EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
40
FIGURE 9-5. The underside of the intake of the older design sample
cell showing the inline filter with rain diverter in black
9.3 Cleaning Analyzer Windows
The windows of the analyzer should be cleaned if the signal strength of CO
2
or
H
2
O drops below 80% of the original value. (These values may be monitored
in the output data, or they can be viewed with
ECMon
.) Clean the windows
through the following steps.
1.
Stop the air flow through the EC155.
2.
Loosen the two captive thumbscrews (one on each end of the EC155), and
lift the top portion of the EC155 shell, leaning it back against the lower
shell. See FIGURE
3.
Loosen the thumbscrew on the cable clamp at the back of the analyzer to
release the cable, and loosen the two long thumbscrews found above the
sample cell. Rotate the latches so that the struts on the analyzer are free to
move upwards. See FIGURE
4.
Lift the analyzer head off the sample cell (see FIGURE
), taking care
not to lose the O-rings surrounding the optical windows (see FIGURE
). If an O-ring is lost, two replacement O-rings may be found in the
mesh pocket of the EC100 enclosure or new ones may be ordered.
5.
Wash the windows with isopropyl alcohol using cotton swabs or a non-
scratching tissue or cloth.
6.
In most cases, cleaning the sample cell will not be necessary. However, if
the inside of the sample cell is visibly dirty, it should be cleaned following
the instructions found in Appendix
(p. C-1)
.
7.
Put the analyzer back in place, making sure the O-rings are still intact. The
analyzer’s label should be facing out to the side.
Содержание EC155
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