2 intake filter replacement, Intake filter replacement – Campbell Scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer User Manual

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EC155 CO

and H

O Closed-Path Gas Analyzer

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

9.2 Intake Filter Replacement

This section only applies if your EC155 was ordered with the intake assembly.

The differential pressure between the sample cell and ambient pressure should

be monitored in the output data. (This can also be done using the display

screen of ECMon). If the differential pressure approaches the limit of the full

scale range (-7 kPa), it is likely that the intake filter is clogged and should be

replaced. To replace the filter, follow these steps:

a. Stop the air flow through the EC155.
b. Locate one of the EC155 intake filters (pn 26072) in the mesh pocket of

the EC100 enclosure.

c. Remove the old filter by pulling on the small santoprene tab on the edge of

the filter (see FIGURE 9-1). Once removed, make sure the underlying

aluminum disk and intake hole are free from debris.

d. Place a new filter on the aluminum disk. Press along the santoprene edge

to make sure it is well-seated.

The standard intake filter has a sintered disk with 20 micron pore

size. For dusty sites, an intake filter with 40 micron pores may be

ordered (PN28698), which will increase the lifetime of the filter.

Ideally, the appropriate pore size will result in the filter needing

replacement at the same time the windows need cleaning (see

Section 9.3). For extremely dusty conditions, lowering the flow

rate through the analyzer will further increase the lifetime of the

filter, although this will also result in a decrease in frequency

response.

NOTE