Hollis Explorer User Manual - page 46
40 |
So, calibration checks, not actual calibrations, should be car-
ried out regularly to ensure the oxygen PPO
2
sensing system
is performing correctly. Calibrations should be done more
sparingly, as it takes time to ensure the correct conditions are
exposed to the sensors. Often a bad calibration causes more
confusing problems than small errors due to temperature
change. User error caused by failure to use the appropriate
ambient gas (air) is a big source of sensor errors.
1. Don't over calibrate
2. If something seems wrong, check everything. Do not just
execute a calibration to fix the reading. You could be making
matters worse.
3. Keep sensors dry.
4. When doing a calibration, do ensure the sensors are ex-
posed to air - force air over the sensors, do not just assume
"they must be exposed to air by now".
5. Just removing hoses is not enough to get air to the sen-
sors. Either the breathing routine described in the Pre-Dive
sequence must be used or the Sensor Module should be re-
moved from the EXPLORER and sensors allowed to stabilize in
ambient air.
6. If the EXPLORER has had a change in climate or significant
ambient conditions, these are good reasons to check calibra-
tion.
7. The readings from the oxygen sensors change with tempera-
ture. If you are diving in warmer or colder water than normal,
PPO
2
readings will vary. Ensure calibrations take place at a
temperature as close to diving conditions as possible.