Teledyne IR-7000 - Non-dispersive infrared series - Manual (Page 65)

NDIR Gas Analyzer Maintenance 6
Teledyne Analytical Instruments., - Rev. 3 57
• 2 O-Rings
• Pressure Plate, Source
• Sample Cell End, Source Side
• Source Seal
• 2 O-Rings
6. Remove the PVC tubing connected to the sample cell. The
tubing is secured to the sample cell with plastic ties. Carefully cut
the ties using diagonal cutters. PUSH the end of each piece of
tubing off the fitting to disconnect the tubing.
CAUTION: Do not pull the tubing off the connectors. This could damage
the sample cell or break the feed connector on the plastic
coupler.
7. Disconnect the four cables that connect to the Optical Bench
Assembly. Note the location of the connectors before
disconnecting them.
• Gray Cable – connects between the detector and the main
board at J10. On instruments with dual benches, note which
main board is involved.
• Gray Cable – connects between the IR Source and the
main board at J2. On instruments with dual benches, note
which main board is involved.
• Twisted Pair Cable – There are 2 twisted pair cables
connecting between the optical bench mounting plate and
the main board. Disconnect the cables from the power
supply board at J6 and J7. On instruments with dual
benches, note which main board is involved.
8. Remove the 4 nuts and washers that secure the optical bench
mounting plate to the case.
9. Remove the Optical Bench Assembly from the instrument.
CAUTION: Do not lift the assembly out by the sample cell! Lift the
assembly out by grasping the source holder and the detector.
Use care to avoid snagging the loose wires on any other
component when lifting the assembly out of the case.
10. Loosen the 4 screws in the brown coupling between the
detector and the sample cell but do not remove.
NOTE: If the instrument is designed for high percentage analysis and no gold
colored Sample cell is visible, then remove the 4 screws.