Beijing Qinglian Measurement and Control Technology Co., Ltd

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Beijing Qinglian Measurement and Control Technology Co., Ltd

Tel：18500242456
Email：sales@qingliancekong.com

Address: Inside Beijing Taixing Art Institute, Shuipo Village, Gaoliying Town, Shunyi District, Beijing

OMA Sulfur Dioxide SO2 Online Analysis

Using the principle of ultraviolet absorption to measure sulfur dioxide, all-spectrum absorption technology can effectively shield against other interfering substances, providing a reliable guarantee for the precise measurement of sulfur dioxide. The all-solid-state design, with no moving parts and a long-life pulsed xenon lamp source, ensures long-term measurement stability while eliminating the hassle of frequent spare-part replacements and the need to maintain an extensive inventory of spare parts.

Product Features

Technical concept

Monitoring Principle

The OMA-300 sulfur dioxide online analyzer uses the ultraviolet absorption principle to determine the concentration of sulfur dioxide in a sample. The OMA-300 measures the absorbance of the sample over a wavelength range from 200 nm to 800 nm, and an array diode detector converts the optical data into signals that are sent to a processor for data analysis, yielding a high-resolution absorption spectrum.

Optical structure

The pulsed xenon lamp source emits an optical signal, which is transmitted via optical fiber to a flow cell where it comes into contact with the gas being measured. The signal then exits through another optical fiber and enters the spectrometer’s detector for data processing.

Sulfur Dioxide Absorbance Spectrum Chart

To detect the concentration of sulfur dioxide, OMA identifies the unique absorption spectrum of pure sulfur dioxide and uses mathematical methods to separate and isolate the sulfur dioxide absorption spectrum from that of the sample being measured. Based on Beer-Lambert’s law, OMA correlates the distinctive sulfur dioxide absorption spectrum with the actual sulfur dioxide concentration.

Instrument structure

The OMA-300 features an all-solid-state design with no moving parts and no consumables. Its key components include an HMI industrial PC and a NOVA second-generation spectrometer. The HMI industrial PC is equipped with an 8-inch LCD touch screen and runs on the Windows operating system, providing convenient operation for service personnel.

User interface

AAI’s proprietary ECLIPSE software processes the acquired spectral data into actual concentration readings. On the touchscreen controller, the analyzer operator can easily switch between different interfaces—such as trend graphs, spectra plots, concentration readings, and more—and can independently and at any time set and adjust alarms, outputs, purge functions, zeroing, and other parameters.

Safety performance

Most analyzers directly introduce the sample into the analyzer’s housing for measurement. However, if the sample is toxic, highly corrosive, or explosive, this could be extremely dangerous. The OMA design is unique: instead of introducing the sample into our analyzer, we guide the optical signal into the sample itself. The sample flows only through a flow cell and never comes into contact with the analyzer. The flow cell is connected to the analyzer via an optical fiber cable.

Installation method

OMA products of various models share the same electronic architecture, and their monitoring functions and performance are identical. The differences among these models lie in their external structural designs and the materials used, with the aim of meeting the diverse requirements of different applications.

Sample system

U.S. AAI offers a unique, personalized pre-processing system service that provides tailored solutions for various applications involving sulfur dioxide (SO2). For more details, please contact U.S. AAI sales.

Technical Parameters

The following technical specifications are based on the premise that all components and the sample system are supplied by AAI, and that the system installation has been approved by AAI. For technical specifications under other conditions, please consult AAI’s sales team directly.

General

Operating environment
Measurement principle	Dispersion Ultraviolet-Visible Spectrophotometry
Detector	nova II™ UV-Vis Diode Array Spectrometer
Spectral detection range	200–800 nm
Light source	Pulsed xenon lamp light source, with a service life of five years.
Signal transmission	600-micron core, 1.8-meter-long optical cable; other lengths available upon request.
Sample Preprocessing	Custom-designed for different applications
Analyzer calibration	Before leaving the factory, the instrument is calibrated using a standard gas that has been certified by the manufacturer; users do not need to calibrate it again. The system’s accuracy is ensured by an automatic zeroing function.
Reading verification	Quickly and easily verify using standard samples and self-diagnosis functions.
Controller	Industrial controller equipped with an LCD touch screen and ECLIPSE™ operating software.
Data storage	Pure solid-state drive
Analyzer environmental conditions	Suitable for both indoor and outdoor use; no analysis cabin required.
Ambient temperature	Standard: 0 - 35 °C (32 - 95 °F)
	Optional: -20 to 55 °C (-4 to 131 °F)
	To avoid thermal radiation, it is recommended to install the analyzer under a sunshade in environments with direct sunlight.
Sample temperature	Standard: -20 – 70 °C (-4 – 158 °F)
	Optional: When equipped with a cooling extension, the maximum temperature can reach up to 150 °C (302 °F).
	If the temperature exceeds 150 °C (302°F), please contact AAI.
Sample pressure	Standard flow cell: 206 bar (3000 psi)
	Insertion probe: 100 bar (1470 psig)
Power requirements
Electricity	85 - 264 VAC 47 - 63 Hz
Power consumption	45 watts
Output
Standard output	One measured substance corresponds to one 4-20 milliamp analog output (up to three channels are available; additional options available after upgrade).
	Two digital outputs correspond to alarm and pre-processing control.
Optional output	Modbus TCP/IP; RS-232; RS-485; Fieldbus; HART
Appearance features
Select the analyzer housing	Explosion-proof cast aluminum enclosure Eexd
	OMA-406R Rack-Mounted

Measurement parameters

Measurement range	The range is adjustable; common ranges are as follows: 0-100 ppm; 0-400 ppm; 0-2500 ppm; 0-1%; 0-10%
Accuracy	Less than 1% of full scale
Repetitiveness	±0.4% of full scale
Response time (T90)	Less than 5 seconds (analysis cycle less than 1 minute)
Detection limit	Less than 1% of full scale
Linearity	Less than 1% of full scale
Repetitiveness	0.4% of full scale
Sensitivity	Less than 1% of full scale
Zero-drift	Less than 0.1% per 24 hours after instrument warm-up.

Explosion-proof certificate

Standard configuration	Wall-mounted explosion-proof cast aluminum enclosure, explosion-proof rating ExdIICT6, protection rating IP65/IP66
Optional	ATEX, IECEx, EAC, PESO, JPN, KTL