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WITT-GASETECHNIK GmbH & Co KG
Salinger Feld 4-8
: +49 (0)2302 89010 www.wittgas.com
Gas safety & process technology
D-58454 Witten,
Germany
Fax: +49 (0)2302 89013 [email protected]
9 Calibration
The OXYBABY
®
has to be calibrated at regular intervals.
For the majority of applications a weekly calibration will be sufficient, however, for more ac-
curate test results, it is advisable to run a calibration before starting an actual test.
Changes to the ambient conditions (e.g. powerful vibrations during transit or significant
changes in temperature) then require calibration to be performed!
Make sure that the device is stable during each calibration process.
For accurate test results we advise calibrating the O
2
sensor first and then the CO
2
sensor.
Calibration of the OXYBABY
®
is conducted in four stages:
calibration of the zero point for O
2
analysis.
(Recommended is 100 per cent by volume N
2
or argon)
calibration of the zero point for CO
2
analysis.
(Recommended is 100 per cent by volume N
2
or argon)
calibration of the calibration point for O
2
analysis.
calibration of the calibration point for CO
2
analysis.
(Recommended is 100 per cent by volume CO
2
)
In the "calibration" menu (see Program options Chapter 8.9):
select the desired calibration process using
and
and start with
.
The upper bar in the display flashes on and off as long as the calibration process is active. Once
the calibration process has finished, an acoustic signal is sounded and the upper line of the display
stops flashing.
Caution!
For all measuring and calibration processes make sure that the measuring cell in the OXY-
BABY
®
does not have pressure applied to it. The gas to be analysed must always be aspi-
rated by the integrated pump at atmospheric pressure (= ambient pressure).
Do not suck in any fluids!
Non-observance of this may result in incorrect measurements, or damage to the device.
9.1
Calibrating zero point (O
2
or CO
2
)
Do not use CO
2
as a zero gas to calibrate the zero point of the O
2
sensor. Non-observance of
this may result in incorrect measurements.
To calibrate the zero point – for each gas – use a suitable zero gas cylinder (see Technical da-
ta), install a pressure regulating valve at the zero gas cylinder and then connect a protective
sleeve or a piece of loose hose to the pressure regulating valve's outlet side.
Allow the gas to flow freely at as low a pressure and flow rate as possible through the hose to
the environment.
Only after the pressure regulating valve/hose system has been sufficiently rinsed (to displace the
ambient air):
hold the needle in the OXYBABY
®
in the hose so that the flowing gas can be sucked-in. Then
start the calibration with
.
Insert the needle far enough into the hose to ensure that gas does not accumulate in the
hose and pressure is not built up!
Keep the needle in the hose until the calibration process has been completed.
Wait until an acoustic signal is sounded.
The OXYBABY
®
automatically accepts the calibration value. At the same time, the display is cor-
rected to 0.0 % if necessary.
Summary of Contents for OXYBABY 6
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