A5/A3â„¢ Operating Instructions 046-003777-00 4 - 21
Preoperative Tests Flow Control System Test
4.11 Flow Control System Test
WARNING: If N
2
O is available and flows through the system during this test, use a
safe and approved procedure to collect and remove N
2
O gas.
WARNING: Incorrect gas mixtures can cause patient injury. If the O
2
:N
2
O ratio
system does not supply O
2
and N
2
O in the correct proportions, do not
use the system.
CAUTION: Slowly open the cylinder valves to avoid damage. Do not use excessive
force on the flow controls. After performing the cylinder tests, close all
cylinder valves if cylinder supplies are not used.
CAUTION: Turn the flow controls slowly. To avoid damaging the control valves, do
not turn further when the flowmeter reading is outside the range.
When turning a flow control knob clockwise to decrease flow, the
flowmeter should reach zero before the knob reaches its most
clockwise mechanical stop (Off) position. Do not turn any further when
the knob has reached the Off position.
Similarly, when turning a flow control knob counterclockwise to
increase flow from zero, the flowmeter reading should not indicate a
change from zero until the flow control knob is turned approximately
one (1) rotation counterclockwise from the Off position, and only if
permitted according to the gas ratio control system.
To perform the flow control system tests:
1. Connect the pipeline supplies or slowly open the cylinder valves.
2. Turn all flow controls fully clockwise (flow OFF).
3. Set the system switch to the ON position.
4. Do not use the system if the low battery alarm or other ventilator failure alarms occur.
5. Test the O
2
: N
2
O ratio system with change of O
2
flow:
Turn the O
2
and N
2
O flow controls fully clockwise (flow OFF). Then, turn the N
2
O flow control
fully counterclockwise (open position). There should be no N
2
O flow since there is no O
2
flow yet. Turn the O
2
control to the values shown in the table below. The N
2
O value should
meet the criteria shown in the table.
STEP O
2
FLOW SETTING (L/MIN) N
2
O FLOW (L/MIN)
1 0 0
2 0.3 ≤ 1.0
3 0.8 ≥ 2.0 and ≤ 2.5
4 1.0 ≥ 2.5 and ≤ 3.2
5 2.0 ≥ 4.90 and ≤ 6.3
6 3.0 ≥ 7.4 and ≤ 9.5
7 4.0 ≤ 12.7
8 5.0 ≤ 15.8
9 6.0 ≤ 19.0
10 0 0
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