LI-COR - LI-820

Manufactured by  LI-COR
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A Practical Analyzer for Continuous Monitoring

The LI-820 CO2 Analyzer is a low maintenance, economical gas analyzer designed for continuous monitoring applications. It is an absolute, non-dispersive infrared (NDIR) gas analyzer based upon a single path, dual wavelength, thermostatically controlled infrared detection system. It can be used in a wide range of demanding environmental conditions.
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Features of LI-820
  • Wide CO2 Measurement Range: 0-20,000 ppm
  • Wide Operating Temperature: -20° to +45°C
  • Low Power: Less than 4W after power up
  • Low Noise: Less than 1 ppm of noise @ 370 ppm, with 1 second signal filtering
  • Real Time Corrected Readings: On board sensors measure and correct for changes in cell temperature and pressure
  • User Cleanable Optics: The optical bench can be easily cleaned by the user; simply remove the source and detector headers and swab out the optical path (a cleaning kit is included with the LI-820). This reduces down-time due to contamination, and eliminates the need for factory recalibration.
General Specifications
Power Requirements Input Voltage 12-30 VDC; 1.2A @ 12V (14W) maximum during warmup with heaters on
Weight2.2 lbs
Additional Specifications

Measurement Range: 0-20,000 ppm
Accuracy: <3% of reading
Zero Drift(1): <0.15 ppm/°C
Span Drift(2): <0.03%/°C
Total Drift(3) at 370 ppm: <0.4 ppm/°C
RMS Noise at 370 ppm with 1 sec signal filtering: <1 ppm
Measurement Principle: Non-Dispersive Infrared
Traceability: Traceable gases to WMO standards from 0 to 3,000 ppm. Traceable gases to EPA protocol gases from 3,000 to 20,000 ppm
Pressure Compensation Range: 15 kPa - 115 kPa
Maximum Gas Flow Rate: 1 liter/min
Output Signals: Two Analog Voltage (0-2.5V or 0-5V) and Two Current (4-20mA) Digital: TTL (0-5V) or Open Collector
DAC Resolution: 14-bits across user-specified range
Source Life: 18,000 Hours (~2 years continuous use)
Operating Temperature Range: -20 to 45°C
Relative Humidity Range: 0 to 95% RH, Non-Condensing
Dimensions: 8.75" x 6" x 3" (22.23 x 15.25 x 7.62 cm)

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