Syremätare

Syremätare is a device designed to measure the concentration of oxygen in a sample. The term covers instruments used to determine either oxygen in gases or dissolved oxygen in liquids. In gas applications, syremätare monitor oxygen partial pressure or volume fraction in air and industrial gas streams. They rely on several sensing technologies, including electrochemical galvanic sensors, paramagnetic sensors, and zirconia-based sensors. Electrochemical sensors are common in portable meters and offer low power consumption; paramagnetic sensors provide fast response and robust long-term stability; zirconia sensors are well suited to inline process control and high temperatures.

In liquids, dissolved oxygen meters are used in water treatment, aquaculture, fermentation, and environmental monitoring. These meters typically employ polarographic (Clark-type) electrodes or optical sensors that measure luminescence quenching to determine DO levels.

Operation and maintenance: measurement accuracy depends on calibration against known references and compensation for temperature, salinity (for seawater), and flow conditions. Regular sensor replacement and membrane care are required to maintain performance. Portable models enable field measurements, while fixed sensors are installed in process lines or reactors.

Safety and limitations: sensor drift, cross-sensitivity to reducing or oxidizing gases, and environmental conditions can affect readings. Proper calibration, known gas standards, and routine maintenance are essential for reliable results.

See also: oxygen sensor, dissolved oxygen meter, pulse oximeter (related in contexts of measuring oxygen in different media).