Xylem ProLab 2000 - Manual (Page 71)

ProLab 2000 Operation
71 ba75577e05 11/2013
4.8 Dissolved oxygen
4.8.1 General information
You can measure the following variables:
 D.O. concentration
 D.O. saturation index ("D.O. saturation")
 D.O. partial pressure
D.O. measurements with the ProLab 2000 can be carried out using the
D.O. sensors, LFOx1400(-ID), 9009/6.(-ID) or Ox1400Stir(-ID).
The stirrer of the Ox1400Stir(-ID) D.O. sensor has to be supplied with
voltage separately using the NT/pH Mix 540 power supply. The meter
automatically recognizes the type of the connected D.O. sensor.
The meter provides the following functions:
 AutoRange (automatic switchover of the measurement range). If a
measuring range is exceeded, AutoRange causes the meter to
automatically change to the next higher measuring range and back
again. Therefore, the instrument always measures in the measuring
range with the highest possible resolution.
 Stability control to check the stability of the measurement signal.
This ensures the reproducibility of the measuring signal. The display
of the measured parameter flashes until a stable measured value is
available.
Note
Incorrect calibration of D.O. sensors will result in incorrect measured
values. Calibrate at regular intervals.
CAUTION
When connecting an earthed PC/printer, measurements cannot be
performed in earthed media as incorrect values would result.
The RS232 and USB interfaces are not galvanically isolated.
Temperature sensor The D.O. sensor has an integrated temperature sensor that always
measures the current temperature of the test sample.
Preparatory activities Perform the following preparatory activities when you want to measure:
1 Connect the D.O. sensor to the meter.
The D.O. measuring window is displayed.
2 Calibrate or check the meter with the sensor.