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Field
Service
Procedure
Part Number: SP00092
Date: 9 April 2001
© 2001 Draeger Medical, Inc.
Rev: B
Kit,
Low Flow Flowmeters
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KIT, LOW FLOW FLOWMETERS
CONVERSION PROCEDURE
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NOTE: The flowmeter tubes are held by
compression in gaskets at the top and
bottom of each tube. Each upper gasket is
seated in an adjustable retainer that
allows removal of the tube. Access to the
flow tubes and their retainers requires
removal of the plexiglass cover on the gas
instrumentation panel. A typical flow tube
mounting arrangement is shown in Fig. 1.
1. Disconnect all pipeline hoses and
turn the System Power switch to
ON.
2. Close all cylinder valves except the
valve.
O
2
3. Set the oxygen flow to 5 l/min.
4. Open the other gas flow control
valves to drain pressure from the
system.
5. Close the O
cylinder valve, and
2
close the flow control valves. Press
the O
Flush valve to drain
2
pressure from the system.
6. Turn the System Power switch to
STANDBY.
7. For later machines with the
plexiglass cover over the gauges
and flow tubes, remove the screws
holding the table top to the
machine and lift out the table top.
8. Early models: Remove the
flowmeter housing rear cover.
9.A Early models: Remove the two
screws (from the back) holding the
front plate at the top of the
plexiglass cover. Hold the front
plate as the screws are removed
from the back.
9.B Later models (without the O
2/N2
O
ratio alarm lamp): Remove the six
screws holdingtheflowmetershield
and vapor box cover panel, and
remove the panel.
10. For earlier machines where the
plexiglass covers only the flow
tubes, skip to Step 12.
For later machines with the
plexiglass cover over the gauges
and flow tubes, remove the O
2
flow
control knob. The knob has two
setscrews.
NOTE:
If the knob must be rotated to allow
access to a setscrew, carefully note
its position so that it can be reassembled in the same position
with the "Off Stop" properly set.
11. Remove the two screws holding the
knob guard in place, and remove
the knob guard.
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CONVERSION PROCEDURE (continued)
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12. Remove the screws holding the
plexiglass cover, and carefully
remove the cover.
13. Loosen the screw directly above the
flowmeter tube to be replaced.
Turning the screw counter
clockwise will raise the upper flow
tube retainer.
Raise the retainer far enough to be
able to pull the top of the tube
outward, and remove the tube.
NOTE:
If the bottom of the tube is seated
in a flow restrictor, be sure that the
arrangement of the restrictor and
its gaskets is not disturbed.
FLOW TUBE
RETAINER SC REW
UPPER FLOW
TUBE RETAINER
GASKET
FLOW TUBE
LIGHTING CHANNEL
FLOW
RESTRICTOR
SV40605
GUIDE RING
Figure 1: FLOWMETERS
2
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CONVERSION PROCEDURE (continued)
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14. Since the replacement flow tubes are
labeled but do not have a color
designation, attach an appropriate
label to the top and bottom of the
coarse (0.6 - 10 L/min.) flow tube. Be
sure not to cover the flow
measurement labeling. The flow tube
designated "O2" will have a green O2
label affixed; the flow tube
designated "N2O" will have a blue
N2O label affixed. Make sure that
each flow tube has an indicator ball.
Note: If the replacement N2O "fine" flow
tube appears to be too short, use the
supplied N2O restrictor housing and
gasket to fit the flow tube. Be sure to
transfer the original N2O restrictor
and bottom O-ring to the new
restrictor housing.
15. Place the bottom of the flowmeter
tube into the guide ring of the lower
gasket seal, and position the top of
the flow tube into the center guide
ring of the top gasket seal. It will be
easier to hold the tube if the adjacent
lighting channel is pulled forward
and temporarily removed.
CAUTION:
The flowmeter tube must be properly
centered over the guide rings or
damage to the flowmeter tube may
occur.
16. Ensure that the markings on the flow
tube are facing forward, and turn the
upper retainer screw clockwise until
the flow tube is firmly held in place.
CAUTION:
Do not over-tighten the screw as the
flowmeter tube may break.
17. Repeat Steps 13 thru 16 for the other
three flow tubes.
18. Perform the following leak test on the
system:
a. Disconnect the absorber hose from
the freshgas outlet.
b. Connect a test gauge and B.P. bulb to
the freshgas outlet, and pressurize
the system to 50 cm H
O.
2
c. The pressure should not drop more
than 10 cm H
O in thirty seconds.
2
19. Disconnect the test gauge and reconnect the absorber hose to the
freshgas outlet.
20. Replace any lighting channels that
were previously removed.
21. Set the front plexiglass cover in
place, and reinstall the cover screws.
Do not over-tighten these screws as
the plexiglass may crack.
22. If applicable, reinstall the knob
guard.
23. If applicable, reinstall the O
2
flow
control knob and tighten its
setscrews. If the knob is installed
properly, the O
label will be straight
2
when the knob is against its
clockwise stop.
24. Replace the front cover plate at the
top of the plexiglass cover and secure
it with the hardware that was
previously removed.
25. If applicable, reinstall the flowmeter
housing rear cover.
26. If applicable, reinstall the table top
and its retaining screws.
27. Connect the pipeline hoses.
28. Perform a complete PMS procedure
on the machine.
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DrägerService
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®
DrägerService is a division of
Draeger Medical, Inc.
3122 Commerce Drive
Telford, PA 18969
Tel: (215) 721-5402
(800) 543-5047
Fax: (215) 721-5784
Web: www.draegermedical.com
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