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General| Type | Open-path gas analyzer |
|---|---|
| Measurement Principle | Non-Dispersive Infrared (NDIR) |
| CO2 Measurement Range | 0-2000 ppm |
| H2O Measurement Range | 0 to 60 mmol/mol |
| CO2 Accuracy | ± 1.5% of reading |
| Operating Temperature | -25 °C to 50 °C |
| Operating Humidity Range | 0 to 100% RH (non-condensing) |
| Power Requirements | 12-30 VDC |
| Outputs | Analog and digital |
General overview and key features of the LI-7500 analyzer.
Basic steps for setting up the LI-7500 to collect and record data.
Explains the relationship between gas concentration and absorption.
Details how absorptance is measured by the LI-7500.
Discusses cross-sensitivity between gases and its correction.
Explains temperature-induced drift in detector readings.
Provides a summary of fundamental equations used in calculations.
Describes how pressure and temperature are measured.
Discusses the importance of pressure and temperature for calculations.
Covers physical installation, cables, and software installation.
Covers using the LI7500 PC software for operation and configuration.
Discusses environmental factors affecting performance.
Overview of calibration components: coefficients, zero, and span.
Factors affecting the stability of zero and span parameters.
Procedures and materials for checking the zero point.
Procedures and standards for checking the span.
Explanation of what occurs when setting zero and span parameters.
Detailed instructions for performing zero and span calibration.
Instructions for cleaning the analyzer's optical windows.
Procedure for replacing the internal fuse.
Steps for replacing soda lime and magnesium perchlorate bottles.
Solutions for issues related to the instrument not powering on.
Troubleshooting steps for establishing PC communication.
Diagnosing and fixing incorrect temperature/pressure readings.
Identifying and resolving issues with gas concentration readings.
Explains 'Optical Bench' indicators and their meanings.
Lists common error messages and their descriptions.
Key technical specifications of the LI-7500 analyzer.
Detailed performance metrics for CO2 and H2O measurements.
Wiring details for connecting the sensor head to the main board.
Pin assignments for various interface cables.
List of suppliers for soda lime and magnesium perchlorate.
Overview of the protocol for LI-7500 RS-232 communication.
Command structure for configuring data output parameters.
Command structure for scaling auxiliary inputs.
Commands for controlling calibration and coefficients.
Command for querying configuration parameters.
Command for resetting the instrument's software.
Covers Chart, Connect, and Log settings.
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