# Index - Detection Technologies #index #detection-technology Comprehensive guide to fire and gas detection technologies and sensor types. ## Sensor Technologies ### Flammable Gas Detection - [[Catalytic Bead Sensor]] - Catalytic oxidation sensors for LEL detection - [[IR Absorption]] - Infrared absorption for selective gas detection - [[Open Path Detection]] - Area coverage using IR beams ### Toxic Gas Detection - [[Electrochemical Sensor]] - Chemical reaction-based toxic gas sensors ### Fire Detection - [[Flame Detection]] - UV, IR, and combination flame detectors ## Detection Principles - [[Cross-Sensitivity]] - Understanding sensor interference - [[Gas Detection Calibration]] - Calibration methods and best practices ## Technology Comparison | Technology | Applications | Advantages | Limitations | |------------|-------------|------------|-------------| | [[Catalytic Bead Sensor]] | Flammable gases, LEL | Cost-effective, proven | Requires oxygen, catalyst poisoning | | [[IR Absorption]] | Hydrocarbons, methane | Selective, no oxygen needed | More expensive, IR-transparent gases only | | [[Electrochemical Sensor]] | Toxic gases (H2S, CO) | Selective, low power | Limited to specific gases | | [[Flame Detection]] | Fire detection | Fast response | Line-of-sight required | ## Selection Criteria When selecting detection technology, consider: - Target gas(es) to be detected - Environmental conditions - Required sensitivity and response time - Cost and maintenance requirements - Cross-sensitivity concerns - Oxygen availability ## Related Concepts - [[Gas Detector Placement]] - Where to install detectors - [[Alarm Thresholds]] - Setting detection levels - [[F&G Control Systems]] - System integration