H2O Analyzers

Specifications:

CO2 Measurements

  • Measurement range: 0-20,000 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 ppm3: <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: 0-60 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

Pump (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 (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.

General

  • Output rate: Up to 2 measurements per sec
  • Response time (T90):
    • CO2: <3.5 seconds from 0-375 ppm
    • H2O: <3.5 seconds from 0-21 ppm mmol mol-1
  • Measurement principle: Non-Dispersive Infrared
  • Traceability:
    • CO2: Traceable gases to WMO standards from 0-3,000 ppm; traceable gases to EPA protocol gases from 3,000-20,000 ppm
    • H2O (LI-850 only): NIST traceable LI-610 Portable Dew Point Generator
  • Pressure compensation range: 50-110 kPa
  • Maximum gas flow rate: 1 liter min-1
  • Output signals: Two analog voltage (0-2.5 V or 0-5 V) and two current (4-20 mA)
  • Digital outputs: TTL (0-5V) 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 x 15.25 x 7.62 cm (8.75” x 6” x 3”)
  • 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
  • Internal optical cell volume: 14.5 mL
  1. Zero drift is the change with temperature at 0 concentration.
  2. Span drift is the residual error after re-zeroing following a temperature change.
  3. Total drift is the change with temperature without re-zeroing or re-spanning.

Catalogue: PDF

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