RKI Instruments GX-2001 Data Logging with Calibration Station - Manual (Page 55)

Maintaining the GX-2001 Calibration Station • 55
Adjusting the Low Flow Alarm
The factory set low flow alarm setting is 0.4 SCFH (±0.1). The
low flow alarm can be adjusted using the low flow adjustment
screw, which is located in the upper left corner of the back panel.
It is accessible through a hole in the panel. Use a small flathead
screwdriver to make the adjustment. To adjust the low flow
setting, do the following:
1. Follow the instructions in the Manual Calibration section
above, but do not connect a calibration gas cylinder to the
calibration station.
2. After you press the Cal. Unit Calibration button, as soon as
the Calibration Station begins to drawing fresh air, continue
with step 3.
3. Use the fresh air flow adjustment valve on the back panel of
the Calibration Station to set the flow to 0.4 SCFH.
If the Calibration Station goes into low flow alarm before you
can adjust the flow down to 0.4 SCFH, adjust the low flow
adjustment screw 1/4 turn clockwise, then attempt to set the
flow again. Repeat this step until you are able to adjust the
flow to 0.4 SCFH.
4. Slowly turn the low flow adjustment screw counterclockwise
in very small increments and wait 5 seconds after each
increment to see if the Calibration Station goes into low flow
alarm. Continue this process until the Calibration Station
goes into low flow alarm.
5. Increase the flow using fresh air flow adjustment valve until
the unit is out of low flow alarm.
6. Decrease the flow very slowly and verify that the low flow
alarm is 0.4 SCFH (±0.1).
7. If the low flow alarm is set too high, turn the low flow
adjustment screw slightly clockwise. Repeat steps 5 and 6.
If the low flow alarm is set too low, turn the low flow
adjustment screw slightly counterclockwise. Repeat steps 5
and 6.