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Summary of Contents for Logic SENTURY
- Page 1 SENtry SENtry SENtry SENtry DPV Dashboard Installation and Operator's Manual Sentry Manual Rev2.1 Copyright 2017, Nellis Engineering, Inc.
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Page 2: Table Of Contents
Table of contents Page Installation Operation Batteries and Charging Dive Planning Battery Life Calculation Warranty Warnings & Cautions WARNING A warning means that injury or death is possible if the instructions are not obeyed. CAUTION A caution means that damage to equipment is possible. -
Page 3: Installation
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. - Page 4 the reed switch of the internal transmitter and is how you turn off the transmitter when not in use. This will position the display about 2.0” from the end of the tube as well. If reception is intermittent, position the display as far towards the rear as possible. Fig.
- Page 5 Fig. 5 The loop fastener strip on the transmitter (Fig. 5) covers the antenna. DO NOT CUT IT! Label the connectors on the batteries with self adhesive labels as shown in Fig. 6 & 7. Your battery with serial number ending in -1 will have a small connector coming out of the larger connectors for the transmitter power.
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Page 6: Operation
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. - Page 7 To turn the display off, tap the side of the housing 3 time. In the lower left corner “OFF?” will appear to confirm that you want to turn it off. (Fig. 10) Tap the side 3 more times within 5 seconds to turn off the display.
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Page 8: Batteries And Charging
As an example, if you DPV has a 600Wh battery when new, and it is now 3 years old, you should be near your exit at by around 450-500Wh consumed for this test and finish off the battery within a short swimming distance of your exit. -
Page 9: Dive Planning
Fig 11 Dive Planning Dive planning using the Sentry requires a bit of math, just like breathing gas planning, but nothing serious. As an example, if your dive plan calls for 90 minutes (1.5hrs) of run time, and you have 600Wh of battery, you should first reserve one third for contingencies, similar to the rule of thirds for breathing gas. -
Page 10: Warranty
450Wh/600Wh = 75% Using the chart of battery voltage vs. capacity for your battery, find your ending voltage (for this example well say the Sentry is reporting 29.2 volts) At 29.0V you should have a bit over 10% capacity remaining, plus the 75% you consumed during your dive, gives you an estimate that your battery now has a bit over 85% of the original battery capacity.
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