Oxi 330i/340i
Operation
19
ba52306e04
03/2008
4.3
Calibrating
Why calibrate?
D. O. probes age. This changes the slope of the D. O. probe. Calibration de-
termines the current slope of the probe and stores this value in the instru-
ment.
Thus, you should calibrate at regular intervals.
Separate
calibration of
CellOx 325 and
DurOx 325
The Oxi 330i/340i handheld meter enables the two sensor types, CellOx 325
and DurOx 325, to be calibrated separately from one another. The calibration
of a specific sensor type does not affect the calibration of the other sensor
type. When connecting a sensor, the calibration data stored for the respective
sensor type are automatically used.
Calibration
procedures
The Oxi 330i/340i provides 2 calibration procedures:
z
Calibration in water vapor-saturated air.
To calibrate the CellOx 325, use the OxiCal
®
-SL air calibration vessel (ac-
cessory), to calibrate the DurOx 325, use the OxiCal
®
-D air calibration
vessel (contained in the scope of delivery of the sensor).
z
Calibration via a comparison measurement (e. g. Winkler titration accord-
ing to DIN EN 25813 or ISO 5813). At the same time, the relative slope is
adapted to the comparison measurement by a correction factor.
When to calibrate?
z
After connecting another D. O. probe
z
If the sensor symbol flashes, i. e. after the calibration interval has expired
Setting the
calibration interval
The calibration interval (Int 3) is set to 14 days in the factory. You can select
the interval in the range of 1 ... 999 days.
Printing the
calibration
record (340i)
The calibration protocol contains the calibration data of the current calibration.
You can transmit the calibration protocol to a printer via the serial interface
(see page 33).
8
LoBat
Time
Baud
Day.Month No.
Ident
Year
Sal
%
mbar
1
S
RCL
AR
Store
Auto
Cal
°
F
1/cm
/
K
%
TDS
UpH
Sal
mV/pH
S/
m
cm
cm
M
Lin
Tref25 Tref20
nLF
AutoCal DIN
AutoCal TEC
6
7
1
9 2
7
O
°
C
mg/l
ARng
TP
