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Carbon VRU Continuous Monitoring

A CEM (Continuous Emissions Monitor) analyzes the vent exhaust of a carbon VRU, ensuring regulatory compliance and optimizing performance. A CIM (Continuous Inlet Monitor) measures incoming vapor, allowing for process control, enhanced automation, and recovery volumes.

  • Fully Integrated

    The CIM and CEM can be fully integrated into existing or new vapor control equipment. The data can be displayed on the customer HMI or SCADA, and data reports can be automatically generated as needed.

  • Models

    • CEM
      • Enclosed
      • Open
      • Standalone
      • Methane Excluding
    •  CIM
      • Ultrasonic
      • Analyzer

  • Engineering and Support

    Our engineering team is ready to help design custom solutions based on unique process needs and can implement fully customized reports. Additionally, we can accommodate customer preferred brands and models of analyzers or other instruments. Cimarron can design custom sample systems.

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Technical Information

Expand sections below to see more information. If you’d like even more details, be sure to check out full Technical Library below.

  • How It Works

    The Continuous Emissions Monitor (CEM) and Continuous Inlet Monitor (CIM) both provide valuable feedback to the operator and allow for enhanced automation of the VRU. A diaphragm pump will pull a sample from the desired location via tubing into the analyzer and push it back out to be returned downstream of the sample location.

    The CEM is used to ensure compliance with applicable air permits and regulations. Cimarron can record and trend the appropriate data to monitor emissions and prove VRU compliance. Automatic daily drift checks ensure that the monitor is properly calibrated. The CEM can be used to save power, as it can allow the VRU regeneration to only run when breakthrough of the carbon bed begins.

    The CIM allows for calculation of the product vapors sent to the VRU and therefore the estimated liquid product recovered. Additionally, it can be used as a power savings device to only run the VRU regeneration when the designed amount of vapors are sent to the carbon bed.

  • Additional Technical Information

    The analyzer most commonly used for both CEM and CIM applications is a non-dispersive infrared (NDIR) spectroscopy analyzer that continually passes an infrared light beam through the sample gas (either from the vent exhaust for a CEM or from the vapor collection manifold for a CIM) while opposed detectors measure the wavelengths of light absorbed by the gas sample. By this method, NDIR analyzers are able to quantify the aggregate total amount of hydrocarbons present in the gas, THC (Total Hydrocarbons), and distinguish what portion of that amount is methane allowing for an output of NMHC (non-methane hydrocarbons) – the emissions generally regulated for a carbon VRU.

Want More Information?

For more documentation on all Cimarron’s products visit the Technical Library.

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