Tornado Series Long Pathlength Gas Cell

Heatable Long Pathlength Gas Cells | FTIR Gas Testing

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Better value long pathlength gas cell | AtmosTM

Download the free datasheet in 'Documents' below.

Specac’s standard long pathlength gas cell range is now the new Atmos™ series of metal-bodied fixed-pathlength gas cells. They have been optimized using the latest optical modelling tools to give maximum signal-to-noise. 

Model A2.5 A5 A10 A20
Pathlength (m) 2.5 5.0 10 20
Base pathlength (mm) 104 139 250 455
Number of passes 24 36 40 44
Volume (L) 0.27 0.63 2.12 3.68

The Atmos™ range of cells are heatable to 200 °C with the addition of a heating jacket and temperature controller.

Why Atmos™?

  • Optimized optical path for unmatched signal-to-noise
  • Low cell volume for fast gas exchange
  • Ni-coated Al cell bodies for improved thermal transfer from heating jackets. Also holds higher gas pressure than glass.
  • Inert stainless-steel mirror substrates and avoidance of glues to prevent outgassing
  • 125 psi (8.6 bar) maximum cell pressure
  • Retrofittable heating jacket option for up to 200 °C

Flexible specification long pathlength gas cells | Cyclone™ & Tornado™

These cells are available with glass or metal cell bodies and can be set to a range of pathlengths.

Model C2 C5 or
T5
C10 or
T10
C20 or
T20
Pathlength settings (m) 0.5—2.5
in 0.5 m steps
1.0—8.0
in 1.0 m steps
2.1—10.6
in 1.06 m steps
2.0—20.0
in 2.0 m steps
Base pathlength (mm) 125 250 264 500
Number of passes 4—20 4—32 8—40 4—40
Volume (L) 0.19 1.33 2.60 4.30

Cyclone™ versus Tornado™

  • Cyclone™ cells can be supplied with a fitted heating jacket for studies of heated gases up to 200 °C (not available for model C20)
  • An adjustable mirror carriage can be fitted to Cyclone™ cells to enable the user to vary the pathlength throughout the specified range.
  • Tornado™ cells are a stripped back offering, supplied as standard without inlet or outlet tap valves. They are not heatable.

Which pathlength should I choose?

The absorbance of a gas depends on the distance travelled by the IR light beam through the gas sample. The relationship between absorbance, A, concentration, C, and pathlength, L, is given by Beer’s Law:

A = -log10 (I/I0) = a.C.L

Atmospheric concentrations of gases are usually expressed in C.L units of ppm.m – the number of molecules that would be encountered by the infrared beam across a 1.0 m path.

A gas at 0.1 ppm atmospheric concentration will absorb as much IR light over a pathlength of 100 m as would the same gas at 1 ppm over 10 meters or at 10 ppm over 1 meter.

Accordingly, the pathlength of cell should be chosen to give absorbance values within the spectrometer’s linear range for a given concentration. The following table may be taken as a guide:

Gas name formula v (cm-1) ppm.m absorbance
Carbon dioxide CO2 2360 100 0.40
Carbon monoxide CO 2170 100 0.04
Methane CH4 3020 100 0.10
C2 to C6 n-alkanes   2960 100 0.10
Nitrogen dioxide NO2 1630 100 0.15
Nitric oxide NO 1900 100 0.015
Sulfur dioxide SO2 1370 100 0.09
Hydrogen sulfide H2S 1300 1000 0.002
Ammonia NH3 960 100 0.12
Hydrogen chloride HCl 2940 100 0.04
Water H2O 1650 1000 0.20
Vinyl chloride CH2CHCl 950, 900 100 0.06
Acetaldehyde CH3CHO 2750 100 0.015
Benzene C6H6 670 10 0.09
Toluene C6H5CH3 730, 690 100 0.10
Methanol CH3OH 1040 100 0.10
Ethanol CH3CH2OH 1050 100 0.05
Carbonyl sulfide COS 2070 100 0.40
Nitrous oxide N2O 2235 100 0.15
Sulfur hexafluoride SF6 950 10 0.40

Request a free quote for a Long Pathlength Gas Cell

For a Long Pathlength Gas Cell price, contact us for a free quote.

Read More
  • Atmos
  • Cyclone
  • Tornado
  • Documents
Atmos Gas Cell
  • Atmos A2.5 AtmosTM A2.5 FTIR Gas Transmission Cell (2.5m Pathlength) GS24602
  • Atmos A5 AtmosTM A5 FTIR Gas Transmission Cell (5m Pathlength)  GS24605
  • Atmos A10 AtmosTM A10 FTIR Gas Transmission Cell (10m Pathlength) GS24610
  • Atmos A20 AtmosTM A20 FTIR Gas Transmission Cell (20m Pathlength) GS24620
Atmos Heating Jacket
  • A2.5 Heating Jacket Atmos A2.5 Heating Jacket and Controller GS24651
  • A5 Heating Jacket Atmos A5 Heating Jacket and Controller GS24652
  • A10 Heating Jacket Atmos A10 Heating Jacket and Controller GS24653
  • A20 Heating Jacket Atmos A20 Heating Jacket and Controller GS24654
 
Cyclone
  • Cyclone C2 Gas Cell: Glass Body, CaF2 Windows, Adjustable Pathlength Cyclone C2 Gas Cell with Glass Body, CaF2 Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 2.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24102GCAV
  • Cyclone C2 Gas Cell: Glass Body, CaF2 Windows, Fixed Pathlength Cyclone C2 Gas Cell with Glass Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 0.5, 1.0, 1.5, 2.0 or 2.5 meters) (Specify spectrometer for Benchmark Baseplate). GS24102GCFV
  • Cyclone C2 Gas Cell: Glass Body, KBr Windows, Adjustable Pathlength Cyclone C2 Gas Cell with Glass Body, KBr Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 2.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24102GKAV
  • Cyclone C2 Gas Cell: Glass Body, KBr Windows, Fixed Pathlength Cyclone C2 Gas Cell with Glass Body, KBr Windows, Fixed Pathlength and Viton Seals (specify pathlength from 0.5, 1.0, 1.5, 2.0 or 2.5 meters) (Specify spectrometer for Benchmark Baseplate). GS24102GKFV
  • Cyclone C2 Gas Cell: Glass Body, ZnSe Windows, Adjustable Pathlength Cyclone C2 Gas Cell with Glass Body, ZnSe Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 2.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24102GZAV
  • Cyclone C2 Gas Cell: Glass Body, ZnSe Windows, Fixed Pathlength Cyclone C2 Gas Cell with Glass Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 0.5, 1.0, 1.5, 2.0 or 2.5 meters) (Specify spectrometer for Benchmark Baseplate). GS24102GZFV
  • Cyclone C2 Gas Cell: Metal Body, CaF2 Windows, Adjustable Pathlength Cyclone C2 Gas Cell with Metal Body, CaF2 Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 2.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24102MCAV
  • Cyclone C2 Gas Cell: Metal Body, CaF2 Windows, Fixed Pathlength Cyclone C2 Gas Cell with Metal Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 0.5, 1.0, 1.5, 2.0 or 2.5 meters) (Specify spectrometer for Benchmark Baseplate). GS24102MCFV
  • Cyclone C2 Gas Cell: Metal Body, ZnSe Windows, Adjustable Pathlength Cyclone C2 Gas Cell with Metal Body, ZnSe Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 2.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24102MZAV
  • Cyclone C2 Gas Cell: Metal Body, ZnSe Windows, Fixed Pathlength Cyclone C2 Gas Cell with Metal Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 0.5, 1.0, 1.5, 2.0 or 2.5 meters) (Specify spectrometer for Benchmark Baseplate). GS24102MZFV
  • Cyclone C5 Gas Cell: Glass Body, CaF2 Windows, Adjustable Pathlength Cyclone C5 Gas Cell with Glass Body, CaF2 Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 5.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24105GCAV
  • Cyclone C5 Gas Cell: Glass Body, CaF2 Windows, Fixed Pathlength Cyclone C5 Gas Cell with Glass Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24105GCFV
  • Cyclone C5 Gas Cell: Glass Body, KBr Windows, Adjustable Pathlength Cyclone C5 Gas Cell with Glass Body, KBr Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 5.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24105GKAV
  • Cyclone C5 Gas Cell: Glass Body, KBr Windows, Fixed Pathlength Cyclone C5 Gas Cell with Glass Body, KBr Windows, Fixed Pathlength and Viton Seals (specify pathlength from 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24105GKFV
  • Cyclone C5 Gas Cell: Glass Body, ZnSe Windows, Adjustable Pathlength Cyclone C5 Gas Cell with Glass Body, ZnSe Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 5.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24105GZAV
