4a Tests and Calibration 4.X Software
1006-0453-000 05/04
4a-17
4a.3.8 Test Flow Valve
To test the flow valve the software starts by closing the flow valve. It then
opens the flow valve in increments until the flow valve is completely open. At
each of the settings of the flow valve the A/D (Analog/Digital) channel for
Flow DAC (Digital to Analog Converter) Feedback and Flow Current Sense will
be read. If the A/D for the Flow DAC Feedback and Flow Current Sense are not
within the correct tolerance the test fails.
After setting the Bag/Vent switch to Vent, disengage the drive gas from the
breathing system by removing the bellows housing.
Figure 4-18 • Test Flow Valve menu
Flow Valve Test FAIL
instructions
A failure can be caused either by the drive circuit or a flow valve malfunction.
Go to the “Flow Valve Test Tool” menu to check the drive circuit for proper
voltage output.
Set the flow control to output 120 liters per minute. Unplug the connector
from the pneumatic connection board and measure the resistance between
the leads at the unplugged flow valve connector. A multimeter should read
approximately 1.75 ohms.
• If the resistance is approximately 1.75 ohms, the drive circuit is bad, replace
the CPU board (see section 7) and test the flow valve again.
• If the flow valve test fails again, replace the flow valve (see section 7).
Summary of Contents for Aestiva 7900 SmartVent
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