Testing; Pressure Accuracy Test; Flow Accuracy Test - DeVilbiss IntelliPAP DV54 Service Manual

EN
5.
The following test procedures verify correct operation of the
DV54 PAP and should be performed on all repaired units.
NOTE– Verify that the DV54 PAP contains the latest fi rm-
ware release before conducting maintenance or
repairs. Go to http://www.devilbisshealthcare.com/
Products to download the latest fi rmware update.
Download and installation instructions are provided
on the web site.
A. PRESSURE ACCURACY TEST
Additional equipment required: outlet cap (DV51D-620), a
calibrated pressure gauge (0-30 cmH2O, accuracy ±0.25
cmH2O)
1. Connect the pressure gauge to the unit outlet port.
2. Apply AC power to the unit. If the blower is running,
press the ON/OFF key on the keypad so that the
blower stops and the LCD displays 'OFF'.
3. While pressing both the Down Arrow and Delay
keys, press the ON/OFF key to start the blower and
enter clinical mode.
4. Press the Next Item (right arrow) key to move to the
Operating Mode screen. Use the Up Arrow or Down
Arrow keys to place the unit in CPAP mode.
5. Press the Next Item key until Set Pressure is dis-
played. Use the Up and Down Arrow keys to adjust
the pressure to 12 cmH2O. Wait at least 30 seconds
for the pressure to stabilize.
6. Verify that the displayed pressure matches the pres-
sure measured on the gauge (pressure setting ±0.5
cmH2O). Accuracy at other pressure settings can be
checked if needed.
7. If the pressure is out of calibration, turn the blower
OFF for approximately 1 minute to allow auto-calibra-
tion to occur. Turn the blower back ON and allow 30
seconds for the pressure to stabilize. If the pressure is
still out of calibration, perform a full calibration using
the Manual Calibration Procedure.
8. If manual calibration does not improve pressure ac-
curacy, there may be a problem with the fl ow path or
control board. Refer to Troubleshooting.

Testing

B. FLOW ACCURACY TEST
Additional equipment required: PAP to PC cable (DV51D-
615), a calibrated volumetric mass fl ow meter (range 0 to150
L/Min, accuracy ± 3 L/Min), a fl ow control valve #DV51D-
621 (or equivalent) to adjust fl ow, and a terminal program
(Microsoft Windows HyperTerminal or equivalent).
1. Perform pressure accuracy test fi rst to ensure that
pressure is correct.
2. Connect the volumetric mass fl ow meter and fl ow
control valve to the unit outlet port and close the
valve.
3. Apply AC power to the unit and connect the unit to
the terminal program via the PAP to PC cable.
4. If the blower is running, press the ON/OFF key on
the keypad so that the blower stops and the LCD
displays 'OFF'.
5. While pressing both the Down Arrow and Delay
keys, press the ON/OFF key to start the blower and
enter clinical mode.
6. Press the Next Item (right arrow) key to move to the
Operating Mode screen. Use the Up Arrow or Down
Arrow keys to place the unit in CPAP mode.
7. Press the Next Item key until Set Pressure is dis-
played. Use the Up and Down Arrow keys to adjust
the pressure to 12 cmH2O. Wait at least 30 seconds
for the pressure to stabilize.
8. Adjust the fl ow control valve to achieve 60 lpm on
the fl ow meter. Wait at least 30 seconds for the fl ow
to stabilize.
9. Verify that the leak fl ow (terminal command: Fl)
matches the fl ow meter reading (set value ±10 lpm).
Accuracy at other fl ow settings can be checked if
needed.
10. If the fl ow is out of calibration, turn the blower OFF
for approximately 1 minute to allow auto-calibration
to occur. Turn the blower back ON and allow 30 sec-
onds for the pressure and fl ow to stabilize. If the fl ow
is still out of calibration, perform a full calibration using
the Manual Calibration Procedure.
11. If manual calibration does not improve fl ow accuracy,
there may be a problem with the fl ow path or con-
trol board. Refer to Troubleshooting.
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