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Palas - Fidas® mobile Fine Dust Monitor System


The Fidas® mobile is designed to be a portable, hand-held, battery-operated device that can also be plugged into the power supply It simultaneously measures PM1, PM2.5, PM4, PM10, and TSP environmental mass fractions or respirable, thoracic, and inhalable mass fractions as per DIN EN 481. In addition, it measures the particle number and particle size distribution (upon request) in up to 64 size classes within the particle size range of 0.18 – 18 μm or 0.4 – 40 μm. The time resolution can be adjusted from one second to hourly or daily mean values for continuous measurements.

A filter holder was intentionally omitted from this model. Based on the WHO air quality guideline of 50 μg/m3 for PM10 as a daily average limit for ambient air with a volume flow of 1.4 L/min, a 48-hour measurement would have to be carried out in order to gather a concentration of 200 μg on the filter (two times the detection limit of a 100-μg laboratory scale), with the sampling time extended accordingly in the case of half the average concentration.

The Fidas® mobile is equipped with a data logger with 4 GB Compact Flash storage and WLAN support. The firmware supports complete remote access with remote maintenance and optional data storage at www.palas.de/user. In addition, the Fidas® mobile can be equipped with additional sensors for environmental conditions, temperature, atmospheric pressure, and relative humidity.

The Fidas® mobile can be connected to an isokinetic sampling probe that measures emissions in exhaust air ducts.

Principle of measurement

The Fidas® mobile measures aerosol particles based on Lorenz-Mie scattered light analysis of single particles. The single particles move through an optically differentiated measurement volume (see Fig. 1) that is homogeneously illuminated with polychromatic light.

The patented T-stop provides a precisely defined optical measurement volume and enables particle measurement without border-zone errors, resulting in a precise size measurement. The new, digitized, electronic signal analysis system enables the rapid identification and correction of coincidence, as necessary.

Fig. 1: Schematic diagram of scattered light detection with the patented T-stop

Each particle generates a scattered light impulse that is detected at an angle of 85° to 95° degrees. The particle number is measured based on the number of scattered light impulses. The level of the scattered light impulse is a measure of the particle size diameter.

Using a polychromatic light source enables a precise and unambiguous calibration curve to be obtained, resulting in an extremely high size resolution (see Fig. 2).

Fig. 2: Scattered light intensity of a white light source compared with a monochromatic light source (angle 85° – 95°, respectively; m = 1.59 + 0i)

The measured light intensities are classified to a particle diameter and combined into a histogram (corresponding to the size classes) using this unambiguous calibration curve.

In order to convert the measured particle size distribution into a mass or mass fraction, the distribution in each value is multiplied by a correlation factor that reflects the different sources (e.g. combustion aerosols, tire wear, pollen) of the environmental aerosol (see Fig. 3). A mass fraction is obtained by additionally applying the separation curve (see DIN EN 481) to the determined particle size distribution.

Fig. 3: Comparison of the algorithms for conversion of the particle size distribution by PM values

Multiple separation curves can be used simultaneously for the same size distribution, which enables the simultaneous output of PM10, PM2.5, PM1 (and others).

Operation

Based on continuous customer feedback, the user interface and software have been optimized for intuitive operation and real-time control of measurement data and parameters (see Fig. 4).

Fig. 4: Standard data screen and graphic display measurement on the integrated touch screen

In addition, the software provides data management with the integrated data logger, sophisticated export capabilities, and network support. The measured data are able to be displayed and evaluated with many available options. If a specific display is desired, we can implement it for you.

Fig. 5: Typical use of the Fidas® mobile for indoor air quality measurements

 

Particular Advantages

  • Online display of dust values and particle size distribution
  • Counting measurement method, optimal resolution
  • Real-time measurement
  • Light source: LED
  • Up to four hours of measurement time in battery mode
  • Fidas® data analyzer software for individual analysis of your measurement data on an external PC
  • Low maintenance
  • Easy to operate
  • Reliable function
  • Cloud zone via Palas server for worldwide data retrieval
  • Reduces your operating expenses

 

    


 

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Palas - Fidas® 300 S Fine Dust Monitor System


The Fidas® 300 S is additionally equipped with sensors to determine wind direction, wind speed, precipitation levels and precipitation type.

 

Particular Advantages

  • Counting measurement method
  • Time resolution > 1 s
  • Real-time measurement
  • Light source: LED
  • Long service life
  • Low maintenance
  • Easy to operate
  • Cloud zone via Palas server for worldwide data retrieval
  • Reliable function
  • Reduces your operating expenses

 

    


 

 

 

Palas - Fidas® 200 S Fine Dust Monitor System


The Fidas® 200 S has successfully passed suitability testing for continuous and simultaneous immission measurement of the PM10 and PM2.5 fractions in airborne particulate matter as per VDI 4202-1, VDI 4203-3, DIN EN 12341 (PM10), DIN EN 14907 (PM2.5) and has met the equivalency guidelines and received certification as per DIN EN 15267-1 and -2. The suitability testing results will be published in the German Federal Gazette and the certificates will be issued at www.qal1.de in early 2014.

