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.

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)
20	0.025	6	39	0.4	3
1	0.5	25	173	2	12
0.5	1	35	245	2	17
0	20	157	1096	11	75

Table 1. Noise Specifications.