Self-tests
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
3-17
6
Flow sensor test
Autozeroes flow sensor. Delivers
set rate (20, 100, and 150 L/min
for adult tubing or 10, 40, and
80 L/min for pediatric tubing).
Verifies that exhaled volumes
are within ±10% of delivered
volumes.
1. Make sure room temperature is not too
low. Make sure ventilator has warmed up.
2. Make sure oxygen source pressure is
between 40 and 90 psi (275 and 620 kPa).
3. Using
Sensor data
function in service
menu, verify that flow sensor transducer
temperature (T
xdcr
) is between 45 and
55 °C. Verify correct tubing connections to
flow sensor.
4. Use
Review constants
function in service
menu to verify that flow sensor constant is
as stated on calibration label. Input correct
constant, as required.
7
Leak test
Pressurizes system to 50 cmH
2
O.
Ensures pressure has not
dropped below 40 cmH
2
O.
Monitors exhalation pressure
over 6-second period. Verifies
leak is <7 cmH
2
O (adult circuit)
or <9.5 cmH
2
O (pediatric circuit).
1. Verify tubing setup is correct, that all
tubing connections and wye block are
secure, and that tubing has no apparent
leaks.
2. Verify inspiratory and expiratory filters are
properly installed.
3. Verify safety valve is closed during this test.
4. Verify pressure sensing tubes are not
leaking.
5. Replace exhalation valve.
6. Replace elbow tube (between inspiration
manifold and ventilator outlet).
7. Replace cylinder outlet check valve.
P
e
P
cyl
compare
Reads cylinder and exhalation
pressure transducers. Verifies
readings are within 3.5 cmH
2
O
of each other.
1. Verify tubing connections between
exhalation and cylinder pressure
transducers and their pressure taps are
secure.
2. Perform P
e
P
cyl
gain equalization.
NOTE:
Do not perform the P
e
P
cyl
gain
equalization unless the leak test has
passed.
Auto zero solenoid
test
During pressurization, turns on
the P
cyl
solenoid (P
cyl
1) and reads
the pressure (0 cmH
2
O). If the
pressure is greater than
6 cmH
2
O, the test fails. It turns
the solenoid off and reads the
pressure again (P
cyl
2). The
absolute difference between P1
and P2 should be no greater
than 20 cmH
2
O or the test fails.
The P
e
test is identical to the one
above, except it is perfomed
after pressurization and during
leak measurement.
1. Verify the tubing connections between
exhalation and cylinder pressure
transducers and their pressure taps are
secure.
2. Replace autozero valve.
3. Replace pressure solenoid PCB if steps 1
and 2 do not resolve the problem.
Table 3-9: EST troubleshooting (continued)
EST
test no.
Test name
How the ventilator performs the
test
Corrective action
Summary of Contents for Puritan Bennett 700 Series
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