7
Particulate Contamination:
The sen-
sors should be shielded from partic-
ulate contaminants.
Chemical Contamination:
The sen-
sors should not be exposed to corro-
sive or reactive chemicals.
Fahrenheit / Celsius
The DPX-200 can be user-
configured to display either Fahren-
heit or Celsius readings on the
computer. Simply move the jumper
shown on Page 4 to the position for
the desired readings. Please note
that whenever this jumper is
moved, the setting will not be imple-
mented until the unit is reset by re-
moving power and then reapplying
it.
Be careful not to remove the
jumper marked on Page 4 as Cali-
bration Lockout. This jumper keeps
the calibration points locked in; re-
moving it can cause the DPX-200 to
lose calibration.
Communications Commands
Commands can be typed in upper
or lower case characters (older
DPX-200’s require commands to be
typed in upper case only).
C
n
<
Enter
> Set auto data transmit
interval for displayed
readings to
n
seconds
(
n
is a number from 0
to 32767). For
n
=0, 1,
and 2, automatic trans-
mission is turned off.
Default value is
n
=3
seconds.
Note
: To enable the screen to dis-
play what you are typing, go to the
menu bar in Tera Term, click on
Setup
, select
Terminal
, and
checkmark the “Local Echo” box.
SENSOR PRECAUTIONS
Under normal operating conditions,
the sensors used by the DPX-200
will maintain calibration specifica-
tions for over five years of continu-
ous use, assuming that the precau-
tions outlined below have been fol-
lowed. However, if used in plastics
drying operations, hydrocarbons
from the out gas of the plastic resin
dryer might condense over time on
the sensor. Eventually the sensor
will have to be replaced. To main-
tain NIST traceable certification, the
unit should be returned to Ohmic
Instruments Co. for sensor replace-
ment. Ohmic requires that a filter be
used to prevent contaminants from
damaging the sensor. The following
is a list of limits of operation. Ex-
ceeding these limits can cause sen-
sor failure and voids all warranties.
Humidity:
Temperature:
Max. Pressure:
Excitation:
0 to 100% RH - NON CONDENSING
0 to 185°F
175 psig
The sensor current is not to exceed 50µA
Limits of Operation
