RKI Instruments SDM-2012 Standalone Configuration - Manual (Page 86)

81 • Calibrating a Gas Tracer
• If the ppm sensor fails the fresh air adjustment, the SDM-2012 will abort
the calibration and will not apply calibration gas. If this happens, the
CAL
S
LED will flash red indicating a failure and the following screens will
alternate.
In this case continue with step 28.
19. The SDM-2012 will apply GAS 2 calibration gas to the ppm sensor for the time
defined by the GAS TIME calibration parameter. Be sure that the 1000 ppm
methane calibration cylinder is connected to the GAS 2 fitting.
20. The SDM-2012 will then apply fresh air to the standard three sensors and
%volume sensor (if installed and if the GAS menu item in Edit Mode is set to
ALL) for the time defined by the AIR TIME calibration parameter.
21. The SDM-2012 will perform a fresh air adjustment on the standard three
sensors and %volume sensor (if installed and if the GAS menu item in Edit
Mode is set to ALL).
• If the air adjustment is successful, the SDM-2012 will continue as
described in step 22 below.
2500
CH 4
ZERO NG
ppm
F
CH
4
ZERO NG
ppm
9800
ppm
CH 4
CAL G2
0
20.9
5
vol%
%LEL
%
ppm
CH
4
O
2
CAL AIR
CO