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3.7.4. SWITCHING FROM APNEA TO SCUBA
It is commonly accepted that scuba diving
after apnea diving is safe, but we take a
slightly more conservative approach. Smart
Air evaluates your apnea activity and imposes
a restriction before you can switch the dive
computer from apnea to scuba based on your
max depth in apnea in the preceding 24 hours:
- up to 5m/15ft: no restriction
- up to 10m/33ft: 2-hour restriction since the
last apnea dive
- up to 20m/66ft: 4-hour restriction since the
last apnea dive
- up to 30m/100ft: 6-hour restriction since the
last apnea dive
- over 30m/100ft: 8-hour restriction
• 4. TAKING CARE OF SMART AIR
4.1. TECHNICAL INFORMATION
Pressure gauge function
The pressure gauge integrated in the Smart
Air dive computer has been tested and CE
certified by RINA, notified body 0474, located in
Genova, Italy.
The pressure gauge is a Category III device as
defined under European Regulation 2016/425,
and complies with the specifications set out in
the harmonized European Standard EN250 for
use with air compliant with Standard EN 12021
(oxygen content of 21%).
The EC certification process and verification
of the operating performance of the pressure
gauge in the Smart Air dive computer under
standards EN250 are understood to be
applicable to a maximum depth of 50 m below
the surface.
The Smart Air dive computer can be used in
cold water (water at temperatures below 10°C).
Marking
The instrument markings are located on the
tank module, and consist of the following:
• working pressure rating: 300 bar / 4,350 psi;
• reference standard: EN250;
• reference marking: CE 0474.
The conformity marking indicates compliance
with the essential health and safety
requirements as per European Regulation
2016/425. The number alongside CE identifies
RINA, notified body 0474, located in Genova,
Italy, authorized to inspect the finished product
under Module D of European Regulation
2016/425.
Operating altitude:
- with decompression – sea level to
approximately 3700m/12100ft
- without decompression (gauge mode) – at
any altitude
Decompression model: RGBM Mares-Wienke
(10 tissues)
Depth measurement:
- Max displayed depth: 150m/492ft
- Resolution: 0.1m until 99.9m and 1m at
depth deeper than 100m. Resolution in ft is
always 1ft
- Temperature compensation of the
measurement between -10 °C to +50 °C /
14°F to 122 °F
- Accuracy from 0 to 80m/262ft: 1% ±0.2m/1ft
Temperature measurement:
- Measurement range: -10 °C to +50 °C /
14°F to 122 °F
- Resolution: 1 °C / 1 °F
- Accuracy: ± 2 °C / ± 4 °F
Clock: quartz clock, time, date, dive time
display up to 999 minutes
Oxygen concentration: adjustable between 21%
and 99%, ppO
2
max range between 1.2 and 1.6bar
Logbook memory: 95hours of dive profile at
5-second sampling rate
Operating temperature: -10 °C to +50 °C /
14°F to 122 °F
Storage temperature: -20 to 70 °C / -4 to 158°F
Display:
- Diagonal: 31 mm / 1 1/4"
- Mineral glass
Power supply:
- CR2450 user-replaceable battery
- battery life: 100-150 dives. Actual battery
duration depends on the usage of the
backlight and the water temperature.
4.2. MAINTENANCE
The tank pressure gauge and the parts of this
product used to measure tank pressure should
be serviced by an authorized Mares dealer
every other year or after 200 dives (whichever
comes first). In addition, the depth accuracy
should be verified by an authorized Mares
dealer every two years Aside from that, Smart
Air is virtually maintenance free. All you need
to do is rinse it carefully with fresh water after
each dive (avoid any chemical products) and
replace the battery when needed. To avoid
possible problems with your Smart Air, the
following recommendations will help assure
years of trouble free service:
- avoid dropping or jarring your Smart Air;
- do not expose Smart Air to intense, direct
sunlight;
- do not store Smart Air in a sealed container,
always ensure free ventilation.
NOTE
If you notice signs of moisture on the inner
wall of the mineral glass, take your Smart
Air immediately to an authorized Mares
service center.
WARNING
The mineral glass is not exempt from
scratches resulting from improper use.
WARNING
Do not blow compressed air onto Smart
Air, because it could damage the pressure
sensor area.
4.2.1. REPLACING THE BATTERY IN SMART AIR
WARNING
REPLACING THE BATTERY IS A VERY
DELICATE OPERATION, AND WHEN
PERFORMED BY AN INEXPERIENCED
PERSON MOST LIKELY WILL LEAD TO A
FLOODED COMPUTER. WE STRONGLY
RECOMMEND THAT YOU VISIT AN
AUTHORIZED MARES CENTER. MARES
DECLINES ALL RESPONSIBILITY FOR ANY
DAMAGE CAUSED BY REPLACING THE
BATTERY.
NOTE
Do not discard the old battery in the
environment. Mares adopts a policy of
respect for the environment, and urges
use of the appropriate separated waste
collection service.
WARNING
When changing the battery, the o-ring
must be replaced. The Smart Air battery
kit contains a high quality CR2450 battery
and a new o-ring. All computer o-rings are
inspected individually for integrity.
Follow these steps and refer to the pictures:
a) Remove the two screws as indicated in the
picture below. These hold the battery cover
in place.
NOTE
Do not remove the screws denoted with !
b) Use a small flat-head screwdriver to pry
open and lift the cover as indicated in the
picture below.