Sentry Manual Rev2.1
Copyright 2017, Nellis Engineering, Inc.
3
Installation
The internal transmitter is held in place inside the DPV with adhesive hook and loop faster tabs
stuck on the inside wall. There is an attachment placement on the top inside wall of the tube, for
the transmitter antenna and an attachment placement on the bottom inside wall for the water
detector and reed power switch. Clean the inner diameter with alcohol or acetone if necessary, so
the adhesive will stick. The long Velcro strip containing the antenna of the transmitter should be
positioned as shown, approximately 2-3 inches from the rear edge of the tube. Peel off the backing
of the three short pieces of hook material, to expose the adhesive, and affix it to the upper inside
wall of the tube in an arc as shown in (Fig. 1) Two outer pieces of hook strip attached to the inside
wall to support the each end of the antenna will require removal if the batteries ever need to be
removed from the body.
For the water detector, measure 1.3” into the tube at the bottom from the opening edge and
place a temporary mark with a pencil or piece of tape. Ensure the two short hook tabs are
attached to the water detector loop strip, peel off the backing of both hook sections to expose the
adhesive and affix it to the bottom inside wall with the wire exiting to the left, so the hook tabs
will not interfere with battery removal, (Fig. 2) The rear edge of the hook tab should be at the 1.3”
mark and the water detector further inside. This will place the reed switch used to turn on the
transmitter, 2.3” from the tube opening. The wires should exit to the left as shown.
Fig. 1
Fig. 2
Place a mark on the outside of the tube 2.3” from the end of the tube and directly outside the wall
from the water detection board. (FIG. 3) Wrap the mounting strap for the Sentry external display
around the tube. Pass the end of the strap through the bungee loop and pull it back, stretching
the bungee and affixing the hook and loop faster together. Position the strap so that the gray
block that slides on the bungee, stops against the strap and over the mark, which is directly
outside the tube from the water detection board. The gray block contains a magnet to activate
1.3”
