RKI Instruments GD-K7D2 (24 VDC) - Manual (Page 23)

Model GD-K7D2 (24 VDC) Sample Draw Transmitter • 19
8. A metal snap-on bracket holds the pump in place. A tab on the bracket is accessible on
the right side of the detector unit. Push the bracket tab back and away from the pump
until the bracket snaps back and releases the pump.
9. Gently pull the pump towards the back of the detector unit until it disengages from
the detector unit.
10. Disconnect the pump cable from the pump connector on the main board in the top of
the detector unit and remove the cable from cable retainer near the connector. Note
how the cable is routed to the connected.
11. Connect the new pump’s cable to the pump connector and route the cable through the
cable retainer like the old pump’s cable.
12. Install the new pump into the detector unit and snap the retaining bracket back on.
13. Reinstall the detector unit into the installation bracket.
14. Reinstall the GD-K7D2 cover.
15. Turn on power to the controller and turn on the controller.
16. If providing 24 VDC to the GD-K7D2 from a source other than the controller, turn on
the power source.
17. Place the ON/OFF switch in the ON position.
18. Verify that the flow ball in the flowmeter is between the two red lines. Adjust the flow
with the flow rate pot if necessary.
Replacing the Lithium Battery Pack
NOTE: Change the lithium battery pack with the controller on and the GD-K7D2 on
power and operating. If power to the GD-K7D2 is turned off to change the
battery pack, the gas readings may be unstable for a short time when power is
restored.
1. Loosen the thumbscrew on the front of the housing cover, then remove the cover from
the detection unit and installation bracket.
2. Carefully pull the lithium battery pack away from the detector unit. It is installed in
the detector unit with a strip of Velcro tape.
3. Carefully disconnect the battery pack cable connector from the main board by pulling
it straight down, away from the main board. Do not touch the main board.
4. Carefully plug the cable connector from the new battery pack into the battery pack
connector on main board. Do not touch the main board.
5. Install the new battery pack in the detection unit.
6. Reinstall the GD-K7D2 cover.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 to 6 months is adequate for most applications. Unless
experience in a particular application dictates otherwise, RKI Instruments, Inc.
recommends a calibration frequency of every 3 months (quarterly).
If an application is not very demanding, for example detection in a clean, temperature
controlled environment, and calibration adjustments are minimal at calibration, then a