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Cerex Aeres-XL

Featuring outstanding flexibility, The Aeres-XL is a fixed all-in-one UV-DOAS solution for the most complex stack or process monitoring challenges. With the ability to choose from a range of fiber coupled cells, custom cross process adapters, and insitu mono-static probes, it is ideal for continuous emissions monitoring (CEMs) applications, laboratory setups, closed cell process monitoring, and insitu process monitoring. It comes packaged in a NEMA4 rated enclosure for outdoor environments, or a 19 inch rack mount enclosure for indoor. Like our other UV-DOAS solutions, these analyzers accurately detect gases from part-per-billion (ppb) level to percent level concentrations and report the data in real-time.

The Aeres-XL is an analyzer recognized for it’s accuracy in measuring Ammonia (NH3), Chlorine (CL2), Sulfur Dioxide (SO2), and BTEX, as well as handling challenges with industrial hygiene, leak detection, environment contamination & remediation, and more. Despite the advanced detection system employed in the Aeres-XL, accurate results can be achieved out of the box with a flip of a switch. Automatic operating happens inside the device – no “lab expert” knowledge is required.

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Cerex Hound Series

Cerex Hound analyzers are the solution for your immediate response applications

With over a decade of use by emergency personnel, government agencies, and industry, the UV HOUND and its smaller counterpart, the MICRO HOUND, are proven, highly dependable analyzers for the accurate and sensitive monitoring of single gases and mixtures.

The Hound series is a collection of portable point UV-DOAS analyzers recognized for their accuracy in industrial hygiene, leak detection, HAZMAT first response, environment contamination & remediation, and portable indoor air safety monitoring.

  • Part-per-billion (ppb) level detection limits
    (1.0 ppb for Benzene)
  • Simultaneous multi-gas capability
  • Hours of battery life
  • Greater performance than electrochemical and PID technology at a low cost

Cerex Aeres-XL Series



Measurements: 36″ x 24″ x 14″ (91.4cm x 61cm x 35.6cm)
153 Lbs (69kg)

Performance Specs

Optical Path Length: 2.5 meters Internal Analysis Path


4 consumables make up the Aeres. All are field replaceable in under 15 minutes.

  • UV Source Deuterium Lamp (4000hr)
  • Sample Pump Diaphragm Kit
  • Sample Filter
  • Stack Probe Filter


This unit offers our lowest detection limits with a standard 17 meter sample path.


Measurements: 60” x 29” x 24” (152.4cm x 74cm x 61cm)
Weight: 430lbs (195kg)

Performance Specs

Optical Path Length: 17 meters Internal Analysis Path


Only three consumables make up the UV Hound. All are field replaceable in under 15 minutes.

  • Sample Intake Filter
  • Enclosure Air Filter
  • UV Source – warranted for 4000 hours of operation, typically exceeds 5000 hours

How it Works

Point UV-DOAS Technology

The Cerex UV Hound operates using a process known as point monitoring in an enclosure connected to a stack via a probe. Surrounding ambient gases are channeled into the analyzer via the probe. Following this, an internal cell holds the gas sample for analysis.

Next, with UV-DOAS technology, an ultraviolet light passes through the gas sample contained within the cell. Thanks to a physics principle known as the Beer-Lambert Law and Cerex’s proprietary software, the gas sample can be translated into useable data.

Similar to more expensive FTIR technology, UV-DOAS offers better detection limits at lower cost without interference from water vapor. Within seconds, any compounds present in the internal cell that are UV spectrum-detectable are identified and quantified according to their absorption from the ultraviolet light. Cerex’s Continuous Monitoring Software (CMS) outputs the data in real-time for instant results. Raw data can be accessed either on the Cerex Aeres itself, or remotely via phone, tablet, or computer.

The most cost-effective sampling & detection solution

Offering real time identification and quantification of criteria pollutants, the Aeres analyzers provide sensitive yet cost-effective solution in one easy to operate, all-in-one package – saving thousands of dollars as opposed to expensive, separate laboratory analysis.

Individual species of prolific hazardous air pollutants

Toxins such as Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) are known human carcinogens at ambient air levels. Our Aeres analyzers are capable of simultaneously detecting these 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.

Low maintenance and low detection limits

With only 3 consumables and the capability of simultaneous, single digit, parts-per-billion (ppb) detection levels of multiple compounds, the Aeres is standard for ambient level detection.

