November 1, 2021

Invented in 1934 by Arnold Beckman, the pH meter is a pH measuring instrument . The initial motivation for creating this was his friend Glenn Joseph, who expressed his difficulty in accurately measuring the acidity of lemon juice. By then, there were already ways to measure pH, but none with exactitude.

In fact the others were more like indicators than meters; making it difficult to have determinations of the pH in a substance with good precision . The first phometers were already portable instruments and not so complicated to use. Although of course, the design has advanced and improved over time, even reaching different types.

What is the Phmetro?

Indeed, the pH meter is a pH meter, but its operation is far from the other somewhat simpler types of pH meters. The meter works by measuring the voltage between two electrodes ; the electrode being an electrical conductor for non-metallic parts. It then proceeds to display the value of the voltage transformed into ph levels.

This procedure is carried out thanks to its composition that consists of two rods with electrodes, one made of calomel and the other of glass. The glass used to make the sensor, that is, the electrode, is a polarizable one to be sensitive to the concentration of hydrogen ions. In this way, one electrode works as a reference while the other changes the charge of the ions that are in the sensor to positive.

This generates a potential difference between both electrodes, which is what makes the pH measurement possible. Keep in mind that pH is the hydrogen potential of a substance ; For this reason, the concentration of hydrogen ions in a sensor and the potential difference that is created as a result of this allows fairly accurate determinations of the pH levels.

What is the Phmetro for?

The pH meter is a pH meter, this being its main function. The pH is the potential of hydrogen that indicates the levels of acidity or alkalinity of a substance and all have levels of pH, which is measured on a scale from 0 to 14. This scale is logarithmic, which indicates that at each point the levels are 10 times higher than in the previous one.

There are advanced parameters that indicate other types of substance values , such as temperature; however, this will depend on the model and is not itself a function of the meter. Some even have the ability to detect pH levels that exceed the commonly known range, although there are few if these higher-level substances exist.

Uses of the Phmetro

The meter has application in many different areas. At the beginning, when it began to be commercialized in the 20th century, its use for the research area was highlighted and it was claimed that it could not only measure the pH but also the oxidation levels. In fact there are currently parameters capable of this.

The oxidation reduction potential (ORP) is measured with a potentiometric technique, that is, using two electrodes, just like the pH measurement. This is so because oxidation indicates a loss of electrons and reduction a gain of electrons. The difference in the measurement technique is that it does not use a glass sensor but a metal one.

This is a functionality attached to the meter thanks to the fact that its design allows, through some modifications, the measurement of these other values ​​that substances have. However, even being exclusively a pH meter, it is frequently used without limiting its investigation.

In the industrial sector, pH meters are widely used , especially in the food area, where the pH of these is measured to verify their quality, verifying that the standard levels are met. Likewise, the agricultural sector, bioanalysts and even for more everyday uses such as measuring the pH of the pool water make use of the pH meter.

How do you use a Phmeter?

The difficulty or ease of using the meter will depend on the type. Mainly of the calibration that must be carried out if required. However, it is not an instrument of complex use because by following a series of simple steps you can use it with precision to obtain your measurements by simply following the following steps:

  • Turn on the meter.
  • Wait a period of time, about half an hour.
  • Remove the electrode from its storage.
  • Pass the electrode through distilled water.
  • Press the calibrate button and wait for it to stop flashing before pressing again.
  • Immerse in a pH 4 solution.
  • Then dip again in distilled water.
  • Now you can proceed to measure your sample.

This procedure is done when the meter is not calibrated and it is also advisable to take into account its instructions, since depending on the model, some procedure may vary. There are phmeters that require special calibration. However, this procedure will help you if you have problems with your meter.

The pH meter has a variety of applications and models; You don’t have to be a professional in the area of ​​chemistry to use it, much less when there are models whose use is quite simple. For example, those used in aquariums to measure the pH of swimming pool water.

Phmeter types

The pH measuring instruments are various and through time they have been innovated more and more in their use and modes, so that today you can count on a great variety when choosing a pH meter. One of the main differences is the size , you can find them portable, desktop and pocket, the latter being the most comfortable and simple.

Another distinguishing factor between the types of meter is the amount of functionalities it has. I mentioned it earlier, with the case of ORP measurement. There are pH meters that effectively measure the ORP and temperature of the substance. These pH meters come in desktop or portable presentations.

There are also phmeters with analog and digital operation and even types that combine both modes. In fact, the variety of models of pH meters give a wide range of possibilities when choosing one. Having from simple models for everyday use to really advanced for professional use.

Phmetro Features

Taking into account that it is a fairly accurate meter, it will probably give you the impression of being an instrument with a complex operation, but the reality is far from that fact. Of course it requires special pieces and knowledge regarding the principles that govern it. But knowing its parts and how they interact with each other is easier than it seems.

The meter is made up of three parts:

  • Ph electrode : It has a very thin glass membrane; made with pH selective glass, creating a selective barrier when it comes into contact with water and exchanges hydrogen + ions with solutions.
  • Temperature compensation element : One of the things that can cause an incorrect pH measurement is the temperature; as it modifies the activity of the ions. To ensure that this does not affect the measurement, this part is used.
  • Ph meter: This part contains the circuits, displays and meters. Also the calibration controls, although this will vary according to the model.

The pH meter is a really useful instrument and knowing its parts will help you to use it in the correct way; in addition to detecting possible operating problems. It is important to remember that although these are the three main parts, they are made up of other elements that allow the full functioning of the meter.

Importance of Phmeter

The pH meter responds to a need that has been presented for a long time, to have an instrument capable of measuring pH with precision . The pH levels of a solution determine many characteristics of the same; and from there its possible utilities. Very high or low pH levels can mean that these substances are hazardous to health.

Knowing the pH levels is therefore a very important procedure and is in fact carried out regularly.

Dr. Loony Davis5
 | Website

Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

Leave a Reply

Your email address will not be published. Required fields are marked *