Extractive Measurement (EMX) Cell Assembly

Laser Based – In-Situ Monitoring

Measurement Head Breakout

Understanding the components

To best understand if this Measurement Head is ideal for your application, it vital to understand what is included.

The Extractive Measurement (EMX) Cell Assembly has the following configurable options:

  • Process Pressure: There is a spectroscopic limitation on pressure to 100 kpag (15 psig).
  • Process Temperature: There is a spectroscopic limitation on temperature to 150C (300F).
  • Other Process Conditions: In general, the gas following through the Extractive Measurement (EMX) Cell should be both clean and dry as to not foul the windows.
  • Material of Construction: The Wetted Process material can either be Stainless Steel of Hastelloy.
  • Path Length Options:  The 1″ NPT Wetted Process Pipe is available in lengths of: 1m, 0.5m or No Pipe included.

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  • How It Works

    How It Works

    Visualization Representation

  • Ease to Maintain

    Ease to Maintain

    Replaceable Window Kit

    The Extractive Measurement (EMX) Cell includes the following field replaceable Window Kit:

    • Sapphire Window + Gasket:  The kit BL-EMX-WK includes two (2) Sapphire Windows and two (2) Gaskets.
    • Easy Replacement: Once the Transceiver-Cover and Retro-Cover have been removed, it is simply four (4) Alan Keyed Screws that affix the Retainer Ring to the Window Figures that enable the replacement of the Sapphire Window and Gasket.
  • Extractive Measurement (EMX) Cell

    Extractive Measurement (EMX) Cell

    The Components and their Function

    The Extractive Measurement (EMX) Cell Assembly has the following configurable options:

    • Transceiver Cover: Houses the Launch (Transmitting) and Collecting (Receiving) Optical Components where the Fiber Optic and CAT6/5e Cables are connected.
    • Retro Cover: The Retro-Cover returns the emitted Laser Light back towards the Transceiver Cover.
    • Sapphire Windows: The selected Sapphire Window allows the emitted Laser Light to pass through unobstructed and to contain the process.
    • Material of Construction: The Wetted Process material can either be Stainless Steel of Hastelloy.
    • Path Length Options:  The 1″ NPT Wetted Process Pipe is available in lengths of: 1m, 0.5m or No Pipe included.

    The Optical Bench includes the following components:

    • Optical Bench: This formulates the Transceiver Configuration that combines the Transmit and Receive functionality in one efficient enclosure. The Optical Bench can slide back out of the Extractive Measurement (EMX) Cell Enclosure for easy termination of the Single Mode Fiber Optic (FC/APC Connectors) and Shielded CAT6/5e (RJ45 Connectors) Cables.
    • Launch Optics: The Laser Light that travels from the GasFinder via Single Mode Fiber Optic Cabling is Collimated within the Optical Bench and launched from the hole on the Collecting Optics.
    • Collecting Optics: When the Laser Light is returned from the Retro-Reflector the Collecting Optics focus the Laser Light onto the Photodiode.
    • Photodiode: The Photodiode converts the collected Laser Light into a small electrical signal where the GasFinder will perform its Absorption Spectroscopy technique to very accurately and reliably determine the Path Integrated Concentration within the Active Measurement Path.

    The Optical Bench includes the following components:

    • Optical Bench:  The Optical Bench can slide back out of the Extractive Measurement (EMX) Cell Enclosure for easy termination of the Single Mode Fiber Optic (FC/APC Connectors) and Shielded CAT6/5e (RJ45 Connectors) Cables.
    • RJ45 Connector: The small electrical signal from the Photodiode is carried to the GasFinder for analysis via Shielded CAT6/5e Cabling.
    • FC/APC Connector: The Laser Light is carried from the GasFinder to the Extractive Measurement (EMX) Cell via Single Mode Fiber Optic Cabling.
    • Patch Cable Connection: As part of the Extractive Measurement (EMX) Cell Assembly, the fittings and lengths of cabling are included.

