Owner`s manual

• Depressing the M button for 2 seconds, or if no button is pressed for a period of 2

minutes, operation will revert to the NORM (or GAUG) Surface Main screen.

NOTE: The Serial Number and Firmware Revision will be requested in

the event that you contact TUSA regarding the ZEN. Enter them in the

Records section provided in the back of this Manual.

NORM PLAN MODE

TUSA strongly recommends that you review the Plan Mode dive times

prior to every NORM dive to help you plan your dive as required to avoid

exceeding no decompression or oxygen exposure limits. This is especially

important for repetitive dives when Plan Mode indicates adjusted dive times that are avail-

able for the next dive, based on residual nitrogen or oxygen accumulation (whichever is in

control) following the last dive and surface interval.

NOTE: No Decompression Dive Times in Plan Mode are based on the

FO2 setting for Gas 1. The FO2 setting for Gas 2 is not utilized for

Plan calculations.

• Pressing and releasing the S button momentarily (< 2 sec) while viewing the NORM

Surface Main screen is displayed will access the NORM Plan Lead-in screen.

NOTE: Plan Mode can only be accessed while viewing the NORM

Surface Main screen.