Carbon dioxide sensor alarm value
The density of carbon dioxide is higher than that of air. The reason is that the concentration of carbonic acid in the blood increases, the acidity increases, and acidosis occurs.
1. Carbon dioxide sensor detection method
Severe atmospheric pollution has caused the continuous emergence and development of technologies,and instruments for measuring gas concentration. These include chemical sensors, ceramic sensors and various types of electrochemical sensors, as well as temperature and humidity recorders for measuring humidity。carbon dioxide transmitters, and so on.
Each sensor is suitable for a certain application field, but it needs to be calibrated frequently and can only work in a clean environment. Traditional CO2 sensors are particularly difficult to measure incombustible gases like CO2. Chemical sensors are difficult to do this job and have a short service life. Various other indirect measurement methods, because they are usually not only sensitive to a gas composition. So its accuracy is very low and the amount of drift is relatively large. Compared with the chemical carbon dioxide sensor, the optical measuring instrument. It has many advantages, but its expensive price also reduces its market competitiveness. However, as the degree of product integration increases, its production costs are also decreasing.
working principle
The working principle of this kind of CO2 sensor is: it adopts a single-beam dual-wavelength non-divergent infrared measurement method, and its uniqueness lies in its filter-a pocket electronic tuning jammer. This filter milling ensures the accuracy and stability of the wavelength of the light it transmits, avoids the problems caused by the mismatch of the filter and the brake and the wear caused by the traditional rotating filter. What this article is going to discuss is one of the optical measurement methods, namely non-divergent infrared measurement.
Various gases absorb light. Different gases absorb light of different wavelengths. For example, CO2 is the most sensitive to infrared light (wavelength is 4.26m). The carbon dioxide analyzer usually sucks the measured gas into a measurement chamber, one end of the measurement chamber is equipped with a light source and the other end is equipped with a filter and a detector. The function of the filter is to only allow light of a certain wavelength to pass through. The detector measures the luminous flux passing through the measurement chamber. The luminous flux received by the detector depends on the concentration of the gas being measured in the environment.
2. Carbon dioxide sensor detection method
There are three main measurement methods based on the principle of non-divergent infrared gas detection: single-beam single-wavelength measurement, dual-beam dual-wavelength measurement, and single-beam dual-wavelength measurement.
Single beam single wavelength measurement, as the name suggests, this CO2 sensor measuring instrument can only provide a single wavelength of light. It has the worst performance among the above three measurement methods, and its stability is extremely susceptible to factors such as lamp aging, dust pollution, and changes in light emission characteristics. Many types of single-beam and single-wavelength measuring instruments currently on the market have unsatisfactory stability. In addition, temperature changes will also affect their stability. But the advantages of this instrument are simple structure, reliable mechanical performance and low price.
Dual-beam dual-wavelength measurement. This combustible gas detection instrument is equipped with 2 optical channels, 1 detector and 2 filters. Compared with the previous instrument, its accuracy and stability are improved, but correspondingly Its price is also higher. In addition, in order for r to increase its operating temperature range, the two detectors must be perfectly matched. In practical applications, the degree of dust pollution on the two lightwave channels will also cause the problem of inaccuracy of accuracy due to asymmetric pollution to this type of measuring instrument.