Sentry Manual Rev2.1
Copyright 2017, Nellis Engineering, Inc.
6
Fig. 8
Operation
To wake the display, tap the left or right side of the display housing three times slowly. Tapping
too fast will not be recognized, to discriminate from vibration. In the bottom right corner of the
display (Fig. 9), it will display “
UNITS
” for 10 seconds. To change the depth reading between Feet
and Meters, you must tap the side of the display 5 times within this 10 second window. Each
registered tap will be show on the display by a small dot near the center of the screen. The setting
will be saved for all further dives, unless changed again at start up.
At the bottom of the display, next to the display’s battery gauge, a series of vertical bars will
appear, indicating the signal strength from the internal transmitter. More bars equal better signal
strength, which can be used for positioning the display. In air and fresh water, the display should
have 10 bar most of the time, but in salt water, the RF signal is attenuated and fewer bars may be
displayed. If the bars are blinking, that indicates that the display is not linked up to the internal
transmitter. 3-4 bars are normally the minimum for establishing a link to the internal transmitter.
It may take 10-20 seconds once you have 4 or more bars, for the display to establish a link.
Moving the display slightly towards the rear of the DPV should increase signal strength. Ensure
the gray block sliding on the bungee is positioned so that it is directly outside of the water
detector on the inside of the DPV tube. Sliding the gray block up will disable the transmitter when
not in use and this must be done when removing the nose plug from the Genesis to disable the
motor controller during storage.
CAUTION
Leaving the transmitter powered while in storage will slowly discharge the #1 DPV battery,
leading to permanent damage of the #1 DPV battery, if allowed to over discharge.
