RKI Instruments GX-2009 Manual - Manual (Page 45)

GX-2009 Operator’s Manual Calibration Mode • 40
Performing a Bump Test in BUMP
NOTE: Bump Test Function must be set to On using the GX-2009 User
Setup Program in order for BUMP to appear in Calibration Mode.
If Bump Test Function is set to Off, BUMP will not appear. See
the GX-2009 User Setup Program Operator’s Manual for
instructions. The factory setting for Bump Test Function is Off.
Entering the BUMP menu item allows you to perform a bump test on all
channels simultaneously to determine if the instrument is responding
properly to gas.
Performing a bump test requires the use of a calibration kit. The procedure
below describes a bump test of all four channels using a calibration kit that
includes a 4-gas calibration cylinder, a 0.5 LPM (liters per minute)
regulator, a calibration adapter plate, and non-absorbent sample tubing.
The standard 4-gas cylinder consists of 50% LEL methane, 12% oxygen,
25 ppm H2S, 50 ppm CO, and a balance of nitrogen. If the H2S channel on
your GX-2009 is active, then use a 4-gas cylinder. If the H2S channel on
your GX-2009 is not active, you may use a 3-gas cylinder to perform the
bump test. The standard 3-gas cylinder consists of 50% LEL methane,
12% oxygen, 50 ppm CO, and a balance of nitrogen. See “Parts List” on
page 66 for available calibration kits and calibration kit spare parts.
NOTE: If your combustible gas channel is calibrated to a gas other than
methane, such as isobutane, use an appropriate gas cylinder to
perform the calibration.
WARNING: Bump test the GX-2009 in a non-hazardous environment.
1. Before performing a bump test, perform a fresh air adjustment as
described in “Performing a Fresh Air Adjustment” on page 30.
2. At the BUMP screen, press and release the POWER MODE button. A
screen appears that displays the gas concentrations that the GX-2009
expects you to use.
BUMP