Airoptic
GasEye OpenPath
GasEye Openpath is a single or multi-laser analyzer that utilizes tunable diode laser (TDL) absorption spectroscopy. The central unit sends a laser light through the path to the retroreflector on the opposite side of the path. When a gas of interest is present in this path, it will absorb the laser light. According to Lambert’s Beer law, the optical power detected in the central unit will depend on the concentration of the gas, temperature, pressure, and optical pathlength. Thus in order to determine the gas concentration, the analyzer requires information regarding temperature, pressure, and optical pathlength. Temperature and pressure signals can be provided by analog inputs, via industrial communication protocols, or as manual values via Webserver or HMI.
In the GasEye Openpath analyzer, the laser wavelength is specifically chosen to match the fingerprint region of the particular gas of interest and is being continuously scanned over the absorption line. Since full spectral information is recovered with very high spectral resolution the analyzer remains immune to foreign gas broadening and is immune to cross-interferences from dust and any other gas constituents in the process. GasEye Openpath by design can operate in several wavelength regions from Near-Infrared to Mid-Infrared.
Example Applications
- Gas quality measurement
- Safety monitoring
Example Industries
- Petrochemical industry
- Chemical industry
- Paper industry
Features
- Pathlength: up to 1000m
- Process temperature: ambient
- Real time sensing: response time below 1 second
- High sensitivity: detection limits down to ppb range
- Maintenance free: equipped with a self-calibrating feature, no field calibration necessary
- High selectivity: automatic compensation for interference effect from other constituents in the gas sample
Operating principle
GasEye Openpath is a laser spectrometer that uses single line molecular absorption spectroscopy. A semiconductor laser emits a beam of infrared light which passes through the process and impinges the detector on the receiver side. When the target gas is present the light intensity changes and this can be used to determine the concentration of the measured specimen. The wavelength of the radiation emitted by the laser is chosen to match the specific absorption line wavelength of the gas. The laser continuously scans this single absorption line with a very high spectral resolution. The measurement is free of cross-interferences since the laser light is absorbed very selectively by only one specific line in the scanned spectral range.
GasEye Openpath Details
 Mechanical specification: |
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| Central unit dimensions: | width x height: 330 mm x 370 mm length: 1300 mm |
| Central unit weight: | 30 kg |
| Retroreflector | 5″ – 10″ |
 Materials: |
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| Housing: | SS 1.4301 (AISI 304) |
 Climatic conditions: |
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| Ambient temperature: | 5ºC to 45ºC |
| Ambient pressure: | 950 – 1050 hPa |
| Ambient humidity: | RH < 90%, non-condensing |
 Measurement conditions: |
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| Sample gas pressure: | ambient |
| Sample gas temperature: | ambient |
 Calibration/validation: |
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| Calibration: | factory calibration using certified gas | |
| Zero drift and span drift: | negligible | |
| Validation: | Removable sealed H2S cuvette with reference gas | |
| Safety: |
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| Low Voltage Directive (LVD) 2014/35/EU | PN-EN 60825-1:2014-11 – Safety of laser products – Part 1: Equipment classification and requirements | |
| PN-EN 61010-1:2011 – Safety requirements for electrical equipment for measurement, control and laboratory use – Part 1: General requirements | ||
| EMC Directive 2014/30/EU | EN 61326-1:2013-6 – Electrical equipment for measurement, control and laboratory use | |
| RoHS Directive 2011/65/EU | ||