LI-COR LI-8150 Multiplexer Instructions

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.
Turn the instrument power off and remove the power
1.
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.
Pull the tubing out of the two orange quick connect
3.
fittings attached to the pump (Figure 2). Pull the pump
straight up and out of the mounting bracket.
Loosen the 2 thumbscrews and remove the access
4.
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.
Remove the 2 screws from the pump mounting
5.
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
9981-174 Diaphragm Pump Upgrade Kit Instructions
IMPORTANT NOTE: LI-COR
has replaced the rotary vane
pump in the LI-8150 with a
1
Loosen the 2
thumb screws, and
remove the display
panel. Unplug the
ribbon cable and
set the display
panel aside.
Access panel.
2
Quick connect
fittings on old
pump.
Pump mounting
bracket.
Pull these 2
pieces of tubing
out of the pump
connectors.
3
Unplug the old
wiring harness
from the Pump
connector
beneath the
access panel.
4
Remove the 2
screws from the
old pump
mounting
bracket. Discard
screws and
mounting
bracket.
Remove these 2
short pieces of
tubing by pulling
straight out.