Teledyne 7500ZA - Infrared Gas Analyzer - Manual (Page 94)

Maintenance Model 7500ZA
Teledyne Analytical Instruments 78
7.4 Cleaning the Sample Cell
Entry of dust or water in the sampling cell contaminates the interior
of the cell resulting in drift. If dirty or contaminated, it must be cleaned.
Check the sampling device, especially the filter, to prevent the cell from
being dust or mist contamination.
Caution: Maintenance should be performed only by
properly trained and qualified personnel.
In addition to the following steps, the user must
adhere to any local and regional regulations.
7.4.1 Sample Cell Disassembly
There are two kinds of sampling cells used in the Model 7500ZA:,
block cells (cell length: 4 mm, 8 mm, 16 mm, 32 mm) and pipe cells
(cell length: 64 mm, 125 mm, 200 mm and 250 mm).
A two-component analyzer may incorporate both sampling cells in
one optical unit. In this case, detach the pipe cell and then block cell (see
Fig. 7-3).