Campbell Scientific CSAT3B CSAT3B Three-Dimensional Sonic Anemometer - Page 66

Desiccant

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CSAT3B Three-Dimensional Sonic Anemometer face by between one half and one mesh lines (FIGURE 9-1, right). Secure the wicks to the transducer with a drop of adhesive, such as super glue. Replacement top wicks (pn 17388) and bottom wicks (pn 17389) can be purchased from Campbell Scientific. A complete set of wicks for one CSAT3B consists of three top wicks and three bottom wicks. FIGURE 9-1. Proper orientation of sonic top wick (left) and bottom wick (right) 9.3 Desiccant To prevent liquid water from coming in contact with the CSAT3B electronics, the internal humidity must be maintained at non-condensing levels. The CSAT3B has an on-board relative humidity sensor that continuously monitors the humidity inside the enclosure. This humidity ranges between 0 and 100%. As temperature decreases, the capacity of air to hold water also decreases and the relative humidity will increase even if no additional water has been introduced into the closed system. As the relative humidity approaches 100%, condensation will begin to form on the internal surfaces. The CSAT3B has a cavity to hold a replaceable desiccant canister that removes water from the air (see FIGURE 9-2). Water molecules will unavoidably ingress into the electronics over time, so the internal humidity of the CSAT3B head should periodically be checked. This can be done automatically with a datalogger if the datalogger program uses the CSAT3BMonitor() instruction in CRBasic, or manually by connecting a CSAT3B to a PC using the USB cable and then launching the Device Configuration Utility. Under the Settings Editor tab of the utility, there is secondary tab for Real-Time Data, where the internal humidity measurement will be displayed along with various other measurements. 56

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CSAT3B Three-Dimensional Sonic Anemometer
face by between one half and one mesh lines (FIGURE 9-1, right).
Secure the
wicks to the transducer with a drop of adhesive, such as super glue.
Replacement top wicks (pn 17388) and bottom wicks (pn 17389) can be
purchased from Campbell Scientific.
A complete set of wicks for one
CSAT3B consists of three top wicks and three bottom wicks.
FIGURE 9-1.
Proper orientation of sonic top wick (left) and bottom wick
(right)
9.3
Desiccant
To prevent liquid water from coming in contact with the CSAT3B electronics,
the internal humidity must be maintained at non-condensing levels. The
CSAT3B has an on-board relative humidity sensor that continuously monitors
the humidity inside the enclosure. This humidity ranges between 0 and 100%.
As temperature decreases, the capacity of air to hold water also decreases and
the relative humidity will increase even if no additional water has been
introduced into the closed system. As the relative humidity approaches 100%,
condensation will begin to form on the internal surfaces.
The CSAT3B has a cavity to hold a replaceable desiccant canister that removes
water from the air (see FIGURE 9-2). Water molecules will unavoidably
ingress into the electronics over time, so the internal humidity of the CSAT3B
head should periodically be checked. This can be done automatically with a
datalogger if the datalogger program uses the
CSAT3BMonitor()
instruction
in
CRBasic
, or manually by connecting a CSAT3B to a PC using the USB
cable and then launching the
Device Configuration Utility
.
Under the
Settings
Editor
tab of the utility, there is secondary tab for
Real-Time Data
, where the
internal humidity measurement will be displayed along with various other
measurements.
56