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Process Analyzer

Continuously measure the chemicals in a liquid or gas process stream using the future of industrial process analytics: the OMA.

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What is the OMA?

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.

What does the OMA measure?

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. Search for a measurement

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.

fast response

Fast, continuous reading in under 10 seconds

no moving parts

No moving parts or consumables other than zero fluid

rich trend data

Rich trend data and customizable interface


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-mounted process analyzer

  • Indoor/outdoor use
  • ATEX, Class I Div 1/2, GOST...
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Suitcase process analyzer

  • Carry from site to site
  • Rugged suitcase enclosure
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Rackmount process analyzer

  • Fits standard 19" rack
  • Ideal for lab/shelter
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Explosion-Proof Models

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

Exp (Purged) Explosion-Proof OMA-300


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 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 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.

Application Index     Measurement Index


Principle of Operation

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. Learn more

Spectrophotometer Principle of Operation

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. Learn more

Optical Assembly

nova II Spectrophotometer

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). Learn more

nova II Spectrophotometer

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

Multi-Component Analysis

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). Learn more

Multi-Component Analysis

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


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 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
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)
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

Measurement accuracy for the OMA Process Analyzer depends on the application and stream composition. Select an application for specific accuracy.

Response Time 1-5 seconds
Zero Drift ±0.1 % after 1hr warm-up, measured over 24hrs (constant ambient temperature)
Sensitivity ±0.1 % full scale
Noise ±0.004 AU at 220 nm
Standard Design General Purpose
Available Options ATEX, IECEx, EAC, PESO, JPN
Please inquire with your sales representative for additional certifications (CSA, FM etc.).


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