Fresh Gas Flow Sensors And Filter Assembly - Dräger Medical Fabius Tiro Technical & Service Manual

Replacement Procedure
18 Fresh Gas Flow Sen-
sors and Filter
Assembly
Dräger Medical AG & Co. KGaA
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Access to the flow sensors and filter assembly requires access to the
Meter Bezel Assembly. Figure 24
assembly. For clarity, other sub-assemblies are not shown in the illustration.
NOTE
If the Core Unit is wall mounted, refer to the
Procedure prior to performing the following step.
NOTE
The safety valve, filter, and flow sensors can be serviced without com-
pletely removing the sub-assembly from the flow meter bezel assembly.
The illustration shows an exploded view to indicate connections that would
not otherwise be visible.
1. Disconnect all pipeline hoses and set the System Power switch to 'ON'.
2. Close all cylinder valves except the O2 valve.
3. Set the oxygen flow to 5 l/min.
4. Open the other gas flow control valves to deplete the pressure from the
system.
5. Close the O2 cylinder valve and close the flow control valves. Press the
O2 Flush valve to deplete oxygen pressure from the system.
6. Set the System Power switch to 'OFF' and disconnect AC power from the
machine.
7. Detach the cylinder supply from the yoke.
8. Loosen the screws securing the bezel assembly (refer to the
Bezel Assembly instructions) and bring the assembly forward for access
to the flow sensor sub-assembly.
9. Remove and retain the two top screws and two underside screws attach-
ing the Flow Sensor Housing Cover to the Flow Sensor Housing. Care-
fully remove the housing cover to gain access to the safety valve, filter,
and flow sensors.
10. The filter is accessible by un-screwing the safety valve from the manifold.
The flow sensors and manifold are held in place by a spring clip arrange-
ment. The SORC bypass valve is secured to the flow sensor bracket by
two screws and kep nuts as shown in the illustration.
11. Apply Loctite #425 (Blue) to the adapter fitting on the end of the flowsen-
sor, then install the replacement angle connector on the flowsensor hand
tight.
CAUTION
While securing the plastic hex located on the flowsensor, tighten the
angle connector to the flowsensor and align per original location.
12. Install the O-ring on the white manifold squarely by twisting the O-ring
side to side until it is fully seated against the shoulder. Do not allow the O-
ring to roll, it will not allow proper sealing once the flow valve is installed.
6020.002
shows the arrangement for this sub-
Wall Mount Service Access
Revision B Released
Fabius Tiro
Flow
Flow Meter
191