# Electrochemical Sensor #detection-technology #sensor #toxic-gas Electrochemical sensors detect toxic gases through chemical reactions that produce electrical signals proportional to gas concentration. ## Principle - Gas diffuses into sensor - Electrochemical reaction occurs - Produces electrical current - Current proportional to gas concentration ## Advantages - Selective detection of specific gases - Good sensitivity for toxic gases - Low power consumption - Suitable for portable instruments - Fast response time ## Applications - Toxic gas detection (H2S, CO, NH3) - Personal monitoring - Area monitoring - Confined space entry - Industrial safety ## Limitations - Limited to specific gases - May have cross-sensitivity - Requires periodic replacement - Affected by environmental conditions - Limited operating temperature range ## Common Gases Detected - Hydrogen Sulfide (H2S) - Carbon Monoxide (CO) - Ammonia (NH3) - Chlorine (Cl2) - Nitrogen Dioxide (NO2) ## Maintenance - Regular calibration required - Sensor replacement schedule - Environmental protection - Proper storage when not in use