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Gap Between the Sensor and Magnet:
Grey AutoAnchor Sensor (#9067):
6mm x 4mm Magnet (#9009): Minimum 3mm and Maximum 30mm
10mm x 8mm Magnet (#9061): Minimum 3mm and Maximum 50mm
Black 2 wire AutoAnchor Sensor (#9008): Minimum 3mm and Maximum 8mm
Reed Switch 2 wire Sensor: Minimum 3mm and Maximum 5mm
(Must use a 10mm x 8 mm magnet)
Magnet Polarity:
Not relevant when using the grey AA sensor (#9067) or a reed switch
sensor. If retrofitting, using the original black AA sensor (#9008) the south pole (white side)
of the magnet must face the sensor.
Vertical Windlasses Using Rope and Chain Rode
T
he rode must run between the sensor and magnet for an accurate rope and chain count.
If your windlass is prefitted with a magnet in the bottom of the chainwheel you need to
remove it and fit a new magnet in the top of the chainwheel. Refer to Fig 2.
Magnet Size:
10mm x 8mm magnet (#9061).
An 8mm x 6mm magnet (#9052) may be used on
smaller windlasses. Check with your supplier.
Magnet Fit:
If the windlass is not pre-drilled, drill a
hole 10.3mm (13/32”) diameter and 9.5mm (3/8”)
deep into a spoke in the top of the chainwheel.
The magnet and sensor must be aligned so that
the anchor rode passes between them. (See Figs
2 & 3). The centre of the magnet and the centre of
the sensor may be up to 10mm (3/8”) out of direct
alignment. (See Fig 6). Templates and drilling
instructions are supplied for some windlasses.
Magnet Seal:
Insert the magnet into the hole and
cover with a minimum of 1mm of epoxy to seal it
from salt water. Failure to do this will impair the
magnet’s durability.
Sensor
Magnet
Fig 2
Fig 4
Seal with minimum 1mm epoxy.
Magnet
Magnet
Chainwheel
Spoke
Fig 3
Sensor
Gap Between the Sensor and Magnet:
Grey 3 wire AutoAnchor Sensor (#9067):
10mm x 8mm Magnet (#9061): Minimum 35mm and maximum 50mm
8mm x 6mm Magnet (9052): Minimum 30mm and maximum 44mm
Magnet Polarity:
Not relevant.
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