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OMA-

BTX Analyzer

The OMA provides simultaneous analysis of benzene, toluene, xylene, and additional aromatic hydrocarbons using UV-Vis absorbance analysis and powerful spectral de-convolution.

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Performance

  • True BTX Analysis
    Totals individual benzene, tolouene, and xylene measurements using powerful multi-component software
  • Fast, continuous reading
    Analyzer response time is 1 to 5 seconds
  • No false positives
    Interfering chemicals can be corrected for by AAI’s multi components algorithm*
    *Provide sample matrix to AAI for verification
  • Huge dynamic range
    Remains accurate through wide changes in concentration

Reliability

  • Unattended operation
    Stabilized by Auto-Zero; remote operation optional
  • Inherently safe design
    Sample fluid never enters analyzer enclosure Learn more
  • Customizable alarms & outputs
    4-20 mA analog outputs; MODBUS; Hart... View technical specs

Flexibility

  • Measure any BTX concentration range
    From 0-10 ppm to 0-100%
  • Direct analysis of hot/wet sample
    Standard model accepts sample up to 150 °C and 3000 psi

Cost of Ownership

  • No consumables/reagents
    Other than zero gas
  • Proven low-mainentance
    Only requires monthly optics cleaning
  • Long-life xenon light source
    Averages 5 years between replacement
  • Solid state instrument
    Outlasts competing models due to lack of moving parts

Compatibility

  • Hazardous area certifications
    Class I Div 1 & 2; ATEX; GOST... View certifications
  • No shelter required
    Rugged instrument suitable for outdoor installation

Models

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.

Wall-Mount

OMA-300

Wall-mounted process analyzer

  • Indoor/outdoor use
  • ATEX, Class I Div 1/2, GOST...
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Portable

OMA-206P

Suitcase process analyzer

  • Carry from site to site
  • Rugged suitcase enclosure
Learn more
Rackmount

OMA-406R

Rackmount process analyzer

  • Fits standard 19" rack
  • Ideal for lab/shelter
Learn more

Explosion-Proof Models

The OMA-300 is offered in two explosion-proof formats:

Exp (Purged) Explosion-Proof OMA-300

Eexp

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.

Exd (Cast Aluminum) Explosion-Proof OMA-300

Eexd

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.

Applications

Aromatic hydrocarbons like benzene, toluene, and xylene are carcinogenic compounds. This has implications for a wide range of industrial processes: aromatic hydrocarbon emissions are highly regulated, and products like fuel, glue, detergents, and various solvents are required to meet a specified maximum level of aromatic content.

Fortunately, aromatic hydrocarbons have strong absorbance in the UV range and can be easily measured through spectroscopic methods. The laboratory standard ASTM method D1017-51 uses UV spectroscopy for aromatic hydrocarbon analysis; the OMA system takes the same principle and brings it to the field for continuous, fast-response analysis on site.

Using a dispersive UV-Vis spectrophotometer, the OMA BTX Analyzer continuously measures absorbance at each integer wavelength in the 200-300 nm range — the spectral region in which common aromatic hydrocarbons have very prominent, distinct absorbance curves. This allows the OMA BTX Analyzer to easily differentiate the absorbance of each compound from the total sample absorbance.

Proven Applications

Technology

Principle of Operation

To analyze the chemical composition of the sample, the OMA uses an analysis method known as ultraviolet-visible (UV-Vis) spectroscopy. The system measures absorbance from 200nm to 800nm and quantifies the amount of light absorbed by the sample at each integer wavelength; the OMA plots this raw data to visualize a high-resolution absorbance spectrum. Learn more

Spectrophotometer Principle of Operation

The OMA uses a long-life xenon 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

Optical Assembly

Aromatics' Absorbance Spectra

To simultaneously measure benzene, toluene, and xylene, the OMA detects the distinctive absorbance curves of the analytes and mathematically isolates their structures from the total sample absorbance. In accordance with Beer-Lambert Law, the OMA correlates the height of these curves directly to real-time concentrations. The BTX or total aromatics' reading can be configured as a sum of the individual concentrations.

Absorbance Curves: BTX

Benzene
Toluene
Xylene
Absorbance (AU)
Wavelength (nm)

User Interface

Our proprietary ECLIPSE software processes the raw spectral data to provide real-time concentration readings. The operator can easily navigate between views (trendgraph, spectrum, and more) using intuitive touch-screen navigation. You can also configure alarms, data logging, and outputs. Learn more

ECLIPSE software

Inherent Safety

Most analyzers draw the process sample directly into the analyzer enclosure for analysis, which is dangerous if the sample fluid is toxic, explosive, or corrosive. The OMA design is unique: we bring the light to the sample, not the other way around. The sample circulates through the external flow cell, which receives the signal via fiber optic cables. Learn more

Analyzer Safety

Sampling

The OMA is built for direct analysis of the hot/wet sample, thus simplifying the scope of the sample system and retaining high sample integrity. From our vast experience in sampling design, we know that applications can be similar but are rarely identical. For this reason, we design and build sample conditioning systems on a project basis, working from the process to the drawing board.

Specifications

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 Dispersive ultraviolet-visible (UV-Vis) absorbance spectrophotometry
Detector nova II™ UV-Vis diode array spectrophotometer
Spectral Range 200-800 nm
Light Source Pulsed xenon lamp (average 5 year lifespan)
Signal Transmission 600 μm core 1.8 meter fiber optic cables
Other lengths available
Path Length Application-dependent
Sample Conditioning Custom design per application
Analyzer Calibration If possible, analyzer is factory calibrated with certified calibration fluids; no re-calibration required after initial calibration; measurement normalized by Auto Zero
Reading Verification Simple verification with samples and self-check diagnostic
Human Machine Interface Industrial controller with touch-screen LCD display running ECLIPSE™ Software
Data Storage Solid State Drive
OPERATING CONDITIONS
Analyzer Environment Indoor/Outdoor (no shelter required)
Ambient Temperature Standard: 0 to 35 °C (32 to 95 °F)
Optional: -20 to 55 °C (-4 to 131 °F)
To avoid radiational heating, use of a sunshade is recommended for systems installed in direct sunlight.
Sample Temperature Standard: -20 to 70 °C (-4 to 158 °F)
Optional: up to 150 °C (302 °F) with cooling extensions
Contact AAI for temperatures above 150 °C (302°F)
Sample Pressure Using standard flow cell: 206 bar (3000 psi)
UTILITIES
Electrical 85 to 264 VAC 47 to 63 Hz
Power Consumption 45 watts
OUTPUTS
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;
PHYSICAL SPECIFICATIONS
Select analyzer type: OMA-300 Wall-Mounted Analyzer
OMA-206P Portable Analyzer
OMA-406R Rackmount Analyzer
BTX Accuracy
Example ranges below. Custom ranges available.
benzene/toulene/xylene gas sample 0-50 ppm: ±2 ppm
0-100 ppm: ±1% full scale
0-10,000 ppm: ±1% full scale
liquid sample 0-10 ppm: ±0.5 ppm
0-100 ppm: ±1% full scale
0-10,000 ppm: ±1% full scale
Standard Design General Purpose
Available Options ATEX, IECEx, EAC, PESO, JPN, KTL
Please inquire with your sales representative for additional certifications (CSA, FM etc.).

Resources

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