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).
The color of liquid in a process stream 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 detector 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.
The OMA system continuously measures sample color using full-spectrum visible absorbance spectrophotometry. The photodiode array measures absorbance at every single integer wavelength in the visible range from 340 to 720 nm; the ECLIPSE software uses this rich collateral data to secure the measurement against the typical distorting phenomena.
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.
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 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.
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
|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|
|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)
|Electrical||85 to 264 VAC 47 to 63 Hz|
|Power Consumption||45 watts|
|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|
|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.).|