Common Detectable Gases

Ultra Low Detection Limits

The Cerex Aeres has as low as parts-per-billion minimum detection limits and wide dynamic ranges, allowing earlier and more thorough detection of gases than traditional sensor arrays. In comparison to outdated technologies, Aeres analyzers feature multi-gas monitoring of individual species, lower detection limits, no water vapor interference, inherent calibration and no sensors to poison.

Inherent Calibration

The analyzer may calibrated insitu using calibration gas delivered from a dynamic calibrator or cylinder standard. Routine calibration is unnecessary for proper operation.

Targeted Library for Increased Value and Cost-Effectiveness

Cerex Aeres analyzers include one multi-purpose standard library suitable for monitoring of 23 compounds. Custom calibrations are available based on application. Additionally, ancillary sensors can be added to the Aeres for detection of other gases not available with UV-DOAS, such as Carbon Dioxide, Carbon Monoxide, Methane, and more.

Aeres Common Target Gases

1,3 Butadiene C4H6
Acetaldehyde C2H4O
Acetone CH3COCH3
Acrolein C3H4O
Ammonia NH3
Benzene C6H6
Carbon Disulfide CS2
Chlorine Cl2
Chlorine Dioxide ClO2
Ethyl Benzene C8H10
Formaldehyde CH2O
Hydrogen Sulfide H2S
Isoprene C5H8
Mercury Hg
Naphthalene C10H8
Nitric Oxide NO
Nitrogen Dioxide N2O
Nitrous Acid HNO2
Oxygen O2
Ozone O3
Phenol C6H5OH
Styrene C8H8
Sulfur Dioxide SO2
Toluene C6H5CH3
Trimethylbenzene C9H12
O-Xylene, M-Xylene, P-Xylene C8H10

*NOTE: For detection of gaseous compounds not available within the UV spectrum, we recommend the Cerex FT-5000 Series. These analyzers use FTIR (Fourier Transform Infrared) that will be perfect for your stack, process or zone monitoring applications.


Results You Can Rely On

Cerex recognizes that detailed gas monitoring results need to be reliable and available quickly to various stakeholders. Consequently, Cerex engineers developed software to accurately detect and display gases within the air, in real-time, from any location.

On a Cerex Aeres, a user can see results on the analyzer itself, or remotely via a phone, tablet, or computer anywhere in the world via a virtual connection. GPS and cellular configurations make this possible in isolated environments.

All data is automatically saved in an easy to access .csv file; this feature helps our clients in various ways - from daily use to crucial events such as evidence in court. Early detection translates into quicker response times, reduced environmental impact, decreased plant downtime, and reduced exposure to site personnel and the community.

Real time spectral subtraction and synthetic background implementation allow the UV Hound and Micro Hound to clearly display accurate concentrations of target gases over 1000 meters without interference from other gas species


Serving clients in a variety of industries

The Cerex Aeres is a fantastic solution for when minimum detection limits must be lower than possible for FTIR, when water vapor can cause interference and key UV-detectable compounds need to be detected within a stack (including Ammonia, Carbon Disulfide, and more).

Hound series analyzers may also be used for portable stack analysis of Ammonia (NH3), Nitric Oxide (NO), Nitrogen Dioxide (NO2), Sulfide Dioxide (SO2), and some volitive organic compounds (VOCS) if installed downstream of a sample conditioning system providing a cool, dry sample. A dilution system may also be required when measuring high parts-per-million (ppm) levels of combustion gases.

The FR options are well suited for smoky or dusty environments with a faster sample rate and replaceable glass fiber sub-micron sample filter.

All Applications

Insitu Process / Stack

Indoor Air Quality

Zone Monitoring

Mobile and Benchtop Laboratory

Extractive and Parallel Stream Process Monitoring

Ambient Air Monitoring

Gas Monitoring

Aeres-XL Specifications

UV Subsystem Specifications
Total Path Length1 17 meters
Light Source Deuterium Deep UV Source
Detector Spectral Range 200-400nm
Light Source Half Life 4000hr

Cell Maximum Gas Pressure

2psig max2

Normal Cell Pressure

+/- 1psig

Cell Sample Temperature Range3

-40°F to 240°F (-40°C to 115°C)

Cell Calibration Gas Port

1/4” Swagelok® Tube Fitting

Cell Sample Connection

1/2” Swagelok® Tube Fitting

Sample Exhaust Connection

1/2” Swagelok® Tube Fitting

Sample Cell Volume

3 Liters

Maximum Sample Gas Temperature

140°F (60°C)

