Gas analyzer: principle of operation, what to look at when choosing + manufacturer review
Gas analyzer is a device functionally built on the principles of measuring gas mixtures. From the point of view of performance, there are manual and automatic gas analyzers. Handheld analyzers include absorption models that use the technology of absorption of the gaseous medium by reagents.
Devices that operate automatically, usually act on the technology of constructing the physico-chemical characteristics of the substance.
How does the automatic gas analyzer
Practically all gas analysis devices that support automatic measurement, from the point of view of methodology, are conventionally divided into three groups:
- Analyzers of chemical reactions.
- Analyzers of physical and chemical processes.
- Analyzers of physical processes.
The first supported physical methods of analysis performed by chemical reactions.Here, as a rule, the assortment of instruments consists of volumetric-manometric, as well as chemical apparatuses.
With the help of mobile devices measured volume or pressure of the gas mixture.
The second group of devices also supports the physical methodology, but with the addition of a physico-chemical process. Among such processes may occur:
- thermal chemistry;
Naturally, depending on the specific process, the result is obtained in a different way. For example, electrochemistry determines the concentration of a gas mixture, based on its electrical conductivity. Or, by measuring the thermal recoil of the catalytic oxidation reaction, the degree of concentration of combustible gases is obtained.
The third group of gas analyzers, built entirely 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 get a result by measuring the degree of thermal conductivity of substances.
The basic principle of operation and the device of gas analyzers allow the analysis of multicomponent mixtures by measuring the concentration level of one component present in the composition of the mixture.
Principles of classification of gas analyzers
All analyzers currently existing are classified based on structural and technological details. The classification describes the specific functionality of gas analysis instruments: for example, an indicator and a detector may be somewhat similar, but are classified as different meters. The same is true of leak detectors and gas analyzers.
The design classification defines such properties as mobility and portability. The ability of devices to measure a certain number of components is classified by signs of a single-component or multi-component device. Similarly with the number of measurement channels, where there is a classification by single-channel or multi-channel gas analyzers.
Finally, there is another criterion that shows the specific purpose of the instruments. For example, there are gas analyzers for monitoring exhaust gases of automobiles, and there are devices that control technological processes.
The most common devices
The most common devices that make up the three marked groups are highlighted.opticalandelectrochemicaldesigns. Their attractiveness is due to the possibility of making measurements in a state of real-time. At the same time, technologically devices support multicomponent analysis with the possibility of storing the results in a memory chip.
For the industrial sector, such devices are indispensable equipment. Especially where continuous monitoring of emissions or analysis of technological processes is required. In such cases, gas analyzers often act as a system of continuous monitoring of the process of industrial production and are used in environmental studies.
To select for use in a domestic environment, gas analyzers of the specified types are also preferred.
What is important for the choice of analyzer
Trying to make a choice of the device, it is desirable to decide what task will be assigned to the device. Based on the planned tasks, it is easier to find the required equipment. In addition, the money issue with the exact selection of a complete set will be decided in favor of the buyer. The smaller the kit parts, the lower the cost.
The following operating criteria are usually subject to consideration when choosing:
- list of supported gases;
- boundary values of concentration measurements;
- possibility of analyzing the volume and mass fractions;
- continuous work time;
- the ability to conduct measurements at several points.
Of course, external execution plays a certain role in the process of equipment selection. The presence of protective properties, such as waterproof housing, blocking the penetration of dust and soot - all this is also important if you count on the durability of the analyzer.
Considering the saturation of the Russian market with gas analyzers of foreign production, one has to choose with an eye to adapting 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, over time, you can still get used to it.
Any gas analyzer is equipped with working sensors (sensors). As they are used, these elements lose their properties, lose sensitivity and are subject to replacement.How frequent the replacements should be and how things are going with the purchase of spare parts is also a matter of choice that requires a careful approach. Finally, the warranty is not the last part to pay attention to.
Overview of manufacturers of gas analyzers
Among foreign companies whose products have gained popularity in the domestic market, stands outGerman company Testo AG. It produces a wide range of instrumentation, including gas analyzers of various types.
The company has existed for more than half a century and during this period of time has learned to create really high-quality, good-quality equipment in all respects. Specifically, for gas analyzers: Testo AG supplies devices to the market capable of measuring, analyzing, producing characteristics of various flue gases generated by heating equipment.
A worthy choice of gas analyzers is also provided by a domestic company.Polytechform-M. It is one of the major manufacturers of instrumentation and analytical equipment. The enterprise has its own experimental laboratory base, which ensures the successful development of modern devices.
The range of Polytechform-M is represented by models of gas signaling devices from the Signal and Sigma series, including multichannel structures. The company also produces a series of DMG detectors and other equipment. Specific examples include: “Signal-033”, “Sigma 1M”, “DMG-3”.
St. Petersburg companyInformanticsdeveloped and produces a series of devices under the brand name "Hobbit". The Hobbit-T series covers a wide range of substances with which instruments can work and perform analysis.
Virtually all types of gases used in industrial production and the domestic sphere are submitted to analysis using an instrument developed by a company from St. Petersburg. True, "Hobbit-T" - equipment that belongs to the category of stationary devices. This factor limits user choice a little.
Another German company Vössen through its subsidiaryWittdelivers fast, accurate, multifunctional gas analyzers. Moreover, the choice for the consumer is practically not limited by the design of the devices.
The WITT assortment is filled with fixed and mobile devices designed for the production of sampling or flow control. All types of gases are available to analyze with WITT, and the area of possible application begins with the food sector and ends with metallurgy.
Interesting for the selection of marked appliances companyPromekopribor. A relatively young Russian company (2009) develops and promotes modern analytical equipment for environmental purposes in 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 the devices of the "Polar" and "Test" series. These are portable multi-component gas analyzers designed for industrial process control systems.
Convenient household appliances supplies to RussiaItalian 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, the development of “Seitron RGDMETMP1”, a gas detector with natural gas, may be of interest.
This is just one single example of Italian equipment. In general, Seitron equipment can meet the demand in a wide range of needs. Here you can find, for example, mobile gas analyzers for modifying boiler set-ups and stationary gas detectors for rooms.
A gas analyzer is an electronic device that is increasingly becoming a necessary accessory for many moments of modern life. Scientific and technical progress gave 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 mobile model as an example, the principle of operation of a gas analyzer can be understood:
Timely accurate analysis of the environment allows you to protect the nature, to make clean the place of residence of people. Analyzers reveal a complete picture of the state of the surrounding atmosphere, provide an opportunity to assess the situation and immediately take action if there is a departure from the norms.