Electrochemical sensors are widely used for detecting toxic or reactive gas impurities like carbon monoxide (CO), hydrogen sulfide (H₂S), and oxygen (O₂) in trace amounts.
- Principle: The target gas diffuses into a cell and undergoes a redox reaction, generating a current proportional to the gas concentration.
- EP Use Case: Measurement of trace CO in oxygen and compressed air, or monitoring residual O₂ in carbon dioxide.
- Advantages: Portable, easy to maintain, and well-suited for on-site or routine batch release testing.
