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2. To span the monitor:
a. Remove the protective plastic cap from the SPAN GAS cylinder, noting
the concentration of carbon monoxide printed on the cylinder.
b. Connect the plastic tubing provided in the kit to the plastic fitting, and
connect the opposite end of the tubing securely to the barbed fitting on
the regulator.
c. Connect the monitor's sample tube to the proper end of the
tubing/regulator assembly, described in the previous step.
d. Locate the SPAN adjustment potentiometer and verify the monitor has
had adequate warm-up time (see CO Monitor's User Instructions).
e. Screw the regulator valve onto the SPAN GAS cylinder outlet, making
sure not to "cross thread" the regulator or cylinder outlet port, and
tighten the regulator firmly. Open the knob on the regulator
counterclockwise to start gas flow.
f. Observe the display on the monitor. The reading will increase, and
then stabilize. As soon as the reading is stable (approximately one
minute), compare the value indicated on the display, with the value
noted on the SPAN GAS cylinder. If the display does NOT read the
same value as noted on the SPAN GAS cylinder, adjust the SPAN
potentiometer until the reading indicated on the display matches the
concentration of carbon monoxide printed on the SPAN GAS
calibration cylinder.
g. When these steps have been completed, close the knob on the
regulator clockwise to stop the gas flow. Unscrew regulator valve from
the SPAN GAS cylinder and replace the protective plastic cap.
h. Disconnect the associated calibration test tubing from the monitor and
reconnect the monitor's sample tube to the sampling supply on the
filtration system.
i. When using the small kit (part number 529-04-49 or automotive part
number 72012), be aware that the regulator valve allows gas to flow
from the cylinder as soon as it is tightened down. To conserve the gas
in the cylinder, do not attach the regulator valve until you are ready to
begin spanning the monitor and remove the regulator valve as soon as
spanning is complete.