30 • Calibrating a GX-2009
a USB flash drive.
20. Remove the GX-2009 from the SDM-2009.
21. If you wish to bump test additional instruments, repeat step 5 - step 20 above
for each additional instrument.
Calibrating a GX-2009
The following instructions apply to GX-2009s with one or more of the standard four
sensors (catalytic LEL, O
2
, CO, and H
2
S).
When a calibration is performed, the docking station performs a fresh air adjustment
on an instrument and then applies calibration gas to the instrument. The docking
station analyzes the calibration results and determines if the instrument passed the
calibration.
To perform a calibration on a GX-2009:
1. Confirm that the AC adapter is connected to the SDM-2009 and to an AC wall
socket.
2. Press and hold the SDM-2009’s POWER button. The LEDs will turn amber.
3. When the BUMP
and CAL
LEDs turn off, release the POWER button.
4. The COPY LED will be off or on steadily and the CHARGE LED will be blinking
green if the SDM-2009 is operating properly or solid red if there is a system
failure. The amount of free memory in the SDM-2009 will dictate the condition
of the COPY LED (see “Available Memory in the SDM-2009” on page 39).
5. Install a GX-2009 in the instrument cradle.
NOTE:
If the GX-2009 is left in the SDM-2009 after bump testing or calibration,
the pump will run for 12 seconds every 2 minutes in order to keep
hydrogen generated from charging of the NiMH batteries from affecting
the CO sensor.
6. Press and hold the POWER MODE button on the GX-2009 until you hear a
beep, then release it. The GX-2009 will begin its power up sequence (see
exceptions below in step 7). If a successful connection between the instrument
and the SDM-2009 occurs, the home screen will appear on the instrument
display at the end of the startup sequence. The auto calibration values for all
installed sensors will be displayed. If the charge LED was amber, it will begin
to blink green.
50 12.0
TRANSMIT
CO ppm H2S ppm
CH4 %LEL OXY vol%
50 25.0
