Specifications

CO₂ measurements

• Measurement range: 0 to 20,000 ppm
• Accuracy
  • LI-850 Within 1.5% of reading
  • LI-830 Within 3% of reading
• Calibration drift
• Zero Drift¹: <0.15 ppm / °C
• Span Drift²: <0.03% / °C
• Total drift at 370 ppm: <0.4 ppm / °C
• RMS noise at 370 ppm with 1 sec signal filtering: <1 ppm
• Sensitivity to water vapor (LI-850 only): <0.1 ppm CO₂ / mmol mol^-1 H₂O
• Lower limit of detection 1.5 ppm

H₂O measurements (LI-850 only)

• Measurement range: 0 to 60 mmol mol^-1
• Accuracy: Better than 1.5% of reading
• Calibration drift
• Drift at 0 mmol mol^-1: <0.005 mmol mol^-1 / °C
• Span Drift¹ at 10 mmol mol^-1: <0.006 mmol mol^-1 / °C
• Total Drift at 10 mmol mol^-1 <0.016 mmol mol^-1 / °C
• RMS noise at 10 mmol mol with 1 sec signal filtering: <0.01 mmol mol^-1
• Sensitivity to CO₂: <0.0001 mmol mol^-1 H₂O / ppm CO₂
• Lower limit of detection: <0.015 mmol mol^-1

General

• Output rate: Up to 2 measurements per second
• Response time (T90)
• CO₂: <3.5 seconds from 0 to 375 ppm
• H₂O: <3.5 seconds from 0 to 21 mmol mol^-1
• Internal optical cell volume: 14.5 mL
• Measurement principle: Non-Dispersive Infrared
• Traceability:
• CO₂: Traceable gases to WMO standards from 0 to 3,000 ppm; traceable gases to EPA protocol gases from 3,000 to 20,000 ppm
• H₂O (LI-850 only): NIST traceable LI-610 Portable Dew Point Generator
• Pressure compensation range: 50 to 110 kPa
• Maximum gas flow rate: 1 liter min^-1
• Output signals: Two analog voltage (0 to 2.5 V or 0 to 5 V) and two current (4 to 20 mA)
• Digital outputs: TTL (0 to 5 V) or Open Collector
• DAC resolution: 16 bits across user-specified range

Power requirements

• Input voltage: 12-30 VDC
• After warmup (without pump): 0.33A @ 12 VDC (4.0 W) average
• After warmup (with pump): 0.42A @ 12 VDC (5.0 W) average
• During warmup: 1.2 A @ 12 VDC (14 W) maximum
• Operating temperature range: -20°C to 45 °C
• Relative humidity range: 0 to 95% RH, Non-condensing
• Dimensions: 22.23 cm W x 15.25 cm D x 7.62 cm H

Weight

• No pump, no display: 1.0 kg
• No pump, with display: 1.02 kg
• With pump, no display: 1.3 kg
• With pump, with display: 1.32 kg

Pump specifications (optional)

• Operating temperature range: 5 to 45 °C
• Storage temperature range: -20 to 60 °C
• Operating humidity range: 0 to 80% RH
• Nominal flow rate: 0.75 liters minute^-1
• Power consumption: 1 W (nominally)
• Expected life span: 8,000 hrs in standard conditions with a normal load

Display specifications (optional)

• Dimensions: 6.7 cm corner-to-corner
• Resolution: 400 x 200 px; monochrome
• Power consumption: <200 µW
• Displayed variables: CO₂ reading, H₂O reading (LI-850 only), optical bench temperature, and pressure.