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DRc-91C/93C
mounting clips that secure the
5. Position
the
9215
connector
J11
blank cover plate to the
plate in the appropriate opening
interface opening and remove the
and secure it in place using the
plate.
(Note: some early DRC-
screws provided.
91Cs
do
not
have
the
J11
opening.
Use
the
J9
8229
6 .
Install the calibration cover by
Scanner option opening.
If an
reversing procedure 2.
8229 is present move the 8229 to
the
J10
RS-232 slot.
7 .
Select either the 9215-15 or
9215-150
configuration
by
3.
If
an
Input
Card
must
be
pressing
t h e
appropriate
removed, disconnect the wiring
pushbutton switch.
harness
mating
connector
by
lifting the
locking tab on the
8 .
Install the top panel.
Input
Card
connector and gently
pulling
on
the body
of
the
wiring harness mating
connec-
9 2 1 5 . 5 SENSOR
CONNECTIONS
tor.
9215 Capacitance
Input Card
The 9215 connector plate supplies
4. Plug the new Input
C a r d
into the
two independent dual isolated BNC
A
Input Card Slot 5 or the B
connectors for the sensor connec-
Input
Card
Slot
6
with
the
tions.
A
four lead measurement is
component side to the left of
used
to minimize the effect of
the unit as viewed
from the
series resistance on the capaci-
front
.
Connect
the
wiring
tance
measurement.
Since
the
.
harness mating connector to the
capacitance sensor is non-polariz-
card making sure that the wiring
ed, one pair should be used for the
harness locking tab is seated
current connections and the other
over the extended edge of the
pair for the voltage connections.
wiring harness mating connector.
The pin contact of the connector is
Verify that the wiring harness
+
and the socket
-.
is in place correctly by noting
that the
"A"
or
"B"
on the
harness
mating
connector
is
9215.6 SELECTION OF
THE
SIGN OF
THE
the harness installation again).
Thread the wiring harness along
The temperature coefficient of some
the rear edge of the unit and
Capacitance Sensars can be positive
slip it into the harness strain
or
negative
depending
on
the
relief
on
the
rear
panel.
temperature range.
The 9215 Card
Thread the 9215 internal cable
produces a voltage proportional to
along the inside edge of the
the Capacitance which is sent to
rear panel so that it won't
the control circuitry of the DRC-
interfere with the installation
91C/93C to be compared to a user
of the calibration cover or top
selected setpoint.
For control to
cover.
operate properly, the sign of the
voltage must reflect the tempera-
- :
Be sure
that
the card
is
ture coefficient of the sensor.
It
centered
i n
the slot.
The
harness
is
necessary
for
the
user
to
will have a
tendency
to push the
determine which range the sensor is
card
forward
and
may
in
some
in and to inform the controller of
instances
cause
the
card
and
the
sign
of
the
temperature
instrument to not behave properly.
coefficient.
This is accomplished
on the DRC-91C by a switch (switch
1
of the SENSOR ID) on its rear
92
15-4
COPYRIGHT 2/88 LSCI
facing up (if it is not, review
TEMPERATURE
COEFFICIENT
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