    The Alignment of the Extractive Measurement (EMX) Cell includes:

    • Goals of Optimization/Adjustment: The goal of the Alignment Optimization and Adjustment are to obtain the highest possible Received Light Level (Rx) available.
    • Alignment upon Installation: Upon installation of the Transceiver Cover, there should be at least some Received Laser Light (Rx) and there will only need to be an alignment optimization adjustment needed.
    • Two (2) Adjustment Hex Screws:  The Transceiver Cover includes both the Launch (Transmitting) and Collection (Receiving) Optics and only the Transceiver Cover needs to be have it alignment optimized and/or adjusted.
  • Maximize Measurement Up-Time

    Maximize Measurement Up-Time

    Option #1 – Use Spare Window Fixtures

    By utilizing redundant Window Fixtures, you’ll be able to outmaneuver the inevitable:

    • By far, the Largest Failure Mode:  Will be the windows becoming fouled or obstructed.
    • The Windows will eventually Foul: Even with the best Sampling Conditioning possible, it is a matter of when the windows will dirty, not if.
    • Cost Effective Sampling Redundancy: By simply implementing a Spare Window Fixture within your Sampling Design.
    • Fast, Easy, and Painless Intervention: When the windows in one of the Window Fixtures foul, simply move the Transceiver Cover and Retro Cover to the clean Spare Window Fixture and then get around to cleaning the easily accessible windows when you have time.

    Option #2 – Use Multiple Extractive Measurement (EMX) Cells

    By utilizing redundant Extractive Measurement (EMX) Cells, in the case of a fouled/dirty window, you’ll be able to:

    • Quickly Return to Operation:  By tubing in two Extractive Measurement (EMX) Cells, it will be the simple turns of valves to isolate/bypass the extractive process stream to the second (and clean windowed) Extractive Measurement (EMX) Cell.
    • Easy on the Maintenance Planner: Once the EMX #2 Cell (Secondary) is brought on-line, then there is plenty of time for the maintenance time to either clean or replace the dirty windows in EMX #1 (Primary).
  • Building your Sample Conditioning System

    Integration and Use

    Building Your Sample Conditioning System

    Below are a number of tips and tricks that can be used to best integrate the Extractive Measurement (EMX) Cell:

    • Select the Appropriate Path Length:  Often the path length of the Extractive Measurement (EMX) Cell is dictated by two items: 1) Detection Range Requirements & 2) Physical Space Limitations. For more Detection Range information, Click Here to see the “In-Situ and Extractive Gas Analysis” section.
    • Temperature & Pressure:  The sample being inputted to the Extractive Measurement (EMX) Cells must be within the operating parameters for the spectroscopic measurements to work. For best results, should be between –55°C to +150°C (-67 to +300°F) and 50 to 200 kPa Absolute (7.25 to 29 psia).
    • Filters & Knock-Out Pots:  Since the laser beam cannot transmit through liquids, the Extractive Measurement (EMX) Cell will not be able to generate concentrations measurements in the cell is filled with liquid. It is very important to ensure your sample conditioning system removes condensed liquids before they enter the Extractive Measurement (EMX) Cell.
    • Angled Installation: If condensed liquids do get past the filters and knock-up pots, it may be a good idea to install the Extractive Measurement (EMX) Cell on an angle to allow the liquids to drain.
    • Heat Trace or Heated Enclosure: The goal of the sample conditioning system is to keep the windows of the Extractive Measurement (EMX) Cell clean. With the use of Heat Trace or being installed in a Heated Enclosure, this will help to prevent and/or mitigate condensation from forming on the windows and blocking the laser light.
    • Allow Room for Transceiver/Retro-Covers to be Removed: During the design of the system, it is important to note how the Extractive Measurement (EMX) Cell is disassembled to be cleaned or have the windows replaced. It is important to leave enough room to allow this maintenance activity to easy happen.
  • Oxygen (O2) with Extractive Measurement (EMX) Cell

    Oxygen (O2) Measurements

    With the Extractive Measurement (EMX) Cell

    The Extractive Measurement (EMX) Cell has the option to be either purged or non-purged within the Transceiver Cover and Retro-Cover. For Non-Purged installations for an atmospheric gas like Oxygen (O2), this means that there will be ambient concentrations of Oxygen (O2) within the Active Measurement Path of the Extractive Measurement (EMX) Cell (i.e. in the Transceiver-Cover and Retro-Cover).

    For more information, please: Click Here

  • Application Engineering Review

    Application Review

    Selecting the best tool for the job

    The more information we have the about your application the easier it is to provide you with the exact equipment configuration required. Either a Boreal Laser Representative or one of our many Distributors will work with you to ensure that this technology and product configuration is ideal for you application.

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