VR Technology Limited
Oxygen Sensors
Galvanic oxygen sensors and their connection systems are affected by many
environmental conditions and this must be taken into account when using an oxygen
analyser or rebreather.
These conditions include:
1. Temperature
2. Moisture
3. Electrical noise (proximity of power sources and RF interference)
4. Connector corrosion
5. Flow rate (hence partial pressure)
Therefore, it is not unusual to notice small ‘drifts’ while calibrating or using the units.
While an ideal calibration in air should read between 20.8% and 21% oxygen, it is not
unusual to see momentary shifts due to the above. Many oxygen cells, if unused for a
period, appear to benefit from a flow of an oxygen enriched gas prior to calibration
and use.
To use the VR as an Oxygen Analyser purchase the ‘Quick-ox’ cylinder connection
kit and I/O cable package, (our product code for the package is C8b).
The standard Teledyne cell recommended for use with the VR analyser cable is the
R17 with a 3.5 mini jack connection system.
Care must be taken to ensure that the cable end connector is correctly inserted all the
way into the cell and does not disconnect during use. Occasionally corrosion may
occur on both the cable end and cell connector and it may be necessary to rotate the
connector in the cell to clean off any build-up. The symptoms of the presence of
corrosion can be an incorrect (unstable) reading after calibration or seen as a moving
FO2 as the connector is rotated.
The R17 is also the cell used with our rebreather cable packages.
The cell used with the C8a Draeger rebreather cable package is the R22 with a molex
connector.
VR Dive Computer Operations Manual 2009 rev E 28/01/2009
68
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