RKI Instruments SM-2009U - Manual (Page 37)

Calibrating Instruments • 33
• When Cal Limit Display is set to On and Cal. Limit Check is
set to Confirm to use, if the GX-2009 is due for calibration the
unit will show the following screen and beep and flash the LED
arrays for a few seconds indicating that calibration is due.
When the beeping and flashing stops, press and release the
POWER MODE button on the GX-2009 to continue. The unit will
now connect to the program, the TRANSMIT screen shown in
step 6 above will be displayed, and the CHARGE LED will begin
to blink green.
8. Verify that the appropriate calibration gas cylinder is connected to
the CAL. GAS fitting on the back of the SM-2009U. See
“Connecting Calibration Gas” on page 22 for calibration gas
cylinder options and calibration gas connection procedures.
9. Press and hold the CAL. ▲ button for at least one second, then
release it. The calibration begins. During the calibration, the CAL.
LED will flash yellow indicating that a calibration is in progress and
the GX-2009 display will show the current gas readings.
10. The SM-2009U will apply fresh air to the instrument for the time
defined by the air sample time parameter.
11. The SM-2009U will perform a fresh air adjustment on the
instrument.
12. If the air adjustment is successful, the SM-2009U will continue as
described in step 13 below.
If one or more of the sensors fails the fresh air adjustment, then the
SM-2009U will abort the calibration and will not apply calibration
gas. If this happens, the CAL. LED will turn steadily red indicating a
CAL
C--LIMIT
0 20.9
CAL
CO ppm H2S ppm
CH4 %LEL OXY vol%
0 0