The Fidas® 200 S is currently the only optical immission system for online and simultaneous measurement of PM2.5 and PM10 on single particles (counting measurement method).

The Fidas® 200 S fine dust monitoring and immission measurement system enables the continuous and simultaneous measurement of PM1, PM2.5, PM4, PM10, TSP (PMtot), as well as particle number concentration and particle size. It is incorporated into an IP65 weather-proof housing. As a result, the Fidas® 200 S is able to be operated as a completely independent, stand-alone device for outdoor measurements, e.g. on the Zugspitze (Germany's highest mountain) or on the North Sea coast.

The Fidas® 200 S uses the recognized measurement technology of optical light scattering of single particles and is equipped with an LED light source with highly stable output and long lifetime. It is also equipped with a filter holder for the insertion of an absolute filter (47 or 50 mm in diameter). This enables a subsequent chemical analysis of the composition of the aerosol, for example, or an on-site gravimetric validation.

The Fidas® 200 S functions with a volume flow of 0.3 m3/h and is equipped with a Sigma-2 sampling head as per VDI 2119, which enables representative measurements even under strong wind conditions. The sampling system includes a drying system (intelligent aerosol drying system – IADS) that prevents measurement inaccuracies caused by condensation effects resulting from high humidity. In addition, a weather station provides reliable results for temperature, atmospheric pressure, and relative humidity.

Palas® offers remote maintenance and online data access for the Fidas® measurement systems at www.palas.de/de/user.

Design and function

Figure 1 presents the design of the Fidas® 200 S fine dust measurement system. It comprises a Sigma-2 sampling head that enables representative measurements even under strong wind conditions and an intelligent aerosol drying system (IADS) that uses a drying unit that is dynamically controlled in relation to relative humidity and outside temperature in order to prevent measurement inaccuracies caused by condensation effects resulting from high humidity.

Figure 1: Design of the Fidas® 200 S fine dust measurement system

The actual aerosol sensor is an optical aerosol spectrometer that determines the particle size using Lorenz-Mie scattered light analysis of single particles. The single particles move through an optically differentiated measurement volume that is homogeneously illuminated with polychromatic light. Each particle generates a scattered light impulse that is detected at an angle of 85° to 95° degrees. The particle number is measured based on the number of scattered light impulses. The amplitude of the scattered light impulse is a measure of the particle size diameter.

The lower detection limit for immission measurement was able to be reduced to 180 nm through improved optics, higher light density using a new white LED as the light source, and improved signal analysis (logarithmic analog digital converter). This enables greatly improved detection, especially of smaller particles, which are mainly found at high concentrations near roadsides (see Figure 2).

Figure 2: Higher sensitivity with the Fidas® fine dust measurement system for the 0.18 – 18 μm particle size range

The better the classification accuracy and the resolution capacity, the more accurate the definition of the particle size distribution.

The new, digitized, electronic signal analysis system enables the rapid identification and correction of coincidence, as necessary. Multiple separation curves can be used simultaneously for the same size distribution, which enables the simultaneous output of PM10, PM2.5, PM1 (and others).

Figure 3: Comparison of the algorithms for conversion of the particle size distribution by PM values

In order to convert the measured values into a mass or mass fraction, the high-resolution particle size distribution in each value is multiplied by a correlation factor that reflects the different sources (e.g. combustion aerosols, tire wear, pollen) of the environmental aerosol (see Figure 3).

Figure 4: PM10 reference equivalence function of the Fidas® 200 S in comparison with a reference small-filter device during the course of suitability testing from the "Report concerning the suitability testing of the PM10 and PM2.5airborne particulate matter components on the FidasR 200 S immission measurement system manufactured by PALAS GmbH, TUV report no.: 936/21218896/A".

* Additional, non-certified measurement ranges, e.g. 0.4 – 40 μm and 2 – 100 μm, available upon request.

 

Particular Advantages

  • Certified in accordance with DIN EN 15267-1 and -2
  • Continuous and simultaneous real-time measurement of multiple PM values
  • Additional information on the basis of particle number concentration
  • High data availability (> 99% in TUV suitability test)
  • Adjustable time resolution starting at 1 minute
  • Light source: LED with high stability and long lifetime
  • Remote maintenance and data retrieval
  • Integrated data logger for data backup (even in the event of power failure)
  • Long service life
  • 2 pumps operating in parallel for additional reliability in terms of data availability
  • Little maintenance required, on-site size calibration possible
  • Intuitive, easy operation
  • Reliable functioning
  • No radioactive material
  • No consumables
  • Reduces your operating expenses!

 

    


 

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Palas - Fidas® 300 Fine Dust Monitor System


Various versions of the Fidas® system are available to provide an economical solution for reliable indoor/outdoor quality (IDQ/ODQ) measurements, depending on the application.

All Fidas® 300 systems are equipped with an LED light source for high light stability and long lifetime and a filter holder for the insertion of an absolute filter. This also enables a subsequent chemical analysis of the composition of the aerosol, for example.

