Hollis Explorer User Manual - page 46
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!
DANGER: Always be careful when doing manual calibrations. The
oxygen sensors must be exposed to air and NO OTHER GAS.
Oxygen sensor calibrations conducted once a week should be more
than sufficient, unless the EXPLORER has been transported to different
climates, locations, or significantly different ambient conditions.
Prior to starting a pre-dive sequence it is advisable to check the oxygen
and CO
2
sensor (if equipped) calibration by opening the EXPLORER
Module and removing it and the Sensor Module. Place the two together
and turn the unit on. Then go to the STATUS screen and view the PO
2
and CO
2
readings.
! WARNING: If the PO
2
is not 0.21 and the CO
2
(if equipped) is not 0.3-
0.4
, then a calibration must be performed.
Recommendations
• Never store sensors for long periods of time before
use; they have expiration dates.
• Never subject sensors to high temperatures i.e. (inside
cars, garages etc.).
• Never freeze sensors (left in cars overnight).
• Never subject sensors to physical shocks.
• Never subject sensors to vacuum.
• Never submerge sensors in liquids.
• Never attempt to open a sensor. They contain a caustic
chemical.
• Sensors deteriorate very slowly and near the end of
their useful life may show a drift soon after calibration.
• The oxygen sensors must be replaced every 12 months
or at their ‘do not use after’ date or sooner depending
on the pp02 they are stored in and the hours of use.
• Oxygen sensor usage temperatures are:
- Operating temperature range 0 – 40
°C / 32 - 104 °F
- Storage temperature -20 to +50
°C / -4 - 122 °F
- Recommended storage temperature +5 to +15
°C / 41
°F to 59 °F