RKI Instruments SDM-2012 Standalone Configuration - Manual (Page 84)

79 • Calibrating a Gas Tracer
NOTE: Do not use a 4-gas cylinder or any cylinder that includes H
2
S when
calibrating a Gas Tracer. H
2
S adversely affects the ppm combustible
sensor.
11. Press and hold the CAL
S
button until the CAL
S
LED turns on (about one
second) then release it. During the calibration, the CAL
S
LED will flash
amber indicating that a calibration is in progress.
If you wish to cancel the calibration, press and hold the CAL
S
button for at
least one second until CANCEL appears on the screen.
12. If at any point during the calibration the gas flow to the instrument becomes too
low, the calibration will be aborted and the screen will indicate a flow failure.
If a flow failure occurs, confirm all tubing connections are correct and that all
lines are clear.
• To return to the home screen, press and hold the EDIT ENTER button for
about 3 seconds.
• To start another calibration, press and release the CAL
S
button.
• To perform a bump test, press and release the BUMP T button.
13. If a bump test or calibration has already been performed by the SDM-2012 on
a GX-2012 or a Gas Tracer with a %volume sensor installed and if the GAS
menu item in Edit Mode is set to ALL, 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.
- - -
- - -
- - -
%LEL
%
ppm
CH
4
O
2
FLOW NG
CO
GAS2
OFF
PURGE