Research Device & New Correlation Data:

This post is in reference to our current Indiegogo campaign. Specifically the last reward tier perk for our "Evaluation Pack" 3x TZOA Research Devices.

6 months ago we had lots of great feedback saying that we needed comparison data against more expensive devices. It’s finally here! This is a test of our TZOA research device (the same sensor that goes into the Enviro-Tracker) against a $3000+ TSI DustTrak DRX.

We saw a R-squared value (correlation) of .7558, which is a great start for us.

This is a granular look at one of the peak events, along with a Dylos as an additional reference point.

How we tested:

In order to do these tests we had to build an enclosed chamber where we could control the environment across multiple sensors. A detailed guide is here:

http://ec.europa.eu/environment/air/quality/legislation/pdf/equivalence.pdf

There is a HEPA filter and a fan (on the right) in order to purify the air inside of the chamber. Conversely, there is synthetic particles known as “Arizona Test Dust” that we aerosolized into the chamber, randomly generated at different concentrations and intervals.

One of the things we need to get better results is building an atomizer to better disperse the particles across all of the sensors.

Moving forward:

Our next step is collecting more data in our test-chamber, and distributing sensors to other organizations to do 3rd party testing in their test-chambers. Real field environmental testing is important to do under a range of different conditions.

Deployment:

We are deploying 10 sensors to India with Michael Brauer, the Professor of Public Health at the University of British Columbia (UBC) and Aaron Birch. They will be studying the effects of air pollution in small huts where wood, dung, and garbage is burned to cook food, and life spans are shortened due to cardiac and respiratory complications. The conditions in India are high pollution concentrations and high humidity. We can compensate for the effects of humidity and temperature on the particles and electronics via the onboard sensors.

Capabilities:

TZOA allows data collection at a tenth of the cost and size of the sensors currently being used. The implication of this is that a large amount of sensors can be purchased and distributed, resulting in higher-resolution studies. Novel studies become possible due to the ‘wearable’ form factor; we can now facilitate large scale personal exposure testing (in this case, proximity of people to the fire is important). Leaving $3000 sensors with randomly chosen individuals in a developing country can also be a barrier.

The research devices we are selling now for September shipment is intended to be 20% smaller than the current prototypes and we will have optional attachment loops for threading a belt or satchel through. Of course, this won’t compare to the portability or our consumer device.

Follow-up:

Please let us know if you have any questions. We are working hard to bring you accurate low-cost particulate air quality sensing and what we need from you is a partnership where data can be collected across various documented studies against reference sensors. This way we can figure out where we perform the best and what needs improvement.

The beautiful thing about our company and our sensor, compared to the off-the-shelf sensors currently available from Asia, is that we have full control over the hardware, software, and firmware. Everyone who works together with us now will be helping share our final product and our next products.

Who wants a go-to choice for low-cost particulate sensing? Let’s make it happen. Contribute now and please share with your networks. Indiegogo has the ability to track your referrals, 3 successful referrals will get you an extra research edition device with your purchase.

Our campaign page can be found here.

More details soon. #seetheair