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Process Analyser Sample Bundles/Analyzer Bundle Types

Process Analyser Sample Bundles

  • Tube Selection for Analyzer Sample Systems +


    Selecting the right process tube for use in analyzer sample transport systems requires consideration of process and application conditions. There are a wide variety of metallic and non-metallic tubes available: welded and seamless 316 series stainless steel and more exotic alloys are also used.

    Common non-metallic tube materials are PFA, PFE, and PTFE fluoropolymers polyethylene and Halar (ECTFE). Some bundles may also contain coaxial tubing (tube-in-tube) or unheated tubes for calibration gas and blowback lines.

    O’Brien TrueTube® provides a wide variety of in-house services that dramatically improve the performance of industrial tubing including electropolishing and chemical passivation as well as thermocouple cleaning and cleaning for oxygen service. We combine these with Silcotek's SilcoNert® 2000 fused silica coating for the ultimate in sample transport consistency and speed.

    Improper tube selection may lead to a failed analyzer systems caused by adsorption, contaminants in the tube, corrosion stress cracking or gas permeation. Restricted sample flow, long sample lag times, and kinking are also problems often related to tube selection.

    TrueTube® Enhanced Bare Tubing

  • Analyzer Bundle Types +


    Specific applications by type of analyzer

    Gas Chromatography
    Keeping the sample at the same temperature and condition as it exists in the process stream ensures analyzer accuracy.
     

    Liquid or water contamination of the sample will cause a major dysfunction, so the sample needs to be maintained above its dew point at all times - a perfect application for TRACEPAK.

    Gas Chromatography typically use a single small diameter tube, 6mm or 1/4" seamless stainless steel or Teflon, with an electric tracer capable of maintaining 60°C/140°F at various ambient conditions, such as O'Brien's TRACEPAK.

    It is also common to have a multiple tube bundle for gas chromatography. An additional tube is often used to return the unused sample back to the process. Return lines for gas chromatography usually only require freeze protection.

    Application Sheets:

    Total Hydrocarbon Analyzers
    More challenging than most sample transport systems, THA have high exposure temperatures and high maintenance temperatures (above 120°C/250°F).
     

    To avoid failed sample lines, a thorough design with proper tubing such as PFA Teflon and a temperature controller is needed.

    Continuous Emissions Monitoring
    Tubing bundles for the CEM market incorporate a wide variety of configurations typically for dry or wet extractive systems.
     

    In dry extractive systems, after the sample is extracted from the flue and conditioned to remove particulates and moisture, the gaseous sample is transported in a heat traced line to an environmental enclosure where the analyzer is located. The heat traced line is commonly a tubing bundle (we recommend TRACEPAK) containing separate lines for the sample and calibration gas. An unheated blowback line is often included as well.

    In wet extractive systems, commonly used by process industries, the sample needs to be maintained above the vaporization temperature when transported to the analyzer. This prevents acids from condensing out of the sample. TRACEPAK used for these applications generally require high temperature heaters and a temperature controller.

    Application Sheets: