YSI is a brand of Salemer Analytical Instruments that designs and manufactures sensors for water quality, velocity and flow measurement.

YSI's story began in 1948, when it was co-founded by engineer Hardy Trolander and chemists David Jones and John Benedict. The company began with a mission to solve local problems and has grown to become a leading global water quality monitoring solution provider.

Core technology and innovation

YSI Technology Features: YSI commercializes dissolved oxygen measurements using Clark polarographic membrane technology, giving the company a leading position in environmental monitoring. Products such as multi-parameter water quality monitors significantly extend instrument deployment time and improve work efficiency.

Innovative products: YSI introduced a range of innovative products such as optical sensors for measuring dissolved oxygen and blue-green algae, autonomous underwater vehicles and multi-beam acoustic Doppler profilers. These products are widely used in water quality mapping, biofuel processing and other fields.

Market positioning and application field

Municipal and industrial applications: YSI's products play an important role in municipal and industrial water quality monitoring, providing monitoring solutions from water intake, transportation, use to water return to the natural environment.

Environmental Monitoring: YSI focuses on the application of water quality and flow rate in the natural resource market, and its products are widely used in multiple environmental monitoring fields such as surface water, groundwater, sewage, and tap water.