Portable CO2 Meter Developed for Chilean Market

RYF Technologies recently showed us a prototype for a new portable CO2 + RH/T meter created using our carbon dioxide sensor. It is designed for the Chilean market.

The meter is currently being tested using a COZIR Wide-range sensor with low power requirements especially suited for battery-powered devices. In addition to the sensor, the prototype shown uses a tube cap kit and micro-pump for sample gas drawing, and an Arduino micro-circuit board to display the results in real-time on an LCD screen.

A particularly interesting feature is that CO2 sensor's output is combined in source code with data from a barometric pressure sensor to automatically adjust the CO2 readings at different altitudes. This is critical in South America, where, due to the Andes Mountains, the product must adapt the CO2 level in a large range of altitudes. In the Andes Mountains, the average height is about 4,000 m (13,000 ft). In Chile, the highest mountain peak is Polleras, which rises to 5,993 m (19,662 ft), and some of the highest mountains reach 6,893 m (22,615 ft).

Why is barometric pressure important?

CO2 sensors are calibrated with the assumption that they will take a perfect reading at sea level. The composition of air is unchanged until an elevation of approximately 32,000 feet (10,000m), but the atmospheric pressure of air does change. At high altitudes there’s lower pressure than at sea level. This means that, according to the Ideal Gas Law, the number of molecules per volume unit decreases and will change the readings in a CO2 sensor.

 

Altitude

CO2 Level



0 feet

1000ppm

1000 feet (304m)

964ppm

5000 feet (1524m)

832ppm

10,000 feet (3048m)

688ppm

Read more about the relationship between CO2 levels and altitude here.

Our engineering staff worked closely with RYF from concept to prototype to insure that the product would meet their customer’s requirements.

RYF Technologies is located in Hong Kong, but has found success in recent years developing and marketing products into both China and Chile. We wish them all the best, and were glad to help them move forward on this interesting new product.

 

Posted by CO2 Meter on August 18, 2015.
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