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10
SL-PEL Series
Sectored Port Entry Light
CONSIDERING TOWER RIGIDITY:
It is important to remember that the PEL sectored light has a precision of typically one min of arc and
any structure or mounting bracket used to support it must have that rigidity in terms of horizontal twist.
When considering the PEL’s mounting, the following items need to be reviewed if these structures will
be utilised: size of daymark, its age, ladder and platform access. In addition, while the light-weight
nature of the PEL will permit mounting on a tilted column, its slender nature and the need to align the
light when fully erect precludes its use.
The structure must therefore be able to support the following: the PEL itself, its required power supply,
any daymarks, and at least two maintenance staff without twisting in heavy gale force winds (up to 100
MPH).
CONSIDERING HEIGHT:
The height of the structure above chart datum must suit not only the tallest bridge height but also
the smallest bridge height during all states of the tide, and not only at the extremity of the channel,
but from the nearest point of exit or to that point where other port lights take over. This is a function
of the vertical divergence of the PEL and the centre line of the PEL can be arranged to point into
mid-channel, ensuring that the top of the beam to 50% equates to the tallest bridge height on the
largest tide. The reverse is true for the smallest vessel on the lowest tide and the point of exit. Sealite
engineers can offer advice in this regard upon request.
CONSIDERING TOWER COLOUR:
In most cases the PEL sector light will supplement an existing mark which may be a well-recognised
building, solid stone tower, or steel lattice construction. It could be that the nature and type of use
of this structure and surrounding background has changed over the years. While the PEL itself will
enhance and improve the structures identification in day time, it is important to review.
Perhaps the original building or structure was white when viewed against a jungle or sloping green
fields and with modern build up around the port it is now surrounded by concrete buildings or tanks.
During project review and implementation a simple inbound trip on the pilot or suitable vessel whilst
taking pictures at one mile intervals will reveal many simple opportunities for further enhancement.
Changing the tower colour or adding colour to the structure will assist the mariner in improving its
recognition. It is not essential to retain its original colour just because it has always been so.
INSTALLATION GUIDE
Thank you for choosing a Sealite SL LED series precision sector light. The unit has been pre-
programmed to suit your order which includes the colour of each sector. All other parameters are user
programmable. These parameters have been factory set.
Prior to installation
