Manual box control allows you to turn gasses on and off (thus purging gasses). This is used prior to calibration, if the line has not been under pressure since the last calibration (e.g., gasses were turned off or a cylinder was changed), or to perform a function check on the SpanBox.
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To purge the SpanBox:
a. Tap the Menu button.
b. Tap Manual Box Control.
c. Tap the checkbox for the highest input port (gas) and output port 6.
d. Count to 10 with the gas flowing.
e. Repeat for all input ports (high to low) on output port 6.
f. Tap Done.