Founded in 1992 on the premise that precision water velocity measurement should be practical, affordable, and easy, SonTek/YSI today offers the widest variety of acoustic Doppler instrumentation on earth.

In July, 2001, YSI Incorporated of Yellow Springs, Ohio, acquired the assets of SonTek and formed a new company, SonTek/YSI, that operates as a wholly-owned subsidiary of YSI Incorporated. The synergistic relationship between SonTek and YSI greatly enhances the quality and breadth of service that is now available in the fields of water testing, water monitoring, and water velocity measurements

YSI Environmental - water quality instruments

Since our invention of the Acoustic Doppler Velocimeter in 1993, our product line has grown into a diverse, multi-faceted mix of high technology instruments designed for a wide variety of applications. Put simply, our instruments tell you how fast the water is moving, where it is moving, and even if it is not moving at all. On top of that, just about all our products are offered with an array of ancillary sensors for complete environmental monitoring solutions.

Sold worldwide, our innovative instrumentation is designed on the basis of your requirements to fit the proper environment, measurement criteria, and budget. Our products could be as easily found in a university laboratory as they could in the deep ocean, along the coast, or in a river, lake, or stream. From the depths of the Pacific Ocean, to the Amazon River, to the small creek in your backyard, there are SonTek/YSI instruments hard at work everyday.

Yellow Springs International large range of water
quality monitoring Instruments

Water is a finite natural resource and its availability is declining in many areas due to climate change and pollution of existing sources. Development of new sources and better management of existing resources is a priority for many countries. YSI can supply the full range of instrumentation to monitor the hydrological cycle.

YSI Hydrodata is a wholly owned subsidiary of YSI Inc, manufacturers of water quality testing and monitoring instruments and systems. YSI water quality meters and multiparameter water quality sondes are market leaders all over the world with a reputation for high levels of accuracy and reliability. YSI's water quality measuring instruments are designed for laboratory and field use - for example, a full range of lab test meters are avialable in addition to hand held water quality testing devices that can also be used for testing streams, rivers, reservoirs, boreholes etc. Thousands of YSI multiparameter water quality sondes are in regular use, either as portable measuring instruments, or in a fixed location recording data to the sondes's own internal datalogger. These sondes can be fitted with a wide variety of water quality, level and flow sensors including DO (dissolved oxygen), pH, temperature, turbidity, EC (conductivity), salinity, ORP, chlorophyll, open-channel flow, velocity, vented level, nitrate-nitrogen, ammonium-nitrogen, ammonia, chloride, rhodamine, depth, light, PAR (photosynthetically active radiation). YSI also builds water quality monitoring systems and wireless networks that record data on internal loggers and transmit the water quality data via satellite, gsm, cellphone, or radio. Alternatively, data collection staff can download readings during routine visits to the water quality monitoring station. Water quality sondes can be mounted in the point of greatest water quality interest, such as close to a discharge, on the river or sea bed, or mounted on a buoy for surface water quality measurements.

YSI SonTek is also a member fo the YSI group and complete the water monitoring portfolio with instruments and systems for measuring water velocity, level and flow. YSI SonTek are recognised as world leaders in water velocity measurement. SonTek invented the Acoustic Doppler Velocimeter in 1993, and now offer a comprehensive range of water monitoring instruments including profilers, current meters, velocimeters, river surveyors and wave guage systems, with applications ranging from water monitoring in the laboratory to small streams, and from rivers and reservoirs to coastal and deep ocean installations.

Sondes to monitor Nitrate, Oxygen, PH levels etc

• YSI Nitrate - water quality monitoring
• PH level meter
• Dissolved Oxygen sensors
• Chlorophyll sensors and analysis
• ADP / ADCP Water Flow meters
  
  and much more. See our Water Quality Monitoring Products listing for full details

Customer Service is key to YSI Environmental's success