Imagine a handheld, fully portable real-time dust monitor that was capable of the following features. Imagine the endless applications you could use a device of this caliber for. The Fidas Frog from world-renowned German particle instrument manufacturer (Palas) is in a league of its own when it comes to portable dust/particle measurements. No instrument we have ever come across on the market has the measurement range and is as feature-packed as this incredible compact, lightweight instrument.
- Simultaneous PM1, PM2.5, PM4, PM10 and TSP (total PM) particle mass measurements
- Particle counts
- Particle size distribution over 32 particle size channels
- Atmospheric pressure
- Integrated camera for imaging which can be assigned to data records
- GPS (global positioning system)
- 180nm to 100um ultra-wide particle size range (the widest on the market)
- 32 high-resolution particle size channels with 256 raw channels of data
- 0 to 20,000,000 particles per litre particle concentration range
- 0 to 100mg/m3 wide mass measurement range
- The unit is fully portable, with a built-in lithium-ion rechargeable battery and an 8-hour battery life. It can also run off mains power
- Built-in vacuum pump with 1.4 LPM flow rate
- Huge 8 inch 1,280 x 800-pixel color touch screen display
- It’s very reliable at making higher concentration measurements unlike many devices on the market
- The unit can be calibrated by the customer on-site or in the field
- Built-in WI-FI communications for remote data control and data accessing
- USB and Ethernet (by adapter) additional communications
- Built-in camera (optional) for assigning images to measurement data
- Built-in alerting when individual thresholds are reached or exceeded
- Massive 16GB of internal data storage, extendable by micro SD card
- Built-in Windows 10 operating system, you don’t even need a PC to use it
- Advanced reporting capabilities
- Latest generation ultra long-life LED light source technology
- Based on the same sensor and measurement technology and algorithm, this unit has been calibrated against the PALAS FIDAS 200 which is a highly regarded and well-known reference instrument provided by PALAS. The FIDAS 200 is extensively used all around the world and has been approved and certified in Europe to the latest EN 16450 and MCERTS standards
- 20 MHz high-speed digital signal processing
- 13 watt lower power consumption
- Indoor air quality measurements
- Outdoor air quality monitoring
- Occupational health & safety exposure monitoring
- Aerosol research
- Atmospheric research
- Airborne aerosol measurements (planes, drones, balloons)
- Smoke, diesel particulates, silica
- Filter testing
- Powder research
- Many others
The Palas Fidas Frog communicates via WLAN (wireless LAN) with its wireless operator´s control panel (tablet PC). In doing so, it is possible to make measurements on a site and or over great distances and access those measurements remotely on the controlling tablet PC. This concept furthermore allows for the integration of one or more Fidas Frog dust monitors in an existing network and the control of those connected devices from ONE central PC control tablet.
The Fidas Frog is based on widely used and globally recognized optical light scattering measurement technology. It is capable of measuring single particles with very high accuracy and resolution and is equipped with an LED light source with high intensity (DP min = 180 nm), highly stable output, and a very long life expectancy.
The sensor and the evaluation routines within the Fidas Frog is the same technology that is used in the Palas FIDAS 200 higher-level instruments. The Palas FIDAS 200 generation of aerosol spectrometers are highly accurate CERTIFIED PM2.5 and PM10 measurement instruments which have been VALIDATED in comprehensive comparison campaigns when compared to gravimetric reference methods.
The calibration of the instrument can also be checked and adjusted, if necessary, easily and quickly in the field by the end-user with the help of a monodisperse test powder available from Palas. The Fidas Frog operates with a volume flow of 1.4 l/min and is equipped with sensors for monitoring environmental conditions such as temperature, atmospheric pressure, and relative humidity.
Principle of Measurement
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 Figure 2) below.
Fig. 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. 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. 3: Comparison of the algorithms for conversion of the particle size distribution by PM values
Fig. 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 Fig. 3). A mass fraction is obtained by additionally applying the separation curve to the determined particle size distribution. Multiple separation curves can be used simultaneously for the same size distribution, which enables the simultaneous output of PM10, PM2.5, PM1 (and others). For example, the Fidas Frog can be operated with the same conversion algorithm, which has also been implemented in the type-approved and certified ambient air monitoring system Fidas 200 for regulatory monitoring of ambient PM2.5 and PM10 concentrations.
The operation of the Fidas Frog is intuitive and simple. With the operator interface, all measured data can be evaluated and compared directly. Already during the measurement, messages on exceeded limit values are possible. These limit values can be defined either based on legal requirements or on individual needs (see limit values in fig. 4).
Fig. 4: Display of measured values during a measurement
An integrated camera is documenting the measurement set-up. These pictures can be added for documentation directly and in a comfortable way to the measured data set or the measurement report in pdf, generated by the device itself. Fig. 5 shows such a measurement report in pdf including data of the measurement conditions saved by the user and graphical evaluation of the measurement data. Pictures of a workplace measurement have exemplarily been attached to this measurement report as well.
Fig. 5: Example of a measurement report (page 1 and 2)
The measured data can either directly be printed or transferred to a USB-stick via the micro-USB-port and be processed on an external PC. In this case, the evaluation software PDAnalyze Fidas offers various data evaluations especially for the particle size distribution and it offers possibilities for export.