Campbell Scientific IRGASON Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer - Manual (Page 24)

IRGASON ® Integrated CO
2
/H
2
O Open-Path Gas Analyzer and 3D Sonic Anemometer
3. Connect the IRGASON temperature probe. Unscrew the temperature
connector cover, which is found on the base of the EC100 enclosure (see
FIGURE 6-6). Insert the 3-prong probe connector into the female
connector on the enclosure and screw it firmly in place. The IRGASON
temperature probe cable is approximately 3 meters in length.
4. Ground the EC100 by attaching a thick wire (e.g., 12 AWG) to the
grounding lug found on the base of the EC100 enclosure. The other end of
the wire should be connected to earth (chassis) ground using a grounding
rod. For more details on grounding, see the CR3000 datalogger manual,
grounding section.
Grounding electronics such as the EC100 is critical in a
measurement system. Proper grounding to earth (chassis)
will ensure maximum ESD (electrostatic discharge)
protection and improve measurement accuracy.
Do not connect or disconnect the gas analyzer or sonic
connectors while the EC100 is powered.
5. Connect a communications signal cable to the EC100. Loosen the nut on
one of the cable entry seals (Cable 1 or Cable 2) on the base of the EC100
enclosure, remove the plastic plug (plug may be stored in mesh pocket of
enclosure), insert the cable, and retighten the nut by hand. Refer to the
sections below on SDM, USB, RS-485, and Analog communications for
information on required signal cable types and connections to the EC100
panel.
o SDM communications: Use cable CABLE4CBL-L (pn 21972).
“L” denotes the length of the cable, which is customer-specified
at time of order. TABLE 6-1 details which color of wire in the
cable should be connected to each terminal found on the SDM
connector of the EC100 panel.
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 Red (or Brown)
G Digital Ground Black
G Shield Clear
o USB communications: Use the EC100 USB cable (pn 26563) to
connect a PC to the base of the EC100 enclosure.
o RS-485 communications: use cable CABLE3TP-L (pn 26987)
for lengths less than 500 ft. The connector on the EC100 panel
labeled RS-485 displays which terminals are for receiving and
transmitting.
CAUTION
CAUTION
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