Campbell Scientific EC150 CO2 and H2O Open-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer - Manual (Page 19)

EC150 CO
2
/H
2
O Open-Path Gas Analyzer
CSAT3 sonic reporting range
Full scale wind: ±65.6 m/s
Sonic temperature: − 50° to 60°C
Auxiliary sensors vii
Barometer
Internal basic barometer
Accuracy
− 30° to 0°C: ±3.7 kPa at −30°C, falling linearly to
±1.5 kPa at 0°C
0° to 50°C: ±1.5 kPa
Measurement rate: 10.0 Hz
Optional enhanced barometer
Manufacturer: Vaisala
Model: PTB110
Accuracy: ±0.15 kPa (−30°C to 50°C)
Measurement rate: 1.0 Hz
EC150 temperature sensor
Manufacturer: BetaTherm
Model: 100K6A1A Thermistor
Accuracy: ±0.15°C (−30 o to 50°C)
5.2 Output Signals
The EC100 electronics can output data from the EC150 by several means.
• Campbell Scientific SDM
• RS-485
• USB
• Analog out
Synchronous Device for Measurement communications protocol, or SDM, is a
proprietary serial interface developed by Campbell Scientific for
communication between a datalogger and a peripheral or sensor. In almost all
cases, SDM is the preferred communications protocol with the exception of
measurement heights requiring cable lengths greater than 100 meters. In this
case, RS-485 output is recommended. See Section 4.6.2.1, SDM Output, for
details on SDM output, see Appendix C, Alternate EC100 Outputs, for greater
detail on RS-485, USB, or analog outputs.
SDM communications are output as the FLOAT data type.
5.3 Physical Description
Optical measurement path length: 15.37 cm (6.05 in)
Spatial separation from
CSAT3A sampling volume: 5.0 cm (2.0 in)
vii refer to manufacturer’s product brochure or manual for details
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