Xylem handylab multi 12 - Manual (Page 27)

handylab multi 12 Operation
27 ba75371e03 11/2009
4.3 Dissolved oxygen
4.3.1 General information
You can measure the following variables:
z D. O. concentration
z D. O. saturation
The measuring instrument is supplied with the following functions:
z AutoRange (automatic switchover of the measurement range),
z The AutoRead function (drift control) for checking the stability of the mea-
surement signal. This ensures the reproducibility of the measuring signal.
For details of how to switch the AutoRead function on/off, see page 30.
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.
Preparatory
activities
Perform the following preparatory activities when you want to measure:
Note
Incorrect calibration of D. O. probes will result in incorrect
measured values. Calibrate at regular intervals.
Temperature probe The D. O. probe has an integrated temperature probe that always measures
the current temperature of the test sample.
1 Connect the D. O. probe to the measuring instrument. The in-
strument automatically switches over to D. O. measurement
(O
2
status display).
If the D. O. probe is already connected, press the <M> repeat-
edly until the O
2
status display appears.
2 Calibrate or check the measuring instrument with the sensor.
How to calibrate is described in section 4.3.5 from page 31.
3 Use <
▲> <▼> to toggle between the measuring modes, D. O.
concentration (mg/L) and D. O. saturation (%).