Oxygen meters are devices that use the amount of oxygen that is dissolved in or carried in a fluid, i.e. a multi-capacity instrument for water quality inspection. Typically, these devices use two measurement scales: parts per million (ppm) or saturation percentage (%). Dissolved oxygen meters are used in the field and in laboratories.

This equipment is used to measure and control the oxygen content in the various points of the water circuit of steam boiler installations, in order to avoid corrosion of metals caused by the oxidizing power of oxygen. Among other uses, there is the care of aquatic ecosystems and more, since one of its most important applications is fish farming, where the level of oxygen must be continuously controlled to achieve optimal reproduction and avoid mortality of fish caused by low oxygen levels.

What is dissolved oxygen?

Dissolved Oxygen (DO) is a measure of the amount of oxygen that is distributed in a system. Measurement of dissolved oxygen is key in fermentation and cell culture to ensure optimal conditions for the cell, because low levels of oxygen concentration can affect growth rate, nutrient absorption, cell morphology and metabolism synthesis; this is equivalent to a decrease in the quality of the final product. This is in the field of pharmacology.

How do dissolved oxygen meters work?

Dissolved oxygen meters currently generally use two types of dissolved oxygen sensors: electrochemical and optical. Optical sensors measure under the principle of extinction of fluorescence. A luminophore that is part of the membrane is excited by the light of a blue LED, emitting a red light. The oxygen dissolved in the sample turns off the excitation. In cases where oxygen is not present, the lifespan and signal are the best. Luminescence intensity and lifetime are inversely proportional to the amount of oxygen present. Luminescence duration and intensity are measured with a photodetector and used to calculate the dissolved oxygen concentration.

While electrochemical sensors, they have a thin and permeable membrane that isolates the elements of the water sensor. Oxygen that passes through the membrane is reduced by creating a current that the meter converts into a measurement of the oxygen concentration.

How should a dissolved oxygen meter be used?

Firstly, it is recommended that the equipment be calibrated, once the instrument has been calibrated, it is ready for dissolved oxygen measurements. Then slide the DO/O2 selector to DO. Perform the probe salt % compensation, then the probe altitude compensation is performed. The probe is immersed at a depth of not less than 10 cm in the liquid to be measured so that the probe is influenced by temperature and automatic temperature compensation can be carried out.

To measure the content of dissolved oxygen in any liquid, simply immerse the instrument probe in the solution, ensuring that the contact rate between the liquid and the probe is 0.2-0.3 m/s, and then shaking the probe a little so that the air bubbles leave the probe completely.

What do we offer you in Kalstein?

At Kalstein we are MANUFACTURERS of the highest quality and provide you with an excellent range of dissolved oxygen meters, equipment that will allow you to carry out reliable and accurate oxygen analysis in all measuring ranges from trace to high oxygen concentrations and for all conditions. This time we present you our Dissolved Oxygen Meter table YR01832, equipped with a 7 inch TFT screen, stores up to 1000 data sets, the configuration menu contains 17 options, accuracy: 0.2mg / l. For more information we invite you to take a look HERE