measured value to stabilize..
