PH Sensor TypesAnd Maintenance

overview

Everyone knows that the choice of water quality sensors is very important. In water measurement, the ph sensor is one of the important tools. However, there are many kinds of ph sensors on the market, which makes many consumers wonder “how do I choose the right ph sensor?”, “Where do I start?”. This requires us to know the ph sensor information before using or buying, and then choose the appropriate sensor. In this article, we provide you with the types and applications of pH sensors suitable for different places.

Different types of pH sensor

According to different usage environments, there are many kinds of ph sensors on the market. The correct choice of ph sensors can make your project more effective. On the contrary, choosing the wrong pH sensor will not only lead to inaccurate measurement, but also damage the electrode, leading to an increase in project cost. Different application places, we introduce to you the following 6 most widely used ph sensor electrodes.

1. pH composite sensor

An electrode that combines a pH glass electrode and a reference electrode is called a pH composite sensor. If the outer shell is plastic, it is called a plastic-shell pH composite sensor. If the outer shell is glass, it is called a glass pH composite sensor. The biggest advantage of the composite sensor is that it combines two into one and is easy to use.

2. Desulfurization pH sensor 

Desulfurization pH sensor is used for pH measurement in flue gas desulfurization. The electrode adopts a gel electrode, which is maintenance-free. The electrode can maintain high precision even at high temperature or high pH values. This kind of slurry and desulfurization special PH electrode, because it is flat, it is not easy to scale and easy to clean. Therefore, it is the most suitable electrode for desulfurization. It adopts anti-fouling annular PTFE liquid junction, which is not easy to be blocked and can be tested online for a long time.

3. PTFE pH sensor

The PTFE PH sensor is made of polytetrafluoroethylene, which is resistant to strong acids and alkalis, and is resistant to corrosion. It is suitable for monitoring the pH value in occasions containing organic substances. It uses a low-impedance glass sensitive film, which is wear-resistant, resistant to strong acids and alkalis. The probe is front-facing The ring-mounted protection ring protects the glass bulb with better accuracy and linearity.

4. Electroplating pH sensor

The double liquid junction is adopted to reduce the pollution of the reference liquid. The long-distance reference diffusion path greatly prolongs the service life of the electrode in harsh environments and is convenient for maintenance.

5. pH Glass sensor

The pH value of the solution measured by the glass electrode is the reference electrode of the saturated calomel electrode, the indicator electrode of the glass electrode, and the water sample is measured to form a working battery, and then the pH meter is used to measure the working electromotive force, and the pH meter directly reads the pH value. Value. The pH glass electrode is accurate and rapid for pH measurement, with little interference from water chromaticity, turbidity, colloidal substances, oxidants, reducing agents, salinity and other factors.

Note:

1. The accuracy of the measurement results first depends on the accuracy of the pH standard value of the standard buffer solution.

2, glass electrode and steel electrode should be selected, processed and installed according to the specification.

3. The pH value of water sample should be measured on site, otherwise the sample should be kept at 0-4℃ after sampling, and measured within 6 hours after sampling. Pure water is neutral with a pH of 7.0 at 25 ° C. Solutions below this value are acidic and solutions above this value are basic. Pure water also ionizes (the decomposition process that breaks down charged ions) to produce hydrogen ions.

Article source: https://article-realm.com/article/Health-Fitness/27827-PH-Sensor-TypesAnd-Maintenance.html