RKI Instruments GD-K7D2 (24 VDC) User Manual
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10 • Model GD-K7D2 (24 VDC) Sample Draw Transmitter
CAUTION:
Avoid loops or slumps in the incoming sample line. To reduce response time, keep the
incoming sample line as short as possible. See the Table 2 above for maximum sample
tubing lengths.
5.
Attach 4 mm I.D. x 6 mm O.D. Teflon PTFE sample tubing to the gas out fitting. Route
the opposite end of the tubing to an open area where the sample can safely disperse or
to an exhaust duct.
Wiring the GD-K7D2 to a Controller
WARNING: Always verify that power to the GD-K7D2 and to the controller are off and
that the controller’s and GD-K7D2’s power switches are in the off position
before making wiring connections or adjustments.
1.
Turn off power to the controller and the GD-K7D2.
2.
Place the controller’s and GD-K7D2’s power switches in the OFF position.
3.
Guide a three or six conductor shielded cable through the cable bushing at the bottom
of the GD-K7D2 installation unit.
A three conductor cable is used when the GD-K7D2 is wired to a controller that does
not have flow alarm circuitry and flow alarm terminals for connection to the GD-
K7D2 (see Figure 8 below). In this case, a jumper is factory installed between the
second and third terminals from the right and the fourth and seventh terminals from
the right. If these jumpers are not installed and the GD-K7D2 is being connected to a
controller without flow alarm terminals, install 20 gauge wire to make these jumper
connections.
A six conductor cable is used when the controller has flow alarm circuitry and flow
alarm terminals for connection to the GD-K7D2 (see Figure 9 below).
CAUTION:
Leave the cable shield’s drain wire insulated and disconnected at the GD-K7D2. You
will connect the opposite end of the cable shield’s drain wire at the controller.
4.
Connect three or four wires between the GD-K7D2 and the controller as shown in
Figure 8 or Figure 9 depending on the controller used.
CAUTION:
At the controller, do not route power and GD-K7D2 wiring through the same
conduit hub. The power cable may disrupt the transmission of the GD-K7D2’s
signal to the controller.
NOTE:
The controller connections shown are typical. See the controller Detector Head
Specification Sheet for the GD-K7D2 or a controller specific wiring diagram for
the GD-K7D2 for connections specific to the controller.