Installation manual
CARBON
MONOXIDE
"CO"/.LOW·CO
GENERATORS
IMPORTANT
INFORMATION
Catalyst performance
will
degrade over
time.
As
the
generator accumulates operating
hours,
CO
concentrations
will
increase.
The catalyst must be replaced every
2,000
hours of engine operation.
Verification of satisfactory CO levels must be done
seasonally
or
each 1,000 hours (which ever occurs first).
Verification
involves
actual
sampling of exhaust
gas
with
an
appropriate
CO
analyzer.
There
are
two
locations
where
exhaust
gas
can
be
sampled.
Dry,
but
hot,
exhaust
can
be
sampled at
the
plugged
tapped
hole
in
the
exhaust
elbow
intended
for
back
pressure
meaSurements.
Measurements
at
this
location
may
not
be
practical
in
all
instances
due
to
the
high
exhaust
temperature,
temperatUre
limits
of
the
analyzer,
safety
concerns
over
temperatures involved or
the
possibility of
high
levels
of
CO.
The other location
is
the
boat's exhaust outlet,
which
·contains entrained cooling water (except
dry
stack exhaust
systems).
Only
analyzers
with
probes
should
be
used
at
this
location
and
it
is
critical that
the
probe
not
ingest
water.
Probe-type
analyzers
have
an
air
pump
drawing
a
gas
sample
through
the
probe.
As
a result,
they tend
to
ingest water
when
it
is
present.
Be
sure
to
aim
the
probe
downwards
with
the
opening
pointed
in
the
direction of
the
water
flow
and
just
out of
the
flow.
Position
the
analyzer
as
high
as
possible
with
the
tubing leading
to
the
probe running continuously
down-
hill.
Observe
the
usually translucent tubing
between
the
probe
and
the
analyzer
and
be
sure
no,
water isbeing
ingested.
If
any
water
is
ingested
into
the
analyzer,
it
must
be
repaired or replaced
and
recalibrated.
When
measuring
CO
at
the
exhaust outlet
be
aware
of
the
ambient CO
level
by
also
measuring
CO
away
from
and
upwind
of
the
exhaust outlet, especially
in
marinas.
the
CO
level at
the
exhaust
will
be
influenced
upwards
by
the
ambient
level.
ADJUSTABLE
CLAMP
Whenever
taking
the
time
to
verify
proper
CO
concentration
from
the
exhaust
with
a
CO
analyzer,
always
take
the
opportunity
to
use
the
analyzer
to
"sniff'
around
the
engine
looking
for
CO
from
exhaust
leaks.
Pay
close
attention
to
the
connection of
the
cylinder
head
to
the
exhaust
manifold,
the
exhaust manifold to.the water injected exhaust
elbow,
and
all
subsequent downstream exhaust components
and
hoses.
·
Remember,
exhaust
gas
that
has
not
yet
passed
through
the
catalyst
is
raw,
untreated exhaust
and
is
very
high
in
CO
content.
Analyzers
usually require periodic calibration.
Follow
the
instructions that
come
with
the
analyzer
very
carefully
regarding calibration.
The
following
are
manufacturers that offer
CO
analyzers:
Extech,
TIF,
Testo, 'rSI, Bacharach,
Fluke,
Monoxor,
Pyrite,
Zellwgwer
Analytics,
Industrial Scientific
Corp,
GFG,
TPI,
Teledyne
and
others.
Westerbeke
recommends
analyzers
with
.
a
probe
connected
to
the
analyzer
by
a length of
transparent
tubing.
They
are slightly
more
expensive
than
those
with
the
sensor built
into
one
end
of
the
analyzer,
but
they
allow
you
to
sample
the
exhaust
coming
out of
the
boat's
exhaust
outlet.
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