News

CO2 Sensors vs. VOC Sensors for IAQ - What's the Difference?

People sometimes ask about the differences between VOC (Volatile Organic Compounds) sensors and CO2 sensors. While both can be used to measure indoor air quality (IAQ), these sensors are not interchangeable. They measure very different things. CO2 sensing technology by IR (infrared) is stable and is not subject to the short-term, random drift found in air quality sensors. Most IR carbon dioxide sensors only measure CO2. A CO2 sensor is designed to control the ventilation rate in occupied spaces. People are the principal source of CO2 in indoor air. Whereas outside air carbon dioxide levels tend to be relatively low...

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Measuring Gases: Diffusion vs. Sampling Method

Many of you have called us to ask about applications that start with the sentence, “How do I…” In every case, the application falls into one of two groups: measuring gas by diffusion or measuring gas by sampling. Knowing the difference can help you decide which method is best for you. Diffusion – Measurement for Environment From indoor air quality to plant growth to personal safety: all of these involve people and areas where gases are diffused in ambient air. In other words, the sensor measures the gas concentrations diffused around it. Since the sensor is physically in the ambient...

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Results are in: green buildings save green

PNNL report for GSA finds green, federal buildings cost 19 percent less to maintain 

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New pSense Portable CO2 Meter Video on YouTube

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Taiwan Legislature OKs Indoor Air Quality Management Act

The Taiwanese Legislature passed the Indoor Air Quality Management Act Nov. 8, making Taiwan the second country after South Korea to enact such a regulation. Shieh Yan-ru, head of the Environmental Protection Administration’s Department of Air Quality Protection & Noise Control, said the act, part of President Ma Ying-jeou’s environmental protection platform, is a step toward ensuring the health and well-being of the people.  “The passage of this legislation, which is an extension of earlier outdoor air quality regulations, shows that the government is determined to improve the indoor environment for the people,” Shieh said.  The act, which will take...

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