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TSA-100 Total Sulfur Analyzer main view

Total Sulfur Gas Analyzer

The TSA-200 uses conventional pyrolysis techniques for converting all sulfur compounds in the sample to sulfur dioxide. The system uses a high-performance UV-Vis spectrophotometer to measure the resulting SO2 concentration, which correlates to total sulfur.

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  • Combustion-Style Total Sulfur Analysis
    Sampling system pyrolyzes sulfur compounds to SO2
  • Fast, continuous reading
    Analyzer response time is 1 to 5 seconds
  • Huge dynamic range
    Remains accurate through wide changes in concentration


  • Unattended operation
    Stabilized by Auto-Zero; remote operation optional
  • Inherently safe design
    Sample fluid never enters analyzer enclosure Learn more
  • Customizable alarms & outputs
    4-20 mA analog outputs; MODBUS; Hart... View technical specs


  • No shelter required
    Rugged instrument suitable for outdoor installation with sunshade


Sulfur compounds--particularly hydrogen sulfide--in natural gas carry with them a host of problems and considerations for both producer and consumer. Sulfur content is known to:

  • Cause pipeline corrosion, jeopardizing distribution networks and necessitating complex maintenance regimens
  • Officially reduce the quality of sales gas; natural gas quality assurance involves monitoring of sulfur content, e.g. at custody transfer points
  • Contribute directly to SO2 emissions from gas-burning plants; SO2 is a widely regulated pollutant and a necessary concern for avoiding fines and fulfilling social responsibility
  • Introduce unpleasant odors to gas-dependent industrial and domestic environments; mercaptans are added to natural gas to make leaks noticeable by smell, but uncontrolled sulfur content turns the odor from useful to intolerable

Avoiding these chronic sulfur-related issues requires reliable online monitoring of total sulfur load in gaseous hydrocarbon streams. The only way to verify the efficiency of sulfur removal processes and ensure satisfaction of customer and environmental needs is to proactively analyze stream composition.

The TSA-200 is a fully integrated monitoring solution driven by UV-Vis diode array detection. This solid state instrument is a much more practical than the consumable-laden designs that have historically dominated the market.


Principle of Operation

The TSA-200 uses an ultraviolet-visibile (UV-Vis) spectrophotometer to measure the resultant SO2 concentration after pyrolysis. This method is known to be highly resistant to false positives; full-spectrum analysis quickly removes erroneous data using averaging algorithms.

Spectrophotometer Principle of Operation

The TSA-200 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.

TSA-200 Optical Assembly

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

Inherent Safety

The TSA-200 has an inherently safe design because the toxic sulfur-laden sample does not enter the analyzer enclosure. The sample circulates through the external flow cell, which receives the signal via fiber optic cables.

total sulfur analyzer safety


The TSA-200 sample conditioning system is designed primarily for controlled combustion of the sample.

Upon entering the TSA-200, the sample is split via tee into a bypass loop and a sample loop. In the sample loop, two mass flow controllers are used to accurately mix the sample with air, ensuring an optimal air/fuel ratio for combustion.

The sample/air mixture flows through a pyrolysis furnace, where all present sulfur compounds are converted to sulfur dioxide:

R-S + R-H + O2 > SO2 + CO2 + H2O

The fully oxidized sample then enters the measurement flow cell where SO2 absorbance is monitored (via fiber optic cables). Finally, the sample exits the system as waste.


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
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 The SCS utilizes mass flow controllers to continuously mix the sample gas with air at a precise fuel:air ratio. The system passes the resultant mixture through a furnace tube. Post-combustion, the stream absorbance is measured.
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.
Electrical 85 to 264 VAC 47 to 63 Hz
Power Consumption Per system
Standard Outputs 3x galvanically isolated 4-20 mA analog output per measured parameter
1 digital fault alarm
1 digital input
1 k type ungrounded thermocouple input
4x relay outputs
Additional outputs available by upgrade
Optional Outputs Modbus TCP/IP; RS-232; RS-485; Fieldbus; Profibus; HART;
Size Analyzer: 24" H x 20" W x 8" D (610 x 508 x 203 mm)
SCS: 36”H x 36”W x 12” D (914mm H x 914mm W x 305mm D)
Weight Analyzer: 32 lbs. (15 kg)
SCS (if included): per system
Enclosure Standard: wall-mounted carbon steel NEMA 4 enclosure
Photometric Accuracy ±0.004 AU
Application Accuracy Dependent upon application. Please inquire with Sales.
Standard Design General Purpose
Available Options ATEX, IECEx, EAC
Please inquire with your sales representative for additional certifications (CSA, FM etc.).


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