Campbell Scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer - Manual (Page 30)

EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
The final option is to select None for the Pressure Sensor setting. The EC100
will use a fixed (see below) value for pressure. This mode is intended for
troubleshooting only.
7.2.10.1 Pressure Gain
If the Pressure Sensor is set to User Supplied, this setting gives the gain
factor (kPa/V) used to convert measured voltage to pressure. Normally the
Pressure Sensor is set to EC100 Basic or EC100 Enhanced, and this setting
is not used.
7.2.10.2 Pressure Offset
If the Pressure Sensor is set to User Supplied, this setting gives the offset
(kPa) used to convert measured voltage to pressure. Normally the Pressure
Sensor is set to EC100 Basic or EC100 Enhanced, and this setting is not
used.
7.2.10.3 Fixed Pressure Value
If the Pressure Sensor setting is None, the EC155 will use the value of this
setting for the barometric pressure. This mode is intended for troubleshooting
only. In normal operation this setting is not used.
7.2.11 Differential Pressure
The EC155 includes a differential pressure sensor to measure the pressure
difference between the inside of the sample cell and barometric pressure. With
the Auto-Select default, the EC100 detects the presence of the EC155 and
automatically enables the differential pressure measurement. This pressure
difference is then added to the barometric pressure measurement to give the
pressure in the sample cell.
The EC155 sample cell differential pressure sensor has a range of ± 7 kPa,
which will accommodate most applications. If the sample cell is to be used
outside this range, the user must disable the Differential Pressure sensor and
connect a user-supplied pressure sensor (see Section 7.2.10, Pressure Sensor).
7.3 ECMon
Settings for the EC155 are easily verified and/or changed by using the
Windows PC support software ECMon (ECMon is short for Eddy Covariance
Monitor), which is found on the EC150 & EC155 Support CD (pn 27007) or
on the company website in the Support|Downloads section
( www.campbellsci.com/downloads ).
Before installing ECMon, read the file titled Read.me.text found on the EC150
& EC155 Support CD. This will direct the user to install USB drivers (also
found on the Support CD), which are required for communications between the
PC and the EC100 via the EC100 USB cable (pn 26563). Once the drivers are
installed, download and run the ECMon.exe install file. Launch ECMon, and
connect the EC100 electronics to the PC with the included EC100 USB cable
(pn 26563). The USB connection for the EC100 electronics is found on the
bottom of the enclosure (see FIGURE 6-6). Once connected, select the
appropriate communications port in the ECMon Main Page and click Connect
(see FIGURE 7-1). Next click on the Setup button. All of the above settings
are now available for the user to change (see FIGURE 7-2).
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