Fast, online measurement of fuel gas interchangeability (Wobbe) and stream composition using a fully automated, all-optical instrument.Request a Quote
All OMA models are equivalent in function and performance with identical electronic configurations. The models vary by form factor and materials of construction, each intended for a unique use case.
The OMA-300 is offered in two explosion-proof formats:
Eexp systems are purged and pressurized using a certified air-purging device. This method ensures that toxic/explosive gas is not allowed to accumulate inside the enclosure and is ideal when instrument air is available.
Eexd systems are contained within certified explosion-proof cast-aluminum enclosures. This method is more practical if the installation is remote or utilities are unreliable.
The Wobbe Index (WI) expresses the heating value (known as calorific value) of gases used as fuels, taking into account the proportionality of calorific value to the specific gravity, or the density ratio between the given fuel gas and air. More precisely, the specific gravity is proportional to flow velocity through a constant orifice size at a constant pressure, and thus proportional to gas calorific value.
This measurement is important to operators because it can quickly determine the interchangeability of two or more fuel gas streams. At a flare or a custody transfer station, this measurement is a constant necessity.
To analyze the chemical composition of the sample, the OMA performs infrared spectroscopy using an InGaAs (indium gallium arsenide) sensor. The system measures absorbance from 1550 to 1850nm and quantifies the amount of light absorbed by the sample; the OMA plots this raw data to visualize a high-resolution absorbance spectrum.
The OMA uses a long-life tungsten light source to transmit a signal through the sample fluid in the flow cell. The signal is carried by fiber optic cables from the analyzer to the flow cell, where the chemical mixture of the sample has unique interactions with the light based on its current composition. Learn more
The sample conditioning system for the OMA Wobbe Index Analyzer is a panel designed to achieve quick, automatic, and reliable Wobbe Index readings on pipeline-quality natural gas.
The panel includes the following parts:
Wetted materials for the sample conditioning system include: SS316/316L, viton, PTFE, fused silica.
Note: All performance specifications are subject to the assumption that the sample conditioning system and unit installation are approved by Applied Analytics. For any other arrangement, please inquire directly with Sales.
|Measurement Principle||InGaAs (indium gallium arsenide) infrared spectrometer|
|Detector||nova II™ InGaAs Spectrometer|
|Spectral Range||1550-1850 nm|
|Light Source||Tungsten lamp|
|Signal Transmission||600 μm core 1.8 meter fiber optic cables
Other lengths available
|Sample Conditioning||Wobbe Index Sample Conditioning System
Wetted materials: SS316/316L, viton, PTFE, fused silica
|Analyzer Calibration||Factory calibrated, if possible|
|Human Machine Interface||Industrial controller with touch-screen LCD display running ECLIPSE™ Software|
|Data Storage||Solid State Drive|
|Analyzer Environment||Indoor/Outdoor (no shelter required)|
|Ambient Temperature||Standard: -20 to 35 °C)
Optional: -40 to 60 °C
To avoid radiational heating, use of a sunshade is recommended for systems installed in direct sunlight.
|Sample Temperature||Standard: -40 to 66 °C|
|Voltage||85 to 264 VAC, single phase|
|Power Consumption||45 watts|
|Nitrogen||UHP calibration cylinder|
|Standard Outputs||1x galvanically isolated 4-20mA analog output per measured analyte(up to 3; additional available by upgrade)
2x digital outputs for fault and SCS control
|Optional Outputs||Modbus TCP/IP; RS-232; RS-485; Fieldbus; Profibus; HART;|
|Select analyzer type:||OMA-300 Wall-Mounted Analyzer|
|OMA-206P Portable Analyzer|
|OMA-406R Rackmount Analyzer|
|Standard Design||General Purpose|
|Available Options||ATEX, IECEx, EAC|
|Please inquire with your sales representative for additional certifications (CSA, FM etc.).|