Introduction
The
Sentry is
a single zone corrosion monitor.
LED’s
provide indication of the vessel or structure's level of cathodic
protection. For example, you may wish to monitor the hull
of a marine vessel. Install the Sentry
and
a reference electrode. Press the test button and the LED's will
light. A green indication shows the vessel is correctly protected,
a red indication warns of corrosion susceptibility.
Other
zones may include the insides of sea chests, ballast tanks, water
jet tunnels etc. The
Sentry
provides
a convenient way of monitoring the cathodic protection of a
structure without having to inspect the sacrificial anodes.
The
Sentry
kit
comprises a Sentry
monitor,
mounting screws, 3 AA batteries, and an earth lead.
Click picture for larger image
|
Sentry
kit
|
Note:
A reference electrode has to be ordered separately.
Refer
to: Reference electrode installation
and Order information
Installation
- The
Sentry can be bulkhead
mounted in any convenient location such as in the engine room
or in the vessel’s bridge/pilot house.
The box dimensions are 115 mm x 65 mm x 40 mm deep.
- Drill
two 3.8mm diameter holes at 83.5 mm by 52.5 mm centers on the
hull bulkhead or other suitable mounting location. See the schematic
drawing of the Sentry below.
Click picture for larger image
|
Schematic
of Sentry
with
wiring and installation details |
- Remove
the Sentry lid taking
care to keep it supported. Mount the Sentry
box using the two 8g x 12 mm self tapping screws provided.
- Insert
the 3 AA batteries supplied. Refasten the Sentry
lid.
- Connect
terminal E to the hull with the earth lead provided.
- Connect
terminal 1 to the reference electrode.
Monitor
operation
Press
the test button. The LEDs will light.
To
conserve battery life the Sentry
operates normally
in ‘power down’ mode. The Sentry
will auto power
down after one minute.
The
reference electrode must be connected to the corresponding terminal
on the Sentry
and
it must be in contact with sea water. Only then will the Sentry
indicate
the cathodic protection level correctly.
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