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LI-7835 H2/CH4/H2O Trace Gas Analyzer

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Simultaneous H2 and CH4 measurements

The LI-7835 H2/CH4/H2O Trace Gas Analyzer provides direct and precise trace concentration measurements of both gaseous H2 and CH4 simultaneously. Its measurements automatically compensate for humidity and report gas concentrations in dry mole fractions at ppm precision and 1 Hz data rate.

The trusted results your work requires

As the newest analyzer in the trusted LI-COR Trace Gas Analyzer family, the LI-7835 upholds the same high standards and capabilities you’ve come to expect. It takes direct, accurate, and selective gaseous H2 measurements with unparalleled specificity and responds in seconds. It also features a durable, weather-resistant design and low operation costs that make it suitable for your work, wherever it may take you.

  • High-precision and simultaneous H2 and CH4 measurements
  • Automatic water vapor correction and reports in dry mole fractions
  • Access to real-time concentration data on phone or table
  • Battery-powered, portable design with low operation costs
  • Compatible with LI-COR soil gas measurement systems
Trace Gas Analyzer features diagram

* Wi-Fi connectivity limited in some countries

The proof is in the data

The LI-7835 offers simultaneous and selective H2 and CH4 measurements needed for a broad range of applications from lab to field. The evidence of its precision and specificity is reflected in its measurement data.

dataset
Figure 1. The Stability and Allan Deviation of LI-7835 measuring a primary H2 gas standard at 498.1 ppm (± 2%) in air

LI-7835 Specifications

H2 Measurements

  • Response Time (T10-T90): ≤ 3 seconds
  • Range: 0 to 2.5%
  • Precision (1σ):
    • 5 ppm at 10 ppm with 1 second averaging
    • 3 ppm at 10 ppm with 5 second averaging

CH4 Measurements

  • Range: 0 to 2.5%
  • Precision (1σ):
    • 0.5 ppm at 2 ppm with 1 second averaging
    • 0.25 ppm at 2 ppm with 5 second averaging

H2O Measurements

  • Range: 0 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

General Specifications

  • Measurement Technique: OF-CEAS (Optical Feedback – Cavity Enhanced Absorption Spectroscopy) direct molecule measurements
  • Measurement Rate: 1 sample per second (1 Hz)
  • Optical Cavity Volume: 6.4 cm3
  • Flow Rate: 150 sccm nominal
  • Total Weight: 10.5 kg (including batteries)
  • Case Dimensions: 51 cm × 33 cm × 18 cm (L × W × 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% non-condensing
  • Operating Pressure Range: 50 to 110 kPa
  • Connectivity: Ethernet and Wi-Fi*
  • Wi-Fi Compatibility: 2.4 GHz, 802.11 a/b/g/n/ac*
  • Power Consumption:
    • Steady State Operation: 22 Watts at 25 °C without batteries charging
    • Warmup: up to 100 W with batteries charging
  • DC Power Supply Requirements:
  • Pins 1 and 5 (24 VDC Input): Minimum 6 A at 24 V
  • Pins 3 and 4 (10.5 to 33 VDC Input): Minimum 14 A at 10.5 VDC; 6 A at 24 VDC
  • Power Supply Adapter (included): Universal Power Adapter (Input: 100 to 240 VAC, 50-60 Hz; Output: 24 VDC)
  • Battery Life: 8 hours typical with 2 batteries
  • U.S. Patents: 8,659,758; 8,665,442; 8,885,167; 9,116,047; 9,194,742; 9,304,080; 9,581,492; 9,678,003; 9,759,654; 9,759,655; 9,989,729; 10,514,299; 10,527,492 and 11,441,944.

*not available in some countries

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