6. To replace sensor housing plug assembly, disconnect it from the sensor cable, and use a 7/16” open
wrench to unscrew it from the housing, then disconnect its other electrical connector. In addition to taking
static sensitive precautions, take care not to touch the sensor portion of the assembly with your ngers to
avoid contaminating it. After you replace the plug assembly, perform the Pre-use Checkout.
5.14.3.2 Sensor Housing Repairs: Calibration Valve
1. Slide drawer to one side and remove three M4 screws that secure bottom cover to chassis.
2. Remove the humidier reservoir by pulling forward from bottom. A sheet metal ground strap is located
behind the reservoir. Remove the M3 screw that secures the strap to the bottom cover. Slide drawer to
other side and remove remaining three M4 screws that secure bottom cover to chassis. Remove the cover
by sliding out toward the right side of the unit.
3. Disconnect the ground cable from bottom cover. The ground cable is secured to a 4mm stud in the bottom
cover with a nut and two internal tooth lock washers.
4. Disconnect the cooling fan cable.
5. Use a 2.5 mm hex key to remove the M3 screw that secures the center of the sensor housing to the chassis.
Refer to “Figure 5-61 Sensor Housing”.
6. Use a 10mm nut driver to remove the two stand-o fasteners that secure the sensor housing to the
chassis.
7. Disconnect tubing from chassis and heat-sink vent ttings.
8. Disconnect all harnesses from sensor housing, and remove sensor housing from unit.
9. Remove the two M4 at head screws that secure the calibration valve to the sensor housing, and remove
calibration valve assembly.
10. Install new calibration valve assembly. Connect the black wire to the - terminal and the red to the +
terminal.
11. Perform the Pre-use Checkout and Leak Check.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved. 6600-0343-000 104 145
Chapter 5: Repair Procedures
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