Available in three models, the Cerex UV Hound series point gas detectors are portable multi-gas analyzers developed to detect part-per-billion (ppb), part-per-million (ppm), and percent level concentrations of multiple gases and mixtures. The Hound produces laboratory quality results in real-time using ultraviolet light absorption technology. The UV Hound series analyzers feature multi-gas monitoring of individual species with lower detection limits than FTIR, NDIR, electrochemical, and other technologies. Additionally, the UV-DOAS technology is not affected by water vapor interference, and the technology does not suffer sensor poisoning.

Toxins such as Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) are known human carcinogens. Our analyzers are capable of simultaneously detecting these toxins in addition to oxides of Nitrogen (NOx), CAFO emissions such as Ammonia (NH3) and Hydrogen Sulfide (H2S), and other volatile organic compounds (VOC’s) below hazardous levels – part per billion (ppb) levels.

Capable of simultaneous single digit ppb detection levels of multiple compounds, the UV Hound provides accurate results with a low cost. All Hound series analyzers come standard in a weather-resistant case with an integrated computer and touchscreen display, active ambient air sampling, and integrated WiFi. With hours of battery life and greater performance than electrochemical and PID technology, the Hound is the solution for your immediate response applications.

The UV Hound Series are part per billion (ppb) to percent level chemical detection and quantification open-path UV-DOAS analyzers. Cerex provides variations of the UV Hound to provide an optimum analyzer per application. Within the UV Hound series, the options which drive the different models are environmental resistance – enclosure type – and bulb type. Our most popular UV Hound is a mono-static Xenon based analyzer capable of monitoring fenceline lengths of 1km or more for chlorine (Cl₂), benzene (C₆H₆), acrolein (C₃H₄O), sulfur dioxide (SO₂), and other VOC detection. Cerex also offers a Deuterium based analyzer for monitoring ammonia (NH3), 1,3-Butadiene (C₄H₆), high sensitivity sulfur dioxide (SO₂), benzene (C₆H₆), and many other VOCs; however, the deuterium system is optimized for fenceline lengths of 225m or less in a mono-static configuration or 450m or less in a bi-static configuration.

The Cerex UV Hound offers high performance, time resolved monitoring of a variety of regulated gases. With part per trillion minimum detection limits for benzene the UV Hound allows regulatory compliance for SCAQMD Rule 1180 and BAAQMD Rule 12-15 BTEX monitoring. It also represents a stand-alone solution for alternative MACT compliance for US EPA Method 325 refinery fenceline benzene monitoring.

A true multi-gas analyzer solution, fielded units measure acrolein, ammonia, BTEX, 1,3-butadiene, chlorine, formaldehyde, naphthalene, nitric oxide, nitrogen dioxide, phenol, styrene, sulfur dioxide and more. Path lengths tested to 1300 meters offer gap-less monitoring coverage with hands-off reliability.

Acid Plant Monitoring
Benzene, Toluene, and Xylenes (BTEX)
Brownfield Remediation
Chemical Depot Monitoring
Electrowinning Emissions Monitoring
Fenceline Perimeter Monitoring System (FLMS)
Manufactured Gas Plant Remediation (MGP)
Perimeter Ambient Monitoring System (PAMS)
Superfund Site Remediation
Tank Farm Monitoring

EPA Method 325
40 CFR 63.658 (MACT)
SCAQMD Rule 1180
BAAQMD Rule 12-15

STI, a Cerex factory trained installer, has installed the following live monitoring systems:

Chevron El Segundo
Marathon Carson
Marathon Martinez
Valero Benicia
Valero Wilmington

Other Links:
Hanford Vapors
OBG – Indiana Harbor

Standard Model
– Recommend monthly inspections of lamp, air filter and fans.
– Air filter replacement time is site specific
– Lamp replacement time is application specific (2000 hour guaranteed half-life)
– Fans are rated to 50,000 hours at 40°C

Sealed Model
– Recommend monthly inspections of lamp, fans, and dirt buildup.
– Rinse air conditioner fins as needed
– Lamp replacement time is application specific (2000 hour guaranteed half-life)
– Fans are rated to 40,000 hours at 40°C

The standard UV Hound is packaged in an aluminum, type 3R (IP23) enclosure. The analyzer is air cooled and has an operating temperature range of 32°F to 122°F (0°C to 50°C). The analyzer uses the surrounding ambient air for ventilation; therefore, the air must not be corrosive to circuit boards or aluminum. This package is tripod mountable for semi-permanent installations. For permanent installations, Cerex recommends sheltering this instrument to protect from wind and solar loading.

The environmentally sealed version of the UV Hound is packaged in an type 4X – IP54, thermoelectrically cooled, enclosure with an operating temperature range of -40°F to 131°F (-40°C to 55°C). This option should be used for system deployment in corrosive environments. This package is tripod mountable for semi-permanent installations. For permanent installations, Cerex recommends sheltering this instrument to protect from wind and solar loading.

Many gas compounds absorb UV light energy at specific wavelengths. The UV Hound emits UV light energy to a reflector some distance away then measures the reflected UV light to detect gas compounds which were present in the light beam. For a compound to be detected by the UV Hound , there must be UV energy present at the wavelength where the gas compound absorbs. Cerex offers two UV bulb types for the UV Hound – Deuterium and Xenon. The primary reason to select one bulb type over the other is to have sufficient energy for analysis for your compounds of interest. The spectral curves produced by each bulb can be seen in the chart below.

Deuterium has more energy below 240nm and is required to detect 1,3-Butadiene (C₄H₆), ammonia (NH₃), nitric oxide (NO), and others; however, it should only be deployed to monitor distances up to 225m in a monostatic configuration or 450m in a bistatic configuration.

Xenon is required for measuring longer distances, 1km or more, with a single instrument.

Each UV source has a unique list of benefits and limitations. Cerex is currently the only manufacturer to offer the Deuterium source technology in an open-path monitor configuration. The added capabilities that this option offers are unique to the Cerex system.

Deuterium Detectable Gas Compounds

Xenon Detectable Gas Compounds

Below are specifications for standard UV Hound configurations. Customization is available. Customization may alter these specifications.

Detection limits are a function of the UV light source, installed path length, and site conditions. The detection limits shown have been empirically determined from bump tests of fielded refinery instruments at full path-length. These results are also consistent when exposed to a mixture of benzene, toluene, ethylbenzene, and xylenes (BTEX).

These detection limits may improve if the UV Hound is only monitoring for one gas in a relatively clean environment.

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