Campbell Scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer - Manual (Page 15)

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