Specifications

Ascent Rate Indicator

The Ascent Rate Indicator (Fig. 6a) is provided to help you avoid excessive as-

cent rates by providing a visual representation of ascent speed, rather than

just showing that you are ascending too fast.

The 5 triangular segments of the bar graph, located beside green, yellow, and

red reference zones, appear beginning from the left and may be considered an

ascent rate speedometer. Green is a 'normal' rate, yellow is a 'caution' rate,

and red is 'Too Fast'. The actual speeds that the segments represent are

shown at the left.

When your ascent rate exceeds the maximum recommended rate of 60 feet (18

meters) per minute, the bar graph segments will enter the red zone and all dis-

played segments will flash once per second until your ascent speed is slowed.

When this occurs, you should immediately slow your ascent.

The Ascent Rate Indicator has been granted U.S. Patent No. 5,156,055.

Tank Pressure Bar Graph

Segments of the Tank Pressure Bar Graph(Fig. 6b) appear on the display

when the 500AI is connected to a pressurized cylinder and in the Surface Mode

or Dive Mode. The value of segments is shown at the left.

Fig. 6 - Ascent Rate

Indicator and Tank Pressure

Bar Graph

ARI Segments = Ascent Speed

0 = 0 - 20 fpm (0 - 6 mpm)

1 = 21 - 30 fpm (6.5 - 9 mpm)

2 = 31 - 40 fpm (9.5 - 12 mpm)

3 = 41 - 50 fpm (12.5 - 15 mpm)

4 = 51 - 60 fpm (15.5 - 18 mpm)

5 = 61 + fpm (18.5 + mpm)

(when 5, all segments will flash)

Pressure BG Segments =

• 250 PSI (17.5 BAR) - when below

1000 PSI (70 BAR)

• 500 PSI (35 BAR) - when above

1000 PSI (70 BAR)

140

210

280

350

5000

4000

3000

2000

1000