mlu-recordum Environmental Monitoring Solutions GmbH

- Model ADS - Additional Sensors



Apart from the already installed modules the airpointer offers capabilities for implementing additional sensors and external instruments using the high performance airpointer data recording. These sensors are integrated via Ethernet, RS-232 or analog interfaces. Additional sensors are mounted outside or inside the airpointer depending on the space available.


The airpointer continuously manages and controls measurement data via a web based user interface. The high-performance airpointer features can be used for each additionally implemented sensor. This includes data recording over a period of several years, data backup and faster data access via the recordum portal, data download for local analyses and more.

Road traffic and public places

  • Noise level
  • Pedestrian counts
  • PM sampling
  • PM monitoring
  • Navigation systems (GPS)
  • UV radiation

 Indoor air quality

  • Carbon monoxide (CO2)
  • Oxygen (O2)
  • Relative humidity
  • Temperature
  • Light intensity

 Industrial hygiene

  • Toxic gases
  • Volatile organic compounds (VOC)

What is Particulate Matter??
PM10 and PM2.5 are not single components but the mass concentration of all ambient air particles with an aerodynamic diameter smaller than 10 µm (PM10) or 2.5 µm (PM2.5).Where does Particulate Matter come from?

Thresholds of these pollutants are frequently exceeded, especially in areas with strong vehicle traffic air pollution. This leads to an increased public awareness of PM issues.
Particulate matter comes from diesel exhaust particles, tire wear, brake dust, and swirling road dust generated by vehicle traffic.

What are the Effects of Particulate Matter?
PM2.5 and PM10 have a short-term effect on the cardiovascular system. Evidence of a direct relation between the number of heart attacks and PM concentration has been substantiated. For instance, a long-term effect of PM pollution is the potential to carry and hold toxic compounds in the respiratory system. Particles in lungs and bronchia weaken the immune system.

Measurement Principle: Nephelometry
The airpointer PM module uses nephelometry, the proven optical method of measurement. A sample heater minimizes the effects of humidity. The module uses a light-scattering photometer with a near-IR LED, a silicon detector hybrid preamplifier and a reference detector. The scattered light is proportional to PM concentration.

Size Selection
A TSP inlet is part of the standard equipment of the PM module. Simply change the optionally available size-selective inlets to measure PM10 or PM2.5

Measured Compound: Particulate Matter

  • EU Directive / USEPA Procedure: Particle collecting and gravimetric analysis
  • Measurement principle: Nephelometry
  • Range: Dynamic, up to 2,500 µg/m³
  • Zero noise
  • Lower detection limit: < 1 μg/m3
  • Zero drift (24 hours): < 1 μg/m3
  • Span drift (24 hours): ±1% of reading
  • Response time: < 60 seconds
  • Precision: 1 μg/m3
  • Linearity
  • Sample flow rate: 2 l/min
  • Weight

The airpointer +PM can be equipped with an approved PM analyzer. Furthermore, you may connect the airpointer to an external PM analyzer by using the available interfaces. Thus you may as well use the airpointer’s advantages especially within data recording and data transfer for measuring PM.

Measurement Principle: Beta Ray Attenuation

Beta ray attenuation is a radiometric measurement. The particles are deposited on a filter belt and exposed to beta radiation. Varying beta absorption during sampling defines the mass of the deposited particles.

Measured Compound: Particulate Matter

  • EU Directive / USEPA Procedure Measurement principle: Particle collecting and gravimetric analysisBeta ray attenuation
  • Radiation source: 14C (Carbon14) 60 µCi ±15 µCi, half-life of 5730 years
  • Range: Dynamic, up to 1.000 mg/m³
  • Lower detection limit (24 hours): < 1 μg/m3
  • Zero drift (24 hours): < 1 μg/m3
  • Resolution: 0.1 µg/ m3
  • Sample flow rate: 16.7 l/min

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