industrial instrumentation basics

Oxygen Gas Analyzers: Measurement Methods and How They Work What Is a Gas Analyzer? A gas analyzer is an instrument that measures or tracks the concentration of a particular gas within a sample. In industrial settings, these instruments are used to monitor gases like oxygen, carbon monoxide, NOx, and SO2 — supporting smooth process operation, fuel efficiency, and environmental compliance. Oxygen is one of the most commonly measured gases in industry, and there are four established methods for measuring its concentration:  zirconia, paramagnetic, optical (TDL), and electrochemical. 1. Zirconia Oxygen Analyzer Zirconia is a solid-state electrolyte material that becomes conductive to oxygen ions once heated to roughly 800°C. How It Works A zirconia gas analyzer works by attaching porous platinum electrodes to both faces of a heated zirconia element. Two different gas samples — each with its own partial oxygen concentration — are brought into contact with opposite sides of the ele...