Xylem handylab OX 12 - Manual (Page 18)

Operation handylab Ox 12
18 ba75369e04 01/2011
4.2 Measuring
4.2.1 General information
You can measure the following variables:
z D. O. concentration
z D. O. saturation
z D. O. partial pressure
The measuring instrument is supplied with the following functions:
z AutoRange (automatic measurement range selection),
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 section
4.2.6.
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
sensor
The D. O. probe has an integrated temperature sensor that always measures
the current temperature of the test sample.
Caution
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS232 inter-
face is not galvanically isolated.
1 Connect the D. O. probe to the measuring instrument.
2 In conjunction with the D. O. probe, check or calibrate the measuring
instument. How to calibrate is described in section 4.3.
3 Select the measuring mode with .