120
SWITCHING GAS MIXES (NORM only)
During NORM Dives, the ATOM can be manually switched from GAS 1 to GAS 2 to GAS
3, changing FO2 displays and calculations from the FO2 value set for GAS 1 to the FO2
value set for GAS 2 to the FO2 value set for GAS 3, and if TMTs (Transmitters) are used,
changing Pressure related displays and calculations from TMT 1 to TMT 2 to TMT 3.
NOTE: Switching the ATOM from one GAS (and TMT) to another can-
not be performed while on the surface, and during dives when TMT
2-3 USE is set for Buddy Pressure Check.
Every dive begins with GAS 1. 10 minutes after surfacing from a
multiple gas dive, the ATOM's operation defaults to the GAS 1 FO2.
Access to NORM DIVE Gas Switching screens can only be
accomplished during the time that a NORM DIVE MAIN
screen is being displayed and cannot be performed during
the time that an Alarm is sounding.
NOTE: If a Switch to a new Gas Mix would ex-
pose the diver to a prohibitive PO2 level of 1.60
ATA or greater, the Audible Alarm will sound, the
red LED will flash, and the message DONT >
SWCH will scroll at the top of the display (Fig.
106) until acknowledged by pressing/releasing
the S button momentarily.
Fig. 106 - DON'T SWITCH
GAS ALARM
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