EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
35
9. Maintenance
There are five basic types of maintenance for the EC155/EC100: intake
cleaning and filter replacement (vortex bypass filter for newer EC155 sample
cells or inline filter for older EC155 sample cells), analyzer cleaning, zero and
spanning, replacing analyzer desiccant/scrubber bottles, and factory
recalibration.
9.1 Routine Maintenance
The following items should be examined periodically:
•
Check the humidity indicator card in the EC100 enclosure. If the
highest dot has turned pink, replace or recharge the desiccant bags.
Replacement desiccant bags may be purchased, or old ones may be
recharged by heating in an oven. See the manual ENC10/12,
ENC12/14, ENC14/16, ENC16/18, available at
, for more details on recharging desiccant bags.
•
Make sure the Power and Gas LED status lights on the EC100 panel
are green. If not, verify that all sensors are connected securely and that
the instruments are powered. Also check the individual diagnostic bits
for the specific fault. See TABLE
and TABLE
Usually, the CSAT3A sonic anemometer calibration remains valid unless a
transducer fails or damage to the instrument leads to a change in geometry. The
sonic anemometer requires calibration when:
•
It develops a wind offset greater than the specification
•
It sets diagnostic flags under dry conditions with little to no wind and
with no obstruction in the ultrasonic paths
The wind offset is tested by creating a zero-wind environment. This is best
done in a laboratory setting with HVAC vents closed or covered to reduce air
currents and by encircling the mounted sensor with a large plastic bag (for
example, an unused refuse bag). Use caution not to block the sonic paths. Once
the CSAT3A is connected to an EC100 and powered on, wind offsets may be
viewed by connecting the EC100 to a computer and using
ECMon
to graph u
x
,
u
y
, and u
z
(p. 28)
). In this zero-wind
environment, u
x
and u
y
should be less than ±
8 cm∙s
–1
(±
0.08 m∙s
–1
) and u
z
should be less than ±
4 cm∙s
–1
(±
0.04 m∙s
–1
). If recalibration is deemed
necessary, contact Campbell Scientific.
9.2 Intake Cleaning and Filter Replacement
This section has been divided into two parts, 9.2.1 and 9.2.2. Section 9.2.1
applies to the newer design EC155 sample cell with vortex intake. Section
9.2.2 applies to the older design EC155 sample cell without vortex intake
(sample cell serial numbers less than 2000).
9.2.1 Vortex Filter Replacement and Vortex Intake Cleaning
The vortex intake is able to separate particulates from the sample air as long as
there is adequate flow through the vortex’s bypass tube and filter. With a clean
bypass filter and a nominal total flow setting of 8 LPM, approximately 2 LPM
Содержание EC155
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