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102808_CAPAC_MANUAL_MODEL_90W12D_SYSTEM.doc
Section IV
Operation
To achieve optimum results with CAPAC
®
, the equipment must operate
continuously while the boat is in the water. Therefore, to prevent accidental de-
energizing of the system, no on-off switch is provided on the controller.
As soon as the hull is afloat, the reference electrode creates a meter
deflection on the CAPAC
®
Monitor (when the button is pushed) which is related
to the degree of protection to the metal hull fittings regardless of whether the
anode is emitting any current or not. Each type of metal (brass, monel, stainless,
etc.) creates a different meter reading when it is freely corroding in sea water.
Each type of metal has a correspondingly higher reading when it is protected or
polarized. The metal for which the CAPAC
®
system is factory set is imprinted on
the font of the 90W12D controller.
Operating Procedure is as follows:
After the system is installed according to Figure 3.6 and installation
instructions in Section III, simply apply 12 V DC to input of controller and the
system will function completely automatically. The hull potential should be
periodically checked by depressing the button on the face of the panel of the
CAPAC
®
Monitor. In fresh water, polarization of large bare metal areas is quite
slow and it may take up to two weeks for the hull potential to reach the value
indicated in Table 2.2 of the application section of this manual.
In salt water it may take several days to polarize large metal areas. When
the bare metal areas have been coated, polarization usually occurs in a few
minutes.
The anode current required for optimum protection changes with water
salinity, speed of the hull, and aging of the paint system. The meter reading as
read on the CAPAC
®
Monitor (when the button is pushed) created by the
reference electrode is continuously monitored by the transistor control circuit and
compared to the automatic control setting as set at the factory. The controller
rapidly increases or decreases the current, as conditions demand in order to
maintain the hull at the desired level of protection.
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