YSI, Inc

Every species on our planet depends on water and oxygen. For aquatic species, adequate dissolved oxygen is of prime importance to their continued survival. Since dissolved oxygen levels are directly related to good water quality, the two are highly interdependent. Many factors can affect DO levels,...

ORP is typically measured to determine the oxidizing or reducing potential of a water sample. It indicates possible contamination, especially by industrial wastewater. ORP can be valuable if the user knows that one component of the sample is primarily responsible for the observed value. For...

PH determines the acid and base characteristics of water. A pH of 7.0 is neutral; values below 7 are acidic and values above 7 are alkaline. Excessively high or low pH levels are often associated with nutrient deficiencies, metal toxicities, or other problems for aquatic life. High pH makes ammonia...

Rhodamine is a red dye which measures the TOT (Time of Travel) for surface and ground water. It indicates how water moves, and is useful for tracing pollutants, studying aeration and dispersion, as well as waste buildup and flushing in estuaries and bays and waste water retention and flushing in...

Ammonium (NH4+) — or its uncharged form ammonia (NH3) — is a form of nitrogen which aquatic plants can absorb and incorporate into proteins, amino acids, and other molecules. High concentrations of ammonium can enhance the growth of algae and aquatic plants. Bacteria can also convert high ammonium...

Hydrocarbon monitoring in water is of growing importance near oil platforms, marinas, shipping channels, mines, and oil-spill affected waters.

The 6600 V2-4 also measures these parameters: dissolved oxygen, turbidity, chlorophyll, and blue-green algae; the V2-2 measures two of the four parameters simultaneously. Additional calculated parameters include total dissolved solids, resistivity, and specific conductance. Utilize YSI's new...

Electrical conductivity is an indicator of water quality. Conductivity data can determine concentration of solutions, detect contaminants and determine the purity of water. YSI conductivity sensor measures conductivity by AC voltage applied to nickel electrodes. These electrodes are placed in a...

Level of water is measured by a vented strain gauge. A differential strain gauge transducer measures pressure with one side of the transducer exposed to the water and the other side vented to the atmosphere. The transducer measures only the pressure exerted by the water column, and does not...

Blue-green algae (BGA) is actually cyanobacteria, and can range in colors from blues, greens, reds, and black. BGA can reduce nitrogen and carbon in water, but can also deplete dissolved oxygen when overabundant. Monitoring BGA is important because they pose a serious threat to water quality,...