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therefore be +4mV ±5mV (@ 20°C). Since the polarity of the reference electrode
potential will be reversed.
9.0 Test using Zinc Test Blocks
A quick check of the operation of the BCM can be carried out using a Zinc test block.
Potential measurements taken should be logged to check if any significant variation
occurs. Differences in the order of 10mV or so between readings are quite possible and
will mainly be caused by variations in water salinity at different locations or due to
changes in water temperature. As a guide, readings taken in a 3% salt solution at
ambient temperature of 25°C are as follows:-
Zinc (Zn) = 1.00 - 1.05V
Soak the BCM for 2 hours in a Seawater solution. The salt concentration has a great
effect on the readings, so does the state of the test block. A tarnished block will give a
lower reading than clean one. Do not leave the test block in the Seawater, remove after
use.
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