RKI Instruments GD-K7D2 (24 VDC) - Manual (Page 16)

12 • Model GD-K7D2 (24 VDC) Sample Draw Transmitter
7. Connect the cable shield’s drain wire to an available earth (chassis) ground at the
controller. The grounding screw on each controller conduit hub is an example of an
earth (chassis) ground.
Assembling the GD-K7D2
1. Position the detection unit so the unit’s main circuit board is aligned with the socket
near the top of the installation unit and the internal plumbing is aligned near the
bottom of each unit.
2. Push the detection unit into the installation bracket so the main circuit board plugs
into the socket.
3. Tighten the captive screw in the lower left of the detection unit that secures the
detection unit to the installation bracket.
Start Up
This section describes procedures to start up the GD-K7D2 and place it into normal
operation.
Introducing Incoming Power
1. Complete the installation procedures described earlier in this manual.
2. Verify that the power wiring is correct and secure for the GD-K7D2 and the controller.
3. Turn on or plug in the incoming power to the controller.
4. Turn on the controller
5. If providing 24 VDC from a source other than the controller (see Figure 9), turn on or
plug in the incoming DC power to the GD-K7D2.
6. Place the GD-K7D2’s power switch in the ON position.
7. Verify that the flowmeter ball is between the two lines on the flowmeter. If necessary,
use the flow rate potentiometer to adjust the flow rate, so the flowmeter ball is
between the two lines.
8. Verify that the incoming sample line is not leaking. To test the sample line, plug the
open end of the sample line with your thumb. If the flowmeter ball drops to the
bottom of the flowmeter, the incoming sample line is not leaking.
CAUTION: Allow the GD-K7D2 to warm up for 30 minutes (2 hours for ammonia units) before
you continue with the next section. If the lithium battery pack is dead and the GD-
K7D2 has been off power for an extended period of time, allow the GD-K7D2 to
warm up overnight.
Setting the Zero Signal
CAUTION: If you suspect the presence of toxic gas in the monitoring environment, use the
calibration kit and the zero air calibration cylinder to introduce “fresh air” to the
sensor and verify an accurate zero setting.
1. Verify that the GD-K7D2 is in a fresh air environment (environment known to be free
of toxic and combustible gas and of normal oxygen content, 20.9%).
2. Unscrew the captive thumbscrew on the front of the cover and remove the cover from
the GD-K7D2.