Mixer Test; Mixer Outlet Check Valve Leak Test; Mixer Flow Verification - GE Datex-Ohmeda Aisys Carestation Reference Manual

Aisys

6.6 Mixer test

6.6.2 Mixer flow
verification
Note
6-10
To perform the mixer tests, you must gain access to the mixer outlet tubing which is
connected to the inlet of the electronic vaporizer.
1. To access the electronic vaporizer, refer to Section 9.7
2. Disconnect the mixer outlet tube at the inlet to the electronic vaporizer.

6.6.1 Mixer outlet check valve leak test

To test the mixer outlet check valve you must apply back pressure to the check valve
through the mixer outlet tubing and time the leak down rate of the pressure.
1. Tee in a pressure gauge and a syringe to the mixer outlet tube.
2. Slowly pressurize the mixer outlet check valve to 200 mmHg.
3. The pressure shown on the test gauge should not decrease by more than 10 mmHg
in 30 seconds.
To perform the flow verification test, you must attach a flowmeter to the mixer outlet
tubing and access the Gas Delivery Schematic (Section 12.3.2) on the Service
Application.
1. Connect a flowmeter to the mixer outlet tubing.
2. If the system includes an N
input of the electronic vaporizer or to the scavenging system.
Note: Some flowmeter test devices are not backpressure compensated. Connecting
the output of the flowmeter test device to the input of the electronic vaporizer can
cause readings outside limits.
3. On the Gas Delivery Schematic, establish the following flows and verify the readings
on the test flowmeter.
Set Flow
100% O at 10 l/min
2
100% Air at 10 l/min
100% N O at 10 l/min
2
100% N O at 0.5 l/min
2
100% Air at 0.5 l/min
100% O at 0.5 l/min
2
If you will be testing the Auxiliary O
the Alternate O "Flow Accuracy Test" at this point without reassembling the machine.
2
4. Remove the test device.
5. Connect the mixer outlet tubing to the electronic vaporizer.
6. Reassemble the machine.
10.Perform the Preoperative Checkout Procedure
(refer to the User's Reference manual).
O supply, connect the output of the flowmeter to the
2
Verify Flowmeter Reading
Lower Limit
l/min
9.0
9.0
9.0
0.45
0.45
0.45
flowmeter (TRM - Section 6.7), you can proceed to
2
Upper Limit
l/min
11.0
11.0
11.0
0.55
0.55
0.55
04/08 M1046983