Telecommunications University has released how to distinguish the poor CO2 sensor.Many inexpensive products react to disinfecting alcohol

Many of the inexpensive carbon dioxide concentration measuring instruments (CO2 sensors), which are less than 5,000 yen or less (CO2 sensor) sold on the EC site on August 10, have not measured the CO2 concentration and are disinfected.We have announced the results of the survey that uses a pseudo sensor that responds to.

The number of people working at home is increasing due to the corona evil, but there are many devices in the market that measure carbon dioxide concentration as a guide for ventilation to prevent three denses.However, it is difficult for humans to directly experience carbon dioxide concentration, and it is difficult for ordinary people to confirm whether the sensor is working correctly.For this reason, the research team purchased a total of 12 models, a CO2 sensor of 2900 to 4999 yen sold on the EC site for infection measures, and actually verified accuracy.

As a result, one of the 12 models was considered to be a failure due to abnormal values, and eight models did not respond to CO2.The remaining three models have low accuracy, despite their low accuracy, and are judged to be available for proofreading for infection measures.In addition, eight models that did not respond to CO2 show a strong reaction to the alcohol for disinfecting, and used a pseudo sensor that responds to miscellaneous gases such as alcohol and general volatile compounds, despite the CO2 sensor.It is highly likely to be.

In addition, many UV removal and sterilization goods have been available regarding corona countermeasures, but there is also a survey that Engagett writer Miyazato has almost no effect.

If you look at these results, you are worried whether the CO2 sensor used at home is correct, but there are also ways to check it easily.

First, put a sensor in the outdoor air, and check if the CO2 concentration is around 400 ppm (340 to 460 ppm for a guide).If the number is large, it is not suitable for a ventilation monitor.However, depending on the model, there is something that can proofread the measured value, so it seems good to check the instruction manual.

The second is to breathe in the sensor and make sure that the CO2 concentration rises to the measurement limit.The exhalation contains carbon dioxide, so if you blow it directly, it should react.At this time, if the sensor does not respond immediately, put a sensor in a plastic bag, etc., and inflate the bag with a breath and see how it looks.If the sensor still does not respond, we recommend that you do not use it as a ventilation monitor.

Third, the hand with disinfecting alcohol is approached to the sensor and confirm that the CO2 concentration does not increase.If it rises significantly, it is likely that a pseudo sensor that responds to other gas is used instead of CO2.

There are some cheap but proper products, but unfortunately it is difficult to determine before purchasing.If you buy it, you will need to make efforts such as choosing a trusted manufacturer or scrutinizing reviews, not just for cheapness.

Source: Electro -Telecommunications University