CSAT3B Three-Dimensional Sonic Anemometer
61
If monitoring shows the internal humidity of the CSAT3B rising above 50%,
including during night time cooling cycles, the desiccant should be replaced
with canisters that can be purchased from Campbell Scientific. The small
canister holds desiccant and is installed on the underside of the anemometer
block inside of the brass screw cap (see FIGURE
). Use a large flat-headed
screwdriver to unscrew the cap and remove the canister. Replace the old
canister with an unused one.
The new canister should appear blue in color. A pink-hued canister indicates
that moisture has been absorbed, and the canister should be discarded and
replaced with a new one. When replacing the brass screw cap, ensure the cap is
tightened until the head of the screw is flush with the housing and the o-ring
cannot be seen.
Replacement desiccant canisters are shipped in a vacuum-sealed
bag. The bag should not be opened until the canisters are to be
inserted into the anemometer block.
Desiccants are shipped with an expiration date. The expiration
date reflects the date by which the desiccant should be properly
installed in the instrument.
FIGURE 9-2. Exploded view of CSAT3B desiccant canister
NOTE