Campbell Scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer - Manual (Page 38)

EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
FIGURE 9-1. The underside of the optional heated intake
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.) To clean the windows,
follow these steps:
a. Stop the air flow through the EC155.
b. 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 9-2.
c. 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 9-3.
d. Lift the analyzer head off the sample cell (see FIGURE 9-4), taking care
not to lose the O-rings (pn 26212) surrounding the optical windows (see
FIGURE 9-5). 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.
e. Wash the windows with isopropyl alcohol using cotton swabs or a non-
scratching tissue or cloth.
f. Put the analyzer back in place, making sure the O-rings are still intact.
The analyzer’s label should face out to the side.
g. Rotate the latches back in place to hold the analyzer’s struts down, and
tighten the long thumbscrews by hand. Also make sure the analyzer cable
is seated properly in the cable clamp and tighten the thumbscrew by hand.
h. Put the top portion of the EC155 shell back in place, and tighten the
thumbscrews.
Santoprene Tab
28