Gas analyzer: principle of work, what to look at when choosing + manufacturers review
The device, functionally built on the principles of measuring gas mixtures, allows you to timely determine the excess of dangerous toxins. Gas analyzer - a small-sized device will warn of the danger associated with the unauthorized release of harmful volatile substances and the occurrence of leaks in the pipeline.
We will talk about all types of gas mixture analyzers used in practice. In the article we presented, their design features and the principle of operation are described in detail. Based on our recommendations, you can choose the most suitable device.
The content of the article:
How does an automatic gas analyzer work?
In terms of performance, there are manual and automatic gas analyzers. Hand-held analyzers include absorption models that use technology for absorbing a gaseous medium with reagents. Devices that operate automatically usually operate according to the technology for constructing the physicochemical characteristics of a substance.
Almost all gas analysis devices supporting automatic measurement, from the point of view of methodology, are conditionally divided into three groups:
- Chemical reaction analyzers.
- Analyzers of physical and chemical processes.
- Analyzers of physical processes.
The first to support physical analysis methods are chemical reactions. Here, as a rule, the range of devices is volumetric-manometric, as well as chemical devices.
Mobile devices measure the volume or pressure of a gas mixture.
The second group of devices also supports the physical methodology, but when supplemented by a physicochemical process.
Among these processes may be:
- thermal chemistry;
Naturally, depending on the specific process, the result is obtained in a different way. For example, the concentration of a gas mixture is determined by electrochemistry based on its electrical conductivity. Or, by measuring the thermal yield of the catalytic oxidation reaction, a degree of concentration of combustible gases is obtained.
The third group of gas analyzers, built solely on a physical technique, is represented by magnetic, optical, densimetric and other devices. This group includes, for example, thermoconductometric devices for analyzing gas mixtures, due to which they obtain a result by measuring the degree of thermal conductivity of substances.
The basic principle of operation and the arrangement of gas analyzers allows the analysis of multicomponent mixtures, measuring the concentration level of one component present in the mixture.
Classification principles for gas analyzers
All existing analyzing devices are classified based on structural and technological details. The classification characterizes the specific functionality of gas analysis devices.
For example, the indicator and the signaling device may be somewhat similar, but are classified as different meters. The same goes for leak detectors and gas analyzers.
The design classification defines properties such as mobility and portability. The ability of devices to measure a certain number of components is classified by the characteristics of a single-component or multi-component device.
Similarly, with the number of measurement channels, where there is a classification for single-channel or multi-channel gas analyzers.
Finally, there is another criterion showing the specific purpose of the devices. For example, there are gas analyzers for monitoring automobile exhaust gases, and there are devices that control technological processes.
The most common appliances
The most common devices that make up the three marked groups are optical and electrochemical models. Their attractiveness is due to the possibility of making measurements in real time.
At the same time, technologically devices support multicomponent analysis with the ability to save the results in a memory chip.
For the industrial sector, such devices are indispensable equipment. Especially where continuous emission control or process analysis is required.
In such cases, gas analyzers often act as continuous monitoring systems for the industrial production process, and are used in environmental studies. To select for use in a domestic environment, gas analyzers of these types are also preferred.
The choice of instrument for gas analysis
Trying to make a choice of a device, it is advisable to decide which task will be assigned to the device. Based on the intended tasks, it is easier to find the required equipment. In addition, the monetary issue with the exact selection of equipment will be decided in favor of the buyer. The fewer kit parts, the lower the cost.
When choosing, the following working criteria are usually subject to attention:
- list of supported gases;
- boundary values for measuring concentrations;
- analysis of volume and mass fractions;
- continuous operation time;
- the ability to take measurements at several points at once.
Of course, external performance plays a role in the process of equipment selection. The presence of protective properties, such as a waterproof housing, blocking the penetration of dust and soot - all this is also important when counting on the durability of the analyzer.
Given the saturation of the Russian market with foreign-made gas analyzers, you have to choose with an eye to adaptation to domestic conditions. It is clear that if the information part of the device is in a foreign language, it is more difficult to use such a device. True, you can get used to it over time.
Any gas analyzer is equipped with working sensors (sensors). As they operate, these elements lose their properties, lose their sensitivity and must be replaced.
How frequent replacement should be and how things are with the purchase of spare parts is also a matter of choice, requiring a careful approach. And the warranty period is not the last detail to which you should pay attention.
Overview of gas analyzer manufacturers
Among foreign companies whose products have gained popularity in the domestic market, the German company Testo AG stands out. It produces the widest range of instrumentation, including gas analyzers of various kinds.
The company has existed for more than half a century, and over this period of time has learned to create really high-quality, solid technology in all respects.
Specifically for gas analyzers: Testo AG supplies devices to the market that can measure, analyze, and provide the characteristics of various flue gases generated heating equipment.
A quite worthy choice of gas analyzers is also provided by the domestic company Polytechform-M. This is one of the major manufacturers of instrumentation and analytical technology. The enterprise has its own experimental laboratory base, which ensures the successful development of modern devices.
The assortment of Polytechform-M is represented by models of gas detectors from the Signal and Sigma series, including multi-channel designs. The company also produces a series of DMG detectors and other equipment. Among specific examples, it can be noted: “Signal-033”, “Sigma 1M”, “DMG-3”.
St. Petersburg company Informanalitika has developed and produces a series of devices under the brand name "The Hobbit". The Hobbit-T series covers a wide range of substances with which devices can work and perform analysis.
Almost all types of gases used in industrial production and the domestic sphere are analyzed using an instrument developed by a company from St. Petersburg. True, Hobbit-T is equipment that belongs to the category of stationary devices. This factor somewhat limits user choice.
Another German company, Fössen, through its subsidiary WITT, supplies fast, accurate, multi-functional gas analyzers. Moreover, the choice for the consumer is practically unlimited in the design of devices.
The WITT range is filled with stationary and mobile devices designed for the production of selective or in-line control. All types of gases can be analyzed using WITT technology, and the field of possible application begins with the food industry and ends with metallurgy.
Interesting choices are made by Promekopribor devices. A relatively young Russian company (2009) develops and promotes modern analytical technology for environmental purposes on the domestic market.
It is noteworthy that the products manufactured by the company fully comply with the regulatory documentation for domestic use. The list of products of the company is headed by devices of the Polar and Test series. These are portable multicomponent gas analyzers designed for industrial process control systems.
Easy-to-use household appliances are delivered to Russia by the Italian company Seitron s.r.l. Italians have been working on the Russian market for more than 15 years, and during this time they managed to supply more than 450 items of instrumentation.
For the domestic sphere, for example, the development of “Seitron RGDMETMP1”, a gas contamination detector supplied by natural gas, can be of interest. main gas pipeline.
This is just one single example of Italian equipment. In general, Seitron technology is able to cover demand in a wide range of needs. Here you can find, for example, mobile gas analyzers of operational adjustment of gas and solid fuel boilers and stationary gas contamination detectors.
A gas analyzer is an electronic device that is increasingly becoming a necessary accessory for many aspects of modern life. Scientific and technological progress has given people a lot of useful things and products, but at the same time brought a lot of harmful production technologies and operating conditions.
Conclusions and useful video on the topic
Using the example of a mobile model, we can understand the principle of operation of a gas analyzer:
An accurate analysis of the environment allows you to protect nature, to make clean the place of residence of people. The analyzers fully reveal the state of the atmosphere, provide an opportunity to assess the situation and take immediate action if there are deviations from standardized norms.
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