5400 LiCor Cleaning Procedure

Purpose:  Follow the steps below to clean the CO2 LiCor sensor on the 5400 instrument.

Required Equipment:  Adjustable wrench

                                          Screwdriver set

                                          LiCor cleaning kit

                                          50/50 mix of ethanol and water solution

Reference:  SOPMAN

1. Shutdown the 5400 and turn it off.

2. Pull out the bulkhead so that you can reach the LiCor sensor.  It is sitting on top of the pinch valve assembly and has a sheet metal cover over the top of it and pink foam insulating the sensor.

3. Unclamp and pull off both pieces of black tubing attached to the LiCor.

4. Unscrew the LiCor housing cover.

5. Disconnect the ribbon cable on each end of the sensor.  Pay careful attention to where the cables were disconnected.

6. Take the sensor out of the foam insulating casing.  Make note which housing is on the right and which is on the left.

7. Make a clean working area on a counter top to prepare for disassemble and cleaning.

8.  Remove the four screws on the source and detector circuit boards.  The four at the corners of the boards that is slightly larger than the other four screws.  Do not remove the four remaining smaller screws.

9. Now that you have the tube separated from the source and detector housings; inspect the O-rings for damage.  It is good practice to replace the O-rings if available when cleaning or replacing the optical bench. 

10. You will have two sizes of swabs in the LiCor kit.  Take the larger of the two (Optical Path Swab) and clean the bench tube with the cleaning solution.

11. Wet the smaller swab (Reflector Swab) with the cleaning solution and clean the gold plated concave housing.

12. Let the optical bench dry.

13. Before continuing check the bench for apparent haze, clean again if needed.

14. Reassemble, making sure the O-rings are clean and in place on both ends of the bench.  The orientation of the cylinder is not important; either end can be inserted into the source and detector housing.

15. Return the insulating foam, ribbon cables, and tubing back on and screw the cover piece back in place.

16. Turn the 5400 back on and do a complete LiCor Calibration.

17. Put the 5400 into Run mode once the sensor has proven to be operating correctly.