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Use the AIR and MODE
buttons to adjust each
character and press the
POWER button to move
to the next character.
5 The AIR CAL menu item
will be displayed.
6 Use the AIR or MODE
button to scroll to the
AUTO CAL menu item.
7 Press and release the
POWER button. CH4 will
be displayed. This
version of the SP-220
needs to be calibrated
to both methane (CH4)
and hydrogen (H2). Use
the AIR or MODE button
to toggle between the
two gas selections.
8 With CH4 displayed,
press and release the
POWER button. The auto
cal value will be
displayed.
