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About carbon dioxide sensor selection guide

by:Rika Sensors     2021-11-27
About carbon dioxide sensor selection guide
As an instrument for detecting the concentration of carbon dioxide, carbon dioxide sensors have a wide range of applications in the living environment, plant cultivation, cultural relics, and archives protection. So how to choose the right carbon dioxide sensor?

Contemporary shopping chooses to purchase online, which is not only diverse in variety, but also very convenient. When searching for carbon dioxide sensors on the Internet, you will find that there are many types of carbon dioxide sensors, their shapes are also different, and the prices are also uneven. Many people who buy carbon dioxide sensors are puzzled about it. Why are the prices of the same products different? What is the difference between? So today, let’s talk to you about what should you pay attention to when choosing a carbon dioxide sensor?

1. Price

A saying that people often say, you get what you pay for. But if you choose the carbon dioxide sensor with the thought of 'you should buy expensive, quality can be guaranteed

The price factor is of course an important reference item when choosing a sensor, but the specifics still depend on the application. You can choose within the range of your own product needs, and you don’t need to pursue the so-called 'expensive'.

Second, measuring range

The measuring range of the sensor is also an important indicator when selecting, but if you pursue a large range too much, it is completely unnecessary. There is a difference between the range selection and the price problem, that is, it is suitable for own products.

In the natural environment, the normal content of carbon dioxide in the air is 0.04% (400 ppm), and sometimes reaches 500 ppm in large cities. When there are no people indoors, the carbon dioxide concentration is generally around 500 to 700 ppm.

Generally speaking, when the indoor carbon dioxide content is above 5000ppm, human body functions will be seriously confused, causing people to lose consciousness and confusion. To detect carbon dioxide concentration in a home environment, the sensor range of 0-5000ppm is sufficient. In public places, classrooms and other densely populated environments, it is also ok to select the sensor range of 0-50000ppm~

When selecting, as long as the sensor range It is enough to cover the carbon dioxide concentration under the extreme conditions of the use environment, and there is no need to pursue a large amount of time too much.

Three. Principle

There are two main types of carbon dioxide sensors commonly used in the market, one is solid electrolyte, and the other is infrared. Among them, the principle of solid electrolyte sensor refers to the formation of electromotive force when gas-sensitive materials pass through the gas, and the electromotive force is measured to measure the gas concentration. Due to the high conductivity of this sensor and good selection characteristics, it is widely used. The principle of the infrared carbon dioxide sensor is based on the absorption of CO2 to a specific band of infrared radiation, so that the radiant energy passing through the measurement chamber is weakened, and the degree of weakening depends on the CO2 content in the measured CO2 gas.

Four. Signal output

At present, the sensor signal output methods include serial port, analog quantity, GPRS, Ethernet, WiFi and other signal output methods. Different signal output methods have different installation methods. The signal output should not be simply divided according to the advantages and disadvantages, but depends on the environmental requirements of the design product scheme.

Five. Measurement accuracy

Accuracy has always been an important performance index of the sensor, and it is an important link related to the measurement accuracy of the entire measurement system. The higher the accuracy of the sensor, the more expensive it is. Therefore, the accuracy of the sensor only needs to meet the accuracy requirements of the entire measurement system, and it is not necessary to select too high. In this way, a cheaper and simple carbon dioxide sensor can be selected among many sensors that meet the same measurement purpose.

Six. Warm-up time

Different types of sensors that detect different gases require different warm-up time. Some require a few minutes, and some require a few seconds. The light source and detector in the infrared carbon dioxide sensor need to be energized to reach the state in order to read the accurate value. Preheating is for the stability and accuracy of the sensor, and has nothing to do with poor product performance.

The above is today’s carbon dioxide sensor selection guide, have you learned it~

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