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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.

How it WorksUVDOAS

UVDOAS (Ultraviolet Differential Optical Absorption Spectroscopy) is a monitoring technique which uses the absorbance of UV light to identify and quantify gases within a sample. Gases absorb unique wavelengths of light, creating a unique fingerprint of each compound within the absorbance spectrum; the amplitude of the absorbance wavelength is proportional to the concentration of the gas present in the sample (Beer-Lambert Law).

Cerex Aeres-XL analyzers use a collimated beam of light through a multi-pass cell to obtain these spectral fingerprints and then, using a pattern-matching classical least squares regression analysis, compare them to a vast library of stored references. The result is a real-time concentration number of the gases of interest.

In comparison to outdated technologies, Cerex’s Aeres-XL analyzers feature:

  • Multi-gas monitoring of individual species and regulated VOCs
  • Real time measurements of simultaneous gases verifiable at any time
  • Cross stack, Insitu probe and Parallel cell models
  • Two independent stack or process connections
  • Externally controlled, electrically driven, valve manifold
  • Inherent calibration
  • Fully autonomous continuous operation
  • Cannot be Poisoned]
  • Cross and process pipe adapters
  • Fast UVDOAS acqusition cycles
  • Operator specific control outputs
  • Extended temperature control options for extreme environments
  • NEMA enclosure
  • Configurable alarms and alerts
  • Low cost of ownership

All Aeres-XL analyzers come standard with an integrated computer, touchscreen display, propriety real-time monitoring software, active ambient air sampling, and integrated WiFi.

Aeres-XL 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 Model

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)

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