RKI Instruments GX-2012 Manual - Manual (Page 171)

GX-2012 Operator’s Manual Preparing for Calibration or Bump Testing • 163
4. Continue to hold the AIRS button until the display prompts you to
release it. The GX-2012 will count down from 8 as it sets the fresh air
reading for all channels. If the combustible channel is set as %LEL only
or vol% only, there is no countdown period. The fresh air reading is set
immediately.
5. Slide the tubing clamp onto the tubing and connect the tubing onto the
sample bag’s inlet. Leave the clamp unclamped for now.
6. Connect the other end of the tubing to the regulator’s or dispensing
valve’s hose barb fitting.
7. Fill the gas collection bag by screwing the fixed flow regulator onto the
calibration cylinder or by screwing the dispensing valve onto the
calibration cylinder and turning the knob counterclockwise.
NOTE: If the regulator has no on/off knob, then gas will begin to flow at 0.5
LPM as soon as the regulator is connected to the cylinder.
8. Allow the gas to dispense until the gas collection bag is a little over half
full.
9. If a fixed flow regulator without a knob is used, disconnect it from the
cylinder and immediately clamp down the hose clamp to prevent the
release of gas from the gas collection bag.
If a fixed flow regulator with a knob or a dispensing valve is used, turn
the knob clockwise to stop the gas flow, clamp down the hose clamp and
remove the regulator or dispensing valve from the cylinder.
10. Disconnect the tubing from the regulator or dispensing valve.