ph measuring instrument

With the vigorous development of the national economy, the path of industrial development at the expense of the environment is unsustainable, and the government has also strengthened environmental protection requirements and monitoring. This involves many parameters that need to be tested, such as acid-base PH, dissolved oxygen, ORP, etc. So the editor will share with you today on PH. So the question is, what is the PH value? How to detect the PH value? 　　PH: 　　The hydrogen ion concentration index (hydrogen ion concentration) refers to the ratio of the total number of hydrogen ions in the solution to the total amount of substances. It is generally called 'pH'PH' describes the degree of acidity and alkalinity of the aqueous solution, expressed by the pH value. In the thermodynamic standard condition, the aqueous solution with pHu003d7 is neutral, the pH<7 is acidic, and the pH>7 is alkaline.　　The pH range is between 0 and 14, which is only suitable for dilute solutions. The pH of a solution with a hydrogen ion concentration or a hydroxide ion concentration greater than 1mol/L is directly expressed as a concentration. 'Acidity' In chemistry, the acid value (or neutralization value, acid value, acidity) represents the number of milligrams of potassium hydroxide (KOH) required to neutralize 1 gram of a chemical substance. The acid value is a measure of the number of free carboxylic acid groups in a compound (such as a fatty acid) or a mixture. pH is used to indicate the acidity and alkalinity of a solution with a very small concentration of H ([H] is between 1～10-14mol/L), and it is numerically equal to the negative logarithm of the hydrogen ion concentration: pHu003d-lg [H]. This method of indicating the acidity and alkalinity of the solution is particularly convenient for solutions with a small [H]. For example, [H]u003d10-9mol/L alkaline solution, its pHu003d-lg10-9u003d9. 2. pH<7, the solution is acidic. The lower the pH, the greater the acidity and the lower the alkalinity. If ph>7, the solution is alkaline. The greater the pH, the greater the alkalinity and the lower the acidity. pHu003d7, the solution is neutral. When the [H]>1mol/L of the solution, [H] is generally used instead of pH to indicate the acidity and alkalinity of the solution. The pH value of the solution is usually measured with an acid-base indicator and pH test paper. The most accurate method is to use a pH meter. The acidity and alkalinity of the solution can also be expressed by the negative logarithm of [OH-] in the solution, that is, pOHu003d-lg[OH-]. At 25°C, the ion product of water is Kwu003d1×10-14, from which it can be deduced that pHpOHu003d14. The pOH value can be calculated from the pH value. pOH<7 is an alkaline solution, pohu003d7 is a neutral solution, and poh>7 is an acid solution.　　PH scoring experimental and online 　　traditional: According to the needs of production and life, people have scientifically researched and produced many types of acidity meters: 　　according to the measurement accuracy 　　 can be divided into 0.2 level, 0.1 level, 0.01 level or higher accuracy.　　According to the volume of the instrument, there are pen type (mini), portable, desktop, and online continuous monitoring and measurement. According to the requirements of use, the pen type (mini) and portable pH meter are usually brought to the site for testing and use.　　The accuracy level of the pH meter is selected according to the accuracy required for the user's measurement, and then various shapes of pH meters are selected according to the user's convenience.　　On-line: On-line pH tester is a highly intelligent on-line continuous monitor, which consists of a sensor and a secondary meter. It can be equipped with three-composite or two-composite electrodes to meet various applications. Equipped with pure water and ultrapure water electrodes, it is suitable for pH measurement of water with conductivity less than 3μs/cm (such as chemical feed water, saturated steam, condensed water, etc.). Industrial site: After you have a basic concept, you can introduce it to everyone-PH/ORP tester is one of the intelligent online chemical analysis instruments, which is widely used in thermal power, chemical fertilizers, metallurgy, environmental protection, pharmaceuticals, Continuous monitoring of PH value or ORP value and temperature in biochemical, food and tap water solutions. This controller can be used in conjunction with various electrodes. Key parameters and specifications of the acid-base tester: 　　 1. Confirm the use occasion and medium 2. Measure the temperature of the medium 3. Corrosive 4. The specific composition of the medium 5. The installation method 6. The corresponding controller output signal and functional application: Generally in medium and large sewage treatment plants, in the 1990s, some foreign imported brands, such as E+H, Mettler, Hash, etc., were mainly used. With the improvement of domestic industrial water products, some domestic manufacturers Also gradually entered this market. For example, Kaidi has done a good job in environmental protection and has one-stop service, which has been recognized by a large number of customers and peers.

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