pH – ORP – Conductivity – Oxygen

Within pH, ORP, conductivity and oxygen, we represent several renowned manufacturers, who are specialized in their markets. The product range extends from very simple solutions to the most advanced.
From our main supplier Knick, we deliver a range of different transmitters, electrodes and sensor housings that can be adapted from the simplest to the most demanding applications.
We can offer automated system solutions including automatic cleaning and calibration of measurement sensors.

pH

A pH sensor is typically used to measure the amount of alkalinity and acidity in water and other liquids. pH sensors are an important tool for ensuring the quality and increasing the safety of a product and the processes taking place in a wastewater or manufacturing facility.
The pH scale is normally based on values from 0-14, and a substance with a pH value of 7 is considered neutral. Solutions with a pH value higher than pH 7 are considered alkaline (bases), while solutions with a pH value lower than pH 7 are defined as acidic (acids). For example, toothpaste usually has a pH value of pH 8-9. Stomach acid, on the other hand, is around pH 1-2.
The difference between an alkaline and an acidic substance is of great importance for a number of processes and companies: cooling towers, boilers, production processes in areas such as food, pharmaceuticals or where ultra-pure water is needed; control of swimming pools and various types of environmental monitoring.

No matter what application you are using it for, a pH sensor will help you maintain the pH at a level that is ideal for your process. This can range from strong acids to basic substances. There are many different types of pH sensors for liquid measurement, including combination pH sensors, laboratory pH sensors, process pH sensors, and differential pH sensors.

ORP

ORP (Oxidation Reduction Potential) measurement is also used in water quality testing and indicates whether one substance can oxidize or reduce another. Positive ORP measurements indicate oxidizing substances and negative measurements indicate reducing substances. ORP sensors consist of two electrodes (reference electrode and ORP electrode) and measure ORP levels based on the electron exchange between the ORP electrode and the solution, while the reference electrode provides a stable baseline for the measurement.
For example, ORP sensors are ideal for determining the level of contamination in water; a high ORP indicates that the water is clean, while a low ORP indicates contamination. ORP sensors are used in various areas such as water treatment, swimming pools and poultry processing. In swimming pools, for example, ORP sensors measure the effectiveness of chlorine against bacteria. Different ORP values reflect different levels of contamination, and higher values mean that the water is sterilized. ORP sensors provide more nuanced information than pH sensors, which contributes to effective water treatment strategies.

Conductivity

Conductivity sensors measure the ability of a solution to conduct electricity based on its ion concentration. The sensors contain electrodes made of, for example, platinum or gold, and work by passing an electric current through the solution and measuring the resulting conductivity. The ion concentration and mobility of the ions determine the conductivity. Conductivity sensors typically consist of two or four electrodes, including a reference and a measuring electrode, and often also have integrated temperature sensors to ensure accuracy, as temperature differences will affect the measurement result. Conductivity is normally measured in milli-siemens per cm (mS/cm) and reflects ion concentrations. Conductivity sensors are used in many industries, from monitoring water quality to assessing chemical solutions and cell health.

Oxygen

There are many types of oxygen sensors that are based on three different operating principles:

1. A change in light intensity and amplitude – light emitted by a fluorescent material when exposed to oxygen. So-called optical oxygen sensor.
2. A change in the wavelength of sound, light, or a magnetic field as oxygen passes through it.
3. Polarographic and galvanic principle, where oxygen penetrates through a membrane and is reduced to hydroxide in an electrolyte solution with anode and cathode.

Oxygen sensors are used in many processes and industries, including biological treatment plants, bioreactors in pharmaceuticals, oxygen level control in beer in breweries, health and medicine, etc.