14‐14MaintenanceandTroubleshooting ExpressionMR400InstructionsforUse
ToreplacetheO
2sensor.
Step Action
1TurnofftheMR400.
2Ensurethatanygassamplinglinehasbeendisconnectedfromthe
watertraponthepatientconnectionpanel.
3 Removethetwoscrewsthatsecuretheservicepanelcovertothe
backoftheWPUandthenremovetheservicepanelcover.
4Locatethesensortooland
theO2sensorport.
5PlacethesensortoolintotheslotintheO2sensor,thenturnthe
sensorcounterclockwiseuntilitdisengagesfromthesensorport.
Screws
Service panel
cover