CAIRE HELiOS Plus Technical & Service Manual page 51

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registers on the test flowmeter. Verify a pressure reading
of .038-.043-in. (.097-.109-cm) H2O vacuum on the
Magnehelic gauge.
7. If the Magnehelic gauge reads less than .038-in. (.097-cm)
H2O when oxygen flow first registers in step 6, adjust the
demand flow control valve as follows. With the H300 or
H850 laying flat on the work table, position the top one
third of the unit over the edge of the table. Insert a T10 Torx
driver through the small hole in the rear side cover above
the contents indicator window. Slowly turn the demand flow
control valve set screw about 1/16 turn clockwise. Repeat
steps 6 and 7 until you achieve the desired results in step 6.
8. If the Magnehelic gauge reads more than .043-in (.109-cm).
H2O when oxygen flow first registers in step 6, adjust the
demand flow control valve asfollows. With the H300 or
H850 laying flat on the work table, position the top one
third of the unit over the edge of the table. Insert a T10 Torx
driver through the small hole in the rear side cover above
the contents indicator window. Slowly turn the demand flow
control valve set screw about 1/16 turn counter clockwise.
Repeat steps 6 and 8 until you achieve the desired results in
step 6.
9. Reorient the Helios Portable to the vertical position and in-
crease the adjustable oxygen pressure regulator until the
Magnehelic gauge reads .080-in. H2O. Verify that the test
flowmeter reads about 2 L/min with the flow control set at
the D4 or 4 demand position. Decrease the regulator pressure
until the Magnehelic gauge reads 0-in. H2O. Verify that the
test flowmeter reads 0 L/min.
10. Disconnect the test setup from the H300 or H850 and con-
nect a new dual-lumen cannula to the Helios Portable oxygen
outlet and sense connectors. Adjust the cannula to your face
and breathe normally. Verify that oxygen flow distinctly cy-
cles on during inspiration and off during exhalation.
11. Cycle the demand flow control valve 25 times with the dual-
lumen cannula connected. Disconnect the cannula and verify
that there is no flow through the oxygen outlet connector.
12. Connect the test setup. Repeat step 6 and verify that the
demand flow control valve sensitivity is in the acceptable
range.
HELiOS Portables Technical Service Manual • PN 20562190 Rev E
50