Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F
31
Hi Flow Stroller
Repair Procedures
X
RP24– Flow Rate Testing (Figure 20)
a. Unit must be at least 1/2 full with correctly saturated LOX.
b. Set FCV to 2 LPM setting and allow unit to operate for 20–60
minutes.
c. Connect FCV outlet (Item N) to flowmeter inlet (Item M)
with respiratory tubing. Make sure flowmeter outlet is open,
unobstructed, and properly positioned.
d. Test flow rate at each FCV position. Record all flow rates.
e. Flow rates must be nominal valus within tolerances listed in
specification section of this manual or unit fails flow rate test.
RP25 – Operating Pressure Test (Figure 20)
a. Assemble pressure gauge and adapter assembly (Item J).
Thread hose barb onto pressure gauge (use Teflon
®
tape).
Push tubing onto hose barb and attach with clamp.
b. Connect gauge assembly (Item J) to hose barb on FCV outlet.
Open FCV (Item 24) to highest flow setting.
c. Read operating pressure on pressure gauge (Item J).
d. Operating pressure must be 18-22 psig (1.2-1.5 bar) or unit
fails test.
RP26 – Flow Meter Verification
a. Flow meter accuracy is best verified by a calibration labora-
tory. Equipment should indicate liter per minute oxygen gas
at atmospheric pressure and 21°C (70° F).
b. Flow meter accuracy may also be tested by comparison to one
or more new, unused, calibrated flow meters. This method
will increase confidence in accuracy of readings, but not nec-
essarily verify accuracy.
NOTE: Be careful to allow for accuracy tolerances of flowmeter.
NOTE: If testing operating pressure because of improper flow
rates, test immediately after flow rate test.
24
J
N
M
FIGURE 20: Flow Rate and Pressure Test
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