Tunable diode laser dew point analyser
Aurora Moisture Analyser
low maintenance
quick speed of response
high accuracy and reliability

The Aurora moisture analyser provides a wide range of reliable measurement with the accuracy and fast response needed for immediate alerts to process upsets or out-of-compliance moisture concentrations.
Using a laser to monitor low level humidity offers a number of key benefits.
This robust, non-contact analyser is highly accurate with an extremely rapid speed of response, and has led the industry to a new era in water vapour measurement. The ability to monitor humidity in near real time has led to significantly improved confidence in the measurement, and improved process efficiencies. The speed of response of the analyser enables rapid detection and recovery from process upsets, allowing easier diagnosis of plant problems and rapid return to normal process level, allowing quick return to shipping product.
The graph below shows the difference in response between a laser system and a more traditional aluminium oxide sensor to short bursts of water vapour. The laser shows a full scale deflection, while the aluminium oxide shows hardly any change.
GENERAL |
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Measurement |
Water vapour |
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Measurement principle |
Absorption spectroscopy using a tunable diode laser |
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Range |
ppmv: application dependent |
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Lower level of detection |
application dependent |
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Dew/frost point |
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Accuracy |
ppmv ±2 % of reading or 4 ppmv |
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Response time |
Optical response: ‹2 secs System response dependent on build of sample systmem, flow rate and pressure, and changes in moisture concentration |
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Operating pressure |
Operating sample cell pressure: 69 to 172 Kpa (10 to 25 psia) Maximum pressure: 1380 Kpa (200 psi) Process pressure: 10,342 KPa (1500 psig) maximum (Higher pressure available with additional components) |
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Temperature |
Operating temperature: -20 to 65 °C Storage temperature: -20 to 70 °C |
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Flowrate |
Sample cell flowrate 10 to 60 SLH (0.4 to 2 SCFH); 30 SLH (1 SCFH) nominal Coalescer by-pass fast loop: 5 to 10X of flowrate through sample cell |
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Display |
Backlit LCD |
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Calibration |
Recommended factory verification/service: 5 years |
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Certification |
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USA/Canada |
Explosion-proof for Class I, Division 1, Groups C&D |
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EU and elsewhere |
ATEX and IEC Ex: Ex de IIB T6 -20 °C to +65 °C Flameproof with increased safety compartment |
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European |
CE marked. Complies with EMC directive 2004/108/EC, low voltage directive 2006/95/EC and pressure directive 97/25/EC |
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Shipping |
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Net weight |
37 Kg (100 lb) |
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MECHANICAL |
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Dimension |
46w x 332.3d x 841.2h mm |
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Ingress protection |
IP-66 |
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ELECTRICAL / UTILITIES |
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Power |
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Outputs |
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All specifications subject to change |
WHITE PAPERS AND PUBLISHED ARTICLES:
Aurora TDLAS analyzers for hydrogen recycle applications
Development of a TDLAS moisture analyser for natural gas
Moisture measurement technologies
The development of an automated calibration system for tunable diode based moisture analysers
OPERATIONS MANUAL:
CALCULATORS AND CONVERSION CHARTS:
TECHNICAL BULLETINS:
APPLICATION NOTES:
Heat treating H2O, H2, O2 analyzer solution
Moisture measurement for industrial gases in heat treating
Natural gas: processing, transportation, storage, and custody transfer
DRAWINGS:
Drawing for Aurora moisture analyser
DATASHEET: