4a Tests and Calibration 4.X Software
4a-32
05/04 1006-0453-000
3. Adjust the APL to read 20 cm H
2
O on the gauge. The flows may jump briefly,
but should stabilize to read b0.5 and -0.5 LPM.
4. Adjust the APL to read 40 cm H
2
O on the gauge. The flows may jump briefly,
but should stabilize to read b0.5 and -0.5 LPM.
5. If the flow measurements on the ADC page stay near zero, the flow sensors
are good. If either sensor indicates a flow where there is none, there may be
a leak. To troubleshoot, reduce the circuit pressure back to zero. Reverse
the flow sensor connections at the SIB interface panel and repeat the
above tests.
6. If the problem follows the sensor, discard the sensor. It has a leak.
7. If the problem stays with the same side of the circuit, it is likely the leak is
in the tubing, not with the sensor.
4a.3.22 Calibrate Flow
Valve
The software prompts the user to perform the procedural steps to calibrate
the flow valve. This is an automated calibration. It gradually opens the flow
valve and monitors the manifold pressure. When the manifold pressure
reaches 1.9 to 2.0 cm H
2
O the value at which the flow valve has been opened
is saved. The flow valve is then closed. The value at which the flow valve was
opened to is then checked to make sure it is within the correct tolerance. If it is
not, the calibration fails. If the calibration passes, the flow valve calibration
point is stored in the EEPROM.
Figure 4-34 • Calibrate Flow Valve menu
Remarks
Check that the Bag/Vent selection switch is in the vent position. If the flow
valve calibration test fails immediately, the most likely fault is a failed
manifold transducer. It can also be a failed regulator or the regulator could
need calibration. Another cause could be a failed flow valve.
Summary of Contents for Aestiva 7900 SmartVent
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