RESPIRABLE SILICA DUST MONITOR

Dylos uses a Class 1 laser

Patented technology

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Roger Unger - Owner and Chief Engineer at Dylos Corporation

A novel performance to cost ratio

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Custom designed for occupational uses

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Critical differences compared to the other Dylos models

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Longer Battery Life

Standard Dylos models won't last an 8 hour shift.  The Silica Monitor will last over 9 hours.

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Silica Dylos captures a data point every 15 seconds

Notice how the Dylos Silica detected the peak above the orange line (90) and above the grey line (75) at the end.  It also shows a drop below the yellow line (50) and a peak above that we don't see below.

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Standard Dylos captures a data point every minute

The standard Dylos monitor gives data that is not as granular as the Dylos silica.  Notice all the jumps above and below the grey line that the standard model misses and the peak above the orange line is missed.

Granular Graphs

Granular

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Dylos Silica

Not so Granular

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Dylos Standard

Spatial Temporal Information

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What affect does this roadwork have on the surrounding population?

Correction Factors:

The above table contains calculated correction factors for Dylos PM2.5 and Dylos PM10 compared to the respirable silica concentration (NIOSH 7500) and Respirable Dust (NIOSH 0600)

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Sample locations are identified by colors, beige, green, yellow and purple.  This compilation represents a wide variety of concrete chipping side x side analysis including two different Dylos monitors, 4 different locations, 7 different days, 2 types of size-selectors for the NIOSH 0600/7500 sampling.  Sample H1 is from drilling, the rest are from chipping with rivet busters or 60-75lb jackhammers.  Samples H1-H3, beige samples represent the same general location but a different environment with competing dusts each time.


These field calibration results are very good

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We wanted to imitate how the Dylos would be calibrated in real life

Field Calibration

There was some interference with competing dust like sawing metal and wood and diesel exhaust.


The Dylos and the PPI air intakes were not scrupulously positioned.


The tripod was moved around trying to keep it downwind of the action


more to come on this....

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Results at two locations charted

 While a line of best fit needs more data across the expected range of concentrations we can see the linear relationship

A visual representation

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Unlike the PM2.5 levels, the PM10 levels will usually be higher than the respirable silica

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Real-Time, Direct-Read Sensors are Used by Professionals

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AIHAJ, Nov. 1996, Comparison of Respirable Samplers to Direct-Reading Real-Time Aerosol Monitors...

Direct-reading instruments-- "They provide real-time data; they are simpler to use; and in the long run they are less expensive to operate (i.e., do not require the time and expense of weighing individual filters).  For the industrial hygienist, direct-reading instruments should prove to be a valuable asset in evaluating environmental and occupational exposures to aerosols.  They can be used to identify immediate hazards, to screen for prioritization of further air sampling, and eventually may replace traditional gravimetric sampling."  Alex Lehocky and Phillip Williams

iScape, Summary of air quality sensors and recommendations for application, February 2017

This paradigm aims to gather high-resolution spatio-temporal air pollution data by using a ubiquitous network of low-cost sensor nodes for monitoring real-time (or near real-time) concentration of different air pollutants.  Such data can then be utilized for a variety of air pollution management tasks such as: (i) supplementing conventional air pollution monitoring; (ii) improving the link between pollutant exposure and human health; (iii) emergency response management, hazardous leak detection, and source compliance monitoring; and (iv) increasing community's awareness and engagement towards air quality issues.

How Sensors Might Help Define the External Exposome, 2017, Intl.Journal of Envirn. Res. & Pub Health

The concept of assessing location and matching this with environmental data collected from either other instruments or sources is fundamental to exposure science.  Furthermore, sensors may help push the frontier with their potential to allow for collection of detailed location and activity data over a much longer term than typically done in exposure studies.

Calibration and Assessment of Low-Cost Dust Sensors, 2018, Danube Adria Assoc. for Automation & ...

The measurement of PM10 concentration in the air is a very important step towards the solution of the particle pollution problem.  But it's a challenging and generally expensive tasks.  Recently, alternative, low-cost methods were developed.  These methods, if implemented correctly, could open an entirely new field in the air pollution research.

A Comp. of Total, Respirable, and Real-Time Airborne Particulate Sampling in Horse Barns, 2006, Rose

..real-time measurement provides useful features: (a) the results are immediately available on site and do not require laboratory analysis, (b) the time pattern of exposure can be studied, and (c) spatial comparisons between areas of a site or between different sites are readily accomplished.

Long-term eval of air sensor tech under amb. conditions Denver 2018, Atmos. Meas.Tech Feinberg et al

Next-generation air monitoring (NGAM) is a quickly evolving and expanding field.  Low-cost air pollution sensors have improved the access for both citizens and researchers to obtain pollutant concentration data in more locations...Low-cost air pollution sensors have the potential to be important enablers of smart cities and Internet of things (IoT), especially in terms of forecasting and health messaging in megacities with significant variability in microenvironments.