  • Cyclone C5 Gas Cell: Glass Body, ZnSe Windows, Fixed Pathlength Cyclone C5 Gas Cell with Glass Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24105GZFV
  • Cyclone C5 Gas Cell: Metal Body, CaF2 Windows, Adjustable Pathlength Cyclone C5 Gas Cell with Metal Body, CaF2 Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 5.0 meters) (Specify spectrometer for Benchmark Baseplate) GS24105MCAV
  • Cyclone C5 Gas Cell: Metal Body, CaF2 Windows, Fixed Pathlength Cyclone C5 Gas Cell with Metal Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 meters) (Specify spectrometer for Benchmark Baseplate) GS24105MCFV
  • Cyclone C5 Gas Cell: Metal Body, ZnSe Windows, Adjustable Pathlength Cyclone C5 Gas Cell with Metal Body, ZnSe Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 5.0 meters) (Specify spectrometer for Benchmark Baseplate) GS24105MZAV
  • Cyclone C5 Gas Cell: Metal Body, ZnSe Windows, Fixed Pathlength Cyclone C5 Gas Cell with Metal Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 meters) (Specify spectrometer for Benchmark Baseplate) GS24105MZFV
  • Cyclone C10 Gas Cell: Glass Body, CaF2 Windows, Adjustable Pathlength Cyclone C10 Gas Cell with Glass Body, CaF2 Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 10.6 meters) (Specify spectrometer for Benchmark Baseplate) GS24110GCAV
  • Cyclone C10 Gas Cell: Glass Body, CaF2 Windows, Fixed Pathlength Cyclone C10 Gas Cell with Glass Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.4, 9.5 and 10.6 meters) (Specify spectrometer for Benchmark Baseplate) GS24110GCFV
  • Cyclone C10 Gas Cell: Glass Body, KBr Windows, Adjustable Pathlength Cyclone C10 Gas Cell with Glass Body, KBr Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 10.6 meters) (Specify spectrometer for Benchmark Baseplate) GS24110GKAV
  • Cyclone C10 Gas Cell: Glass Body, KBr Windows, Fixed Pathlength Cyclone C10 Gas Cell with Glass Body, KBr Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.4, 9.5 and 10.6 meters) (Specify spectrometer for Benchmark Baseplate) GS24110GKFV
  • Cyclone C10 Gas Cell: Glass Body, ZnSe Windows, Adjustable Pathlength Cyclone C10 Gas Cell with Glass Body, ZnSe Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 10.6 meters) (Specify spectrometer for Benchmark Baseplate) GS24110GZAV
  • Cyclone C10 Gas Cell: Glass Body, ZnSe Windows, Fixed Pathlength Cyclone C10 Gas Cell with Glass Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.4, 9.5 and 10.6 meters) (Specify spectrometer for Benchmark Baseplate) GS24110GZFV
  • Cyclone C10 Gas Cell: Metal Body, CaF2 Windows, Adjustable Pathlength Cyclone C10 Gas Cell with Metal Body, CaF2 Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 10.6 meters) (Specify spectrometer for Benchmark Baseplate) GS24110MCAV
  • Cyclone C10 Gas Cell: Metal Body, CaF2 Windows, Fixed Pathlength Cyclone C10 Gas Cell with Metal Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.4, 9.5 and 10.6 meters) (Specify spectrometer for Benchmark Baseplate) GS24110MCFV
  • Cyclone C10 Gas Cell: Metal Body, ZnSe Windows, Adjustable Pathlength Cyclone C10 Gas Cell with Metal Body, ZnSe Windows, Adjustable Pathlength and Viton Seals (supplied with pathlength set at 10.6 meters) (Specify spectrometer for Benchmark Baseplate) GS24110MZAV
  • Cyclone C10 Gas Cell: Metal Body, ZnSe Windows, Fixed Pathlength Cyclone C10 Gas Cell with Metal Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.4, 9.5 and 10.6 meters) (Specify spectrometer for Benchmark Baseplate) GS24110MZFV
  • Cyclone C10 Gas Cell gold mirrors on fixed mirror carriage frame assembly Cyclone C10 Gas Cell gold mirrors on fixed mirror carriage frame assembly complete (specify mirror pathlength setting on the frame from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.5, 9.5 or 10.6 meter options) GS24152-C10
Cyclone Heating Jacket
  • Heating Jacket + Temperature Controller for Cyclone C2 Gas Cell Heating Jacket and temperature controller for the Cyclone C2 Gas Cell (specify country). GS24302
  • Heating Jacket + Temperature Controller for Cyclone C5 Gas Cell Heating Jacket and temperature controller for the Cyclone C5 Gas Cell (specify country). GS24305
  • Heating Jacket + temperature controller for the Cyclone C10 gas cell GS24310
 
