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OMA-

Color Analyzer

Benefiting from the stability of full-spectrum analysis, the OMA Color Analyzer provides extremely reliable sample color analysis; this system is an ideal colorimeter for hydrocarbon fuel streams (e.g. diesel, naphtha).

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Performance

  • 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 sharp changes in sample opacity

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

  • Various scales available
    ASTM D-1500, APHA, Saybolt, Rosin... see list
  • Direct analysis of hot/wet sample
    Standard model accepts sample up to 150 °C and 3000 psi
  • Bubbling-proof measurement
    Full-spectrum analysis easily removes erroneous wavelengths

Cost of Ownership

  • No consumables/reagents
    Other than zero fluid
  • 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...
Learn more
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

The color of liquid in a process streams is often observed as an indicator of potential problems with product quality or equipment. Subtle changes in process coloring can signify a variety of issues, including dips in process efficiency, overheating, floating dilution ratios, distillation column malfunction, and equipment failure (e.g. leaky heat exchangers or filter breakdown).

Human judgment on color is subjective and variable. The common photometric detectors is dependent on a single, isolated measurement wavelength — a method susceptible to distortion from bubbling, contamination, or wavering light levels, as all of these conditions are misrepresented in readings as color changes.

Available Color Scales

Proven Applications

  • beverage production
  • diesel
  • gasoline
  • heavy distillate
  • kerosene
  • LNG
  • naphtha
  • natural gas liquids
  • quality control
  • wastewater

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 wavlength; 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

Color Absorbance Spectrum

Example: the APHA color of a sample (e.g. wastewater) corresponds directly to the height of the sample's absorbance curve in the 425-445nm wavelength region. The OMA monitors this region to determine the real-time sample color in the APHA scale. The system is calibrated using the absorbance of distilled water to represent APHA 0 and a 500 ppm PtCo stock solution to represent APHA 500.

Absorbance Curve: APHA Scale

Wastewater
APHA
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 Vis/NIR absorbance spectrophotometry
Detector nova II™ Vis/NIR diode array spectrophotometer
Spectral Range 200-800 nm
Light Source Tungsten lamp (average 2 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)
Using immersion probe: 100 bar (1470 psig)
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
Response Time 1-5 seconds
Repeatability ±0.5% of scale
Noise ±0.004 AU at 220 nm
Standard Design General Purpose
Available Options ATEX, IECEx, EAC
Please inquire with your sales representative for additional certifications (CSA, FM etc.).

Resources

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