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
- Zero drift is the change with temperature at 0 concentration.
- Span drift is the residual error after re-zeroing following a temperature change.
- Total drift is the change with temperature without re-zeroing or re-spanning.
Catalogue: PDF
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