AQ Guard

Palas® introduces AQ Guard Ambient, a measuring device offering reliable and precise information about air quality. Versatile and suitable for a variety of applications in monitoring ambient air quality.
Air quality analyzer for monitoring indoor air quality of fine dust from a particle size of 0.15 µm, measurement of CO2, TVOC, calculation of air quality index and infection risk indicator

AQ Guard, currently the most advanced compact analyzer for determining indoor air quality, continuously and reliably analyses airborne fine dust particles in the range 0.175 – 20 µm (*1 IAHP-Package starting from 0.15 µm). A newly developed mass conversion algorithm calculates PM values based on single particle optical light scattering, considering signal duration and shape.

AQ Guard simultaneously calculates and stores PM1, PM2.5, PM4, and PM10, the total dust load, the particle number concentration CN, and the particle size distribution. Thus, AQ Guard provides comprehensive, accurate information on indoor particulate matter. This is only possible in this form with a counting single particle measurement method.

Operation principle

Your special advantages

  • Technology based on the type approved Fidas® 200 series (EN16450 and MCERTS); simultaneous measurement of CN, PM1, PM2.5, PM4, PM10
  • With the "Indoor Air Hygiene Professional" extension: increased counting efficiency for nano-scaled particles from 0.15 µm
  • Computation of air quality index based on measurements of particulates, CO2, and VOC
  • Estimation of infection risk based on measurements of CO2 and particulate matter
  • High accuracy due to advanced algorithms
  • Long term stable due to self-calibration for measurement of flow rate, particulates, and gaseous pollutants
  • Two years operation without calibration
  • Operates on AC, DC, or power-over-Ethernet

Individual solutions for various industries

  • Industry: production processes, bulk material handling (mixing, discharge, storage, packaging, etc.), fenceline monitoring
  • Construction sites: roads, railroads, demolition sites
  • Buildings: schools, kindergartens, hospitals, hotels, offices, public service buildings,
  • Residential buildings near construction sites or other polluted areas
  • Public transportation: airports, train stations, tramway & underground stations, cruise ships, passenger cabins, e.g., in trams, train
Do you have any further questions?
Please do not hesitate to contact us.
Technical features

In detail

Measuring principle
Optical light scattering at single particles
Reported data
PM1, PM2.5, PM4, PM10, TSP, CN, particle size distribution, ambient pressure, ambient temperature, rel. ambient humidity, CO2, TVOC, Infection Risk Index, Air Quality Index (depending on configuration)
Measurement range (number C_N)
0 – 20,000 particles/cm³
Measurement range (size)
0.175 – 20 µm (with IAHP-Package installed, starting from 0.150 µm)
Measurement range (mass)
0 – 20,000 µg/m³
Measurement uncertainty
R2 > 0.98 for PM2.5 and R2> 0.94 for PM10 versus EN 16450-certified Fidas® 200 (15 min average, each)
Volume flow
1 l/min ≙ 0.06 m³/h
Size channels
64 (32/decade)
USB, Ethernet (LAN), Wi-Fi, optional: 4G
User interface
Touchscreen, 800 • 480 pixel, 5" (12.7 cm)
Data logger storage
10 GB
Data acquisition
Digital, 22 MHz processor, 256 raw data channels
Light source
Long term stable LED
Operating system
Windows 10 IoT Enterprise
Power consumption
< 20 W
Installation conditions
-20 – +50 °C
Response time
1 s, moving average configurable
Aerosol conditioning
Optional: thermal with compact IADS
175 • 280 • 140 mm (H • W • D)
2.4 kg
0.95 – 1.05 (measured against EN 16450 certified Fidas® 200)

More information about AQ Guard

Brief Description

Brief product description in two-pages as PDF

Product Description

Detailed product description as PDF

Palas Brochure AQ Guard

Palas Poster Indoor Measurements

Palas Whitepaper AQ Guard

Shopping cart

Your individual configuration


(Art-No: 6309keine) - AQ Guard

(Art-No: 7290keine) - Indoor Air Hygiene Professional Package


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Total price (net)

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