# Cross-Sensitivity #detection-technology #calibration #safety Cross-sensitivity is the tendency of gas detectors to respond to gases other than their intended target gas, which can lead to false readings or alarms. ## Problem When multiple gases are present, cross-sensitivity can cause: - False positive readings - Incorrect concentration measurements - Misleading alarm conditions ## Examples - Carbon monoxide (CO) detectors may react to hydrogen, ammonia, or methane - Sensors calibrated for one gas may respond to similar gases - Cross-sensitivity varies by sensor type and technology ## Solutions 1. **Selective Filters**: Use filters to reduce interference from non-target gases 2. **Surrogate Calibration**: Calibrate using cross-calibration factors for mixed environments 3. **Target Gas Calibration**: Always prefer calibrating with the actual target gas when possible 4. **Sensor Selection**: Choose sensors with minimal cross-sensitivity for the application ## Best Practices - Consider all gases present in the environment during detector selection - Account for cross-sensitivity when calibrating detectors - Use selective detection methods when multiple gases are present - Document cross-sensitivity characteristics for each sensor type ## Related Concepts - [[Gas Detection Calibration]] - [[Catalytic Bead Sensor]] - [[Electrochemical Sensor]]