Moisture can’t escape
our innovation

Aurora SeriesHigh precision TDLAS
moisture measurement

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Moisture can be costly even in small quantities.
Aurora Series laser moisture analyzers deliver
sharp signals and specific detail with thefastest response of any moisture measurement
technology. When the smallest amount ofmoisture can stop your large facility, shut you outof a pipeline, or damage your valuable assets,
you need Aurora.

Using tunable diode laser absorption spectroscopy (TDLAS), Aurora analyzers have thetechnology to rapidly and accurately measure moisture in your process gas. With Aurora,you’ll get continuous, fast responding and reliable readings with precise measurements.
Baker Hughes has a heritage of moisture measurement and laser development. For morethan 50 years, Panametrics legacy technology has been at the forefront of moisturemeasurement. Baker Hughes Dr. Robert Hall, from Schenectady, New York, also madethe first injection diode laser in 1962. Today, diode lasers
are compact, inexpensive and widely used in a
number of industries. Aurora Series analyzers
combine expertise with cutting-edge technology
for moisture measurement you can trust.

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A sharper signal.

Because you need to know.
When profits rely on detecting moisture, you want thesystem that provides the clearest signal. Aurora Series
laser absorption spectroscopy technology is the key.
It solves the problem of background gas interference,pressure/temperature variation and requirement for zeroreference, providing you with a reliable, continuous moisturemeasurement.
Aurora TDLAS analyzers provide:• Speed-of-light measurement- Instant alert to compliance orprocess issues- Fastest confirmation of process
upset recovery• Problem-free performance- Hazardous area certification available- Through-the-glass programing- No hot permit required• Measurement integrity- State-of-the-art moisture calibration- NIST-traceable standards- Automated for repeatability- Data archived

Aurora measurement fundamentals
The measurement principle used by Aurora analyzers isbased on the Beer-Lambert Law.

- Non-contact measurement,no sensor drift- Rugged for all environments andany weather- Flexible installation—fixed, rack or portable

A = Absorbance- No field calibration needed

I = Light intensity transmitted through a sample gas- No zero reference or baseline requiredSafety right out ofthe box

Io = Incident light intensity
S = Absorption coefficient*
L = Absorption path length (a constant)
N = Concentration of the water vapor in the absorption cell
* The absorption coefficient is a constant at a specific temperature,pressure and background gas composition.

The concentration of water is directly related to the partialpressure. At certain specific frequencies, light energy will beabsorbed by water molecules. As the concentration of waterincreases, the absorption also increases. Aurora analyzers
sweep the diode laser output through a narrow spectrumof light frequencies. By measuring the return light intensitywith a photo detector as compared to the incident lightintensity, the analyzer provides a direct indication of thepartial pressure of water. The partial pressure divided by the
total pressure yields the mole ratio, which may be expressedas parts per million by volume (ppmv) or parts per billion byvolume (ppbv).

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The test of timeand reliability.

Accuracy that’s
always on.

As with all Panametrics products, Aurora TDLAS analyzers arebuilt for reliability. This reliability is proven through a rigorous
testing process. For a simulated five-year period, the devices
are exposed to the harshest of elements: extreme heat, frigid
cold and high humidity.

You can sleep because you know that Aurora analyzers
won’t. There is no need for baseline measurement data andthere are no blind moments. They are always monitoring,with accurate process information that’s available fasterthan any other technology.

Because they have endured all these severe testing methods,
you can be assured that they will run continuously andfearlessly—no matter where on earth you place them.

5Just connect
and go.
With power and gas lines that easily connect, Aurora TDLAS
analyzers are ready for immediate moisture measurement.
We understand not only how valuable seconds can be whenanalyzing moisture, but also how valuable your time is. So
we‘ve developed these analyzers with many time-savingfeatures:• Easy to learn, configure and operate• Turnkey sample system: just connect power and gas lines• Field programmable with magnetic wand—no need toopen unit or to obtain a hot permit• AuroraView intuitive interface• Minimal maintenance and supervision required

Backed by a half
century of Panametrics
experience.
Aurora’s cutting-edge technology is just one example ofour commitment to continuing a long, successful history inmoisture measurement. You now have a choice in moisture
analyzers—brought to you by an industry leader.
Our expertise includes:• Aluminum oxide moisture analyzers• TDLAS moisture analyzers• Automated manufacturing and calibration• Six Sigma testing methodology• Global field testing• Traceable standards from NIST and national metrology
institutions

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The location of the peak on the X-axis confirms
the identity of water. The y-axis is related tothe partial pressure of water and therefore theconcentration. The system is equipped with
AuroraView software, which enables users tocapture the absorption spectrum and export itto other application programs such as Excel™.

Aurora Series TDLAS technology
provides the right analyzer for themost comprehensive view of themoisture content in your process gas.

7Aurora MoistureAnalyzer
The Aurora moisture analyzer provides a wide range ofmeasurement with accuracy and fast response you needfor immediate alert of process upset or out-of-compliancemoisture concentrations. Once corrected, gas can be quickly
cleared for re-entry to pipeline or process. The Aurora
features patented pressure and temperature compensatedcalibration to minimize variations in background gascompositions.
Applications include moisture in:• Natural gas dehydration processing• Natural gas storage, transmission and custody transfer• Carbon dioxide for enhanced oil recovery• Carbon dioxide in carbon sequestration• Metal heat treating furnace gases• H2 recycle gas in reforming89Aurora TransPort
Portable Moisture
Analyzer
The Aurora TransPort, the latest addition to the Aurora Series,
is a battery operated, moveable analyzer that can be taken
into the field to directly measure moisture content of natural
gas and other process gases.
The unit is assembled into a rugged and transportablecase with a telescoping handle and wheels. It features arechargeable battery providing 8 to 10 hours of operationand an integrated sample conditioning system.
Aurora TransPort is ideally suited for spot checking processes
or for field verification of permanently installed moisture
analyzers and transmitters.
Applications include:• Natural gas processing and drying systems• Gas storage facilities• Compression stations• Refinery processes• Heat treating furnaces• Instrument air10

Aurora RM
Reliable moisturemeasurement
Aurora RM rack-mount analyzer uses tunable diode laser
absorption spectroscopy (TDLAS) to accurately measuremoisture in a variety of background gases. The Aurora RM
analyzer is suitable for installation in safe areas and operatesover a wide range of environmental conditions.
Applications include:• Moisture in glove boxes• Moisture in desiccant and membrane dryer testingand monitoring• Moisture in metal heat treating• Moisture in testing and calibration

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BHCS33912B		

(07/2023)

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