The Fidas® 300 functions with a high volume flow of 2.3 m3/h and is housed in an IP65 weather?proof housing. The Fidas® 300 is equipped with a PM2.5 sampling head as per EN 14907 and a PM10 sampling head as per EN 12341.

The device includes an intelligent aerosol drying system (IADS) and a sensor for temperature, atmospheric pressure, and relative humidity. The IADS prevents measurement inaccuracies caused by condensation effects resulting from high humidity.

Palas® offers remote maintenance and online data access for the device at www.palas.de/user. The Fidas® functions within the particle size range of 0.25 – 17 μm for PM measurements.

 

Particular Advantages

  • Counting measurement method
  • Time resolution > 1 s
  • Real-time measurement
  • Light source: LED
  • Long service life
  • Low maintenance
  • Easy to operate
  • Cloud zone via Palas server for worldwide data retrieval
  • Reliable function
  • Reduces your operating expenses

 

    


 

 

 

Palas - Fidas® 200 Fine Dust Monitor System


The Fidas® 200 is a fine dust measurement system for ambient air quality measurements for regulatory purposes. This version is typically incorporated into an existing measurement container.

The Fidas® 200 S fine dust monitoring and immission measurement system enables the continuous and simultaneous measurement of PM1, PM2.5, PM4, PM10, TSP (PMtot), and the particle number concentration.

The Fidas® 200 system uses the recognized measurement technology of optical light scattering of single particles and is equipped with an LED light source with highly stable output and long lifetime. It is also equipped with a filter holder for the insertion of an absolute filter (47 or 50 mm in diameter). This enables a subsequent chemical analysis of the composition of the aerosol, for example.

The Fidas® 200 functions with a high volume flow of 0.3 m3/h and is equipped with a Sigma-2 sampling head as per VDI 2119-4, which enables representative measurements even under strong wind conditions. The sampling system includes a drying system (intelligent aerosol drying system – IADS) that prevents measurement inaccuracies caused by condensation effects resulting from high humidity. In addition, a weather station provides reliable results for temperature, atmospheric pressure, and relative humidity.

In addition to the high time-resolution measurement data, the device can also be equipped with a standardized measuring head for PM2.5 or PM10 (Leckel PMX-PNK). The measurement data can be gravimetrically validated on site by weighing the filter.

Palas® offers remote maintenance and online data access for the Fidas® measurement system at www.palas.de/user.

(*) Suitability and equivalency testing is currently ongoing.

Design and function

The actual aerosol sensor is an optical aerosol spectrometer that determines the particle size using Lorenz-Mie scattered light analysis of single particles. The single particles move through an optically differentiated measurement volume that is homogeneously illuminated with white light. Each particle generates a scattered light impulse that is detected at an angle of 85° to 95° degrees. The particle number is measured based on the number of scattered light impulses. The level of the scattered light impulse is a measure of the particle size diameter.

The lower detection limit for immission measurement was able to be reduced to 180 nm through improved optics, higher light density using a new white LED as the light source, and improved signal analysis (logarithmic analog digital converter). This enables greatly improved detection, especially of smaller particles, which are mainly found at high concentrations near roadsides (see Fig. 1).

Fig. 1: Higher sensitivity with the Fidas® fine dust measurement system for the 0.18 – 18 μm particle size range

The better the classification accuracy and the resolution capacity, the more accurate the definition of the particle size distribution.

Using a white light source enables a precise and unambiguous calibration curve to be obtained, resulting in an extremely high size resolution. The patented T-stop provides a precisely defined optical measurement volume and enables particle measurement without border-zone errors, resulting in a precise size measurement. The new digitized electronic signal analysis system enables the rapid identification and correction of coincidence, as necessary.

Fig. 2: Comparison of the algorithms for conversion of the particle size distribution by PM values

In order to convert the measured values into a mass or mass fraction, the high-resolution particle size distribution in each value is multiplied by a correlation factor that reflects the different sources (e.g. combustion aerosols, tire wear, pollen) of the environmental aerosol (see Fig. 2). A mass fraction is obtained by additionally applying the separation curve (see DIN EN 481) to the determined particle size distribution. Exact matches with gravimetric results cannot be guaranteed in every case due to the different principle of measurement (equivalence measurement method)

Multiple separation curves can be used simultaneously for the same size distribution, which enables the simultaneous output of PM10, PM2.5, PM1 (and others).

Fig. 3: Comparison of the 1-h measurement values for PM2.5 and PM10 between the Fidas® 200 S and a TEOM FDMS during a measurement campaign in a northern German city from August to November 2010

A filter holder is located downstream from the optical sensor to provide the option for a gravimetric validation of the measurement data.

 

Particular Advantages

  • Continuous and simultaneous real-time measurement of multiple PM values
  • Additional information based on particle number concentration
  • Adjustable time resolution starting at 1 minute
  • Light source: LED with high stability and long lifetime
  • Long service life
  • Low maintenance, possible to verify calibration on site
  • Intuitive and easy to operate
  • Reliable function
  • Cloud zone via Palas server for worldwide data retrieval
  • No radioactive material
  • No consumables
  • Reduces your operating expenses

 

    


 

Downloads

 
 

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