Enviro Technology Services Ltd

- Model NH3 - 1710 - Air Pollution Monitoring of Ammonia Analyser



LSE Monitors has developed a robust and cost-effective analyser based on photo acoustics with a quantum cascade laser. The concentration of NH3 in sample air is continuously determined with a detection limit of 0.025 ppm and a time resolution of 2 seconds. Continuous ammonia measurements in ambient air Ammonia (NH3) plays an important role in neutralizing atmospheric acids like sulphuric or nitric acid.

Thereby particulate matter is formed, which has a negative impact on human health and contributes to radiative forcing. Excess of NH3 can result in eutrophication, loss of biodiversity and soil acidification in sensitive ecosystems. This is a problem in a growing fraction on our planet.

  • Very low detection limit (ppb range)
  • No consumables, turnkey instrument
  • Active gas sampling by integrated pump
  • Virtually maintenance-free instrument
  • User-friendly software
  • Large color graphics with touch screen
  • CE certified
  • Two-year warranty

LSE Monitors
LSE Monitors is a joint venture between Sensor Sense BV in Nijmegen and Synspec BV in Groningen, combining knowledge of laser research, electronic design and analyser production.

Concept of measurement
Infrared light produced by a quantum cascade laser is directed through a measurement cell. This cell is continuously flushed with sample gas. An integrated pump sucks ambient air through the monitor. If ammonia is present in the sample gas, the pressure increases as a result of absorption of the laser light. The laser light intensity is modulated at an acoustic frequency of 1600 Hz and the resulting pressure modulation is measured by small microphones. The amplitude is proportional to the ammonia concentration.

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