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. Using HelO2 with Dive Manager and Dive Planner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WARNINGS, CAUTIONS, AND NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SUUNTO HelO2 AT A GLANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Ascent rate indicator The ascent rate is shown graphically along the right hand side. When the maximum allowed ascent rate is exceeded, the lower segments start to blink with the top segment staying solid, indicating that the maximum ascent rate has been exceeded continuously or that the current ascent rate is significantly above the allowed rate. ACTIVATED BACKLIGHT, ALARM AND A BLINKING ASCENT RATE BAR GRAPH INDICATE YOU ARE ASCENDING FASTER THAN 10 M/MIN. YOU ARE ADVISED TO MAKE A MANDATORY SAFETY STOP WHEN YOU REACH A DEPTH OF 6 M. NORMAL ASCENT RATE. WARNING DO NOT EXCEED THE MAXIMUM ASCENT RATE!You should always make the Mandatory and Recommended Safety Stops after you have exceeded the maximum recommended ascent rate. If this Mandatory Safety Stop is not completed, the decompression model will penalize your next dive(s). Continuous ascent rate violations will result in Mandatory Safety Stops. When Recommended Deep Stop is enabled, the length is indicated in seconds. 6. 1. 4. Safety Stops A 3 minute Recommended Safety Stop is prompted after every dive to over 10m. Decompression dives When your NO DEC TIME becomes zero, your dive becomes a decompression dive so you must perform one or more decompression stops on your way to the surface. The NO DEC TIME on your display will be replaced by an ASC TIME, and a CEILING notation will appear. If you exceed the no-decompression limits on a dive, the dive computer will provide the decompression information required for ascent. After this, the instrument will continue to provide subsequent interval and repetitive dive information. Rather than requiring you to make stops at fixed depths, the dive computer lets you decompress within a range of depths (continuous decompression). 28 The ascent time (ASC TIME) is the minimum amount of time needed to reach the surface in a decompression dive. 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. 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. [. . . ] Standard mixes are EAN32 (NOAA Nitrox I = NN I) and EAN36 (NOAA Nitrox II = NN II). The deepest depth during a decompression stop dive at which decompression takes place. After a change in ambient pressure, the amount of time required for the partial pressure of nitrogen in a theoretical compartment to go half way from its previous value to saturation at the new ambient pressure. A single or repetitive dive that includes time spent at various depths and whose no decompression limits are therefore not determined solely by the maximum depth attained. [. . . ]