MtJdel2000
Series
DewPrime
Dew
Point
Hygrometers
----------
Maintenance and
Calibration----------
high
temperatures
and water deposits, and low for
low
temperature
s
and ice
deposits.
The GAIN
adjustment
compensates
for this change
in
gain
of the
condensate
phenomenon.
The GAm control is set at the
fi!.ctory
to provide
stable
operation
over the range of operation of the
instrument.
Before making
adjustments
to the GAIN
conttol
,
always
record the
bctory-set
position to aid in
returning
to
the
original
position at
a
later
date
.However,
i
f
dynamic
performance
must be optimized for
a particular
operating
dew point, the GAIN
control
may be
adjmted clockwise
as far as possible until unstable
operation
is
experienced,
as
noted
by
oscillations
in the dew point
temperature
and
in the
operatio
n
of the
CONIROL
indicator.
When
oscillation
occurs
during this
adjustment,
slowly turn
the
control
coUDterclockwise
umi1stable
operation
is
achieved
at a higher gain
setting.
Before
returning
to normal operation,
depres
s
the
MABC
key on the front panel of the
Model2000
Series
after
making changes to the
GAm
control to cause
the
instrument
to perfonn an ABC
cycle.
5.6.5
Compensation
COMPENSATION control potemiometer
R88 is
pro-
vided to introduce phase lead into the
a:zni,lifier
circuit
to
compensate
for the
thermal
phase lag
cha:ra.ctc:ristics
of
the thermoelectric cooler
in the dew point
Sensor.
Introduction
of this phase lead into the
optical
system
and
mirror
temperature
control
loop
pemrits
the loop
to
be
operated
at
a
higher gain
setting
without oscillation,
wise and advance the GAIN
control
until a
steady
oscillation is
obtained
If
oscillation
occurs, rotate
the
COMPENSATION control
clockwise
slowly,
noting
the
change
in
zesponse
for
each
increment
of
change
until
the oscillation
ceases.
If
no
oscillatio
n
occurs, it
is
permisSible to operate at
maximum GAIN.
5.7
WEITED
PARTS
_.--:
Since the sensor comes in
contact
with the
sample
,
it
:aright
be important to know
sensors
material
of
con-
struction of these wetted parts. The wetted parts of
the
S1
and
82
include
;
Rigid polyurethane isofoam
(closed
cell)
securing
Plastic mylar foam
protector
•
Silicon
rubber
adhesive (RTV)
Glass plate optics protector (S2
only)
•
Non-anodized
aluminmn
inside
sensor
cap
• Brass (standard) or
stainless
steel (optiorial)
com-
pression
wit
h
teflo
n
tape
5.8
SUGGESTEDSPAREPARTS
EdgeTech recommends that
equipment
be
returned to
the
factory
for
repairs
and part
replacements
.
However,
it is recogoized that some users are
trained
to
make
repairs
and
part
replaceme:ms
in
the
:field.
In
these
cases,
Edge
Tech
can
suggest spare parts that
may
be
needed
in
infrequent
circumstances.
resulting in improved
dynamic
perfonnance.The
fre-
quency response of this
compensation
network is
such
that it
is
effective only at dew points of 0°C
and
above.
The
COMPENSATION
control
has
been set at
the
factory
for optimum
dynamic
response
when
operating
at
high dew
points
and should not have to be
adjusted.
Before making
adjustments
to the
COMPENSATION
control,
always record the
factory-set
positio
n
to
aid
in
renJTTJin
g
to the original position at
a
l.at.er
date.
How-
ever
,
proper
adjustment
of the
COMPENSATION
control
may.
be
achieved
by
introducin
g
a
gas
sample
into the Sensor at the
highest
dew point
anticipated. With
the
instrument
operatin
g
nomWly
on this dew
point,
rotate
the
COMPENSATION
control fully
counterclock-
Part
Number
C905
7-00007
C9057-00038
D9057-00036
A31966
2000-Sl
2000-S2
Dl6118-16
B24264
C23585
C24359
B24461
Description
Front PCB with
switch
matrix
Rear
PCB
Main
PCB
EPROM, customized
Sl
Sensor,
1-stage,
450C
depression
S2 Sensor,
2-stage,600C depression
Cleaning
kit with
fuses
Cover,
bolt-on,
for
2000-Sl sensor
Cover,
screw-on,
for
2000-S2 sensor
Ambient
Temperature
PCB
,
Model
2002only
Ambient
Temperature
probe,
Model
2002only
5-4
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