
EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
1
noise rms, assumes:
o 25°C
o 85 kPa
o 19 mmol/mol H
2
O concentration
o 326 mmol/mol CO
2
concentration
o 25 Hz bandwidth.
2
user selectable
3
-30° to 50°C
4
noise rms
5
assumes:
o -30° to +50°C
o wind speed <30 m·s
-1
o azimuth angles between ±170°
6
refer to manufacturer’s product brochure or manual for details
5.2 Output Signals
Features
• EC100 electronics outputs data using:
o CS SDM
o RS-485
o USB
o Analog out
Digital
SDM (Synchronous Device for Measurement)
1
Data type: FLOAT
RS-485
Data type: ASCII
Output Rate
2
: 5 to 50 Hz
Baud rate
2
: 1200 to 230400 bps
USB
Data type: ASCII
Output rate
2
: 10, 25 or 50 Hz
Analog (two outputs for CO
2
and H
2
O molar mixing ratios)
Voltage range: 0 mV to 5000 mV
Resolution: 76 µV (16 bit)
Update rate: 150 Hz
Accuracy (at 25
o
C): ±3 mV
CO
2
mixing ratio equation: µmol/mol = 211.27 (V
out
) – 56.34
Full scale range: -56 to 1000 µmol/mol
H
2
O mixing ratio equation: mmol/mol = 11.31 (V
out
) – 3.04
Full scale range: -3 to 53 mmol/mol
1
Synchronous Device for Measurement. A Campbell Scientific, Inc. proprietary serial interface
for datalogger to peripheral and sensor communication. See Section 8.1, SDM Output for details.
2
user selectable
5
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