Electrochemical Meters

pH meter

A pH meter is an instrument used to measure hydrogen ion activity in solutions - in other words, this instrument measures acidity/alkalinity of a solution.

• Test principle: The pH measurements are made by comparing the pH reading of a sample solution to that of a reference solution with defined pH, such as buffers.
• pH levers: Neutral solution: pH = 7, Acidic solution: pH < 7, Basic solution: pH > 7.
• Applications: pH meter is an essential component of science, and it has a big impact on our lives. It can be used in but not limited to the following industries: food & beverage, pharmaceutical, oil & gas, agriculture, water treatment.

ISE meter

An ion selective electrode (ISE) meter is an instrument used to determine the activity of ions in aqueous solution by measuring the electrical potential.

• Test principle: At equilibrium, there is potential difference existing between two sides of the ion selective membrane. The relationship between potential difference and ion concentration can be determined by measuring the potential of two solutions of already-known ion concentration and a plot based on the measured potential and logarithm of the ion concentration.
• Applications: ISE meter has a wide variety of applications. For example, ISE meter finds its use in pollution monitoring in natural waters (CN-, F-, Cl-, etc.), food processing (NO3-, NO2- in meat preservatives), Ca2+ in dairy products, and K+ in fruit juices, etc.

EC meter

An electrical conductivity (EC) meter measures the electrical conductivity in a solution.

• Test principle: It is calculated by the ability of a substance to transmit an electrical current over a defined area.
• Applications: EC meter can be used in but not limited to the following aspects: natural waters, aquaculture, water treatment, agriculture, and environmental applications.

DO meter

A dissolved oxygen (DO) meter basically measures the concentration of oxygen in water.

• Test principle: DO meter works by measuring the amount of oxygen that diffuses through a permeable (or semi-permeable) membrane into the probe (sensor). Once the oxygen enters the sensor, a chemical reduction reaction occurs, producing an electrical signal which can be read by the DO probe and displayed on the meter.
• Applications: DO meter is mostly used in groundwater remediation, wastewater, aquariums, and fish hatcheries.