Model2000
Series
DewPrime
Dew Point
Hygrometers
-----------
Operating Instructions
----------
3.3 FRONT PANEL KEYPAD
OPERATION
MODE: The
MODE
key controls the panel
display.
Pressing the
MODE
key will indicate various
measure-
ment parameters,
depending
on the model
configuration
and selected
options.The
(*)
indicates
a
measurement
parameter
available
only on the Model 2002. Selecting
a
particular display does not change the output on
the
analog or digital
signal
.
If the display
indicates
.
.
•
The
measurement
is
.••
xxx.x
C D Dew/frost point °C
xxx
.
x
F D Dew/frost point
Of
xxx.x GR
Grains
per pound
xxx(
.
)x
PM
Parts per
million,
by volume
xxx
.
x
C
T Ambient Temperature
OC*
xxx.x C
T
Ambient
Temperature
VF*
xxx.x RH Relative Humidity,
%*
FUNC:
This
key allows the viewing and changing of
a
number of
eter
s
.
The
first press of this key
displays
TIME
.
The
VIEW key
shows
the time and allows
the
user to change
it
.
Pressing
FUNC
instead
of VIEW
accesses the next ftmction and displays DA1E.Press
VIEW to
view/change
the date or press FUNC again
to
go to the next function,
AVE
.
This
represents the
nmnber
of temperature
readings
to be averaged in order
to
compensale for short-term
changes
in
temperature.
The
next ftmction after AVE is
BAUD,
in which the
baud
rate
for RS-232
communication
is set. Allowable
values
are
300, 1200,
2400,
4800, 9600,
19200.The final
parameter
lDlder
FUNC is our INT, which sets
the
output interval, in
seconds
,
between
RS-232 outputs.
A
value of 0 for our INT results
in
no RS-232 data
output.
MABC: Begins a manual ABC cycle. If the
Model2000
Series is
already
in an ABC
cycle,
this
key restarts the
ABC
cycle
.
P
ABC
:
This key is
multifunctional,
allowing
viewing
and
changing of three
parameters
related to the
ABC
cycle.The first press of the key
displays
ABC
ST.
Pressing VIEW
allows viewing
or cban Png the
ABC
start
time,
displayed
in
hours
and minutes
(
e.
g
.
,
08
45).
If
PABC is pressed again,
instead
of
VIEW
,
ABC
n-IT
is
displayed
.
This
is the interval, in hours and
minutes,
between ABC
cycles
.
If
ABC
ST
=
00
00 and ABC n-IT
=
00
00, ABC is not performed. If only
ABC
INT
=
00
00, then there is one ABC at ABC ST
time.
The
next
function of the PABC key is the HOLD ftmction..
Pressing PABC after ABC INT displays the status
of
hold
(HOlD
ON or HOLD
OFF).
Pressing
VIEW
toggles the status
ofHOLD
.
IfHOL
D
is
ON
,
the
temperature
just before the beginning of an ABC
is
output on the RS-232 port and the analog output
port,
and held until the ABC cycle is completed. The
front-
panel LED display shows the true
temperature
during
the
entire ABC
cycle
.
If
HOLD is OFF, the front
panel
LED,
the RS-232 output, and the analog output
continue
to
reflect the true
temperature
during the
cycle.
HEAT
:
This key toggles the
MAX
HEAT
mode
,
during which the control loop is bypassed and
the
minor is heated. The front panel LED flashes a
letter
"H" and the RS-232 output indicates MAX
HEAT.
. During an ABC cycle, MAX HEAT (MAX COOL)
does not fimction..
COOL:
As above, but toggles the MAX
COOL
mode
and flashes a
letter
"C'
on the LED display.
NOTE
Turning on MAX HEAT turns
off
MAX COOL and vice versa;
both
cannot be activated
simultaneously.
OUT
:
This key allows
the
user
to
view
and
change the
scaling
range of the
0-5
VDC and 4-20 ma
analog
outputs. The user can
simultaneously
output any
one
of
the available measurement parameters on both
analog
outputs
.
If
the
instrument
has
more than one
measure-
ment
parameter
available (such as the
Model2002),
only
one of those parameters can be
assigned
to each
of
the outputs. The user selects the measurement
parameter
and
dedicates
both ouputs
to
that
parameter
.(Remem-
ber,the RS-232
serial
commlDlication will output
all
measurement
parameters at the same
time.)
To scale the analog
outputs:
1. Press the OUT key until
th
e
desired
measurement
paramete
r
is displayed on the front panel.
The
instrmnent
must
be
configured with a
particular
3-3
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