Lab pH Instruments

pH and Conductivity Measuring Solutions for Laboratory and Field Applications

Electrochemistry systems provide accurate measurements of pH, conductivity, ion concentration, ORP/redox and dissolved oxygen for laboratory and field applications. Pair our meter with one of our high-quality sensors, calibration solutions, and analytical software to complete your measuring solution.

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FAQs

What is an electrochemical measurement?

Electrochemistry is the study of chemical reactions that take place in a solution involving electron transfers between the electrode and the electrolyte. Electrochemical measurements include:

  • pH
  • Conductivity (Cond)
  • Oxidation reduction potential (ORP or Redox)
  • Ion concentration (ISE)
  • Dissolved oxygen (DO)

 

What is pH?

pH is a scale used to specify the acidity or alkalinity of aqueous solutions. The pH value correlates with the concentration (to be more precise: with activity) of hydrogen ions. Solutions with a pH less than 7 are acidic (high concentration of hydrogen ions) and solutions with a pH greater than 7 are basic (low concentration of hydrogen ions).

 

Why and where are pH measuring systems used?

pH is measured to:

  • Produce products with defined properties
  • Produce products at reduced costs
  • Ensure the quality of products, in order to avoid damage to people, materials and the environment
  • Fulfill regulatory requirements
  • Protect equipment
  • To gain knowledge for research and development


Lab pH instruments are used in various industries such as:

  • Pharma and biotech
  • Dairy
  • Soils and sewage treatment
  • Cosmetics
  • Water filtration
  • Food and beverages


Additionally, pH instruments are needed for applications outside of the laboratory. This includes locations near or at industrial production and in the field (for measuring water, sewage, soil ,etc.).

 

What does a pH measuring system consist of?

The tools necessary for pH measurements are relatively uncomplicated and provide reliable measurements when used correctly. A typical lab pH instrument consists of the following:

  • pH meter: A potentiometer that measures the voltage difference between a glass electrode and a reference electrode and calculates the pH value.
  • Sensors: A reference and a pH electrode for completing the circuit. Nowadays they can be combined, and are called combined pH electrodes.


Other tools required are:

  • Calibration solutions: Before measuring the pH of a sample, two or more reference solutions of known pH values must be used for the calibration of a pH electrode.
  • Sample: The sample is the solution to be measured, which needs to be an aqueous solution or contain enough water for the pH measurement to be possible.
 
 
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