Configuration User Manual

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

CH4

ZERO NG

ppm

CH4

ZERO NG

ppm

9800

ppm

CH4

CAL G2

20.9

vol%

%LEL

ppm

CH4

CAL AIR