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 more toxic. During algal blooms, photosynthesis increases the water pH, especially in stagnant or slow-moving water.
pH is measured by a sensing electrode for Hydrogen and a reference electrode along with a meter to measure the electrode potential. The YSI pH sensor is a glass bulb filled with a solution of stable pH (usually 7), so the inside of the glass surface experiences constant binding of H+ ions. The outside of the bulb is exposed to a water sample where H+ varies. The resulting differential of H+ creates a potential which is read by the meter versus the stable potential of the reference electrode.
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pH measurement in water.
Dual channel benchtop pH/ORP/ISE instrument
pH/mV single channel benchtop instrument with BNC and two banana plug connectors
pH, mV, Temp Instrument Only
pH or mV (ORP) and Temperature Handheld Instrument. Meter Only.
Two channel benchtop multiparameter instrument
IoLine - 3 in 1 Electrode
pH Temperature Pen Tester
Combination pH and temperature, Plastic, Gel filled, digital, double junction probe, 3 meter cable
Dissolved Oxygen, pH/mV and Temperature Handheld Instrument. Meter Only.
Laboratory instrument for pH, ORP, conductivity and BOD in any combination.
$1,320.00 - $3,055.00