Oxygen sensor (O2 sensor) is an electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed. Zirconia oxygen sensors and Titanium oxygen sensors are two types of oxygen sensors. Based sensitivity, oxygen sensors are again two types, narrow-band and wide-band oxygen sensors. Oxygen sensors (O2 sensors) are mainly used for Air-Fuel Ratio (AFR) monitoring and control for ECU tuning of vehicle fuel economy and speed control.

Types of Oxygen sensors (O2 sensors)

Zirconium sensor and Titanium oxygen sensors are narrow-band oxygen sensors. The main problem with any narrow-band O2 sensors is that the Engine Control Module (ECM) only detects that the mixture is slightly richer or leaner than 14.7:1. The newer “wide-band” O2 sensor solves the narrow sensing problem of the previous Zirconium sensors. These sensors are often called by different names such as, continuous lambda sensors (lambda representing air-fuel ratio), AFR (air-fuel ratio sensors), LAF (lean air-fuel sensor) and wide-band Oxygen (O2) sensor. Regardless of the name, the principle is the same, which is to put the ECM in a better position to control the air/fuel mixture.

Non-Automotive Applications of Oxygen sensors (O2 sensors)

Zirconium Oxide Oxygen Sensors, Ambient Temperature Electrochemical Oxygen Senors, Paramagnetic Oxygen Sensors, Polarographic Oxygen Sensors, and Coulometric Oxygen Sensors are the five types of oxygen sensors being used for Oxygen Measurement, Oxygen Analyzers, Oxygen Detectors, and Oxygen monitoring applications.

  • The diving type of oxygen sensor, which is sometimes called an oxygen analyser or ppO2 meter, is used in scuba diving. Oxygen sensors are used to measure the oxygen concentration of breathing gas mixes such as nitrox and trimix. They are also used within the oxygen control mechanisms of closed-circuit rebreathers to keep the partial pressure of oxygen within safe limits.
  • In soil respiration studies, oxygen sensors are used for soil analysis. These sensors are buried at various depths to monitor oxygen depletion over time, which is then used to predict soil respiration rates.
  • In marine biology or limnology oxygen sensor measurements are usually done in order to measure respiration of a community or see wild life.
  • The Clark-type electrode is the most used oxygen sensor for measuring oxygen dissolved in a liquid.
  • An oxygen optode is a sensor based on optical measurement of the oxygen concentration.