Cochran Nemesis IIa NITROX, User Manual

Page: 43 / 79

43
QUESTIONS AND ANSWERS
Should I turn my WU off when it is not in use?
Yes. While your WU is powered by two alkaline ‘N’ batteries that will provide a long
battery life, you still should turn the WU off when you are going to be away from the TU
for an extended time.
Shouldn’t I take the batteries out of the TU when my dive computer is not going to be
used for several months?
No. Inside your TU is a small lithium battery that provides power for long-term data
storage. Removing the batteries, or leaving fully discharged batteries in the TU, will
cause this coin cell to gradually lose its power. Also, the timestamp clock does not
operate when the batteries are removed.
Is this coin cell replaceable?
The coin cell can only be replaced by Cochran Undersea Technology since it requires
the opening of the TU. By keeping charged batteries in the TU, the battery life of this
coin cell is expected to be over ten years.
When I change the batteries in my TU, will my dive computer retain data for the current
dive?
Yes, providing you follow the instructions on battery replacement.
When I tapped the TU on, it did not issue the five confirmation beeps, WHY?
The TU may already be on. Turn your WU on to see if the TU is transmitting data. If it
is not, check the batteries to see if their voltage is low. In a noisy environment, such as
on the boat when it is underway, it may be difficult to hear the confirmation beeps.
At what battery voltage will my TU cease to operate?
Fully charged, the four AA alkaline batteries provide six volts. When they discharge to
below 4.5 volts, your TU will not turn on.
Can I turn the TU on underwater?
No. The TU will not turn on if you are underwater. Should you enter the water and begin
a descent without turning the TU on, slowly surface, turn the TU on, wait for it to com-
plete its Self-Diagnostic Mode, and then begin your descent once again.
Is the transmitting range affected by the positioning of the TU and WU?
Yes, however, in normal diving situations there is sufficient operating range regard-
less of orientation.
What is the proper way to tighten the TU and WU battery caps?
The caps should be tightened using the enclosed battery removal tool. The o-rings
should not be visible when the caps are properly tightened, but be careful not to over-
tighten the caps. Once the o-rings are seated, simply hand-snug each cap.