EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
27
Where:
U
i
= the magnitude of the wind vector parallel to the sonic path without
shadowing errors
i
= a placeholder index for
a
,
b
, or
c
, representing the three sonic paths,
and
θ
i
= the angle between the three-dimensional wind vector and the
a-, b-,
or c-
sonic path (see FIGURE
The EC100 embedded code improves the estimates of
θ
– and therefore the
accuracy of the correction – by iteratively applying the above correction three
times for each measurement of each sonic path. Since there continues to be
some debate on the appropriateness of this and other shadow corrections in
turbulent versus laminar flows, the default of this setting is
Disabled
.
FIGURE 7-1. Angle
θ
is defined as the angle between the three-
dimensional wind vector,
U
, and the vector component parallel to
the sonic path,
U
i
7.2.9 Temperature Sensor
The EC155 measures the temperature of the sample-cell block with a
thermistor (or thermocouple for older units) embedded in the block. With the
Auto-Select
default setting, the EC100 will automatically detect that an EC155
is connected to the electronics and will report temperature measurements from
the sample cell.
To diagnose problems with the temperature measurement, a fixed temperature
value may be used, or the temperature sensor may be selected manually.
7.2.10 Fixed Temperature Value
If the
Temperature Sensor
setting is
None
, the EC155 will use the value of
this setting for the sample-cell temperature. This mode is intended for
troubleshooting only. In normal operation, the
Temperature Sensor
is set to
Auto-Select
and this setting is not used.
7.2.11 Heater Manual Control
This setting turns on the intake heater, which heats the sample air to prevent
condensation in the intake tube and sample cell. On the newer design EC155
with vortex intake, all of the heat is applied at the inlet of the vortex, which
additionally helps to keep the inlet free from dew or frost. In the case of fog,
the heated inlet also aids in evaporating suspended water droplets in the sample
air stream. The default value of this setting is enabled with the maximum
voltage of 4.0 V applied. This will heat the sample air on the order of a few
degrees and will consume approximately 0.8 W of power.
U
U
i
Содержание EC155
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