Continuous Emissions Monitoring Systems
With 25 years experience, we are the cems experts
Thomson Environmental Systems offer a wide variety of custom-made solutions to meet your site-specific Continuous Emissions Monitoring requirements.
We offer Insitu, Direct extractive and Dilution extraction systems, providing reliable, low maintenance systems to meet challenging applications such as TRS, VOC, HCL and NH₃ monitoring as well as value monitoring solutions for CO, NOx, SO₂ and more.
For reliable data and operation year after year, we integrate trusted, well-known brands such as Teledyne API, DURAG, Gasmet, Optical Scientific, Enotec, Auburn Systems, Tiger Optics and other quality components.
Systems are equipped with accessories for CEMS housing and calibration; including probe spiking, system alarms, probe blow-back and options for high temperatures up to 1200-1400C, O₂ & H₂O monitoring, data collection and reporting to Australian State, US EPA and European regulations.
Here's how we can help:
Systems Engineering and Integration
TES supply complete system solutions. Our team of engineers and instrument technicians are available to discuss your stack and process monitoring application, recommend equipment and design and engineer unique turnkey systems to meet your specific needs.
Our range includes unique technologies such as optical scintillation and FTIR, allowing us to measure effortlessly where measurement has not been possible before.
- Insitu, Direct Extractive & Dilution Extraction Gas Analyser Systems
- Insitu Dust/Opacity Analysers
- Insitu Flow/Velocity Sensors
- System Design & Integration
- Sample Probes & Lines
- Sample Clean Up Units
- Calibration Equipment
- Data Logging and Recording
- Air-Conditioned Cabinets & Walk in Shelters.
Reliable + Durable, quality assured
TES supply low maintenance, high quality gas, flow/velocity and dust/opacity monitors for the toughest on-site conditions. All system components are thoroughly tested and system operation is verified and documented during Factory Acceptance Testing.
Testing and Wiring
All wiring, labelling and plumbing is performed by experienced professionals to meet or exceed your requirements.
|Gases||CO||CO₂||SO₂||NH₃||HF||NO, NO₂, NOX|
|Over 300 more|
|Dust||Opacity||Dust mg/m³||Broken Bag Detection|
|Flow / Velocity||Ultrasonic, Optical Scintillation or Pitot|
|Industries Served||Gas & Coal Fired Power Plants||Manufacturing Plants||Refineries|
|Research Facilities||Paper Mills||Waste to Energy Plants|
|SynGas||Steel Industry||Food Industry|
|Sewage Treatment Plants||Boilers|
types of Continuous Emissions Monitoring Systems
CEMS consist of numerous components that are capable of determining particulate, gas concentration and flow or the rate of emission of certain pollutants. Results are produced through analyses of measurement and also software.
CEMS are primarily classified according to the approach taken towards probe mounting: In-situ or extractive. With extractive systems, the analyser and probe are separated while the system removes and conditions the gas sample before it’s sent to the analyser in order to determine the contents. In-situ systems consist of mounting the analyser on the stack and the analyser then being in direct contact with the sample gas, which removes the need to condition the sample.
InSitu Gas CEMS
- No cross-interference
- Fast response, less than 1 second
- Diverse optical length (0.5-20m)
- Install base of over 8000 instruments worldwide
- International ATEX Certified.
FPI’s Single Gas Analyser (LGA) utilises Tunable Diode Laser Absorbtion Spectroscopy (TDLAS). The LGA System can accurately measure in harsh environments and is virtually maintenance free.
Direct Extractive & Dilution Extractive Continuous Gas Analyser Systems
- Turnkey gas monitoring systems for process and emission monitoring
- Custom design to suit your site requirements
- Reputation for quality systems that hold up in harsh environments, including corrosive gases such as TRS & H2S Applications
- Locally integrated and supported
Dilution Extraction Systems utilise an eductor-style dilution probe, non-heated sample line and Teledyne API or Tiger Optics Ambient analysers, proving accurate stack gas measurements while minimising maintenance in corrosive environments.
Direct Extraction Systems offer a simple, economical option utilising heated probe, heated sample line, sample conditioning system, probe blow back (if required) and Teledyne API Medium and High Level analyser.
Gasmet FTIR analysers are also available for mutli-gas analysis.
