Firefighter Level 2 Practice Test 2025 - Free Firefighter Practice Questions and Study Guide

An electrochemical sensor employs a reagent to detect a specific substance through electrochemical reactions. The reagent is essential because it interacts with the target molecule, generating a measurable electrical signal that indicates the presence and concentration of the substance being analyzed. This mechanism allows for precise detection and measurement, making electrochemical sensors highly effective in various applications, such as monitoring air quality or detecting hazardous materials.

Using an appropriate reagent is crucial because it must be selective for the substance of interest, ensuring that the sensor responds specifically to the target analyte rather than other compounds present in the environment. This specificity enhances the sensor's reliability and accuracy, which are critical in firefighting and safety applications.