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

Total Sample Volume: 28 cm3

Flow Rate:

250 sccm nominally in standard configuration

150 sccm nominally in high altitude configuration

70 sccm nominally with reduced flow rate kit installed

Total Weight: 10.5 kg (including batteries)

Case Dimensions: 51 × 33 × 18 cm (L × W × H)

Operating Temperature Range: -25 °C to 45 °C (without solar load)

Operating Humidity Range: 0 to 85% RH (non-condensing, without solar load)

Sample Line Humidity Range: 0 to 99.9% (non-condensing)

Operating Pressure Range:

70 to 110 kPa in standard and reduced flow rate configuration

50 to 110 kPa in high altitude configuration

Connectivity: Ethernet and 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 Watts at 25 °C without batteries charging

Warmup: Up to 65 W without batteries charging; up to 100 W with batteries charging

Off: Up to 2.3 W when powered from pins 3 and 4 without batteries charging; up to 0.2 W when powered from pins 1 and 5 without batteries charging

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: Universal Power Adapter (Input: 100 to 240 VAC, 50-60 Hz; Output: 24 VDC)

Battery Life: 8 hours typical with 2 batteries

Data Storage: Up to 5,356,800 records; about 62 days of continuous data collection

Pollution Degree: 2

Over-voltage Category: II

Class 1 Laser Product

CO2 measurements:

Range: 50 to 2,000 ppm

Precision (1σ): <0.05 ppm at 400 ppm with 5-minute averaging

Response Time (T10-T90): ≤2 seconds from 0 to 400 ppm

Maximum Drift: <0.5 ppm per 24-hour period

δ13C measurements:

Precision (1σ):

<0.5 ‰ with 1 second averaging

0.04 ‰ with 5-minute averaging

Maximum Drift: <1 ‰ per 24-hour period

δ18O measurements:

Precision (1σ): <0.1 ‰ at 400 ppm with 5-minute averaging

Maximum Drift: <4 ‰ per 24-hour period

δ17O measurements:

Precision (1σ): <0.4 ‰ at 400 ppm with 5-minute averaging

Maximum Drift: <12 ‰ per 24-hour period

NH3 Measurements

Range: 0 to 30,000 ppb

Precision (1σ): 2 ppb at 300 ppb with 1 second averaging

Response Time (T10-T90): ~5 minutes1

H2O Measurements

Range: 0 to 60,000 ppm

Precision (1σ):

45 ppm at 10,000 ppm at 1 second

20 ppm at 10,000 ppm with 5 second averaging

Dimensions

Figure C‑1. LI-7825 dimensions. Clearance is required for the power cable and tubing, as well as 2 to 3 cm around the case vents.

Specifications subject to change without notice.