Insitu Dust/Opacity Analysers
TES partner with various suppliers of reliable Dust and Opacity Monitors. Including:
- to meet US EPA PS 1 or TUV requirements
Laser Dust Monitor
- Low maintenance, low calibration requirements, economical option
- mg/m3 or Opacity output
Triboelectric Bag Leak and Dust Monitor
- Bag leak detectors and solids flow monitors to monitor and measure dust, powders, and bulk solids for environmental and process control applications.
Insitu Flow/Velocity Sensors
TES offer Pitot Tube, Ultrasonic and Optical Flow Sensor technologies for Flow/Velocity Monitoring.
The Optical Flow Sensor (OFS) manufactured by OSI is a continuous flow measurement system for small and large stacks and ducts.
Advantages of Optical Scintillation flow measurement include:
- Temperature, pressure and humidity have no impact on the measurement
- Instrumentation is installed at a 90° angle to the gas flow, needing only one platform to access, rather than potentially two on smaller stacks
- It is a true non-contact instrument – nothing protrudes into the stack. The instrument is very rugged, they are even installed in flare stacks! And normally there is no need for blowers unless it is a really dirty application.
- Measurements are drift free
- Measurement is across the entire stack (rather than one point when a pitot is used)
- Path length and opacity do not affect the measurement
- Compliant with US EPA 40CFR 60 and 75
- Very low maintenance and ongoing cost of ownership (no consumables).
Several regulatory bodies around the world, across a host of different sectors require the reporting of environmental pollutant emissions which can be done through an emission monitoring system. CEMs continuous emission monitoring systems refer to the category of equipment utilised for this monitoring, generally required by or approved by these various aforementioned governing authorities. Alternatively, authorities may also permit a predictive monitoring system for particular applications in place of CEMS. Do you want to say this? We don’t supply PEMS.
Components Of Continuous Emission Monitoring Systems
Monitoring generally refers to the ongoing process of collecting and using measurement information or other data to evaluate performance against a status or standard. When it comes to regulatory requirements relating to air quality, monitoring consists of ambient and stationary source monitoring.
Ambient monitoring refers to the collection and measurement of ambient air samples to assess the air pollutants within the atmosphere in comparison to standards of clean air. Stationary source monitoring is in reference to the collection and use of measurement data at stationary emission sources, such as manufacturing plants and facilities. This is to evaluate the level of air pollutants being emitted from processes/work practices and assessing the performance of control devices for emissions in that particular environment.
The components of a continuous emissions monitoring system may include, emission analysers, sample lines, sample probes, sample conditioners, calibration gases, analyser shelters, reporting software and more. A total CEMS is, in practice, typically purchased via an integrator for systems, responsible for designing and assembling the system based on requirements. Since they’re customised, the combination of options for CEMS are virtually limitless.
Every continuous emission monitoring system is built in compliance with certain regulations that are known as performance specifications or methods. While clients may not always make the conscious choice to install an emissions monitoring system themselves, CEMS are often required to comply with these regulations and any additional requirements that may be deemed necessary.
While there are numerous types of continuous emission monitoring systems, the most common process is when the non-diluted component of exhaust gas has been extracted from a stack via a gas sample and sent through conditioning systems before analysis by the emissions analyser.
The purpose of air quality regulations are to try and reduce the types and amount of air pollutants released into the environment. The measurement of these air pollutants is something that many people may not be familiar with. There are different ways to approach this, including point in time sampling and extrapolated figures on a long-term basis. The other approach is continuous emissions monitoring as an ongoing process.
Usually monitored pollutants can include both toxic pollutants or criteria pollutants. Some of the pollutants that are examined include carbon monoxide, carbon dioxide, , nitrogen dioxide, nitric oxide, sulfur dioxide, Hydrogen Sulfide, Total Reduced Sulfure, VOC’sand particulate matter.
Toxic air pollutants are hazardous and classified as a cause of major health problems. Air quality regulations and programs specify which pollutants are regarded as toxic and dangerous.
Monitoring data is essential in assessing air quality trends and assessing the effect of pollution generated in the environment. Monitoring aims to evaluate the atmospheric status and provide information about air quality to the public, industry, scientists and regulators. CEMS allow operating facilities to provide data to regulatory bodies to prove they are meeting their operating licence requirements and not exceeding emission limits. CEMS can also be beneficial to process operation efficiency.