Altitude Sensing And Adjustment - Aqua Lung i750TC Owner's Manual

• Remove the cover O-ring by squeezing the sides. Discard, and DO NOT attempt to reuse it.
CAUTION: DO NOT use tools to remove the O-ring. To ensure proper sealing, O-ring replacement is
!
required each time the battery is replaced.
REMOVE O-RING
Battery Installation
CAUTION: The O-ring must be a genuine Aqua Lung part that can be purchased from an authorized
!
Aqua Lung dealer. Use of any other O-ring will void the warranty.
• Very lightly lubricate the new O-ring with silicone grease. Install it onto the battery cover. DO NOT roll the O-ring
over the threads, instead stretch it slightly to work it down over the slotted end of the cover into the groove at the
base of the threads.
• Insert a new CR2 lithium 3 volt battery, positive (+) side first, into the battery compartment with the negative end
facing out.
• Ensure that the battery is properly installed and the cover O-ring is evenly seated around the cover.
• Carefully place the cover (with spring) into the housing and turn clockwise slowly by hand to ensure proper
threading.
• Apply a coin and tighten the cover by turning it clockwise until secure. The outer surface of the cover should be
flush with the outer surface of the housing.
INSTALL O-RING

ALTITUDE SENSING AND ADJUSTMENT

Prior to the first dive of a series of repetitive dives, Altitude (i.e., ambient pressure) is measured upon activation of
Dive Surface Mode and every 15 minutes until a dive is made or operation reverts to Watch Mode.
• While it is operating in Watch Mode after a dive, measurements are taken every 15 minutes during the 24 hour
period after surfacing.
• Measurements are only taken when the unit is dry.
• Two readings are taken, the second reading 5 seconds after the first. The readings must be within 1 foot (30 cm)
of each other to record that ambient pressure as the current altitude.
• No adjustments are made during any time that the wet contacts are bridged.
When diving in high altitude waters from 916 to 4,270 meters (3,001 to 14,000 feet), the i750TC automatically
adjusts to these conditions providing corrected depth, and reduced No Decompression and O2 Times at intervals
of 305 meters (1,000 feet).
At an elevation of 916 meters (3,001 feet), Depth calibration automatically changes from feet of seawater to feet
of fresh water. This is the first adjustment to the algorithm. When the Conservative Factor feature is set to ON, No
Decompression Times are calculated based upon the next higher 915 meter (3,000 foot) Altitude. All adjustments
for altitudes greater than 3,355 meters (11,000 feet) are then made to allowable dive times for 4,270 meters
© Aqua Lung International, Inc. (2016)
REPLACE BATTERY
70
REFERENCE
INSTALL COVER
Doc. 12-7852-r05 (8/5/16)