Teledyne IR-7000 - Non-dispersive infrared series User Manual

Page 66

Maintenance 6

IR7000

Teledyne Analytical Instruments., - Rev. 3

11. Remove the 2 screws from the underside of the Optical Bench

Mounting Plate that secure the IR source holder.

12. Separate the sample cell from the detector using a gentle

pulling and twisting motion. The cell is held in place with 2 O-
rings. Unless the coupling between the cell and detector is
dismantled, the O-rings should not pull out with the sample
cell.

During reassembly, make sure that the O-rings are not cut or
damaged as the cell is inserted. Make sure that the cell reseats
firmly within the O-rings.

NOTE:

If the instrument is designed for high percentage analysis and there is
no gold colored Sample cell visible, then skip this step and go to Step
# 14.

13. Loosen but do not remove the 4 screws securing the coupling

between the IR source and the sample cell.

14. Separate the sample cell from the IR source using a gentle

pulling and twisting motion. The cell is held in place with 2 O-
rings. The O-rings are held in pockets fabricated in the sample
cell pressure plate. They should not pull out when removing
the sample cell.

During reassembly, make sure that the O-rings are not cut or
damaged as the cell is inserted. Make sure that the cell reseats
firmly within the O-rings.

Reassemble the optical bench by the reversing the above steps.

During reassembly, make sure that both the sample cell and IR source are
fully seated in the connecting couplers.

WARNING: After servicing any part of the sample circuit, upon reassembly, a

leak check of the sample cell and tubing is required.

6.2.2 Cleaning the Sample Cell

WARNING: The sample cell is a glass tube (Metal Optional) which can be

broken if excessive force is applied to it. The fragments of a broken
sample cell are sharp and can cause serious injury. Use caution
when handling the cell.

1. Clean the Sample cell with soap and water followed by a final

rinse in de-ionized or distilled water.

2. Prepare a final rinse solution comprised of: