Powerful Cavity Ring-Down Environmental Gas Analyzer
Environmental Molecular Contaminant Monitor Tiger-i series

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Environmental Molecular Contaminant Monitor Tiger-i series Environmental Molecular Contaminant Monitor Tiger-i series


Based on Cavity Ring-Down Spectroscopy (CRDS), TigerOptics Tiger-i series can measure the sub-ppb level of gas species with absolute accuracy, proven reliability, and fast response in one compact and easy-to-use device.


  • Environmental gas monitoring
  • Airborne Molecular Contaminants (AMCs)
  • Continuous Emission Monitoring (CEM)


  • Fast, absolute measurement technique, using Cavity Ring-Down Spectroscopy (CRDS)
  • Drift-free, with calibration traceable to the world’s leading reference labs
  • Lowest Cost of Ownership – maintenance-free
  • Best-in-class sensitivity and extraordinarily wide dynamic range
  • Analyte: HCl, HF, NH3, CH4, CO, CO2, CH2O, HCN, etc.
  • Ethernet, isolated 4-20 mA and RS-232 connectivity

Cavity Ring-Down Spectroscopy(CRDS)

  1. 1.A Continuous Wave (CW) diode laser emits a directed beam of light energy through an ultra-high reflective mirror into the absorption cell (cavity).
  2. 2.The light reflects back and forth between two ultra-high reflective mirrors multiple times, up to a total path length of 100 kilometers.
  3. 3.Once the photodiode detector “sees” a preset level of light energy, the light source is shuttered or diverted from the cavity.
  4. 4.On each successive pass, a small amount of light or ring-down signal emits through the second mirror and is sensed by the light detector.
  5. 5.Once the light "rings down", the detector achieves a point of zero light energy in milliseconds, and the measurement is complete.

Fig 1. Ring-Down Cavity Cell


Fig 2. Ring-Down Time


Operating range See table below
Detection limit (LDL, 24 h peak-to-peak variation) See table below
Sensitivity (3σ) See table below
Precision (1σ, greater of) ± 0.75 % or 1/3 of Sensitivity
Accuracy (greater of) ± 4 % or 1/2 of LDL
Speed of response See table below
Environmental conditions 10 ℃~40 ℃
30 %~80 % RH (non-condensing)
Storage temperature -10 ℃ − 50 ℃

Gas Handling System and Conditions※

Gas connections 1/4” male VCR inlet and outlet
Leak tested to 1×10-9 mbar l / sec
Inlet pressure 0~10 psig (HCl and HF) 0~15 psig (all others)
Outlet pressure Vacuum (<10 Torr)
Flow rate ~1 slpm
Sample gases Ambient air, dry air (CDA) or N2
Gas temperature Up to 60 ℃

※Vacuum source with >2 slpm @ 10 Torr required

Dimensions and Weight

Standard sensor, H×W×D [in (mm)] 8.75×8.5×23.6 (222×216×599)
Sensor rack, H×W×D [in (mm)] 8.75×19×23.6 (222×483×599) (fits up to two sensors)
Weight, Standard sensor 33 lbs (15 kg)


Alarm indicators 2 user programmable, 1 system fault, Form C relays
Power requirements 90~240 VAC, 50/60 Hz
Power consumption 40 Watts max.
Signal output Isolated 4−20 mA per sensor
User interfaces 5.7” LCD touchscreen, 10/100 Base-T Ethernet, 802.11g Wireless (optional), RS-232

Environmental Molecular Contaminant Monitor Tiger-i series

Model/Analyte Range LDL Sensitivity Speed of response
Tiger-i 2000 HCl/HCl in ambient air 0~4 ppm 1.0 ppb 0.75 ppb 2 min to 80 %
Tiger-i 2000 HF/HF in ambient air 0~1 ppm 0.2 ppb 0.15 ppb 2 min to 80 %
Tiger-i 2000 NH3/NH3 in ambient air 0~40 ppm 8 ppb 6 ppb 3 min to 95 %
Tiger-i 2000 CH4/CH4 in ambient air 0~20 ppm 2 ppb 1.5 ppb 3 min to 95 %
Tiger-i 2000 CO2/CO2 in ambient air 0~3000 ppm 200 ppb 150 ppb 3 min to 95 %
Tiger-i 2000 CH2O/CH2O in ambient air 0~200 ppm 100 ppb 75 ppb 3 min to 95 %
Tiger-i CEM H2S/H2S in ambient air 0~500 ppm 50 ppb 38 ppb 3 min to 95 %
Tiger-i CEM CO/CO in ambient air 0~2000 ppm 100 ppb 75 ppb 3 min to 95 %
Tiger-i CEM HCN/HCN in ambient air 0~15 ppm 1.5 ppb 1.1 ppb 3 min to 95 %

※Please contact us for additional analytes and matrices.


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