Mindray WATO EX-55Pro, Service Manual

Page: 109 / 474

4-9
4.7.2 Checking Needle Valve Correspondence
Perform the following operations in the BFCS state:
Turn the O2 needle valve and verify that the flow on the total flowmeter continuously increases
from about 1 L/min to about 10 L/min. Turn off the O2 needle valve. The flow should decrease to
about 1 L/min (that is, only the basal flow is reserved).
4.7.3 Checking the Needle Valve Sensitive Switch
Press the emergency button. After the BFCS is deployed, click Disable
Backup Flow Control
or
press the emergency button again. A prompt message "
Close manual valves prior to disabling
Backup Flow Control
" is displayed. The prompt message disappears and the BFCS can be
normally disabled.
4.7.4 Basal Flow Test in the BFCS State
1. Connect the O2 pipeline supply or open the backup O2 cylinder.
2. Press the emergency button to deploy the BFCS.
3. Verify that the float of the total flowmeter is in the vicinity of 1 L/min.
The following operations are optional:
1. Set the system to work in ACGO mode.
2. Connect the pipeline from the ACGO to the inlet of the flow test equipment.
3. Verify that the basal O2 flow is 1±0.25 L/min.
NOTE

The gas to be tested must be O2 and the O2 needle valve must be turned off.
4.8 Flow Control System Tests
4.8.1 Without O2 Sensor
NOTE

Turn the flow controls slowly. Do not turn further when the flowmeter indicates
the maximum or minimum flow to avoid damaging the control valve.
WARNING

If N2O is available and flows through the system during this test, use a safe and
approved procedure to collect and remove it.

Incorrect gas mixtures can cause patient injury. If the O2-N2O Link system does
not supply O2 and N2O in the correct proportions, do not use the system.
To do the flow control system tests:
1. Connect the pipeline supplies or slowly open the cylinder valves.
2. Turn all flow controls fully clockwise (minimum flow).
3. Set the system switch to the position.
4. Connect the AC power source if battery capacity shortage occurs. Do not use the system
if other ventilator failure alarm occurs.