Model: Hound Series
Manufacturer: Cerex
Portable UVDOAS Multi-Gas Analyzers
The Cerex Hound series point gas detectors are portable multi-gas analyzers developed to detect part-per-billion (ppb) to percent level concentrations of multiple gases within a mixture. The Hound produces laboratory quality results in real-time using ultraviolet light absorption – similar to traditional infrared detectors, but features lower detection limits on many human health hazards and does not interfere with water vapor. All Hound series analyzers come standard in a weather-resistant case with an integrated display, active ambient air sampling, and wireless communication. The FR versions are well suited for smoky or dusty environments with a faster sample rate and replaceable glass fiber sub-micron sample filter.
Features
Cerex UVDOAS Delivers What Other Technologies Cannot
Unlike Electro-chemical, PID, FID and GC/MS based detection methods, Cerex UltraViolet Differential Optical Absorption, UVDOAS, delivers simultaneous monitoring of ppb levels of individual VOC species like Benzene, Toluene, Ethylbenzene, and Xylene in real time. The method is unaffected by ambient humidity, requires no sample conditioning filter change prior to monitoring, requires no carrier gas, requires no wet chemistry, and incurs no analytic costs or sample handling costs. Results are immediate, and the raw data containing all the information necessary for gas identification and quantification is always saved.
UVDOAS Principle of Operation
Similar in principle to more expensive FTIR, UV-DOAS offers better detection limits at lower cost without interference from water vapor.
Unlike PID and FID, UVDOAS can identify individual gas compounds in real time without specialized one time use filters. The technology works by directing a UV beam through an ambient air sample then into a high resolution miniature spectrometer where the unique wavelength dependent absorptions due to target gases are individually measured and recorded. A classical least squares regression analysis compares the measured absorption spectrum to calibrated reference absorption spectrum files.
Beer’s law is then used to determine gas concentrations per USEPA TO-16 Methodology. Hound series analyzers will detect many gases simultaneously at ppb concentrations within complex mixtures.