Dräger Narkomed 2B Operator's Instruction Manual page 147

Scavenger
Interface for
Passive Systems
Maintenance
4. The flowmeter has a small port, located on its underside, that is open
to the atmosphere. For the flowmeter to work properly, this port
must remain open. Remove the flowmeter from the block and inspect
this port. If it is blocked, clean it with compressed air.
5. Remove the reservoir canister from the scavenger body by
unscrewing the four socket head cap screws located at the top of the
canister.
6. Replace the cleaned needle valve assembly and reservoir canister.
Verify that all parts are completely dry before reassembly.
7. Perform the open reservoir scavenger portion of the daily checkout
procedure provided in "Daily Checkout."
The scavenger should be cleaned at least once every six months.
1. Clean the scavenger body with a moist cloth.
2. Inspect all scavenger hoses for deterioration. Replace any worn
hoses.
3. Remove the relief valve housing by unscrewing it counterclockwise.
4. Inspect the rubber o-ring. If it is worn, replace it.
5. Remove the relief valve by twisting it counterclockwise out of the
housing. You can use the tips of a needle-nose pliers to turn the
valve, but take care not to damage the relief valve's fragile valve
disk.
6. Brush any accumulated lint or dust off the valve with a soft brush.
The valve can be further cleaned with a low flow of clean air or
oxygen.
7. Reinstall the valve into the housing, making sure that it is threaded
all the way into the housing and that the plastic washer is properly
seated on its upper surface.
8. Verify that the interior of the valve body is completely dry. Reinstall
the valve housing onto the scavenger body, making sure that the
o-ring is properly seated.
9. Perform the scavenger interface for passive systems portion of the
daily checkout procedure provided in "Daily Checkout."
Routine Maintenance and Cleaning
Section 6
6-5