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NOTE:
If an O
deviation of > 1 ppb is observed, then a zero-point calibration is recommended.
2
ONE POINT CALIBRATION
5.2.2
For most applications in the low oxygen measuring range a calibration of the zero point is
sufficient.
To do so follow the instruction as given for the calibration with two gasses. The atmospheric
pressure and the calibration of the high concentration do not have to be entered again. Therefore,
skip point 9 from Section 5.2.3.
CALIBRATION WITH TWO GASES
5.2.3
Preparation:
Extra requirements: Barometer with an accuracy of 1 mbar.
Both the zero point and a high calibration point can be calibrated with a defined oxygen
concentration. The calibration gases must be dry.
The zero-point calibration should be carried out using a gas with a certified oxygen
content of ≤ 0.001%. We recommend the use of nitrogen or carbon dioxide with a purity
of 99.9990% (Class 5.0). The high calibration point for the sensor must be calibrated with
an accuracy of ± 1% using a gas with a certified oxygen content of up to 4%. N
with 4% or 1% O
The inside of the 9065C must be dry during calibration with a gas. Rinse the 9065C for
approx. 15 minutes with N
process, the % unit or the % a.s. unit must be used. Since the oxygen sensor measures the
oxygen partial pressure, the oxygen content measured in the gas during the calibration
process depends on the atmospheric pressure.
The manually entered atmospheric pressure in the "P-atm" parameter in the "Calibration"
menu is taken into consideration when determining the oxygen content in the % O
and the % a.s. unit.
NOTE:
NOTE:
Waltron User Manual
9065C Portable Luminescent Dissolved Oxygen Analyzer
A sodium sulfite solution has to be stored in a closed bottle
due to the consumption of O
can be used for this.
2
or CO
or oil-free compressed air. During the calibration
2
2
Only flush the 9065C using low gas flow speeds. Use a
reduction valve while flushing the 9065C with compressed
air or a calibration gas and adjust the flow to 30 l/h with the
aid of a flow meter.
For an accurate O
calibration or gas inspection, the 9065C
2
must be at the same temperature as the gas. To achieve
this, leave the 9065C and the calibration gas bottles filled
with water for approx. 12 hours at room temperature.
Calibration and Compensation
.
2
or CO
2
2
unit
2
28
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