O
PERATION
M
ANUAL
P
ROMO
®
2000
P
ALAS
®
G
MB
H,
M
ARCH
2010,
V
ERSION
V001032010
36
7.1.3
Maintenance
and
Cleaning
To
check
if
the
glasses
of
the
cuvette
are
clean,
simply
remove
the
light
trap
of
the
sensor
unit.
The
LED
for
pm
‐
voltage
(marked
as
'measuring'
or
'PM
active'
)
has
to
be
switched
off
(by
use
of
software)
and
the
lamp
has
to
be
switched
on.
To
see
if
the
glasses
need
cleaning,
look
at
the
front
glass,
if
it
is
dirty
or
not.
Do
not
stare
into
the
light
beam!
This
may
be
dangerous
for
your
eyes!!
To
take
the
cuvette
out
of
sensor
unit,
remove
the
connections
of
the
tube
and
unscrew
the
two
screws
that
hold
the
cuvette.
Then
the
cuvette
can
be
taken
out
by
pulling
it
on
the
upper
tube
and
pushing
it
in
the
same
time
on
the
lower
part
of
the
tube.
When
the
cuvette
is
taken
out
of
the
sensor
unit,
you
can
check
the
glass
windows
by
looking
through.
Please
note:
all
small
contaminations
have
to
be
removed.
Sometimes
glasses
look
clean
but
they
may
be
covered
by
liquid
(after
measuring
e.g.
DEHS
or
oil
from
nebulisers).
If
necessary,
take
out
the
glasses
of
the
cuvette
by
unscrewing
the
rings
which
hold
the
glasses
with
the
special
unscrewing
tool
supplied
with
the
cuvette.