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14 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.
15 With H2 displayed,
press and release the
POWER button. The gas
reading will begin to
flash.
16 Apply calibration gas
for 1 minute.
Depending on your
calibration kit, you will need
to either:
a. Connect the gas bag
tubing to the
instrument’s inlet or
b. Connect the tubing
from the demand flow
regulator to the
instrument’s inlet.
17 Use the AIR and MODE
buttons to adjust the
gas reading to match
the value listed on the
calibration cylinder.
18 Press and release the
POWER button. The
instrument will perform
a gas adjustment and
will return to the
MANU_CAL menu item.
