One Point Calibration; Calibration With Two Gases - Pentair HAFFMANS c-DGM Instruction Manual

7.4.2 *One point calibration

LHO sensor
For most applications in the low oxygen measuring range a calibration of the zero point is
sufficient.
To do so follow the instructions as given for the calibration with two gasses. The atmospheric
pressure and the concentration of the high calibration do not have to be entered again.
Therefore skip points 7, 9, 10 and 11 from chapter 7.4.3.
WLO sensor
For most applications in the high oxygen measuring range a calibration of the high calibration
point in air is sufficient.
To do so follow the instructions as given for the calibration with two gasses. Skip point 8 from
chapter 7.4.3.

7.4.3 *Calibration with two gases

Preparation
Additional requirements:
During calibration, both the zero point and a higher calibration point with a defined oxygen
concentration can be calibrated. The calibration gases must be dry gases.
Attention!
The zero point calibration should be performed with a gas which contains 0.001 % O
We recommend that nitrogen or CO
For the high calibration point of the LHO sensor use a gas with a certified oxygen content no
more than 4% and an accuracy of ±1%. Such gases as N
used for this. The high calibration point of the WLO sensor can be calibrated in air. It is
recommended to use dry, oil-free compressed air for this.
Furthermore, the c-DGM must be dry internally during the c-DGM. Rinse the c-DGM for approx.
15 minutes with N
2
ppm (gas) must be used. Because the oxygen sensor measures the partial oxygen pressure,
the oxygen content measured in the gas during calibration depends on the current air pressure.
The manually set actual atmospheric pressure is taken into account while displaying the oxygen
content in the gas units %O
filled in during calibration and will be taken into account while displaying the oxygen content in
the gas units %O , %a.s. or ppm (gas).
2
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Barometer with an accuracy of 1 mbar.
For the WLO sensor a relative humidity measurement with
an accuracy of 1%RV is necessary if the high oxygen
calibration point is to be calibrated in humid gas.
Until software version 2.01 calibration using gases with 100%
humidity. From software version 2.02 calibration using dry
gases.
with a guaranteed purity of 99,999% (Class 5.0) is used.
2
or CO or oil-free compressed air. During calibration the unit %, %a.s. or
2
and %a.s.. With the WLO sensor also the relative humidity can be
2
, &&D E^ 'D 'D
or CO with 4% or 1% O
2 2
or less.
2
can be
2
c-DGM/i-DGM