Water Quality Instruments
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Colorimeters determine the concentration of a solute by measuring the light absorption of the solution at a particular wavelength before and after a specific reaction has occurred.
Conductivity / Resistivity / Salinity / TDS Meters
Conductivity measures how easily electric current can pass through a solution and resistivity is how strongly it opposes the flow of electricity. Salinity is the amount of salt dissolved in water and TDS is an abbreviation for total dissolved solids, the measurement of all inorganic and organic substances dissolved in a solution.
DO / COD Meters
DO is the amount of dissolved oxygen. COD is the chemical oxygen demand, frequently used to determine the amount of organic compounds in water by indicating how much oxygen is consumed in the process of converting those compounds into carbon dioxide.
ISE meters use an ion selective electrode to determine the concentration of a specific ion based on its electrical potential.
pH / ORP Meters
The concentration of the hydrogen ion is what determines the pH level, and therefore how acidic or basic the solution is. ORP meters use voltage to measure the solution's tendency to gain or lose electrons; the oxidation reduction potential.
Photometers use the properties of light distribution to test a wide variety of parameters.
Refractometers determine the concentration of an analyte by the angle at which light bends as it passes through the solution.
Titrators determine the concentration of an analyte by reacting a known concentration and volume of an identified analyte with the solution.
Turbidity meters analyze the level of suspended matter in a solution by how much it scatters light thereby reducing the intensity of the light that shines through the solution.