Operation Manual

53
ALTITUDE SAMPLING/COMPENSATION
Atmospheric pressure decreases as altitude increases above sea level. Weather systems and ambi-
ent temperature also affect barometric pressures. Consequently, depth reading instruments that do
not compensate for the decrease in pressure indicate depth readings shallower than the depth they
are actually at.
The XR1 automatically compensates for decreased ambient pressure when activated at high alti-
tudes up to 14,000 feet (4,270 meters). Its program contains a high altitude algorithm that reduces
no decompression and oxygen exposure limits to add a larger zone of caution.
The XR1 senses ambient pressure when it is activated, every 15 minutes while it is activated, or
every 30 minutes when it is not activated. At an Altitude of 2,000 feet (610 meters), it will auto-
matically recalibrate itself to measure depth in feet of fresh water rather than feet of sea water. It
will then readjust the no decompression and oxygen limits at additional intervals of 1,000 feet
(305 meters). Therefore, when returning to lower Altitudes, diving should not be conducted until
the unit automatically clears of any residual nitrogen and oxygen loading and resets to operate at
the new lower Altitude.
WARNING: The XR1 will not sense ambient pressures or provide Altitude
compensation when it is wet. DO NOT dive at any different Altitude until the
unit shuts off and is reactivated at the new Altitude. If the unit is activated at
elevations higher than 14,000 feet (4,270 meters), it will perform a diagnostic
check followed by immediate shutdown.
ACCESSORIES (optional items available from your Authorized AERIS Dealer):
 Lens Guard - covers the lens face, prevents scratches
 Battery Kit - includes 1 Battery, 1 Battery Hatch O-ring, Silicone Grease