Model2000
Serie
s
DewPrime
Dew
Point
Hygrometers
-------------Introduction-------------
1.5
OPTIONS/ACCESSORIES
1.5.1 Remote
Mounting
When it is desired
t
o
mo\Dlt
the
Sensor
in a
location
different
from
the location of the
Model2000 Series
Control Unit, use the Remote Mounting kit.
The
Remote
Mounting kit allows for distances
between
Sensor and Control Unit to be as much as 250 feet
(75
meters). Instructions for installing the Remote
Mount-
ing kit are included with the
kit.
If
a
Remote MountiDg
kit is ordered with the Model 2000 Series
Control
Unit, the Control Unit and Remote MountiDg kit and
Sensor are checked out and calibrated at the
factory
as
a system. However,
i
f
a
Remote Mounting kit
is
ordered separately for field instaJJation, then
field
calibration of the PRT
Resistance-to-Voltage
con-
verter will be
necessary
to
compensate
for the
slight
resistance changes
introduced
by the change in
cable
length.
1.5.2
Panel
and
Rack
Mounting
The Panel and Rack Mounting option allows
the
Model 2000 Series to be
converted
from a bench-
mounted model to one
tbat
can be mounted in either
a
panel or rack. When mounting in a
panel,a template
included with
the
kit provides for ease in locating
the
cutout and mounting
hole
s
.
Once
installed in
a
panel,
the hole cutouts are covered by the front panel of
the
kit.
1-5.3
Sample
System
Module
The Sample System consists of a Neptune Dynapump
Model No.2, a Brooks 0-5 SCFH flowmeter,
eight
feet
of tubing, and
allhardware
and fittings
necessary
for attaching to a Model
S
1
or S2 Sensor.
1.5.4
Mirror
Microscope
(S2
Sensor)
A Mirror Microscope option is offered for
applica-
tions requiring a view of the
actual
dew layer
esta
lished on the Sensor mirror
surface
.
Thi
s
is
particu-
larly useful when
attempting
to obtain an
NIST
certified calibration when it must be determined
i
f
the
system is controlling on the
actual
frost point
at
temperatures below 0°C, or on supercooled
dew.
Since the
relationship between
dew
point and
frost
point for temperatures
below
0°C is
11
known,
it
is
easy to
convert
from one to the
othe
r
<mce
i
t
is
verified
that control has been
established
on
dew
or
frost
below
0°C.
This
can be
determined
by visually
observing
the mirror
surface
using
this Minor
Micro-
scope
option.
To
incorporate
this option, it is only necessary
to
remove the S2
Sensor
housing provided with
the
standar
d
instrument
and replace
it
withthe
one
provided
in the Mirror :Microscope kit. Use the
same
screws
that
were
removed
from the original
Sensor
housing to
retain
the new
microscope
Sensor
housing,
since these
screws
are especially strong and
will
ensure that the pressure integrity of the
Sensor
is
maintained.
IwARNING!
The
microscope
provided
for this
op-
tion has been pressure-tested to
1800
psi, six
times
the
allowable
workiDg
pressure
of the Seasor, to
eDSDI'e
its
integrity.
However
,
with the
micro-
scope
installed,
it
is
recommended
that
maximum
SeDSOr
internal
pres-
sure not exceed 25 psi, since a gas
under
pressure
could cause the JDi.
c:roscope to become dislodged
aad
bec:ome
a
projectile
that
mightiDjlll"e
someone
observinl
the dew layer
at
the
time
of
dislodgement.
1.5.5 Explosion-Proof Housing
(S2
Sensor
only
)
The
Explosion-Proof
Housing is comprised of
compo-
nents designed for Class
1
,
Division 1, Groups C
&
D
hazardous enviomments
vmere
high
accuracy
,
long-
term
reliability,
and NIST traceable dew points
are
required.
Power
is
supplied
to the chilled
mirror
Sensor
through a
remote
cable from the
controller,
enabling the
Sensor
to be mounted at a distance of
up
to 250 feet. The
housing
assembly is not agency-In
in-
1-4
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