RKI Instruments GX-2001 Data Logging with Calibration Station - Manual (Page 51)

Calibrating the Model GX-2001 with the Calibration Station • 51
Flow Rate
The recommend flow rate for fresh air flow is 1.0 SCFH. and 0.8
SCFH for span gas flow. The low flow alarm is set at 0.4 ± 0.1
SCFH, and will sound if the flow rate reaches this level. If the
flow rate drops below the recommended flow rate during
calibration, you can adjust the flow rate by making adjustments
using a flat head screw driver to either the Fresh Air Flow Adjust
Valve or the Span Gas Flow Adjust Valves on the back of the
GX-2001 Calibration Station.
The low flow alarm setting is factory set and should not require
field adjustment. If adjustment is required, see the Maintenance
section below for instructions.
Calibration Failure
Under most circumstances, calibration should proceed
smoothly. Should a calibration failure occur, it would be due to
one of four reasons:
• The calibration adapter was not locked onto the GX-2001
during calibration.
• If you attempt to calibrate the Model GX-2001 without
applying the span gas.
• If you do not set the auto calibration values in the Set window
to match the concentration of the span gas in the cylinder,
this may result in a calibration failure. Make sure these values
are the same for an accurate calibration.
• One of the sensors in the Model GX-2001 could have
malfunctioned and needs replacing. If the span gas has been
applied and the auto calibration values are the same as the
span gas concentrations in the cylinder, then it is likely there
is a problem with one of the Model GX-2001 sensors. Refer
to the Model GX-2001 Operator’s Manual for more
information about the sensors in the Model GX-2001 and how
you can change them.