O
PERATION
M
ANUAL
P
ROMO
®
2000
P
ALAS
®
G
MB
H,
M
ARCH
2010,
V
ERSION
V001032010
35
7
Optional
Equipment:
Cuvette
Heating
for
welas®
digital
1000,
welas®
digital
2000,
welas®
digital
3000,
Promo®
2000,
Promo®
3000,
welas®
1000,
welas®
2000,
welas®
3000,
PCS
2010,
PCS
2000
7.1
Contents
1.
Function
2.
Set
up
and
cabeling
of
the
cuvette
heating
3.
Operating
the
controller
4.
Maintenance
and
Cleaning
5.
Technical
Data
7.1.1
Function
In
certain
applications
it
is
necessary
to
heat
up
the
cuvette
of
the
above
mentioned
instruments,
especially
when
the
aerosol
has
a
high
humidity.
Heating
is
necessary
because
the
temperature
of
the
cuvette
has
to
be
higher
than
the
dew
point
of
the
aerosol
to
avoid
condensation
of
the
hu
‐
midity
on
the
glasses
of
the
cuvette.
This
condensation
would
disturb
the
measurement
which
is
taken
through
these
windows.
As
second,
particles
from
a
hot
aerosol
are
transported
towards
cold
surfaces
by
diffusion
and
contaminate
theses
surfaces.
This
process
can
be
reduced
by
heating
the
surfaces
of
the
aerosol
transporting
ways
(tubes).
Due
to
this,
not
only
the
cuvette
should
be
heated,
but
also
the
whole
way
of
the
aerosol
from
the
place
where
the
aerosol
sample
is
taken.
The
cuvette
is
heated
by
inserted
heating
elements.
The
temperature
is
measured
with
a
sensor
and
the
heating
power
is
regulated
by
a
temperature
controller
to
a
preset
value.
7.1.2
Setup
and
cabling
of
the
cuvette
heating
The
cable
from
the
cuvette
is
connected
to
the
heating
supply
socket
on
the
back
side
of
the
we
‐
las
®
digital
1000
control
unit
(7
‐
pole
plug).
For
welas
®
digital
2000
and
welas
®
digital
3000
the
con
‐
nection
is
made
to
the
6
‐
pole
round
socket
on
the
front.