Let’s talk about dissolved oxygen (DO); is the amount of gaseous oxygen that is dissolved in water, all aquatic life depends on dissolved oxygen in water, the greatest amount of oxygen is obtained from the atmosphere, there are a variety of factors that influence the concentration of dissolved oxygen in water are: atmospheric pressure, salt content in water and water temperature.
To know the concentration of dissolved oxygen in water, two methods are commonly used: iodometric method and the membrane electrode technique; a high content of dissolved oxygen in water is favorable in a water supply, as this means that the water is better, the levels of DO can vary from 0 – 18 parts per million (ppm), however, when the temperature rises the amount of dissolved oxygen in the water decreases.
That dissolved oxygen is measured
Measurements are usually taken in water using an OD probe or meters; KALSTEIN offers you a line of dissolved oxygen meters, which have conditions and characteristics that allow you to accurately determine the DO in the water; in this way we know the quality of the water, the amount of dissolved oxygen allows us to know the presence of contaminants and bacteria present in the water.
In laboratories it is necessary to obtain a quick value of the DO measurement and for this oxygen meters are used, they allow us to determine the degree of water pollution and the nature of the contaminants, for example, in wastewater control the DO where the low concentration of this parameter is a sign of pollution.
Types of KALSTEIN oxygen meters
- In-line dissolved oxygen controller: it is an economical equipment, has calibration of 1 or 2 points, outputs of 4 to 20 mA, and is suitable for monitoring dissolved oxygen and % saturation in water.
- Table dissolved oxygen meter: professional desktop use, offers a 7-inch TFT screen, stores up to 1000 dataset, configuration menu contains 9 or 17 options, accuracy: 0.2 mg / l, calibration of 1 or 2 points.
How a dissolved oxygen meter works
These devices use waves that detect dissolved oxygen, the waves contain optical fluorescence sensors, galvanic sensors or polarographic sensors; each of them has certain conditions for quality and process control in its different applications.
Now, depending on the probe that has the dissolved oxygen meter we can clarify how it works; let’s see below:
- Optical fluorescence: it is coated with fluorescent properties, the light is exposed to this coating, producing a light and a subsequent glow of fluorescence. The DO level of a sample is measured based on the duration of the glow.
- Galvanic sensor: these probes contain an anode and cathode in an electrolyte; is capable of generating power without external voltage; To obtain the amount of OD, oxygen enters the electrolyte through the membrane, which generates voltage between the anode and the cathode, this potential voltage difference is used to measure the amount of OD.
- Polarographic sensor: these sensors operate similarly to galvanic sensors, with the difference that if they require an external source of energy; the difference in potential voltage between the anode and cathode results in a measurement of the DO.
For the acquisition of dissolved oxygen meters, you can do it through online purchase channels that are easy and viable, in Kalstein we are manufacturers of high level Laboratory Equipment, with great demand for buying and selling worldwide, we also offer you the best specialists to provide you with the necessary advice, we offer you great advantages of guarantee and commitment, ensuring a team with superior technology and high performance HERE
