Datex-Ohmeda Aestiva 7900 SmartVent, Technical Reference Manual

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6 Maintenance
6-6 05/04 1006-0453-000
6.4 MOPV pressure relief valve test
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WARNING Objects in the breathing system can stop gas flow to the patient. This can
cause injury or death:
• Do not use a test plug that is small enough to fall into the breathing
system.
• Make sure that there are no test plugs or other objects caught in the
breathing system.
N N N Nooo otttteeee:::: For this test, the breathing system must be taken apart and the
exhalation valve removed. This test involves plugging the 2 silicone ports
beneath the exhalation valve (drive gas and exhalation valve ports). The drive
gas port, which is the one offset from center, has to be plugged below the take
off port for the drive pressure limit switch.
1. Using the standpipe tube from the exhalation valve, and with the u-cup seal
side of the tube up, push the standpipe tube down the silicone drive gas
port until it is approximately 1/2 inch (15mm) from the blue seal. Pushing
the standpipe tube all the way down to the seal may cause the test to fail.
Figure 6-5 • Occluding the standpipe tube
2. Plug the other silicone port (exhalation valve manifold pressure) with a test
plug.
3. Set the system switch to On and enter the Service Mode.
4. Select “Flow Valve Test Tool” from the menu.
5. Select and activate a flow of 20 LPM.
Plug (Manifold Pressure) Standpipe (Drive Pressure)
Occlude
with
finger