RKI Instruments GD-K7D2 (115 VAC) - Manual (Page 17)

Model GD-K7D2 (115 VAC) Sample Draw Transmitter • 13
4. Verify a reading of 4.0 mA on the milliampmeter. If necessary, use the zero pot to
adjust the milliampmeter reading to 4.0 mA.
CAUTION: Do not adjust the span pot at this time unless a full calibration is performed. The
GD-K7D2 is factory calibrated before shipment.
5. Remove the milliampmeter test clips.
6. Slide the housing cover over the detection unit and installation bracket, then tighten
the thumbscrew at the front of the cover to secure the cover to the installation bracket.
Operation
Normal Operation
During normal operation, the GD-K7D2 will draw sample from the sample area and send
the target gas reading to the controller via a 4 - 20 mA signal. The flowmeter ball should be
between the two red lines. If the flowmeter ball is out of the red lines, use the flow
adjustment pot to adjust the flow.
Low Flow Alarm
If the GD-K7D2’s flow rate drops low enough so that the flow ball is at the bottom of the
flowmeter, the GD-K7D2 will go into low flow alarm after a delay of about one minute.
When it is in low alarm, the flow light will turn off.
If the controller is the type that does not have flow alarm terminals, see Figure 8, then the
GD-K7D2 will interrupt the 4 - 20 mA signal to the controller. This will cause the
controller to indicate a fail alarm.
If the controller is the type that has flow alarm terminals, see Figure 9, then the GD-K7D2
will cause the controller to go into low flow alarm. See the controller instruction manual
for more information.