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LI-COR LAI-2050 Replacement Instructions

Log switch assembly for the lai-2000 plant canopy analyzer

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LAI-2050 Log Switch Assembly
Replacement Instructions for the LAI-2000 Plant Canopy Analyzer
The following document describes the procedure for
replacing the log switch assembly on the LAI-2000
optical sensor head (p/n 2000-906). Please note that
the replacement kit does not include some required
adhesives; you can search for local suppliers and/or
order adhesives at the web addresses shown below.
Note, too, that the optical sensor head is a static-
sensitive device, and precautions (e.g. a static wrist
strap) should be taken before beginning this proce-
dure.
Tools Required:
3/32" hex wrench
1/4" open end wrench
Needle nose and lock-joint pliers
Flat blade screwdriver
Adhesives, including Loctite 242 Threadlocker and
Loctite PRISM 401 (www.loctite.com), and Dow
Corning 732 Multi-purpose sealant
(www.dowcorning.com)
Time Required: Approximately 30 minutes
Follow these steps to replace the log switch as-
sembly:
1. Use the 3/32" hex wrench to loosen the 4 hex
head screws at the connection between the
handle and the optical sensor (Figure 1). You will
need to pivot the sensor head to access the
screws.
2. Use a pair of needle nose pliers to gently pull out
the detector connector from the circuit board
(Figure 2).
3. Use the 3/32" hex wrench to remove the 4 hex
head screws at the opposite end of the handle,
where it attaches to the cable assembly (Figure 3).
Slide the circuit board out until you can unplug
the cable assembly by pulling the connector
straight out from the circuit board. Continue to
slide the circuit board out until you can access the
4-pin (white) log button/grounding connector
(Figure 4). Unplug the 4-pin connector, and slide
the circuit board back into the handle.
1
Loosen the 4 hex
head screws; you
will need to pivot
the optical sensor
head to access all
of the screws.
2
Unplug the
detector connector
by pulling straight
out.
3
Remove the 4 hex
head screws at
the handle/cable
assembly.
4
Slide the circuit
board out until you
can unplug the
white 4-pin
connector, and
then slide the
board back into the
handle.

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Summary of Contents for LI-COR LAI-2050

  • Page 1 LAI-2050 Log Switch Assembly Replacement Instructions for the LAI-2000 Plant Canopy Analyzer The following document describes the procedure for replacing the log switch assembly on the LAI-2000 optical sensor head (p/n 2000-906). Please note that Loosen the 4 hex the replacement kit does not include some required head screws;...
  • Page 2 4. Slide the circuit board out the end of the handle, nearest the optical sensor end (Figure 5). Use the flat blade screwdriver to pry up the log button cap Slide the circuit board out of the (Figure 6). Use your fingers, or a pair of pliers to handle, at the end unscrew the log switch collar;...
  • Page 3 Reassembly 1. Apply a small bead of Loctite 242 to the threads of the new switch. Make sure the Loctite is only on the threads of the switch; clean any excess from Hold the handle the log button if present to prevent it from sticking. upside down so the log switch can fall into place.
  • Page 4 Apply a small drop of Loctite 401 to the top of the switch and install the log button cap. Note orientation of sensor head and handle. LI-COR, inc. ● Environmental ● 4421 Superior Street ● P.O. Box 4425 ● Lincoln, Nebraska 68504 USA ®...