Campbell Scientific EC150 CO2 and H2O Open-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer - Manual (Page 32)

EC150 CO
2
/H
2
O Open-Path Gas Analyzer
TABLE 6-1. EC100 SDM output to a Campbell Scientific CR1000,
CR3000, or CR5000 Datalogger
EC100 Channel Description Color
SDM-C1 SDM Data Green
SDM-C2 SDM Clock White
SDM-C3 SDM Enable Brown
G Digital Ground Black
G Shield Clear
6.3.6 Wire Power and Ground the EC100
1. Feed cable CABLEPCBL-L (pn 21969-L) through Cable 2 at the bottom
of the EC100 enclosure (see FIGURE 6-12) and attach the ends into the
green EC100 power connector (pn 3768).
2. Plug the connector into the female power connector on the EC100 panel.
Ensure that the power and ground ends are going to the appropriate
terminals labeled 12V and ground, respectively.
3. Connect the power cable to a power source. The power and ground ends
may be wired to the 12V and G ports, respectively, of a Campbell
Scientific datalogger or to another 12 Vdc source.
Once power is applied to the EC100, three LED status lights on the EC100
panel will illuminate. The power LED will be green if the power supply
voltage is between 10 to 16 Vdc. The gas LEDs will be orange until the gas
head has warmed up. The sonic LED will be red while the sonic acquires the
ultrasonic signals. The sonic and gas LEDs will turn green if there are no
diagnostic warning flags. Three green LEDs indicate that the instrument is
ready to make measurements.
The EC150 power-up sequence takes under two minutes to complete. During
power up the gas LED will be orange. If after two minutes the gas LED turns
green, power-up sequence has been completed successfully. If the gas LED
turns red, a diagnostic flag has been detected. Check the individual diagnostic
bits to determine the specific fault.
Diagnostics may be monitored using the Status window of ECMon (see
Appendix A.3, ECMon), the user interface software included with the EC150
(see Appendix A, EC150 Settings), or with a datalogger. The diagnostics may
reveal that the unit needs to be serviced (for example, cleaning the optical
windows on the EC150, cleaning the CSAT3A transducers of ice or debris, etc.
See Section 8, Maintenance and Troubleshooting).
7. Zero and Span
7.1 Introduction
Calibration of optical instrumentation like the EC150 may drift slightly from
the calibration that was performed in the factory with time and exposure to
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