Teledyne IR-7000 - Non-dispersive infrared series - Manual (Page 64)

Maintenance 6 IR7000
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Teledyne Analytical Instruments., - Rev. 3
5. Identify the parts and location of the Optical Bench Assembly.
See Figure 6-2.
• Sample Cell – This is a glass tube internally coated with
gold or silver. It is installed in a front-to-back orientation in
the analyzer. Instruments designed to measure trace levels
use a longer sample cell which is oriented diagonally
within the case. Instruments designed to measure high
percentage levels employ a much smaller cell that directly
connects the IR source and detector.
Figure 6-2: Optical Bench Components
• Source Holder –The source holder is the black mounting
block on one end of the sample cell.
• IR Source – The IR source is the silver metal cylinder
inserted into the source holder.
• Detector – The detector is the square block at the other end
of the sample cell. It normally carries a label reading
“Detector #XXXX” Where XXXX refers to the particular
detector for that instrument only. The detector cannot be
interchanged with other instrument.
• Optical Bench Mounting Plate – The long metal plate
running under the sample cell, detector and source holder is
the optical mounting plate. It is used to secure the optical
bench components in proper alignment.
• Couplers on Sample Cell – There are 5 plastic parts and 4
O-rings that are used to couple the cell to the detector and
source. From the detector end of the cell to the source they
are:
• Sample Cell End, Detector Side
• Pressure Plate