LI-840 Specifications

CO₂ Specifications

Measurement Range:  0-3000 ppm

Accuracy:  Better than 1.5% of reading

Calibration Drift

          ¹Zero Drift:  < 0.15 ppm/ °C

          ²Span Drift at 370 ppm:  < 0.03%/ °C

          ³Total Drift at 370 ppm:  <0.4 ppm/ °C

RMS Noise at 370 ppm with 1 sec Signal Filtering: < 1 ppm

Sensitivity to Water Vapor: < 0.1 ppm CO₂/ppt H₂O

H₂O Specifications

Measurement Range:  0-80 ppt

Accuracy:  1.5% of reading

Calibration Drift

          Zero Drift:  < 0.003 ppt/ °C
          Span Drift at 10 ppt:  < 0.03%/ °C          Total Drift at 10 ppt:  < 0.009 ppt / °C

RMS Noise at 10 ppt with 1 sec Signal Filtering: < 0.01 ppt

Sensitivity to CO₂:  < 0.0001 ppt H₂O/ppm CO₂

¹Zero drift is the change with temperature at 0 concentration
²Span drift is the change after re-zeroing following a temperature change
³Total drift is the change with temperature without re-zeroing or re-spanning

Measurement Principle:  Non-Dispersive Infrared

Traceability:  Traceable gases to WMO standards for CO₂. NIST certified LI-610 Portable Dew Point Generator for H₂O

Pressure Compensation Range:  15 kPa-115 kPa

Maximum Gas Flow Rate:  1 liter/minute

DAC Resolution:  14-bits across user-specified range

Source Life:  18000 hours

Supply Operating Range:  12-30 VDC

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)

Weight:  2.2 lbs (1 kg)