Default Sample System Temperature Set Point

130° F (54.4° C)

  1. Configured during manufacture to meet customer specifications
  2. Set input pressure as close to ambient as possible
  3. Cell materials may withstand this temperature; however the analyzer only supports a maximum sample temperature of 140°F or 60°C.
Detectable Compounds
1,3-Butadiene (C4H6)
Acetaldehyde (C2H4O)
Ammonia (NH3)
Benzaldehyde (C7H6O)
Benzene (C6H6)
Benzyl Chloride (C6H5CH2Cl)
Carbon Disulfide (CS2)
Chlorine (Cl2)
Chlorine Dioxide (ClO2)
Ethylbenzene (C8H10)
Flourine (F2)
Formaldehyde (CH2O)
Glutaraldehyde (CH2(CH2CHO)2)
Isoprene (C5H8)
Mercury (Hg)
Naphthalene (C10H8)
Nitric Oxide (NO)
Nitrogen Dioxide (NO2)
Nitrous Acid (HNO2)
Ozone (O3)
Phenol (C6H5OH)
Propionaldehyde (CH3CH2CHO)
Styrene (C8H8)
Sulfur Dioxide (SO2) - high sensitivity
Toluene (C6H5CH3)
Trimethylbenzene (C9H12)
Valeraldehyde (C5H10O)
m-Xylene (C8H10)
o-Xylene (C8H10)
p-Xylene (C8H10)
General Parameters
Part Number


Analyzer Electrical Supply Requirements1

240VAC 50A

Analyzer Maximum Operating Current2


Analyzer Nominal Operating Current2


Ambient Operating Temperature with Air Conditioner

-40° to 130° Fahrenheit

-40° to 55° Celsius

Measurement Principle Beer-Lambert Law
Measurement Technique Classical Least Squares (CLS) regression analysis; optional Partial Least Squares (PLS)
Dimensions (standard)

72” x 36” x 30”

(182.9cm x 91.4cm x 76.2cm)

Weight (standard)

435lbs (197.3kg)

Flow Rate


Maximum Sample System Temperature

140°F (60°C)

Default Sample System Temperature Set Point

130° F (54.4° C)

  1. See site specific design description for load distribution.
  2. Heated tube bundle not included. See site specific design description for site specific loads including tube bundle.
Measuring Parameters
Concentration measurement accuracy ±5 % Reading TYP
Concentration measurement precision ±5 % Reading TYP
Interferent Mitigation Real time spectral subtraction and residual subtraction, multi-peak analysis.
Zero point calibration Simultaneous dual mode natural zero and/or synthetic zero on gas by gas basis. Automated compound specific background selection.
Real Time Operating Software Cerex Continuous Monitoring Software (CMS)
Operating System Windows 7, 8, 10
Post Collection Analysis Software Cerex Data Processor
Operating System Windows 7, 8, 10
Internal Quality Assurance Cell
Type Internal linear multi-pass cell permanently mounted in beam path. External window removable.
Calibration gas inlet 1/4" Swagelok
Calibration gas outlet 3/8" Swagelok
Path Length 0.047m
Volume 0.33 L
Maximum sample pressure 1 PSI
Pressure and temperature measurement Integrated pressure and temperature sensor
HMI Touchscreen (standard model)
Digital Interface RJ45 Ethernet LAN Port for local or internet based remote data and access using MODBUS TCP, VNC, and remote desktop.  Spectral data may be stored locally, on a NAS, or disabled. Industrial external wireless option available. Type A USB for data retrieval and peripheral accessories.
Power Connection Environmentally sealed circular Amphenol bayonet connector.
Integrated Computer Embedded industrial PC.
Automated Motorized Positioner Intelligent automatic multi-path positioner: Operator programmable path scanning or dynamic path scanning based on meterological conditions.
Integrated Wind Mapping Three dimesnional ultrasonic anemometer with temperature measurement. Data integrated into CMS data tables and available via MODBUS.
Integrated Data Acqusition External ports with data integration for particulate or ancillary co-located analyzers (TDLAS laser, electrochemical, etc.).
Data Output MODBUS over RS-232, RS-485.  MODBUS over TCP-IP is standard.
Analog Output 8 channel configurable 0-24mA (4-20mA with extended range)


(Coming Soon) Aeres Brochure (PDF 3.9MB)
(Coming Soon) Aeres Technical Sheet - Specifications (PDF)

Discuss your project with our application specialists

Our engineers have decades of experience in creating custom solutions to meet your monitoring challenges