Trace Gas Analyzers

LI-7815 CO2/H2O Trace Gas Analyzer

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Imagen de: LI-7815 CO2/H2O Trace Gas Analyzer

High precision CO2 monitoring

The LI-COR LI-7815 CO2/H2O Trace Gas Analyzer provides exceptionally stable and precise measurements for long-term atmospheric monitoring measurements. CO2 measurements drift less than 0.2 ppm per 24-hour period with 0.04 ppm precision (1σ, with 5-second averaging) at 400 ppm CO2 in dry air at STP.

LI-7815 Specifications

General

  • Measurement Technique: OF-CEAS (Optical Feedback-Cavity Enhanced Absorption Spectroscopy)
  • Measurement Rate: 1 sample per second (1 Hz)
  • Optical Cavity Volume: 6.41 cm3
  • Flow Rate: 250 sccm (nominally)
  • Total Weight: 10.5 kg (including batteries)
  • Case Dimensions: 51 cm L x 33 cm W x 18 cm H
  • Operating Temperature Range: -25 °C to 45 °C (without solar load, under normal operating conditions)
  • Operating Humidity Range: 0 to 85% RH (non-condensing, without solar load, under normal operating conditions)
  • Sample Line Humidity Range: 0 to 99.9% non-condensing
  • Operating Pressure Range: 70 to 110 kPa
  • Connectivity: Ethernet, Wi-Fi (not available in some countries)
  • Wi-Fi Compatibility: 2.4 GHz, 802.11 a/b/g/n/ac
  • Power Consumption:
    • Steady State Operation: 22 W at 25 °C
    • Warmup (10.5 to 33 VDC power supply, pins 3 and 4): Up to 90 W
    • Warmup (Universal power supply or 24VDC power supply, pins 1 and 5): Up to 140 W with batteries charging
  • Power Supply: Universal Power Adapter (Input: 100 to 240 VAC, 50-60 Hz; Output: 24 VDC)
  • Battery Life: 8 hours typical with 2 batteries

CO2/H2O Measurements

  • Response Time (T10-T90): CO2 ≤ 2 seconds, 0 to 400 ppm

CO2 Measurements

  • Measurement Range: 1 to 10,000 ppm
  • Precision (1σ):
    • 0.10 ppm at 400 ppm with 1 second averaging
    • 0.04 ppm at 400 ppm with 5 second averaging
  • Maximum Drift: < 0.2 ppm per 24-hour period

H2O Measurements

  • Measurement Range: 100 to 60,000 ppm
  • Precision (1σ):
    • 45 ppm at 10,000 ppm with 1 second averaging
    • 20 ppm at 10,000 ppm with 5 second averaging
Imagen de LI-7815 CO2/H2O Trace Gas Analyzer

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