User manual SUUNTO HELO 2

[. . . ] EN HelO2 USER'S GUIDE Tank Pressure Bar Graph Gas Mix Selection O2% | He% (Mixed Gas Mode) (Mixed Gas Mode) (Mixed Gas Mode) 1. WELCOME TO THE WORLD OF SUUNTO DIVING INSTRUMENTS . . . . . . . . . . . . . . . . Using HelO2 with Dive Manager and Dive Planner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WARNINGS, CAUTIONS, AND NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] It includes: · the time needed at the deep stop · the time needed to ascend to the ceiling at an ascent rate of 10 m/33 ft per minute. The ceiling is the shallowest depth to which you should ascend · the time needed at the ceiling · the time needed at the Mandatory Safety Stop (if any) · the time needed to reach the surface after the ceiling and Safety Stops have been completed WARNING YOUR ACTUAL ASCENT TIME MAY BE LONGER THAN DISPLAYED BY THE INSTRUMENT!The ascent time will increase if you: · remain at depth · ascend slower than 10 m/33 ft per minute · make your decompression stop deeper than at the ceiling · do not use optimal decompression gas These factors will also increase the amount of gas required to reach the surface. Ceiling, ceiling zone, floor and decompression range When in decompression, it is important that you understand the meaning of ceiling, floor, and decompression range. · The ceiling is the shallowest depth to which you should ascend when in decompression. At this depth, or below, you must perform all stops · The ceiling zone is the optimum decompression stop zone. It is the zone between the minimum ceiling and 1. 2 m/4 ft below the minimum ceiling · The floor is the deepest depth at which the decompression stop time will not increase. Decompression will start when you pass this depth during your ascent · The decompression range is the depth range between the ceiling and floor. Within this range, decompression takes place. However, it is important to remember that the decompression will be very slow at, or close to, the floor The depth of the ceiling and floor will depend on your dive profile. The ceiling depth will be fairly shallow when you enter the decompression mode, but if you remain at depth, it will move downward and the ascent time will increase. Likewise, the floor and ceiling may change upwards while you are decompressing. When conditions are rough, it may be difficult to maintain a constant depth near the surface. In such cases, it is more manageable to maintain an additional distance below the ceiling, to make sure that the waves do not lift you above the ceiling. Suunto recommends that decompression takes place deeper than 4 m/13 ft, even if the indicated ceiling is shallower. NOTE It will take more time and more gas to decompress below the ceiling than at the ceiling. 29 WARNING NEVER ASCEND ABOVE THE CEILING!You must not ascend above the ceiling during your decompression. In order to avoid doing so by accident, you should stay somewhat below the ceiling. Display below the floor The blinking ASC TIME and an upward pointing arrow indicate that you are below the floor. The ceiling depth is shown on the left side, and the minimum total ascent time on the right side, of the center window. Below is an example of a decompression dive above Deep Stops, below the floor. UPWARD POINTING ARROW, BLINKING ASC TIME AND AN ALARM TELL YOU TO ASCEND. MINIMUM TOTAL ASCENT TIME INCLUDING MANDATORY SAFETY STOP IS 15 MINUTES. CEILING IS AT 3 M. Display above the floor When you ascend above the floor, the ASC TIME display stops blinking and the upward pointing arrow disappears. Below is an example of a decompression dive above the floor. UPWARD POINTING ARROW HAS DISAPPEARED AND ASC TIME LABEL HAS STOPPED BLINKING, MEANING YOU ARE IN THE DECOMPRESSION RANGE. Decompression will now begin, but is very slow. [. . . ] The contingency partial pressure limit is 1. 6 bar. Dives beyond this limit risk immediate oxygen toxicity. It is a form of congenital heart defect that enables blood flow between the left and right atria via the interatrial septum. Abbreviation for oxygen partial pressure. [. . . ]