2A in-line fuse
Switch front view
LCD temperature display
a i at
Building and installing a simple
multi-channel temperature display
By Rick Hudson
emperature is an important
to monitor on a boat.
Whether the inside of
your fridge, the exhaust
hose of your engine(s), the house batteries, the stuffing box, the
oil, or a freezer full of salmon, knowing
the temperature of a particular system
provides an important degree of comfort. If one of those systems begins to
heat up or cool down, usually a valu-
able warning for you to take corrective
measures before damage occurs.
Like many boaters, I used the tried
and tested technique,
which is certainly handy, but Lord Kelvin would not have approved. Later I acquired an infra-red handheld unit that
I pointed at an object to read its temperature. But the reality was I do
it much when under way; there were always distractions, and besides, crawling
around a noisy, hot engine and shooting
temperatures my idea of fun.
The obvious solution was to bring the
temperature readouts to a central point
(close to the helm), but after searching
the internet it appeared that a commercial product capable of monitoring six
to 12 different hot spots was going to be
expensive. Most also provided data logging, which was nice but unnecessary.
What I needed was just the current temperature status at a number of locations
on the boat.