The UV DOAS SENTINEL system represents the most cost effective

The UV DOAS SENTINEL system represents the most cost effective, yet technically capable solution for monitoring a variety of ambient and toxic gases on a real-time basis. A single system deployed along a 50-1000 meter fenceline can identify the ppb-level gas, quantify the amount, and provide alarm outputs to pager, cell phone, or other monitoring technologies. Data can be sent real-time to an internet site where local residents, regulators, or site managers can access the data from any location with web-access.

The system is capable of detecting ambient air concentrations from the lower ppb to ppm range

Available Compounds for Measurement:
Benzene ,Carbon Disulfide ,M-Xylene ,O-Xylene,P-Xylene,
Sulfur Dioxide ,Toluene ,Ammonia,Ethyl Benzene ,Mercury,
Nitric Oxide ,Nitrogen Dioxide,Formaldehyde ,Acetaldehyde,
Ozone ,Acrolene,Hydrogen Sulfide ,1,3 Butadiene,Chlorine, Isoprene

Additional chemicals:
Bromine ,Hydrogen cyanide ,Chlorine dioxide,Carbon monoxide,
Carbon dioxide ,Phosgene,Hydrogen bromide ,Hydrogen chloride,
Nitrous acid,Nitrous oxide ,Nitrate radical ,Oxygen,Sulfur trioxide,
Hydrocarbons ,Naphthalene,Acethylene ,Ethene ,Ethane,Ethanol,
Propane ,Trimethylbenzene,Phenol ,o-,m-,p-Cresol

UV DOAS SENTINEL is a “bi-static” system whereby the UV emitter is located at one end of the path, and the receiver is located at the other end of the path.

UV DOAS SENTINEL utilizes advanced CCD-array detector technology. There is no requirement to cool this detector to improve performance. This eliminates the costly cooling systems required by other systems available on the market, and the no-moving-parts design improves the mean time to failure (MTTF), and overall reliability. The receiver/spectrometer is temperature controlled via solid state thermo-electric peltier cooling. This no moving parts system provides measurement stability under the ambient temperature variations experienced in the field. The system is high reliability, maintenance free, and requires no consumables such as LN2.

The output of the system is both raw spectroscopic, and also computer-aided analysis (concentration value) data.

ETG RISORSE E TECNOLOGIA is supplying this equipment because it directly meets the intended goals and objectives often required in a wide array of possible monitoring scenarios;

low minimum detection levels for the compounds specified
quality, traceable, legally defensible data
advanced, automated software, thus reducing or eliminating the costs associated with post-data analysis
low initial cost to purchase when compared to other technologies
negligible cost-of-ownership due to low maintenance, no consumables, inexpensive replacement parts
minimal training due to easy user-interface
extremely lightweight and portable…can be set up and taking data in under 10 minutes

UV DOAS SENTINEL - A complete automated air monitor system is provided: The following components and accessories are included in the package:

UV Xenon Optical Transmitter Unit
UV Integrated Spectrometer Optical Receiver Unit
2 (ea) Tripod mounts
Computer controller
2 (ea) 230 VAC power cable,
1 (ea) USB signal cable
2 (ea) Detachable alignment scopes
UV DOAS SENTINEL Continuous Monitor Software
Internally-mountable sealed calibration cell containing a mix of benzene and sulfur dioxide gases
Spectral Library allowing real-time detection, quantification, and continuous monitoring.

Technology Description: The heart of the ETG RISORSE E TECNOLOGIA UV open-path monitoring system is based on charge capacitor diode array (CCD) technology. The fundamentals of the system’s operation is simple. First, ultra-violet light is generated from some type of source, usually either a deuterium or xenon lamp. The light is collected and concentrated using standard telescope optics. The concentrated light then passes through an input lens into the spectrometer via a fiber optic coupling. Once inside the spectrometer, the light is broken out into it various wavelengths by sending it through a holographic grating. The light then hits the CCD array which in turn charges the capacitor. The capacitors are discharged at a sample rate set by the user and the light signal at each light frequency is proportional to the total charge of each capacitor. Finally, a graphical representation of the UV spectra is produced by measuring the electrical charge of each capacitor at each given wavelength (signal intensity vs. wavelength).

The beauty of the ETG RISORSE E TECNOLOGIA UV open-path air monitor lies its size, simplicity of design and ease of use. These three factors enable the system be have the flexibility to meet many different monitoring applications. For example the system has been operated using both a deuterium and xenon sources. Deuterium sources have a lower noise and higher UV spectral component than traditional xenon lamps. The systems have also been operated at both long (850meters, with xenon) and short pathlengths (10meters).

Detailed product information:

News