Suunto D4 manual Tissue calculation model, Battery

Tissue calculation model:

•Suunto Deep Stop RGBM algorithm (developed by Suunto and Bruce R. Wienke, BSc, MSc, PhD)

•9 tissue compartments

•Tissue compartment halftimes: 2.5, 5, 10, 20, 40, 80, 120, 240 and 480 minutes (on gassing). The off gassing halftimes are slowed down

•Reduced gradient (variable) "M" values based on diving habit and dive violations. The "M" values are tracked up to 100 hours after a dive

•The EAN and oxygen exposure calculations are based on recommendations by R.W. Hamilton, PhD and currently accepted exposure time limit tables and principles

Battery:

•One 3 V lithium battery: CR 2450

•Battery storage time (shelf life): Up to three years

•Replacement: Every two years, or more often depending on dive activity

•Life expectancy at 20°C/68°F:

•0 dives/y –> 2 years

•100 dives/year –>1,5 years

•300 dives/year –>1 year

The following conditions have an effect on the expected battery lifetime:

•The length of the dives

•The conditions in which the unit is operated and stored (e.g. temperature/cold conditions). Below 10°C/50°F the expected battery lifetime is about 50-75% of that at 20°C/68°F

•The use of the backlight and audible alarms

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