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 2% 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, non-dispersive infrared gas analyzer

Detector: Thermoelectrically cooled lead selenide

Path Length: 12.5 cm (4.72")

Optical Cell Volume: 16 cm³

Optical Cell Thermocouples (Input and Output):

Max. Error: ±0.6 °C over -40 to +50 °C, with maximum departure from reference (block) temperature of ±20 °C

Frequency Response: >10 Hz half power response @ 15 lpm flow rate

Inputs: Ethernet, 4 analog input channels (Bipolar; ±5 V; 16 bit; 300 Hz)

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)

Differential Pressure Measurements:

Range: ±10 kPa.

Accuracy: 4% of reading

Resolution: 0.3 Pa

Absolute 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

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

Weight:

Head: 1.8 kg (3.95 lb.)

LI-7550 and Cables: 4.4 kg (10 lb.)

Dimensions:

Head: Diameter 7.5 cm, Length 31 cm

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

Head Cable: 5 meters. Can be extended to 10 meters

Other Cables: 5 meters

Gas analyzer head dimensions

LI-7550 and Flow Module dimensions

The LI-7550 and 7200-101 flow module have the same dimensions. The flow module requires additional clearence to allow the tube fittings.

Flow Module (7200-101 and 7200-102)

Flow Rate Settings: 10-18 SLPM (standard liters per minute) setpoint mode or constant blower drive mode.

Blower Pressure: 3.5 kPa minimum at 100% blower drive at 101.3 kPa and 27 °C ambient.

Accessory Link: UART on RS-485 cable.

Power Requirements:

10.5 - 30 VDC; 50 W Maximum

Typical <15 W @ 25 °C, 15 liters/min. at 0.75 kPa vacuum

Operating Conditions: -20 °C to +50 °C; IEC IP55 specified; Designed for outdoor installation

Size: 35 cm × 30 cm × 15 cm

Weight: 13.7 lbs. (6.2 kg).

Insulated Intake Tube (9972-053)

Outside Diameter: 0.25" (6.35 mm)

Inside Diameter: 0.21" (5.334 mm)

Wall Thickness: 0.020" (0.51 mm)

Length: 40" (101.6 cm)

Intake tube path length when assembled: 102 cm

Intake tube path length with Swagelok® filter: 106.5 cm

Material: 304 Stainless Steel

Heated Intake Tube

Input Voltage: 10.5 - 30 V

Total Output Wattage: 0.1 W to 6 W (Heat density ratio: 2:1 short tube to long tube)

Operating Temperature Range: -40 °C to 50 °C

Data Communication Protocol: RS-485

Intake Tube Inside Diameter: 5.33 mm (0.21”)

Intake Tube Outside Diameter: 6.35 mm (0.25”)

Intake Tube Length: 71.1 cm (28”)

Cable Length: 5 m (16.40’)

Intake Tube Weight: 0.54 kg (1.2 lbs)

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