The nitrogen dioxide (NO₂) violet laser diode based sensor for ambient, airborne and vehicle mounted measurements from TDL Sensors Ltd. 

Features

  NO₂ direct cavity-enhanced absorption measurement at 404 nm

  Detection limit of 1 ppbv for a time constant of 1 s (0.2 ppbv for a time constant of 80 s)

  Absolute measurements

  Self-calibration

  No OZONE generator required

  No NO₂ to NO converter required

  No exhaust scrubber required

  No mechanical modulators required

  Rugged and reliable

  Low operating cost

Typical raw cavity output intensity and phase shift signals observed when sampling laboratory air at a flow rate of 500 sccm, a laser modulation frequency of 60 kHz, a lock-in amplifier time constant of 1 s. An average NO₂ concentration in the laboratory air was 24 ± 1 ppbv.(48 ± 2 mg m^–3). Signal spikes were due to flow change between laboratory air and chemically scrubbed air.

Applications

  Air quality monitoring

  Ambient nitrogen dioxide monitoring across cities

  Research of NO₂ reactions with other species

Ordering Options

RS232, RS485, 4-20mA
Alarm relays
19" rack mountable version
GPRS modem or Ethernet

Combustion Control

Quantum Cascade Laser
 New! Systems  

Stack Monitoring/CEMS

Hazardous Area Monitoring     

Trace Gas Analysers 

Multipass Optical cells 

New! OEM components 

Custom Instruments

Contract R&D