In order to ensure the accuracy of the detection value, we will calibrate the pH meter before using it. There are generally three calibration methods, let us understand the calibration method of the pH meter together.
pH meter, also called acidity meter, is often used to measure and detect the pH of liquid media, and is currently widely used in industries, agriculture, and environmental protection. If the measured data is inaccurate, it will cause serious consequences to the project or the environment, so the correct use of the pH meter is extremely important. When using PH timing, we need to strictly follow the correct method and sequence in order to obtain more accurate measurement data. So let's take a look at the correct steps and working principle of using a pH meter.
A PH meter is a commonly used instrument. With the development of science and technology, the application scope and technology of PH meter are constantly improving. There are a wide variety of PH meters, and various PH meter products are used to precisely measure the PH value of liquid media, such as industrial production and processing, food testing and other fields.
The pH meter is an important tool for measuring and reacting the pH of the solution, and the pH electrode can realize the function of detecting pH value and output signal by supporting the pH meter. There are various models and products of pH meters. The display mode is also divided into two options: pointer display and digital display. However, no matter how the type of pH meter changes, its working principle is the same. The main body of the pH meter is a precision potentiometer. A pH meter consists of a reference electrode, a glass electrode and itself.
In primary treatment, the suspended solid pollutants in the sewage will be removed, and most physical treatments can only meet the requirements of primary treatment. After the primary treatment, 30% BOD can be removed from the wastewater. It doesn’t meet the emission standard. Primary treatment is a pre treatment of secondary treatment.
In secondary treatment, colloid and dissolved organic pollutants (BOD, COD) in the waste water will be removed, and the removal rate can be higher than 90%. The organic pollutants meet emission standards. Use pH meter to monitor whether the emissions of organic pollutants are up to standard.
In tertiary treatment, non biodegradable organic pollutants, N, P and other soluble inorganic substances that lead to eutrophication of water bodies are further processed. Main methods are biological nitrogen and phosphorus removal method, coagulant sedimentation method, sand filtration method and activated carbon adsorption method.
In industry, the pH meter is used more frequent as a pH measuring and analyzing instrument rather than the pH test paper and standard colour chart. The digital pH meter display screen can accurately show the pH value on real time, the error is greatly increased by one order of magnitude than that of pH test paper. Moreover, it can also realize the automatic control of pH value and pH value alarm. But due to the service life of pH electrodes, it is easy to break down, as a result, users have to pay much money in replace new pH electrodes. Next we will introduce the selection experience of pH electrode in several typical industries, so as to provide reference for users.
A pH meter is an digital instrument used to test and monitor the pH value of a solution. It works by the principle of primary battery, of which the electromotive force between two electrodes is based on the Nernst Law. Electromotive force of primary battery is affected by both property of electrodes and hydrogen ion concentration in the solution. There is a correspondence relationship between the electromotive force and hydrogen ion concentration of the primary battery, namely negative logarithm of the hydrogen ion concentration is equal to the pH value.
