99 • Calibrating a Gas Tracer
not wish to calibrate the ppm combustible sensor, leave the GAS 2 box
deselected.
The SDM-2012 will calibrate the ppm sensor using the Gas Tracer’s WET
setting for the fresh air adjustment and the span adjustment. This is not user
adjustable using the PC Controller Program. If the SDM-2012 is not in a fresh
air environment, a zero air cylinder must be used with a 6 inch humidifier tube
connecting the cylinder to the AIR fitting. Another 6 inch humidifier tube must
always be used to connect the calibration gas cylinder to the GAS 2 fitting. See
the Gas Tracer Operator’s Manual for a description of the DRY and WET
settings for bump testing and calibration.
NOTE:
If you are performing a biannual calibration of the ppm sensor, perform
a DRY zero adjustment with the instrument alone as described in the
Gas Tracer Operator’s Manual. Then connect the Gas Tracer to the PC
Controller program and perform a WET zero adjustment and WET
span adjustment.
Figure 78: Gas Order Confirmation Screen, Standard Gas Tracer