The OMA H2S Analyzer monitors the UV-Vis absorbance in a continuously drawn liquid/gas sample and outputs real-time hydrogen sulfide concentration.Request a Quote
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
Suitcase process analyzer
Rackmount process analyzer
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.
Hydrogen sulfide is toxic at 10 ppm, entirely lethal at 800 ppm, highly corrosive to equipment, flammable when in excess of 4.3% by volume in air, and unpleasantly odorous at a threshold of less than 1 ppb.
Unfortunately, H2S occurs abundantly in fossil fuel reserves and also gets produced by various biological processes. In order to generate clean-burning fuels, prevent acid rain, protect pipelines from corrosion, and keep workers safe from disaster, H2S levels are constantly controlled.
With thousands of units shipped since 1994, the OMA H2S Analyzer has been deployed for a wide range of applications across various industries:
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
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
To measure H2S concentration, the OMA detects the distinctive absorbance curve of pure H2S and mathematically isolates this structure from the total sample absorbance. In accordance with Beer-Lambert Law, the OMA correlates the height of this curve directly to real-time hydrogen sulfide concentration.
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
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
Below we compare the most popular solutions for process H2S analysis.
Click any cell or row for more information.
|Paper Tape||Tunable Diode Laser||Gas Chromatograph||OMA H2S Analyzer|
|Specifications found in product literature from mainstream manufacturers.|
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
|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|
|H2S Accuracy in Liquid|
|Example ranges below. Custom ranges available.|
0-100 mg/L: ±1% full scale or 1 mg/L*
|H2S Accuracy in Gas|
|Example ranges below. Custom ranges available. Accuracy may be higher at higher pressure.|
0-10 ppm (@1 bar): ±1 ppm (Increased pressure will yield increased accuracy); ±0.2 ppm (@5 bar)
0-100 ppm: ±1% full scale or 1 ppm*
0-10,000 ppm: ±1% full scale
0-100%: ±1% full scale
|Standard Design||General Purpose|
|Available Options||ATEX, IECEx, EAC|
|Please inquire with your sales representative for additional certifications (CSA, FM etc.).|