Model
2000
Serie
s
DewPrime
Dew
Point
Hygrometers
-----------Installatio
n
Procedures------------
2.4 TEMPERATURE
LIMITS
Install
the
inst:n.:onent
i
n
locations
where
the ambient
temperature
will not exceed the range 0 to +50°C (32
to
1
2
2°F
)
.
The Model
S1
Sensor
willoperate over the range of
-50
to
+
70°C
.
The
Model
S2
Sensor
tempeiature
range is
-
50
to+100°C.When the
anticipated
operating
range
of
the
Sensor
is
expected
t
o
be outside the operating
temperature
range
of
the instrument, the Sensor should
b
e
removed
fromthe
instrument
an
d
e<mneeted
to
the
instrument
by
means
of
the
Remote
Mounting
Kit.
Always
maintain
the
Sensor
temperature
at least 5°C
above the dewpoint tcmperarure of
the
gas
beiDg
measured.
2.5 WIRING
CONNECfiONS
The
instrumemrequires
apower
source
of 1151230
VAC,
50-400Hz
.
When
the
Model2000
Serie
s
is
received
and
before
attaching
it
to a
power
source,
examine
the
priDted
circuit card
behind
the window
on
the
A.C.
Power
Module
on the rear of the unit. The
card
.
shoul
d
show
"120"
CTr
"240,"
dependiDg
on
the
intended
usage
.
Als
o
,
confirm
that
the
corresponding
fuse
is
inserted
in
the
A.C.Power Module:2 amp 250V, 3
AG,
Slo-Blo
for
115
VAC
or 1
amp
250V
,
3
AG
,
Slo-Blo
for230VAC.
lwARNINGI
Removing the
ModellOOO
Series
Control
Unit cover
upose
s
the
user
to
liDe
operating
voltage
s
when
the
1lllit
is
plaged
into the
powe
r
source.
If
the
instrument
is
plugge
d
in
when
perform.iDgaDYcircuitadjustmena
or
tests, take
extreme
care
not
to
come
in
contact
with
the
high
voltage
present
on.the
transformer
,
the
A.
C.
line
filter,and thefront
panel
power
switch.
2.6
AMBIENT
TEMPERATURE
PROBE
(Model2002
only
)
The
Model2000
Series can be configured
to
measure ambient temperature (AT) and
calculate
relative
hmnidit
y
(
RH
).
This
configuration,
which
includes
several
other
unique
features,
is
refened
to
as
the
Model2002
.
The AT
probe
iDstallation
is
made
by
coDD.ectingthe
appropriate
leads to
the
termina
l
strip
on
the Model
2002
controller
back panel labeled
"AM
B
.
1EMP
.
PROBE".Attach
the
wires
(flying
leads) to the correct
temrinal
screw
in
the
following
manner:
Attach this lead •
•
• To this
terminal
.
•
.
Bear wire
Sbld
White
teflo
n
coate
d
wire
Wbt
Black
teflo
n coatedwire B1k
Red
teflon·coated
wire
·
Red
2.7 PLUMBING
CONNECfiONS
A basic
requirement
of
accurate dewpoint measure-
ments
is
the
prope
r
design
of
the
gas
sampling
system.
In
order
that
the
Model2000
Series
measures
the
actual
moisture
content
ofthe
gas,
it
is
essential
that
the
sampling
components
neither
comnoute
t
o
nor absorb
moisture
fromthe
ga
s
UDder
study.Also
,
the
sampling
componems
must
no
t
modif
y
the
pressure
or
temperature
parameters
of the
gas
such
that
they
woul
d
affect
the
moisture content
of
the
sample
.
When
de
w
point mea-
surement
s
are
made
,
it
is
essential
tbat
th
e
temperature
of sampling
components
not be allowed to
drop
below
the
dewpoim
temperature
of
the
sample
.
This
prevents
condensatio
n
fromoccurringwithin.the line,causing
an
erroneousmeasurement Sampling
lines and the Sensor
must be properly
preheated
whenmeasuring
dew
points
above
ambient
atmospheric
temperature.(Refer
to
Preheatin
g
Sensor
and
Sample
Lines,
subsection
2.9).
Generally
,
for
dew
point
temperature
s
above
-l8°C
(about
800
P
at
1.02
lqVcm
2
(14.7 psia)), no special
precautions
need
be
taken
in
the
selectio
n of sampling
line
materials,
other
tha
n
ensurin
g
that they
have
tempenl!Ure
and
pressure
ratings necessary to
handle
the
sample
and that all
coDD.eCtions
are gas tight.
The
problem
s
associated
with
the
hygroscop
ic
nature of
samplin
g
hardware
worsen
as
the
absolute
moisture
content
decreases
;
that
is,
as the
dew
point
lower
s
.
For
dew
point
temperatures
belo
w
-l8°C,
some
attention
2-2
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