--
..;
ovetheModel2000
e D PrimeDew
·
Pomt
Hygrometer from Its shippmg carton
and
renw;e
y
shipping
ties, clamps, and packing material.
Save the Certificate ofT:raceability shipped with
tbis
manual.
Locate
andsave the small box containing
the
Cleaner Kit included in the
shipping
carton.
The
Model
S
1
or
S2
Senso
r
normally is attached to the
Model2000
Series Control Unit, except
whenthe
optional
Remote
Mounting Kit is ordered.
2.2
MOUNTING
2.2.1
General
The standard
Model2000
Series is
designe
d
primarily
for
desk-top operation. However, an optional
Panel/Rack
Mounting Kit
is
available for mounting the instrument
in
either
a
panel or rack that is at least 19 inches
wide
.
The
Sensor may be mounted remotely from the Control
Unit
by means of the optional Remote Cable
Mountin
g
Kit
2.2.2 Desk-Top
Operation
For bench-mounting the
Model2000
Series
Control
Unit, place the instrument on a clean, flat surface.
Ensure
there
are
no obstructions to the
fre
e
convection
of
air on the sides of the
instrument.
2.2.3 Panel/Rack
Mounting
For
panel
orrack mounting, the optional Paneli.Ra.ck
Mounting Kit must be used. This kit includes
a
19-inch
rack panel
that
canbe attached directly to a
standard
EIA
19-inchcabinet. The
Model200
0
Series attaches
to
the front panel andsits on the support plate, and
the
Sensor
is
the
n
attached
to a
support
bracket
behind
the
rack panel.A template is provided to be
used
to
position
the hole cutouts to which the Panel
Mounting
Kit
will
be
fastened.
Ensure
there are no obstructions around the
instrument,
whether
mounted in a panel or rack configu-
ration, that would impede the free convection of
air
arotmd the instrument. Installation instructions for
the
Panel/Rack
Mowtin
g
Kit are included with
the
kit.
2.2.4 Remote Sensor
Mounting
When it is
desire
d to mount the
Senso
r remotely from
the
Control Unit, the optional Remote Mounting Kit must
be
used
.
This
kit
consists of the
mountin
g
hardware
,
connec-
tors, and cable
necessary
for locating the Sensor up to
75
meteiS (250 feet) from the Control Unit. The actual
length of cable
required
should be
specified
in
the
Purchase Order since the instrument must be
calibrated
for the
specific
length of cable
used.
Installation
instruc-
tions
for
the
Remote MountiDg Kit are included
in
subsection
1.5.1
ofthismanual
.
2.3 COOLANT
CONNECI'IONS
For most
applications,the
Model Sl or S2 Sensor can
be
operated without the need for auxiliary cooling of
the
Sensor base.The
Senso
r
measures
the dew point of gases
where
the
dew
point is as much as 40°C (S1) or 600C
(S2)
belowambienttempenUure whenthe
Sensoris
attached to the
conttol
unit. Since the
depression
is
relative
to the base
temperature
of the Sensor, cooling
the
base
will
lower
the
minimum
dewpoint attainable
.
This
canbe
accomplished
by
providin
g
coolant to the
integral
brass coolant jacket
(optional
on
Sl)
that forms the
base
of
the
Sensor
.
1bis
coolant can be ordinary tap
water,
chilled water, or even a chilled
antifreeze
solution such
as
ethyleneglycol
or
methanol.
For
instance
,
a
coolant
temperature of 50Gf will permit dew point measurements
at -55°C for the S2 and -35°C for the
Sl
.
Coolant
flow
rates of 0.5 GPM
(2LPM
)
are adequate, and the
coolant
pressure maximumrating is 100 psia (70 kglcm
2
.
Connections for the
coolant
are
made
to the brass
coolant
jacket of the Sensor by
means
of 1/8-27 NPT
fittings.
NOTE
Whe
n
the
coolant tewpexatureisbelowthe
dewpoimt:emperature of theatmosphere
smroundingtheinstrumeotan
d
Sensor
,
the
Sensorshouldbe1m
&steued
ftom
the
rear
of the
instrumeot
and allowedto
attain
the
temperature
of thecoolantby itsel£ This
preventscoodensationftomfonningon
the
rear
portion of the
instrument
as
would
normall
y
happen
i
f
it
were
colde
r
than
the
dew
point
of
th
e
surrounding
atmosphere.
Use of the optional RemoteMounting Kit
allows the Sensorto
operate
at tempc:ra-
tures lower and higher than
the
instrument.
2-1
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