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Fishing vessel fitted with a Sentry corrosion monitor.

The Sentry provides an entry level corrosion monitor for measuring the cathodic protection level on a single zone such as a ship's hull. 

Pressing the 'test' button lights up a pair of LED's. Green shows the vessel is cathodically protected. Red LED indication points to probable remedial action being required, such as replacing the hull anodes.

Click here to read more about Sentry......

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The whalewatch vessel, Te Ao Marama, New Zealand. 
One Sentry multizone and 3 reference electrodes (hull, port and starboard sea chests) monitor  cathodic protection levels

The Sentrymultizone has the same features as the Sentrylog but without the capability to log data.

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Graph showing corrosion events on a New York ferry
Click to enlarge

The Sentrylog is a multi-zone corrosion monitor with data logging capability.  Used as a monitor, an LCD display and LED’s provide indication of the vessel or structure's level of cathodic protection. Used as a data logger, the corrosion history can be recorded and examined.  

Each zone requires a reference electrode to be installed. Up to 3 zones can be monitored with one Sentrylog

Click here to read more about Sentrylog......

For more information on zones and corrosion in general, see corrosion basics.


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