Cyclone | Heatable Long Pathlength Gas Cell
This is a Labware Analytical(LA) Product, If you wish to enquiry or order, please fill in the online form or email to info@labware.com.hk.
The cyclone™ is a standard heatable long pathlength gas cell accessory designed with Borosilicate glass body and gold mirrors which are protected. They have been optimized using the latest optical modelling tools to give maximum signal-to-noise.
Key Features:
- Configurable long pathlength There are made to a specified pathlength within the ranges described below. Each of the four bodies permits a different range and has a different internal volume.
- Adjustable mirror There is adjustable mirror carriage which can be fitted to Cyclone™ cells to enable the user to vary the pathlength throughout the specified range.
- Optional heating jacket Can be supplied with a fitted heating jacket for studies of heated gases up to 200 °C (not available for model C20)
Specifications
Features
- Wide pathlength range (1m - 10m)
- 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
Flexible specification long pathlength gas cells | Cyclone™ 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 |
| 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 |
| Base pathlength (mm) | 125 | 250 | 264 |
| Number of passes | 4-20 | 4-32 | 8-40 |
| Volume (L) | 0.19 | 1.33 | 2.60 |
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. To achieve optimal results, 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 | absorbance within 1m pathlength |
| 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 |
