Operation
OX 4000 H
20
ba75853e04
06/2012
Note
The OX 4000 H D.O. meter automatically recognizes the type of con-
nected D.O. sensor (OXY 11).
Temperature sensor
The D.O. sensor has an integrated temperature sensor that always
measures the current temperature of the test sample.
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS232
interface is not galvanically isolated.
5.2.3
Measuring the D.O. concentration
Note
When measuring the concentration of test samples with a salt content
of more than 1 g/l, a salinity correction is required. For this, you have to
measure and input the salinity of the test sample first. This is described
in section 5.2.7 E
NTERING
THE
SALT
CONTENT
(
SALINITY
).
Switch on the salinity correction prior to measuring the D.O. content
(see below).
You can measure the D.O. content without salinity correction as fol-
lows:
Stability control
The stability control function continuously checks the stability of the
measurement signal. The stability has a considerable impact on the
reproducibility of measured values. The [Auto] display flashes until a
stable measured value is available.
1
Perform the preparatory activities according to section 5.2.2.
2
Immerse the D. O. sensor in the test sample.
3
Press the
<MODE>
<>
key repeatedly until the D. O. concen-
tration in
mg/l
appears on the display.
0
5
2
C
°
TP
mg/l
O
Auto
3
6
7
