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Particulate matter sensors became widespread not only because these are key components of commercial air quality monitoring stations, but also because these are built into devices that actively filter particulate matter from the ambient air. As such, by detecting and measuring the quantity, we are able to take actions in controlling our exposure to low quality air. The exposure to these particles is hazardous as it can promote various types of respiratory deseases. From the cars that we drive every day, to the operation of the heavy industries, passing by most types of activities in between, the smoke emissions that result, translate into tiny (micrometer size) particles that become suspended in the air. Industrial activity and the lifestyle of the majority of us leads to an impact in the quality of the air that surrounds us. The cost is the environmental impact that not only affects the planet and what surrounds us, but our health and life quality. Progress comes to a cost, and in modern days unfortunately we are paying that debt. According to the manufacturer datasheet these are the materials that compose the sensor: Like other sensors in the MQ series, it is based on a tin dioxide semiconductor that once heated, becomes sensitive to the CO gas. While the most common sensors may be sensitive at detecting small emissions of the gases of interest, they will also pickup different types of gases without being able to distinguish between these.įor detecting Carbon Monoxide, I have selected the very common MQ-7 sensor. One of the challenges of detecting these gases, is the selectivity of the sensor device. A lean concentration of about 8% methane could produce a violent explosion in the presence of a source of ignition.Īs such I did a research on the different types of sensors available in the market, and analysed the more mainstream ones, for their capabilities. The main purpose of detecting methane is therefore because of its flammability.
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So, the bottom line is that asphyxiation is the least of the worries regarding this gas.
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To put this into perspective, this concentration is so high (50%) that is well above its upper flammability limit (UFL), which is 15%. Monitoring it could also be important to perform, not so much for its toxicity (compared to the 400 ppm of the CO gas, it takes about 500 000 ppm of CH4 concentration for it to actually be harmful to the human organism - this happens mostly due to the oxygen displacement that it causes, than because of direct impact with the metabolism). Theoretically the exposure to 400 ppm of this gas for at least 3 hours may prove fatal to an average human.Īnother gas that can occur at home is methane, commonly referred to as natural gas (CH4). Once absorbed by the organism, the CO gas restricts the blood's ability to carry oxygen, depriving the cells of the body from this fundamental substance to its functioning.Īs such, one of my main priorities was to add the ability to detect this gas, as a undetected ventilation problem in the water heater exhaust could easily promote build-up in the kitchen, originating an invisible danger to its occupants.Īlso, it doesn't take a very high concentration of CO gas, for it to be harmful or even life threatening to an individual. Also its effects are difficult to anticipate by the subject, as in a high concentration environment, one may lose consciousness before having time to react.
How to calculate ppm from mq4 how to#
See more: iphone sdk sensor detect, usb voltage detect, detect voltage android, voltage to ppm conversion formula, mq7 sensor module, mq7 arduino ppm, getting right ppm from mq sensors, mq 7 gas sensor wikipedia, mq 6 sensor pin diagram, mq6 gas sensor arduino code, mq4 gas sensor working, android detect usb voltage, drupal 6 to drupal 7, how to get value in visual basic 6 input box, freelancer de musica para bh nos dias 6 e 7 de setembro 2015, freelancer rebirth 7.6, freelancer rebirth 7.6 карта, freelancer rebirth 7.The worst thing about this gas, is that in spite of its high toxicity, our fenomenal nose is totally unable to sense its presence. i need some conversion for it.įor example i need 35ppm of CO, how do i know what is the voltage that is equivalent (between 0-5 V) that is equivalent to 35ppm But the problem i do not know what is the equivalent value since sensor detects in voltage (0-5 V). I want to detect a certain range of CO and LP gas but it is in ppm.