Dive Rite Nitek Duo User's Guide download pdf (Page 24)

Using the NiTek Duo

20 NiTek Duo Dive Computer User Manual

To set for metric or Imperial operation:

1. Press Mode until “dive” is displayed and flashing on the

screen.

2. Press and hold Select and Set simultaneously for 5 to 6

seconds.

The computer beeps and changes to either feet (ft) or

meters (m).

3. When finished, press and hold Mode for 1 to 2 seconds to

return to time mode.

Understanding FO2 default

In your entry-level Enriched Air Nitrox training, you learned that

among the greatest risks Nitrox (EANx) use poses is CNS

oxygen toxicity. CNS oxygen toxicity can occur if Nitrox is

breathed at depths where the partial pressure of oxygen (PO2)

exceeds safe limits.

The NiTek Duo is designed to help divers avoid such situations

by presenting information and warnings regarding current PO2

levels and cumulative exposure to elevated PO2s. To do so, the

NiTek Duo must be set to an FO2 that accurately matches the

concentration of oxygen in the gas mixture being breathed.

Similarly, the NiTek Duo is designed to help divers avoid

decompression illness by providing no-decompression limits

(NDLs) or mandatory decompression stop information. Again, to

do so, the NiTek Duo must be set in a manner that accurately

matches the concentration of nitrogen being breathed.

When this information is not available, the NiTek Duo attempts

to protect divers by basing its oxygen- and nitrogen-exposure

calculations on a “worst case” assumption. This is, that

calculations are based on a mixture containing up to 79 percent

nitrogen and 99 percent oxygen. This “worst case” calculation is

what is referred to as the FO2 default setting.

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Dive Rite Nitek Duo User's Guide Page 24