Dräger Narkomed 2B Operator's Instruction Manual page 162

Section 6
Routine Maintenance and Cleaning
6-20
4. Replace the pressure gauge. Place the pressure gauge assembly
on the gauge mount, making sure that the o-ring is in place
between the pressure gauge assembly and the gauge mount. Slide
the knurled ring nut over the threads on the gauge mount. Turn
the knurled ring nut clockwise until it is secure. Check the gauge
needle's zero position and adjust it if necessary.
5. Replace the respiratory volume sensor. Place the sensor on the
absorber dome (ensure that the gasket is in place.) Turn the ring
nut clockwise until the sensor is secure. Reconnect the sensor
cord to the system interface panel.
6. Replace the canisters and dust cup, making sure the gaskets and
o-ring are in place. Pull the canister lever up until it clicks in
place.
7. Reassemble the inspiratory and expiratory valves. Place the valve
disk and dome gasket in the valve body, then replace the dome
and ring nut. Turn the ring nut clockwise to tighten.
8. Replace the inspiratory valve assembly and gasket on the valve
mount. Turn the valve assembly clockwise to secure it to the
valve mount.
9. Replace the expiratory valve assembly and gasket on the
respiratory volume sensor. Turn the valve assembly clockwise to
secure it to the sensor.
10. Replace the oxygen sensor in the inspiratory valve port. Connect
the sensor cord to the system interface panel.
11. Connect the fresh gas hose to the fresh gas outlet on the machine.
WARNING: Do not pinch or kink the fresh gas hose leading
12. Reconnect the breathing pressure pilot line to the absorber and
the system interface panel.
13. Replace the 22 mm hoses and other breathing circuit accessories.
14. Replace the 19 mm hose that connects the APL valve to the
absorber pole.
form the fresh gas outlet to the absorber.