11
F.
DRY
GAS
TO
MINIMIZE
CONDENSATION
Dry
gas
flows
into
the
Turret
6
via
the
stainless
1/8
‐
inch
hose
barb
on
the
rear
side.
The
gas
passes
through
small
channels
in
the
base
of
the
Turret
body,
to
partially
equilibrate
in
temperature,
before
passing
up
through
small
holes
on
both
the
inside
and
outside
cuvette
surfaces.
A
flow
of
dry
gas
to
prevent
condensation
is
necessary
any
time
the
Turret
6
is
controlled
below
the
dew
point
temperature
present
on
the
inside
of
the
sample
compartment
of
the
spectrometer.
For
ambient
air,
this
would
typically
be
about
5
°C.
G.
EXTERNAL
TEMPERATURE
PROBE
A
¼
‐
inch
phone
jack
labeled
“Probe”
can
be
found
on
the
back
panel
of
TC
1
Temperature
Controller.
This
jack
will
accept
the
plug
on
a
standard
Series
400
or
Series
500
thermistor
probe.
When
a
probe
is
plugged
into
the
jack,
the
probe
temperature
is
presented
on
the
display
of
the
TC
1.
Place
the
probe
in
a
sample
to
measure
the
actual
temperature
of
the
sample,
which
will
lag
in
time
from
the
temperature
of
the
cuvette
tower.
We
do
not
sell
the
probe,
but
there
are
many
Series
400
and
500
probes
on
the
market.
Quantum
Northwest’s
preferred
probe
is
the
YSI
423
available
from
Cole
Parmer.
The
YSI
423
is
reasonably
resistant
to
immersion
and
responds
rapidly
to
temperature
changes.
Also,
the
fine,
coiled
wires
of
the
YSI
423
conduct
very
little
ambient
heat
to
the
thermistor
at
the
end.
Excellent
Series
500
probes
can
be
obtained
with
diameters
less
than
a
mm,
providing
access
to
small
volumes.
A
disadvantage
of
these
probes
is
that
they
are
not
pre
‐
calibrated.
H.
EXTERNAL
COMPUTER
CONTROL
All
functions
may
be
accessed
either
through
a
Serial
(RS
232)
or
a
USB
located
on
the
back
of
TC
1
Temperature
Controller.
You
may
write
your
own
program
or
purchase
our
application
program
T
‐
App.
T
‐
App
will
plot
temperatures
of
the
probe,
cuvette
tower
or
even
the
Peltier
element
heat
exchanger
vs
time.
It
will
also
permit
you
to
set
up
temperature
ramps.
If
you
wish
to
do
your
own
programming,
please
see
the
Appendix
for
communication
instructions
and
the
set
of
text
commands
that
may
be
used
and
responses
to
the
commands.
4.
ERROR
CODES
When
errors
occur,
the
line
1
of
the
display
presents
an
error
code.
Line
3
of
the
display
identifies
the
error
and
line
4
of
the
display
presents
possible
solutions.
The
most
common
events
that
cause
errors
to
be
displayed
are
loose
cables
or
inadequate
coolant
flow.
For
errors
not
easily
solved,
please
contact
us
through
our
website,
www.qnw.com.
E5–
cell
out
of
range
warnings:
loose
cable,
sensor
failure
The
temperature
controller
is
not
receiving
a
reasonable
response
from
the
sensor
on
the
cuvette
tower.
Either
the
sensor
has
failed
or
a
cable
is
not
making
a
good
connection.
