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Aurora TDLAS Hygrometer

Aurora TDLAS Hygrometer

GGE’s Aurora analyzer uses tunable diode laser absorption spectroscopy (TDLAS) to measure moisture in natural gas rapidly and accurately. The analyzer is suitable for installation in hazardous areas and operates over a wide range of environmental conditions. Aurora’s fast response quickly alerts and documents when moisture concentrations are out of compliance. Once process upsets are corrected and the gas dries out, the fast response enables natural gas to be cleared for entry into the “energy grid.”

GE’s experience in moisture measurement includes aluminum oxide, polymer capacitance and chilled mirror sensors. GE’s heritage also includes the development of the first injection diode laser in 1962 by Dr. Robert Hall in Schenectady, NY. The compact and inexpensive diode laser made it possible for compact discs, laser printers and fiber optic telecommunications. The new Aurora TDLAS hygrometer enables natural gas processing and transportation facilities to monitor moisture content in real time with high precision and reliability.

Aurora Microsite

Aurora Microsite 3D

 

 

Moisture Calculator iPhone App

Get the Moisture
Calculator iPhone app.

 

Aurora TDLAS Hygrometer Specifications

Analyzer

Fast Response

  • Detects process upsets in real-time
  • Once process upsets are corrected, Aurora enables gas supply to be put into the energy grid-generating revenue
  • Helps maintenance personnel to be more productive-system verification is done in a few minutes
  • No expensive reference gases are required

Precise

  • Assures both the buyer and seller that the gas quality meets contractual and tariff requirements
  • Knowledge of accurate moisture content allows better optimization when blending high heating value gas with low heating value gas

Ease of Operation

  • Back lit three-function LCD shows process conditions at a glance
  • Magnetic stylus programs unit in the field through-the-gas without hot permit

Reliable and Safe

  • cFMus, ATEX & IEC certified for hazardous areas
  • Self diagnostics
  • Dual independent digital ports enable data acquisition and diagnostics without interruption to SCADA systems
  • MODBUS protocol

 

Sampling System

Turnkey

  • Fully integrated sampling system that removes liquids, while filtering and controlling pressure and flow rate
  • High-quality stainless steel and inert wetted components
  • NACE option for sour gas

Multi-stage Filtration

  • Primary stage installs at pipeline, secondary stage maintains measurement integrity

Key Features & Benefits

  • Optical response:
  • No cross sensitivity to glycols or other contaminants
  • Direct readout in lbs/mmscf, mg/m3, dew point or ppmv
  • Turnkey sampling system for measurement integrity
  • “Through-the-glass” programming with magnetic stylus. No “hot permit” needed.
  • Hazardous area certifications: cFMus Class I, Div 1, Groups C and D, ATEX & IECEx Ex de IIB T6
  • Three programmable 4-20mA signals—monitor gas quality 24X7
  • Two digital RS 485/232 ports with MODBUS RTU— direct connection to digital SCADA systems
  • Supplied with AuroraView software— enables remote readout, trend graphing and diagnostics
  • Reliable—designed for five years of continuous service before first factory service

 

AuroraView PC Software

The system is supplied with AuroraView software, a utility that enables the Aurora to interface to a remote personal computer. AuroraView enables remote readout of user-selected parameters, trend graphing, diagnostics and the capture of the spectral scan. Trend data and spectral scans can be saved as ASCII text files, facilitating the ability to export and share the data in other application software such as Excel™.

Auroraview PC Software Screenshot

AuroraView has intuitive pull-down menus for setting up the parameters to be displayed, graphed and data logged.

Auroraview PC Software Screenshot

AuroraView software displays direct readings of moisture, temperature and pressure, as well as trend graphs. The data trends can be exported as ASCII text and opened in spreadsheet programs such as Excel™.

Moisture monitoring in oil & gas and transportation facilities.

Power

Analyzer 100-240 VAC, 50-60 Hz, 10 W
18-32 VDC (24 VDC nominal), 10 W
Optional Electrical Heater 120 VAC, 120 W
230 VAC, 75 W

Range

Parts Per Million by Volume 5 to 5000 ppm
Dew/Frost Point1

-65.5° to -2.6°C frost point

-85.9° to 27.3°F frost point

Process Dew/Frost Point1 Process or equivalent dew point/frost point by calculation with process pressure signal (4-20 mA) or constant
Absolute Humidity 3.8 to 3,803 mg/m3
Absolute Humidity 0.24 to 237 lbs/MMSCF
1 Readings below 0°C (32°F) are in "frost point," temperature and above 0°C (32°F) are in “dew point” temperature.

Accuracy

Parts Per Million by Volume ±2% of reading or 4 ppmv
(Accuracy of other parameters derived from ppmv.)

Response Time

Optical Response
System Response The system response is dependent on the length of sample tubing, sample system components, flow rate and pressure, as well as the change in moisture concentration.

Operating Pressure

Operating Sample Cell Pressure 69 to 172 Kpa (10-25 psia)
Maximum Pressure 1380 KPa (200 psi)
Process Pressure 10,342 KPa (1500 psig) maximum2
2 Higher pressure available with application of additional sampling system components.

Temperature

Operating -20 to 65°C (-4 to 149°F)
Storage -20 to 70°C (-4 to 158°F)
Optional Heater/Thermostat Set Point 25°C (77°F)

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

Display

Backlit LCD. Three programable simultaneous parameters. Alphanumeric status and diagnostic display. LEDs for power, laser temperature stability, keypad lockout.

I/O

Analog Outputs Three programmable 0/4-20 mA; 500 Ohm max load.
Analog Input Loop powered 4-20 mA input for remote pressure transmitter. Aurora supplies 24 VDC.
Digital Interface Two programmable digital communications ports RS232, RS485 with multidrop capability and assignable address, Modbus RTU protocol

Enclosure

Ingress Protection IP-66

Laser

Class 1 product. Conforms to IEC 60825-1. Edition 2.0
Safety of Laser Products

User Interface

Programmable “through-the-glass“ via magnetic stylus

Net Weight

37 Kg (100 lb)

Hazardous Area Certification

USA/Canada Explosion-proof for Class I, Division 1, Groups C&D
EU and Elsewhere ATEX and IEC Ex:
Ex de IIB T6 -20°C to +65°C
Flameproof with increased safety compartment

Certification

CE Complies with EMC Directive 2004/108/EC, Low Voltage Directive 2006/95/EC and Pressure Directive 97/25/EC for DN/25

Recommended Factory Verification/Service

Five years

Descriptions English Deutsch Russian
"The War Against Water" Hydrocarbon Processing Article \
A Comparison of Moisture Measurement Technologies for Natural Gass A Comparison of Moisture Measurement Technologies for Natural Gass
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Aurora TDLAS Hygrometer Application Worksheet Aurora TDLAS Hygrometer Application Worksheet
Aurora TDLAS Hygrometer Brochure Aurora TDLAS Hygrometer Brochure Aurora TDLAS Hygrometer Brochure Aurora TDLAS Hygrometer Brochure
Aurora TDLAS Hygrometer Operating Manual Aurora TDLAS Hygrometer Operating Manual
Development of an Automated Calibration System for TDL Moisture Analyzer Development of an Automated Calibration System for TDL Moisture Analyzer
Development of Tunable Diode Laser Absorption Spectroscopy Moisture Analyzer for Natural Gas Technical Paper Development of Tunable Diode Laser Absorption Spectroscopy Moisture Analyzer for Natural Gas Technical Paper


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