This 1975 AC-Delco operator’s manual covers the Model ST-500 Infrared Emissions Analyzer, equipment designed to measure hydrocarbons (HC) and carbon monoxide (CO) in automotive exhaust. It provides operating, testing, diagnostic, calibration, maintenance, and technical information useful for understanding and preserving period emissions-testing equipment.
Major Topics Covered
– ST-500 hook-up, calibration, and emissions testing procedures
– Idle and fast-idle HC and CO testing and diagnosis
– Accelerator pump, PCV, cylinder, vacuum leak, and carburetor tests
– Infrared analyzer principles of operation and electronics
– Routine maintenance, schematics, service parts, and accessories
Manual Details
The manual includes procedures for air-injection system testing and fuel-leak diagnosis, along with technical descriptions of the optical bench and electronic circuitry. Detailed schematics cover the meter circuit, processor board, regulator/decoder board, converter board, and analyzer assembly.
Publication: AC-Delco Model ST-500 Infrared Emissions Analyzer Operators Manual
Release Date: June 1975
Equipment: AC-Delco Model ST-500
Educational Notice
This publication is provided free for historical and educational reference. Copyright remains with its respective owner. Sixth Gen Garage does not claim ownership of this publication.
