Specifications

CO₂ Measurements

Calibration Range: 0 to 3000 µmol mol^-1

Accuracy: Within 1% of reading

Zero Drift (per °C):

±0.1 ppm typical

±0.3 ppm maximum

RMS Noise (typical @ 370 ppm CO₂):

@5 Hz: 0.08 ppm

@10 Hz: 0.11 ppm

@20 Hz: 0.16 ppm

Gain Drift (% of reading per °C @ 370 ppm):

±0.02% typical

±0.1% maximum

Direct Sensitivity to H₂O (mol CO₂ mol^-1 H₂O):

±2.00E-05 typical

±4.00E-05 maximum

H₂O Measurements

Calibration Range: 0 to 60 mmol mol^-1

Accuracy: Within 1% of reading

Zero Drift (per °C):

±0.03 mmol mol^-1 typical

±0.05 mmol mol^-1 maximum

RMS Noise (typical @ 10 mmol mol^-1 H₂O):

@5 Hz: 0.0034 mmol mol^-1

@10 Hz: 0.0047 mmol mol^-1

@20 Hz: 0.0067 mmol mol^-1

Gain Drift (% of reading per °C @ 20 mmol mol^-1):

±0.15% typical

±0.30% maximum

Direct Sensitivity to CO₂ (mol H₂O mol^-1 CO₂):

±0.02 typical

±0.05 maximum

General

Fundamental Gas Sampling Rate: 150 Hz

Bandwidth: 5, 10, or 20 Hz; software selectable

Type: Absolute, open-path, non-dispersive spectroscopy

Detector: Thermoelectrically cooled lead selenide

Path Length: 12.5 cm (4.92")

Air Temperature Thermistor: 10K ohm @ 25 °C thermistor; Accurate to ±0.5 °C

Pressure Sensor:

Range: 65 to 115 kPa absolute

Accuracy: ± 0.1% of full scale

Resolution: 0.002 kPa

Signal Noise (peak-to-peak): 0.002 kPa typical

Inputs: Ethernet, 4 analog input channels (±5 V, 16 bit)

Outputs: RS-232 (20 Hz Maximum); SDM (User selectable to 50 Hz); Ethernet; 6 user-scalable 16 bit DACs (0-5 V range, single-ended)

Operating Temperature Range: -25 to 50 °C (-40 to 50 °C verification on request)

Relative Humidity Range: 0-95% (non-condensing)

Data Storage: Removable industrial grade USB flash storage

Data Communication: Ethernet, Synchronous Device for Measurement (SDM; User-selectable to 50 Hz), RS-232 (115200 baud); 20 Samples/Sec. max., 6 DACs (single ended; 0-5 V)

Weatherproof Rating: Tested to IEC IP65 standard

User Interface: Windows® PC software

Power Requirements: 10.5 to 30 VDC

Power Consumption: Typically 30 W during warm-up (maximum 37 W at -40 °C), 8 to 18 W steady state (depending on ambient temperature)

Dimensions:

Head: Diameter 6.5 cm, Length 30 cm.

LI-7550 Analyzer Interface Unit: 35 ´ 30 ´ 15 cm

Cable: 5 meters. Head cable can be extended to 10 meters.

Weight:

Head: 0.75 kg

LI-7550 and Cables: 4.8 kg

Gas analyzer head dimensions

LI-7550 dimensions

SmartFlux 2 System

Data Inputs: Three RS-232/422/485 serial ports

Network Communication: Ethernet (TCP/IP)

Data Storage: USB port for 16 GB industrial grade flash drive

Operating Temperature Range: -25 to 50 °C (-40 to 50 °C verification on request)

GPS Antenna Operating Temperature Range: -30 °C to 80 °C

Relative Humidity Range: 0 to 95% (non-condensing)

Input Voltage: 10 to 30 VDC

Power Consumption: 1.5 watts typical (3.5 watts maximum; excluding pass-through power)

Max Current Passed Through to the Anemometer: 2 A

Dimensions with DIN Clip: 149 x 100 x 37 mm (L×W×H)

Weight with GPS Antenna: 1.32 lb. (0.59 kg)

GPS Antenna Diameter: 61 mm (2.4 in.)

GPS Cable Length: 5 m

GPS Accuracy:

GPS Standard Positioning Service: <15 m; 95% typical

WAAS: <3 m; 95% typical