Teledyne 7600 - Infrared gas analyzer - operating manual - Manual (Page 94)

Maintenance Model 7600
Teledyne Analytical Instruments 94
Item to be
checked
Phenomena Cause Remedy
(2) Air is
absorbed
midway in the
sampling pipe. (2) Find cause
of leak and
repair.
Purge gas flow is
included when
purge gas in
sampling gas
flow rate. Standard flow is
beyond the specified
flow rate of 0.5 L/min,
0.3 to 0.7 L/min. Adjust using
needle valve
on flowmeter.
Zero point of gas
analyzer It is deflected. Adjust.
Span point of
gas analyzer It is deflected. Adjust.
4.3 Analyzer Maintenance
4.3.1 Sample Cell Cleaning
In rare circumstances will the sample cell require cleaning.
The procedure for dismantling and cleaning the sample cell
should be handled by qualified personnel only. In general,
if it is absolutely required, contact the factory.
The recommended procedure for cleaning the sample cell is as
follows:
1. Turn off the power switch, stop the sample gas, and
allow the zero gas to flow for several minutes to purge
the cell interior.
2. Loosen the setscrew (2 pieces) from the top cover and
remove it as shown in Figure 4-1.
3. Remove the internal gas inlet tube.
4. Loosen both right and left screws for cell holding plate
and remove only the sample cell. See Figure 4-2.
5. Turn the sample cell window to the left and remove it
from the sample cell. See Figures 4-3 and 4-4.