Air Flow Sensor - Respironics ESPRIT Service Manual

Air Flow Sensor

REF 580-1000-02 G
From inspiration
module assembly
From exhalation filter
heater assembly
Exhalation autozero
solenoid (SOL3)
To exhalation pressure
transducer (U32) on sensor PCB
To inspiratory pressure
transducer (U33) on sensor PCB
Figure 9-76: Three-Station Solenoid Assembly
Follow these steps to remove the air flow sensor (Figure 9-77). Reverse
removal steps to install.
NOTE:
• The oxygen regulator assembly and air valve must be installed before
reinstalling the air flow sensor.
• When reinstalling the air flow sensor:
• Install a new mesh cup on the top port of the air valve.
• The circuit board must face away from the blower with the flow
arrow pointing toward the inspiratory manifold.
• To avoid damaging the flow sensor, hand-tighten replacement tie-
wraps (do not tighten the tie wrap with a tool).
1. Remove top enclosure (see "Top Enclosure" on page 9-4).
2. Remove enclosure brace.
3. Disconnect the transfer tube from blower outlet to the top port of the
air valve.
4. Disconnect the vent tube from the safety valve port, then fold the tube
away from air flow sensor.
Esprit® Ventilator Service Manual © Respironics, Inc.
Component Removal/Installation
Inspiratory autozero
solenoid (SOL4)
Safety valve
solenoid (SOL2)
To pressure relief valve
Chapter 9
9-65