The OMA is an industrial device which measures a high-resolution absorbance spectrum in a continuously drawn sample from a liquid or gas process stream. Harvesting this rich data, the OMA provides real-time analytics for the process stream, including chemical concentrations, purity, and color.
Chemical concentrations The OMA can simultaneously monitor up to five chemicals in the sample stream. All analytes must have distinct absorbance curves in the wavelength range of the OMA.
Chemical purity By measuring a high-resolution transmittance spectrum, the OMA can very precisely detect impurities in the sample fluid by sudden changes in the spectral structure.
Physical properties Various properties such as the heating value of a fuel or the octane of a gasoline blend can be powerfully correlated to the absorbance spectrum of the sample.
The OMA is used to measure hundreds of different chemicals across various industries. The instrument is versatile because it acquires a full absorbance spectrum — and many chemicals have absorbance features in that region.
To analyze the chemical composition of the sample, the OMA uses an analysis method known as absorbance spectroscopy. Depending on the target chemicals for analysis, the OMA uses either UV-Vis (200-800nm), SW-NIR (400-1100nm), or InGaAs (1550-1850nm) sensors in its spectrophotometer. The system measures absorbance across its wavelength range 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.
The OMA uses a long-life xenon or 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.
The heart of the OMA is the nova II diode array spectrophotometer. This device contains the light source as well as the detector which measures the absorbance spectrum. There are three versions of the nova II: ultraviolet-visible (UV-Vis, 200-800nm) shortwave near-infrared (SW-NIR, 400-1100nm), and InGaAs (indium gallium arsenide, 1550-1850nm).
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.
The OMA can be configured to measure up to 5 chemicals simultaneously. The system uses a de-convolution algorithm which separates the absorbance curve of each analyte from the total sample absorbance by solving a regression matrix sourced from hundreds of diodes (one per integer wavelength).
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.
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.
|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
|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;|