News — Sampling

How CO2 Gas Flow Affects Measurements

Recently, we set about testing the relationship between the rate at which air is circulated through a wide-range CO2 sensor and the speed and accuracy of the reading. The tests lead to 3 results: 1. Over short periods of time a CO2 sensor is more accurate if the gas is circulated (fan, etc.) around it. 2. Over short periods of time a CO2 sensor with an air-pump pushing gas over it reacts more quickly, and CO2 levels fall off faster than the same sensor dependent on diffusion or a fan for air circulation. 3. Over long periods of time (~18...

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High Speed Sensor Measures End Tidal CO2 for Real Time Capnography

Capnography is the monitoring of carbon dioxide in the respiratory gases. It is increasingly being used by emergency medical personnel and hospitals as a tool to judge the condition of patients. For example, by measuring the end-tidal CO2 (ETCO2, the level of carbon dioxide released at the end of expiration) through a sealed mask, EMS technicians can receive an "early warning" of a patients worsening condition. With accurate and instantaneous CO2 measurements required for Capnography, the COZIR high-speed wide range CO2 sensor seemed like the perfect solution to the problem. However, we wondered if the claimed high-speed of the sensor...

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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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