application area

main features

Optional models

Technical Parameter

CO₂measure

Range: 0~20000 μ mol/mol
Accuracy: better than 3% of the reading value (LI-830);
Better than 1.5% of the reading value (LI-850)
Calibration Drift

Zero drift (℃)^-1)¹：＜ 0.15 μmol/mol
Span drift (℃)^-1)²：＜ 0.03 %
Total drift (℃)^-1)³：< 0.4 μmol/mol @ 370 μmol/mol

RMS noise: 1s signal average,< 1 μmol/mol @ 370 μmol/mol
Sensitivity to water vapor (LI-850 only):< 0.1 μmol/mol CO₂ / mmol/mol H₂O
Detection limit: 1.5 μ mol/mol

H₂OMeasurement (LI-850 only)

Range: 0-60 mmol/mol
Accuracy: better than 1.5% of the reading value
Calibration Drift

Zero drift (℃)^-1)：< 0.005 mmol/mol @ 0 mmol/mol
Span drift (℃)^-1)：< 0.006 mmol/mol @ 10 mmol/mol
Total drift (℃)^-1)：< 0.016 mmol/mol @ 10 mmol/mol

RMS noise: 1s signal average<0.01 mmol/mol @ 10 mmol/mol
Regarding CO₂Sensitivity:< 0.0001 mmol/mol H₂O / μmol/mol CO₂

Pump (optional)

Working environment: 5~45 ℃, 0~80% RH
Storage temperature range:- 20~60 ℃
Typical flow rate: 0.75 L/min
Power: 1 W
Expected lifespan: Approximately 8000 hours of regular use

Display screen (optional)

Size: 6.7 cm (diagonal)
Resolution: 400 × 200 pixels monochrome
Power consumption:< 200 μW
Displayed variables: CO₂Read value, H₂O-reading value (LI-850 only), optical path temperature and air pressure

Conventional technical parameters

Output frequency: 2 Hz
Response time (T90) CO₂：< 3.5s @ 0-375 μmol/mol； H₂O：<3.5s @ 0-21 mmol/mol
Measurement principle: Non dispersive infrared
Traceability:

CO₂： 0-3000 μ mol/mol traceable gas calibration using WMO standards, 3000-20000 μ mol/mol traceable gas calibration using EPA protocol standards
H₂O (LI-850 only): Calibration using LI-610 portable dew point generator, NIST traceable

Pressure compensation range: 50-110 kPa
Maximum airflow velocity: 1 L/min
Output signal: Dual analog voltage (0-2.5 V or 0-5 V) and dual current (4-20mA)
Digital output: TTL(0-5 V)
DAC resolution: 16 bits within the user specified range
Power supply demand:

Input voltage: 12-30 VDC

After preheating (excluding pump): average 0.33A@12 VDC(4.0W)

After preheating (including pump): average 0.42A@12 VDC(5.0W)

During preheating: average 1.2A@12 VDC(14W)

Operating temperature range:- 20 ~ 45 ℃
Relative humidity range: 0-95% RH, non condensing
Size: 22.23 × 15.25 × 7.62 cm (8.75 "× 6" × 3 ")
Quality: No pump, no display screen: 1.0 kg; Pump: 0.02kg; Display screen: 0.3kg
Internal optical path volume: 14.5 mL

¹Zero drift refers to the variation of measured values with temperature when the gas concentration is 0.
²Span drift refers to the residual after resetting to zero as the temperature changes.
³Total drift refers to the variation of readings with temperature without recalibration

Origin and Manufacturer: LI-COR Corporation, USA