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4. When the calibration is finished, press the DATA key to make sure that the
display is reading correctly.
(D) Stack Draft Calibration
To obtain a span calibration of the draft sensor, connect a manometer to the end of
the probe through a T fitting. Leave one side of the T open. Restrict the open side
of the T with a suitable plug or valve. In the SPAN MENU, use the UP & DOWN
keys to select a suitable draft calibration span between 5" and 10". Press the
ENTER key. The pump will be on and the display will read:
Very slowly start closing the intake valve of the apparatus and observe the
manometer reading climbing. Set the valve opening as soon as the manometer is
reading the same pressure as that selected on the display. Press the ENTER key
again. The draft sensor will be calibrated to the value shown on the display.
3:59
Feed 300ppmNO
Shift to Abort
Press
Enter @10" H2O
Shift to Abort
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