[Stoves] PM measurement with Speck

Wed Jun 10 20:19:48 CDT 2015

Greetings Stovers,

Interesting that they use a heater to move air through the detector rather than a small fan. I am wondering what the temperature of the heater coils are and if they come in contact with the air being tested. Seems a simple process of having a light shine on the particles and at 90 degrees a photocell detector picks up the reflected light. Much like a nephelometer used for turbidity of water. That all seems good to me if I am understanding it correctly. It would be nice if there was a sealed cell with particles that could be snapped into place and used for calibration OR if there was an inlet and outlet where a calibration gas could be pumped through and circulated around. 

regards
Frank 

Frank Shields
franke at cruzio.com

> On Jun 10, 2015, at 1:23 PM, Erin Rasmussen <erin at trmiles.com> wrote:
> 
> From the Speck FAQ  - :-) Erin 
>  
> What sort of technology does the Speck use? 
> The Speck utilizes an inexpensive Syhitech DSM501A dust sensor <http://www.chinaeds.com/zl/20123814144392849_DSM501APDF.pdf> and includes a small fan to increase airflow. We use machine learning to improve accuracy and individually calibrate each unit. The Speck is powered via USB and contains on-board data storage that can hold up to about 2 years worth of data. Each unit is also Wi-Fi enabled, so you can easily upload your data to our online data repository and access your indoor air quality information from anywhere. 
>  
>  <>What is the Speck's accuracy? 
> We calibrated the Speck using Met One 2μm particle counters and found a very strong correlation (r2 of 0.9 or higher) during in-home pollution events such as cooking. We also continue to improve our calibration and quality control processes to improve accuracy and precision. 
>  
>  <>What range of particulate size does the Speck measure? 
> The Speck is maximally sensitive to 0.5 - 3.0 micron particulates in the air. These are the pollution components most responsible for asthma, arrhythmia, cardiovascular disease, COPD, pulmonary disease and many other quality of life issues. Mold spores and some allergens (e.g. pet dander) also often include this size range, and so the Speck will notice when these peak in a home as well. However, the Speck cannot identify what types of particles are in the air; so, it's an indirect form of detection, but can be useful nevertheless. 
>  <>Is the Speck capable of measuring anything other than PM2.5? 
> The Speck reports out temperature and fine particulate levels only. Particulates can be measured inexpensively and reliably, and as you know they are also a very important part of indoor air issues, since they are connected to such a large array of diseases; so, we start here. 
> There are devices that measure CO2 or CO, but do not offer a full picture of air quality; CO is a deadly gas; and CO2 gives you a sense of how stale the air is. VOCs, on the other hand, are important to monitor to gauge air quality, because they are important factors for long-term cancer risk. However, there are no available inexpensive VOC sensors that are reliable long-term. We are still looking, and when we find one we'll certainly make it available. 
>  
>  
> From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Frank Shields
> Sent: Tuesday, June 09, 2015 9:04 PM
> To: Discussion of biomass cooking stoves
> Subject: Re: [Stoves] PM measurement with Speck
>  
> Dear Paul,
>  
> Unless I missed it there is no info regarding as to how it works. 
> Not much to say about it unless we know the science behind the values. 
>  
>  
>  
> Frank Shields
> franke at cruzio.com <mailto:franke at cruzio.com>
>  
>> On Jun 9, 2015, at 8:31 PM, Paul Anderson <psanders at ilstu.edu <mailto:psanders at ilstu.edu>> wrote:
>>  
>> Stovers,
>> 
>> Except for Crispin's accidental "pocket reply", there has been no reply about the Speck equipment for PM measurement.   Is anyone familiar with it?   
>> 
>> I did have one reply (thank you) off-list from James Schoner, my IT specialist who is the Administrator of my     drtlud.com <http://drtlud.com/>   website:   
>> 
>> After reading your post to the Stoves discussion group about Speck, I went to their website and looked at the FAQ (frequently asked questions), and I noticed they have an open source Chrome app for Speck for downloading time-series data to one’s own hard drive for use by one’s own applications or websites.   In other words, if you run this device, we can use (and even modify) the app to integrate Speck data into your own website or app for analyzing, charting, or monitoring as you wish.
>>  
>> Just something to keep in mind if the need ever arises.
>> Original message with link:
>> 
>> Stovers,
>> 
>> Does anyone have any info about the Speck Sensor in relation to PM measurement for HAP, especially regarding cookstoves in developing societies?   Seems like a natural addition to our testing tools and some of you are possibly already using it.   
>> 
>> https://www.specksensor.com/ <https://www.specksensor.com/>
>> 
>> This info from June 2015 Issue (#70) of the Alliance for Green Heat
>> 
>> Focus on Innovation            
>>     
>> Can Speck revolutionize PM monitoring? <http://r20.rs6.net/tn.jsp?f=001iDKUY1OGMky7jCHG5Rmu0b8RQ4dycRo5oxdArCuSPKczB8pezadlpI17Rsm5qgQpFynGxTYi3gk-hs3FM5wGqB9bZAMWiYFOZGYwry8D4OhuviflXpmwB_mk5-v4G9Ble9iacZIt_Z9fOjO9CpShlGvR656435hKQS5n5sSpz-T5wgGwKCpt7Pdxm_ddBzR65dC1JxllXFjs0U24ZHd03Md1TIqoPXAXOilOtn0jQ_0gu5ogoBGtMRy49G97VelMz_py3Ze7l8ePYq4EkO8rvAlxgh6UqxYWxIKYQ2eiu6xvm19oXMdrIfE0qzqBfEcTLgQofuv5KEE=&c=otURnvJIUpxqzpPxKvZ3DzsskYJZuyDdo7a2794seuh6S2KxT7pnzQ==&ch=na7qIZAYeVhXlbHRKvG0JskQz_20hUmtVRKbtcNOTTZn9KfXAypMtQ==> 
>> Speck is a $200 air quality monitor that detects and data logs fine particulate matter in your indoor environment and informs you about trends and changes in particle concentration. We look forward to seeing if Speck shows indoor PM spikes when wood or pellet stoves are in use.
>> I hope we have more responses this time because the topic of PM monitoring should be important.
>> 
>> Paul
>> 
>> Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD  
>> Email:  psanders at ilstu.edu <mailto:psanders at ilstu.edu>   
>> Skype: paultlud      Phone: +1-309-452-7072
>> Website:  www.drtlud.com <http://www.drtlud.com/>
>> On 6/6/2015 2:19 PM, ajheggie at gmail.com <mailto:ajheggie at gmail.com> wrote:
>>> [Default] On Sat, 6 Jun 2015 19:07:19 +0700,Crispin Pemberton-Pigott
>>> <crispinpigott at outlook.com> <mailto:crispinpigott at outlook.com> wrote:
>>>  
>>>>  
>>>> BBM 'Crispin'
>>> BBM?
>>>  
>>> AJH
>>>  
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