LI-COR LI-8150 Multiplexer User manual

IMPORTANT NOTE: LI-COR
has replaced the rotary vane
pump in the LI-8150 with a
more robust diaphragm pump. The
9981-174 Diaphragm Pump Upgrade Kit
can be field installed.
The only tools required to replace the rotary vane pump
are a Philips head screwdriver, 7/64” hex key (included),
and a knife. The upgrade takes about 15-20 minutes to
complete.
■Follow these steps to replace the rotary vane pump:
NOTE: Make sure that you are properly grounded to
avoid any electro-static discharge events that can
damage the internal components.
1. Turn the instrument power off and remove the power
cable.
2. Open the instrument case and remove the display
panel by loosening the 2 thumbscrews (Figure 1).
Unplug the ribbon cable attached to the display panel,
and set the panel aside.
3. Pull the tubing out of the two orange quick connect
fittings attached to the pump (Figure 2). Pull the pump
straight up and out of the mounting bracket.
4. Loosen the 2 thumbscrews and remove the access
panel (Figure 1). Unplug the wiring harness at the
PUMP connector (Figure 3), and pull the pump and
attached wire harness out of the instrument case.
NOTE: The wiring harness and connector might be
difficult to remove while the connector is attached; if
desired, you can cut the connector wires near the
PUMP connector (Figure 3), pull the connector off, and
then pull the wires out. Discard the pump and wiring
harness. If there was a filter attached to the old pump,
it can be discarded, too, as it is not needed with the
new diaphragm pump.
5. Remove the 2 screws from the pump mounting
bracket, and discard the old screws and mounting
bracket (Figure 4). Remove the 2 short pieces of tubing
shown in Figure 4 and discard.
LI-8150 Multiplexer
1
Loosen the 2
thumb screws, and
remove the display
panel. Unplug the
ribbon cable and
set the display
panel aside.
Quick connect
fittings on old
pump.
Remove the 2
screws from the
old pump
mounting
bracket. Discard
screws and
mounting
bracket.
Power
Active
Chamber
V3
V2
V4
SystemFailure
Active
Solenoid
ActivateAllChambers
9981-174 Diaphragm Pump Upgrade Kit Instructions
2
Pump mounting
bracket.
Unplug the old
wiring harness
from the Pump
connector
beneath the
access panel.
3
Access panel.
4
Remove these 2
short pieces of
tubing by pulling
straight out.
Pull these 2
pieces of tubing
out of the pump
connectors.

6. Locate the new wiring harness (p/n 9981-176). Route
the harness down through hole shown in Figure 5
(solenoids in photo removed for clarity); you can route
either end, as the connectors on both ends are the
same. Route the harness underneath the mounting
cage, and toward the access panel at the front of
instrument case. NOTE: Be careful not to use tools
that can damage the circuit board or other components
when routing the wire harness. Plug the connector
into the PUMP connector (Figure 5b). Replace the
access panel. Plug the other connector into the new
pump as shown in Figure 5c. Note the orientation of
the red and black wires on the two connectors.
7. Install the new pump adapter plate (p/n 9881-204) at
the location of the pump mounting bracket removed in
Step 5. Use 2 of the 140-04315 cap screws and the
7/64” hex key to install the adapter plate, as shown in
Figure 6.
8. Cut two 6” (15 cm) pieces of urethane tubing (p/n 222-
00303) from the length provided. Attach these two
pieces to the hose barbs shown in Figure 7 (you
removed two short lengths of tubing from these barbs
in Step 5).
Use 2 cap
screws to attach
the pump
adapter plate.
Plug the other
end of the wiring
harness onto the
connector on the
bottom of the
pump.
Attach two 6”
lengths of tubing
to these hose
barbs.
Route the wiring
harness down
through this hole
in the mounting
cage...
5a
...under the
mounting cage,
and onto the
circuit board
under the access
panel. Plug into
the Pump
connector.
b
6
7
Pump mounting
plate.
2
c

9. Place 2 of the 140-04315 cap screws down through
the pump mounting plate (Figure 5c) and align the
pump over the adapter plate installed in Step 7. Use
the 7/64” hex key to tighten the cap screws (Figure 8).
10. The diaphragm pump assembly comes with tubing and
quick connect fittings pre-installed. Note that there are
2 u-shaped tubing assemblies, one above the other, as
shown in Figure 8. These assemblies attach to the two
lengths of urethane tubing installed onto the hose
barbs in Step 8.
The bottom tubing and quick connect fitting assembly
from the pump attaches to the Exhaust manifold line,
as shown in Figure 9. Push in on the orange rings on
the quick connect fittings and slide the tubing into the
connectors. The top tubing and quick connect fitting
assembly from the pump attaches to the Inlet line, as
shown in Figure 10.
This completes the pump assembly.
11. Reinstall the ribbon cable onto the control panel, and
install the control panel.
Align the pump
mounting plates
and tighten the
two cap screws.
8
The bottom
tubing and fitting
assembly from
the pump
attaches to the
Exhaust manifold
line...
9
...whose t-fitting
leads to this
connector.
The top tubing
and fitting
assembly from
the pump
attaches to the
Inlet manifold
line...
10
...whose t-fitting
leads to this
connector.
3

LI-COR, inc. ●4647 Superior Street ●P.O. Box 4425 ●Lincoln, Nebraska 68504 USA
Phone: [phone] ● FAX: [phone]
Toll-free 1-800-447-3576 (U.S. & Canada)
[e-mail] ●[e-mail] ●www.licor.com ACU-120,
Rev. 1, 1/11
®