Electrochemical sensors detect toxic gases through chemical reactions that produce electrical signals proportional to gas concentration. Gas diffuses into the sensor, an electrochemical reaction occurs, producing electrical current that is proportional to gas concentration.
Advantages include selective detection of specific gases, good sensitivity for toxic gases, low power consumption, suitability for portable instruments, and fast response time. These characteristics make electrochemical sensors ideal for personal monitoring and confined space applications.
Applications include toxic gas detection (H2S, CO, NH3), personal monitoring, area monitoring, confined space entry, and industrial safety. Common gases detected include hydrogen sulfide (H2S), carbon monoxide (CO), ammonia (NH3), chlorine (Cl2), and nitrogen dioxide (NO2).
Limitations include being limited to specific gases, potential cross-sensitivity, requiring periodic replacement, being affected by environmental conditions, and having limited operating temperature range. Understanding these limitations is important for proper sensor selection and application.
Maintenance requirements include regular calibration, sensor replacement schedule, environmental protection, and proper storage when not in use. Following manufacturer recommendations ensures reliable operation and accurate readings throughout the sensor's operational life.