Tusa iq-650 element computer manual 12-2917-r02

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CONTROL OF DISPLAYS

During dives, there is a Main (default) Display with Alternate

screens of information that can be accessed temporarily by

pressing the button.

NO DECOMPRESSION DIVE MODE

The Element will enter the No Decompression Dive Mode when

you descend to 5 FT (1.5 M) for 5 seconds.

No Deco Dive Main Display (Fig. 28)

Information includes Dive Time Remaining with Mode icon (Fig.

28a), Elapsed Dive Time (Fig. 28b), Current Depth (Fig. 28c),

and applicable bar graphs.

•  Press/release the button 1 time (< 2 seconds) to view No

Deco Dive Alternate 1 Display.

•  If set for Nitrox, press/release the button while viewing

Alternate 1 to view Alternate 2.

•  The Alternate Displays will revert to the Main after 5 seconds

unless the button is pressed.

•  Depress the button for 2 seconds to view a No Deco Deep

Stop Preview screen for 5 seconds.

No Deco Alternate 1 Display (Fig. 29)

Information includes Temperature, Time of Day, and Max Depth

with icons.

Fig. 28  - NO DECO MAIN

a

c

b

Fig. 29  - NO DECO ALT 1

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No Deco Alternate 2 Display (Fig. 30)

The ALT 2 display will not appear when FO2 is set for AIR.

Information includes the graphic FO2, current value of PO2 with

graphic PO2, and the FO2 value set (21 to 50).

No Deco Dive DEEP STOP

On any No Deco dive in which Depth exceeds 80 FT (24 M), a

Deep Stop Preview screen (Fig. 31) can be accessed that will

display the graphic DS (meaning Deep Stop) and a recom-

mended Stop Depth of 1/2 the Max Depth and Stop Time of

02:00 (2 minutes) with DS and STOP bar icons.  It will revert to

the Main after 5 seconds.

•  To access the Preview screen, depress the button for 2

seconds while viewing the No Deco Main screen.

•  The intent of this screen is to suggest that a stop should be

made to help reduce tissue loading prior to final ascent.

•  The Preview screen will not be available for display once

you ascend above the calculated Stop Depth.

NOTE:  The Deep Stop is not required and although

recommended, it does not have to be taken.  There

will be no penalty if the Stop is ignored and ascent

(or other activity) is continued.

Fig. 30  - NO DECO ALT 2

Fig. 31  - NO DECO DEEP

STOP PREVIEW

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Upon ascending to within10 FT (3 M) below the Stop Depth, the

Deep Stop Main screen (Fig. 32) will automatically appear

displaying the Stop Depth (1/2 Max Depth) with the 2 minute

Countdown Timer that counts down from 02:00 to 0:00

(min:sec).  Also displayed will be Dive Time Remaining, current

Depth and applicable bar graphs.

Press and release the button (< 2 seconds) to access the ALT 1

screen that displays Elapsed Dive Time (Fig. 33), press it again

to view the ALT 2 screen displaying Temperature, Time, and

Max Depth (similar to figure 29), then if a Nitrox dive press it

again to view ALT 3 displaying FO2 and PO2 (similar to figure

30).

>  If you descend 10 FT (3 M) below, or ascend 10 FT (3 M)

above, the calculated Stop Depth for 10 seconds during the

countdown, the No Deco Main will replace the DS Main

display and the DS feature will be disabled for the

remainder of that dive.

>  In the event that you enter Deco, exceed 190 FT (57 M), or

a High O2 condition (=> 80%) occurs, the DS will be

disabled for the remainder of that dive.

>  The DS is disabled during a High PO2 Alarm condition

(when => Set Point).

Fig. 32  - DEEP STOP MAIN

Fig. 33  - DEEP STOP ALT 1

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No Deco Dive SAFETY STOP (Fig. 34)

Upon ascending to 20 FT (6 M) on any No Decompression dive

in which Depth exceeded 30 FT (9 M), a Safety Stop screen will

appear displaying a recommended Stop at 15 FT (4.5 M) with a

3 minute Countdown Timer that counts down from 03:00 to

0:00 (min:sec).

The Safety Stop will be displayed until the countdown times out,

or you descend below 30 FT (9 M) during the countdown, or

you surface during the countdown.

•  Like the Deep Stop, there is no Penalty for surfacing prior to

completing the Safety Stop.

•  There is no Preview screen associated with the Safety Stop.

Safety Stop Main display information includes Dive Time Remain-

ing with Mode icon, Stop Depth (15 FT or 4.5 M), STOP bar

icon, Countdown Timer, Current Depth, and applicable bar

graphs.

•  Alternate displays are similar to those previously described

for the Deep Stop.

Fig. 34  - NO DECO SAFETY

STOP MAIN

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DECOMPRESSION DIVE MODE

The Element is designed to help you by providing a representa-

tion of how close you are to entering decompression.  Decom-

pression Dive Mode activates when theoretical No Decompres-

sion time/depth limits are exceeded.

Upon entering Decompression Mode, the Mode icon will change

from No Deco to Deco (Fig. 35a).

•  The UP Arrow and Deco STOP bar icons will flash until you

are within 10 FT (3 M) of, and below, the required Stop

Depth, then both arrow icons and the bar icon appear solid.

To fulfill your decompression obligation, you should make a safe

controlled ascent to a depth (Fig. 36a) slightly deeper than, or

equal to, the required Stop Depth indicated (Fig. 36b) and

decompress for the Stop Time indicated (Fig. 36c).

Total Ascent Time (Fig. 36d) includes Stop Times for all required

decompression ceilings and vertical Ascent Time calculated at

60 FPM (18 MPM) for depths deeper than 60 FT (18 M), and

30 FPM (9 MPM) for depths of 60 FT (18 M) and shallower.

Fig. 36 - DECO STOP MAIN

Fig. 35 - ENTRY into DECO

a

b

c

a

d

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