LI-7000 Specifications

  • Type: Differential, non-dispersive infrared gas analyzer.
  • Detectors: Two solid-state detectors; one each for CO2 and H2O, filtered at 4.255 and 2.595 microns, respectively.
  • Chopping Frequency: 600 hertz.
  • Source: Single source.
  • Optical Bench: One optical bench. Sample cell size: 9.53 mm Dia. x 152.4 mm L (3/8" x 6"). Volume: 10.86 cm3.
  • Warm-up Time: Approximately 2 minutes to operation; 2 hours to temperature equilibration.
  • Gas Pressure: Maximum allowable pressure is 115 kPa (17 psi) with pressure sensor connected. 200 kPa (29 psi) max. w/o pressure sensor connected.
  • Maximum Flow through Analyzer: >50 liters/min.
  • Internal Pump: Yes - variable; up to 1 liter/min.
  • Display: 40 character x 8 line backlit LCD. 3 numeric screens available.
  • Graphing: 3 graphing screens available with 1-3 graphs per screen.
  • Back Panel Connections:
    • USB: 2.0 compliant, up to 50 Hz.
    • RS-232: 9600-115200 baud, 8, N, 1. Supports XON/XOFF and trigger input.
    • Analog: 4 user-scalable 14 bit DACs, 20 Hz bandwidth at 300 Hz update frequency.
    • Auxiliary Input Channels: 2, ±2.5V, 10 Hz bandwidth.
  • Tubing Connections: Swagelok
  • Power Requirements: 100-240 VAC, 50-60 Hz, or 10.5-16 VDC, 4 amps max.
  • Power Consumption: 15-40 Watts (dependent on ambient temperature and pump usage).
  • Temperature Range: 0-50 °C ambient, 0-55 °C bench.
  • Size: 5" H x 9.875" D x 14.5" L (12.7 x 25 x 36.8 cm).
  • Weight: 19.4 lbs. (8.8 kg).

CO2 Specifications

  • Range: 0-3000 ppm
  • Accuracy: Within 1% nominally.
  • Zero Drift (with temperature): ±0.3 ppm/°C.
  • Span Drift: ±0.2% of reading/°C.
  • Water Sensitivity: <0.1 ppm CO2/mmol/mol H2O (Software algorithm corrects for band broadening effects).
  • Calibration: Factory linearization over 0-3000 ppm range using NIST-traceable standard gases.
  • Pressure Range: 0 to 115 kPa absolute.
  • Display Resolution: 0.01 µmol/mol.
  • Signal Noise: See Table 1.

H2O Specifications

  • Range: 0-60 mmol/mol. Optical bench and interconnecting hoses must be maintained above the dew point temperature by the user.
  • Accuracy: 1%.
  • Zero Drift: ±0.02 mmol/mol/°C.
  • Span Drift: ±0.4% of reading/°C.
  • Signal Noise: See Table 1.
Noise Specifications (Typical)
 CO2 (370 ppm)H2O (10 mmol/mol)
Average Time (s)Bandwidth (Hz)RMS Noise (ppb)Peak-to-Peak (ppb)RMS Noise (ppm)Peak-to-Peak (ppm)
200.0256390.43
10.525173212
0.5135245217
02015710961175

Table 1. Noise Specifications.


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