Differential Optical Absorption Spectrometer (DOAS)

Model 3000 DOAS
RELIABLE, ACCURATE AND EPA COMPLIANT CEMS UTILIZING NON-INTRUSIVE CROSS STACK DIFFERENTIAL OPTICAL ABSORPTION SPECTROMETER (DOAS) TECHNOLOGY

Model 3000 DOAS is a continuous monitor designed to measure flue gases for both compliance and process monitoring. The Controller uses a Differential Optical Absorption Spectrometer (DOAS) System for unsurpassed accuracy and performance. The measurements are made in-situ across the stack or duct in a single pass design. A Windows based software package is available to display the data on either a Host laptop PC or the client’s existing data acquisition system.

Up to 4 simultaneous measurements including
SO2, NO, NOX, NO2, NH3, HCHO, SO3, O3 Benzene, and Toluene in a
Cross Stack Configuration
For Compliance or Process Monitoring
Can also be combined with the CEMTEK TDLS Model 7000
Other gases are required

  • Ultra-high accuracy and sensitivity
  • Cross-stack non-intrusive
  • No parts located in process stream
  • No corrosion
  • No particulate buildup on probe
  • Do not have to pull heavy analyzer off from stack port
  • Immediate response time
  • Minimal maintenance and consumable parts required
  • Clean optics enclosure windows periodically
  • Meets and or exceed EPA performance specifications,
  • Calibration and Certification/RATA requirements per 40CFR Part
  • 60 regulations
  • Compact and easy to install and operate
  • Low operating costs

CEMTEK KVB-Enertec DOAS Brochure

Fully Extractive CEMS

CEMTEK offers custom-built Fully Extractive CEMS containing state of the art components manufactured to your application’s unique specifications. Our technicians will work one on one with you to design, engineer, construct, deliver and install your tailor made product.

Sample probe tubes are stainless steel (hastelloy is optional). The filter housings are heated with two easy to clean micron filters.

Isolation valves are installed for intervaled purging to keep the probe from plugging and to create a more efficient use of daily calibrations gases.

This is also an invaluable tool for maintenance, allowing for easy “leak check” of the sample system. The heated sample line keeps the sample above the dewpoint to keep it from condensing.

Sample line packages include: 2 – 3/8” lines for sample and instrument air, 2 – ¼” lines for cal gas and isolation valves as well as all necessary power and signal wires.

For most applications PFA Teflon is utilized, another option is stainless steel for low NOx and CO projects.

Sample probe and sample line RTD’s are also installed to warn of loss of heat, which may degrade the sample or reduce the life of equipment.

The sample conditioner is a refrigerant type gas compressor cooler. Here the sample is chilled and dried preparing it for analysis. An integral moisture sensor alarm and secondary filter is also installed as a failsafe downstream of the conditioner.

Pressure regulators with gauges and flow meters control the flowrates to individual analyzers. An RTD is also installed at the cooler exit to ensure the proper temperature is maintained. This is an excellent maintenance feature and also required by some regulatory agencies.

The sample conditioner is a refrigerant type gas compressor cooler. Here the sample is chilled and dried preparing it for analysis. An integral moisture sensor alarm and secondary filter is also installed as a failsafe downstream of the conditioner.

Pressure regulators with gauges and flow meters control the flowrates to individual analyzers. An RTD is also installed at the cooler exit to ensure the proper temperature is maintained. This is an excellent maintenance feature and also required by some regulatory agencies.

Cemtek can supply almost any brand of gas analyzers and incorporate them into our CEMS. We use all the major brands and have 50 years of experience adding them to our CEMS.
Analyzers are system & application specific and are selected to provide the most accurate performance with minimal downtime or issues. We fully support all the analyzer brands we sell.

The CEMS is controlled by our SEAL Controller which replaces the PLC or we can use Allen Bradley & other PLC’s.
Our CEMS Data Acquisition & Handling System (DAHS) is a proprietary software product that exceeds all CEMS DAHS requirements specified by Part 60, 75 and all federal & state regulations. We can also supply other brands of DHAS products.

We are the CEMS service experts. We can service almost any brand of gas analyzers and CEMS, even those built by all other CEMS companies. We’ve designed our CEMS with the service technician in mind. This allows for ease of maintenance, reduced downtime and guaranteed certification, year after year. With sample system components easily accessible, it’s easy to follow your EPA QA/QC plan. CEMTEK is there for start-up, training, certification and long term maintenance. Our parts experts are always available to meet all your CEMS parts needs and ensure accurate, reliable reporting.

Fully Extractive CEMS Brochure
CEMTEK KVB-Enertec NetDAHS Edge Cut Sheet
CEMTEK KVB-Enertec – SEAL Brochure

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