Dissolved oxygen sensors (DO) measure the concentration of oxygen gas in water, crucial for aquatic life and water quality. Two main types exist: electrochemical (amperometric or galvanic) sensors, which detect a current generated by oxygen-consuming reactions, and optical (luminescent) sensors, which rely on oxygen-dependent light quenching by a special dye. DO sensors are vital for monitoring environmental conditions and industrial processes by acting as a “vital sign monitor” for water systems, ensuring balance and preventing issues like suffocation or corrosion.
