Calibrating GX-2012s and Gas Tracers • 204
10. If a bump test or calibration has already been performed by the PC Controller
program on a GX-2012 or a Gas Tracer with a %volume sensor installed, the
docking station will perform a purge before beginning the calibration. The
purge ensures that any %volume calibration gas does not come in contact with
the ppm sensor and affect its readings. The screen will indicate that you need
to remove the gas cylinder from the GAS 2 fitting on the back of the SDM-
2012.
If the previous instrument tested did not include a %volume sensor, the
program will proceed as described in step 14.
11. Remove any connected cylinder from the GAS 2 fitting and click the Purge
button. The SDM-2012 will purge for 30 seconds.
12. At the end of the purge cycle, you will be prompted to reconnect the calibration
cylinder to the GAS 2 fitting.
13. Reconnect the ppm calibration cylinder to the GAS 2 fitting and click the
Calibration button.