Tornado T5
  • Tornado T5 Gas Cell: Glass Body, CaF2 Windows Tornado T5 Gas Cell with Glass Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24205GCFV
  • Tornado T5 Gas Cell: Glass Body, ZnSe Windows Tornado T5 Gas Cell with Glass Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24205GZFV
  • Tornado T5 Gas Cell: Metal Body, CaF2 Windows Tornado T5 Gas Cell with Metal Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24205MCFV
  • Tornado T5 Gas Cell: Glass Body, KBr Windows Tornado T5 Gas Cell with Glass Body, KBr Windows, Fixed Pathlength and Viton Seals (specify pathlength from 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24205GKFV
  • Tornado T5 Gas Cell: Metal Body, ZnSe Windows Tornado T5 Gas Cell with Metal Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24205MZFV
  • Tornado T10 Gas Cell: Glass Body, CaF2 Windows Tornado T10 Gas Cell with Glass Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.4, 9.5 and 10.6 meters) (Specify spectrometer for Benchmark Baseplate). GS24210GCFV
  • Tornado T10 Gas Cell: Glass Body, KBr Windows Tornado T10 Gas Cell with Glass Body, KBr Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.4, 9.5 and 10.6 meters) (Specify spectrometer for Benchmark Baseplate). GS24210GKFV
  • Tornado T10 Gas Cell: Glass Body, ZnSe Windows Tornado T10 Gas Cell with Glass Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.4, 9.5 and 10.6 meters) (Specify spectrometer for Benchmark Baseplate). GS24210GZFV
  • Tornado T10 Gas Cell: Metal Body, CaF2 Windows Tornado T10 Gas Cell with Metal Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.4, 9.5 and 10.6 meters) (Specify spectrometer for Benchmark Baseplate). GS24210MCFV
  • Tornado T10 Gas Cell: Metal Body, ZnSe Windows Tornado T10 Gas Cell with Metal Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.1, 3.2, 4.2, 5.3, 6.3, 7.4, 8.4, 9.5 and 10.6 meters) (Specify spectrometer for Benchmark Baseplate). GS24210MZFV
  • Tornado T20 Gas Cell: Glass Body, CaF2 Windows Tornado T20 Gas Cell with Glass Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0 and 20.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24220GCFV
  • Tornado T20 Gas Cell: Glass Body, KBr Windows Tornado T20 Gas Cell with Glass Body, KBr Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0 and 20.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24220GKFV
  • Tornado T20 Gas Cell: Glass Body, ZnSe Windows Tornado T20 Gas Cell with Glass Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0 and 20.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24220GZFV
  • Tornado T20 Gas Cell: Metal Body, CaF2 Windows Tornado T20 Gas Cell with Metal Body, CaF2 Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0 and 20.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24220MCFV
  • Tornado T20 Gas Cell: Metal Body, ZnSe Windows Tornado T20 Gas Cell with Metal Body, ZnSe Windows, Fixed Pathlength and Viton Seals (specify pathlength from 2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0 and 20.0 meters) (Specify spectrometer for Benchmark Baseplate). GS24220MZFV
 
Data Sheets
  • Tornado Gas Cell Range

    Specac Liquid Process Cells are designed for the optical sampling of industrial process fluids in transmission mode using optical fiber interfaces.
  • Atmos Gas Cell Datasheet (7.5 MB)

    The Atmos Gas Cell is a new, smaller, durable FTIR Gas Cell that is perfect for various gas transmission analysis applications.
User Manuals

Features

  • Wide pathlength range (1m - 20m)
  • Vacuum to 15 p.s.i. operation
  • Ambient temperature operation
  • Borosilicate glass body
  • Anodised components
  • Gold mirrors (protected)
  • Viton or Kalrez 'O' ring seals
  • KBr, CaF2 or ZnSe windows
  • Purgeable transfer optics box
  • Benchmark series baseplate mounting
  • Optional Features

  • Additional mirror carriage assemblies
  • Vacuum / gas inlet & outlet taps
  • Pressure gauge
  • Desiccant storage caps
  • Purge bellows