EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
26
7.2.4 Unprompted Output Rate
This setting determines the output rate for unprompted output (USB or RS-485,
(p. 32)
). If the unprompted output is
disabled, this parameter is not used. The factory default output rate is 10 Hz,
but it may be set to 10, 20, or 60 Hz.
7.2.5 RS-485 Baud Rate
If the unprompted output mode is set to RS-485, this parameter determines the
baud rate. Otherwise this setting is not used. The RS-485 baud rate defaults to
115200 bps, although the user may enter another value.
7.2.6 Analog Output
The EC100 has two analog outputs for CO
2
and H
2
O molar mixing ratios (see
(p. 34)
, for more information). These outputs may
be enabled or disabled with this setting. The default is for analog output to be
disabled.
7.2.7
ECMon
Update Rate
This setting determines the rate at which data are sent over the USB connection
to the PC while running
ECMon
. The default setting of 10 Hz should be
adequate in most situations.
7.2.8 Sonic Transducer Shadow Correction
The CSAT3, CSAT3A, and CSAT3B suffer minimal wind distortion compared
to many other sonic anemometer designs thanks to the very low ratio of
transducer diameter to sonic path length and since the non-orthogonal
geometry keeps the sonic paths at angles closer to perpendicular with respect to
a mean horizontal wind flow. However, there are cases, such as when
oncoming wind has high angles of attach (for example, low frequency eddies at
on a tall tower), that will lead to more shadowing. Accordingly, an
optional
wind shadow correction specific to the CSAT3-series transducer diameter and
sonic path length has been implemented in EC100 OS versions 6.0 and newer.
For this setting to be viewed and enabled,
ECMon
version 1.6 or
newer or
Device Configuration Utility
version 2.12 or newer must
be used.
This shadow correction, known as the Kaimal correction (Kaimal, 1979
Horst et al, 2015
), is applied according to:
𝑈𝑈
𝑖𝑖
𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚
=
𝑈𝑈
𝑖𝑖
�
0.84 + 0.16
𝑠𝑠𝑠𝑠𝑠𝑠
(
𝜃𝜃
𝑖𝑖
)
�
i
Kaimal, J.C. (1979) Sonic anemometer measurement of atmospheric turbulence. Proceeding of
the Dynamic Flow Conference, Skovlunde. DISA Electronic A/S, pp 551 – 565.
ii
Horst, (2015) Correction of a Non-orthogonal, Three-Component Sonic Anemometer for Flow
Distortion by Transducer Shadowing.
Boundary-Layer Meteorol
155
: 371 – 395. DOI
10.1007/s10546-015-0010-3.
NOTE
Содержание EC155
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