Catharometer, What is it, Price, types, characteristics?

November 2, 2021

The materials used in laboratories are the most varied, from durometers and dosimeters , to katharometer and capacimeters. In this particular case we will focus on the Catarometer, an instrument that is used especially in the area of ​​chromatography.

What is a katharometer?

As we mentioned, an instrument that is used mainly in the area of chromatography is known as a Catarometer . The latter being a way of separating gases or liquids, of more complex compounds. This process is carried out by absorbing the different components of a sample separately.

All this is done with the purpose of finding the concentration of a certain element. If we take this into account, we can say that katharometers are devices used in chromatography, specifically in gases. For this, the difference in thermal conductivity of the gases where the analyte is found is used .

The latter being the content that can be analyzed or that it is desired to know by means of analytical chemistry. Due to this we can say that this laboratory material is of vital importance. Especially because it allows to determine what is the composition of complex gases.

Basically it works to find the elements that are part of a gas and their proportion in the compound. Serving as a thermal conductivity detector , which means that it also measures heat conduction.

Thanks to this tool, we are able to determine which are the compounds of the gas, carrying out a heat conductivity measurement of the same. Which means that the different components of the gas have different masses. That is, the conductivity is also different.

It must be taken into account that the mass of the molecules is determined by the sum of the atoms that compose it. This molecular weight being inversely proportional to its conductivity level.

Characteristics of the katharometer

The characteristics of this laboratory instrument are very varied. To begin with, we can say that they have the capacity of a conductivity detector . Because of this it is suitable for carrying out different types of analysis. Although this will depend on the situations in which they will be employed.

What stands out most about this product is its sensitivity, its linear response , the temperature range and the care it gives to the sample. These are the characteristics that are considered most relevant in this device. In more detail we can say that the characteristics of this instrument correspond;

  • Sensitivity ; Refers to the size of the sample that can be analyzed. In this case, the smaller the sample, the higher the sensitivity.
  • Answer line ; This is basically known as the concentration range of the substance.
  • Temperature range ; In this case we are talking about what is understood from the degree of freezing of water to its evaporation.
  • Sample care ; As its name indicates, the care that this device gives to the sample, to avoid alterations in it.

However, they are not the only characteristics of this instrument, since it has heating coils and two parallel tubes where we can find the gases.

It is important to add that in one tube we find the sample, being the other tube in which the analysis will be carried out. For this, a comparison is carried out in the speeds at which they lose heat in the coil . Thanks to the sensor that this instrument has, metal or a thermistor can be detected.

It is important to add that this instrument is easily transportable. On the other hand, it also stands out for being very easy to use. The latter is reflected in its built-in lcd screen where the information obtained from the sample can be seen in an ashy form.

Parts of the katharometer

Apart from knowing the characteristics of this instrument, we must know what its parts are. To begin with, it has two tubes placed in parallel, filaments, resistance, and conductive holes for both inlet and outlet for the gases.

The last thing we can say is that this laboratory device also has an electronic viewer which can show the result.

What is the katharometer for?

As we have been mentioning, this laboratory instrument works to determine which are the components found in complex gases . That is, it tries to indicate what it is composed of, as well as the proportions of each element in the set.

It is a material usually used in gas chromatography to know what are the elements in the composition of a gas . The same is done for your practical use and to achieve separation of said compounds. Although it can also be for descriptive use, in which the compound and its elements are analyzed.

The use of this instrument is closely related to the area of ​​chromatography, since many gases are analyzed here . Due to this, any of the functions of this instrument can be applied in this matter.

However, leaving this area, the katharometer can also be used in other areas, where it is just as necessary. A clear example is in medicine, where it is used to understand lung function. But also to find abnormalities in the oxygen breathed by the person. It must be borne in mind that the latter can be a clear indication of some serious pathology.

It is important to note that in the area of ​​medicine, the analysis where this element is used will depend considerably on what you want to measure. We must bear in mind that this has different methods of analysis of air and respiration .

To a lesser extent, we can also say that this instrument works in the industrial sector. For this area it is used mainly to find the compounds of the various industrial gases that are found.

How does the katharometer work?

In general terms, we can say that this instrument can be used in a wide variety of areas other than those already mentioned. Regarding its operation we can say that this is quite simple, especially when it comes to reading the results. Remember that this device has an LCD screen where the results are displayed, to make it easier to read.

It must be clear that this is an electrical measuring instrument, which means that it has an electrical power source . It is important to mention that it is attached to a steel setting. Which cover the entire surface of the instrument.

To all this we must add that the katharometer also has two cavities, in which the gases enter. The reference gas enters one of them, while the sample carrier enters the second.

Continuing with its operation we can say that when the gases enter the instrument and collide, they make the detection of thermal conductivity possible. This is achieved due to the fact that they have a resistance or thermal threads , which when the whole process occurs, the gases pass through the amplifier. When they do this, they end up generating the conductivity of the gases we are analyzing.

Types of katharometer

There are many types of katharometers that we can find, which differ mainly by the types of sensors they use. Sensors that have a thermal resistance. Being this resistance the one that is opposed to the heat and its change of temperature that occurs by the gas.

It is important to mention that this type of laboratory device can be made with platinum, gold or tungsten . At the same time we must add that this instrument has a semiconductor thermistor.

We must mention that the difference in metals and in the thermistor is that the latter have a temperature coefficient, so their resistance is affected as the temperature rises. Due to this, many people decide to choose a sensor made with one of the metals already mentioned, because they are much more resistant.

The latter does not mean that those with a thermistor are less efficient. Only its resistance is affected by the increase in temperature . But even so, they are still very useful when doing their work.


To finish with everything mentioned, we can say that the fact of determining the composition of gases is very important. Keep in mind that these will be used later, but this is not all, since before being used they must be categorized.

As we can imagine, the fact of working with gases whose composition and elements it contains is extremely dangerous. If we have all this in mind we can say that this katharometer is a very important device. This is because it allows the elements of a gas to be determined with a good degree of accuracy.

If we take into account its accuracy, ease of use and accessibility, we can say that the Catarometer is a perfect instrument for this use. In fact, the katharometer has positioned itself as the ideal element to carry out this specific function.

Dr. Loony Davis5
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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.

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