Campbell CSAT3B, Инструкция по эксплуатации, Страница: 24 / 88

CSAT3B Three-Dimensional Sonic Anemometer
5.2.3.5 Thermocouple Cover Backplate
The thermocouple cover backplate (pn 31423) attaches to the CSAT3B block
and is used to cover the back side of the thermocouple (TC) cover.
The backplate is required for the CSAT3B but not for other
Campbell sonic anemometers. In the case of previous models, the
back side of the TC cover is covered by the sensor block.
5.2.3.6 FW/ENC Thermocouple Enclosure
The FW/ENC is a small case (FIGURE 5-7) that is used for storing up to four
fine-wire thermocouples. Due to the fragile nature of the FW05 thermocouple,
it should always be stored in an FW/ENC when not in use. It is also
recommended to order, at a minimum, a set of four FW05 thermocouples for
every CSAT3B as the FW05 will break during normal wear and tear in the
field.
FIGURE 5-7. FW/ENC for storing fragile thermocouples
5.2.4 Other Accessories
The other accessories available for the CSAT3B are used when combining
multiple CSAT3B units into a network of sensors, the data from which are
collected by a single datalogger. Networks of CSAT3Bs using SDM or CPI
communications may be configured in three different configurations:
• In a series, using a daisy-chain topology
•
In parallel, using a star topology, or
• In a combination of daisy-chain and star topology
When designing an SDM or CPI network, careful attention should be given not
to exceed a total network cable length that will excessively attenuate the sensor
signals. The exact total length will depend on factors such as sample rate and
topology, but in general the maximum cable lengths (given in Section 6.2,
Communications ) for each communication type and data rate should be
followed.
Because CPI communications can support longer network cable lengths, it is
generally recommended as the communication method for sensor networks.
For more detailed information on network topologies and limits on cable
lengths for CPI networks, see the white paper titled Designing Physical
Network Layouts for the CPI Bus
, available at
www.campbellsci.com
.
NOTE
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