Methane

QUICK GAS FACTS:

Target gas specific information is included below for both Open Path Gas Detection and In-Situ Monitoring Applications.

  • Laser Based - Open Path Gas Detection

    Open Path Gas Detection

    Setting Alarm Thresholds:

    Boreal Laser is able to configure their GasFinder instruments to detect different ranges. The table below shows which 10 m Plume Alarm Thresholds are detectable with each range:

    It is important to note that the suitability of each range can differ depending on the applicaiton.

    Lo-Range Methane (CH4L):

    The table below shows how the example Alarm Thresholds fit within the Detectable Range for Open Path Gas Detection Applications.

    For the sake of illustration and simplicity, we’ll assume that the concentration of the plume is homogeneous throughout. As the size of the plume increases, we’ll be able to see lower Path Average Concentrations – this is the same for the MDL, Sensitivity, and Full Scale.

    Hi-Range Methane (CH4H):

    The table below shows how the example Alarm Thresholds fit within the Detectable Range for Open Path Gas Detection Applications.

    For the sake of illustration and simplicity, we’ll assume that the concentration of the plume is homogeneous throughout. As the size of the plume increases, we’ll be able to see lower Path Average Concentrations – this is the same for the MDL, Sensitivity, and Full Scale.

  • Laser Based - Mobile Gas Detection

    Mobile Monitoring:

    Laser Based – Fixed Point Gas Detection

    The Measurement Cell on the GasFinder3-VB (Vehicle Based) and GasFinder3-AB (Airborne) has a 3-Pass arrangement that creates at 3m (9ft) long Active Measurement Path.

    Lo-Range Methane (CH4L) with VB/AB Cell:

  • Laser Based - In-Situ Gas Analysis

    IN-SITU MONITORING

    Laser Based Gas Monitoring and Analysis

    Making measurements within a contained process is handled differently than those in Open Path/Line-of-Sight arrangements. It is often assumed that the concentration is more or less homogeneous for path lengths less than 5m (15ft).

    As Path Length (and the length of the Active Measurement Path) changes, so to does the Detectable Range of the GasFinder.

    The relationship between the Path Length and the Detectable Range for Path Average Concentrations is both inverse and proportional:

    • If the Path Length increases then the Path Average Concentration Detectable Range (MDL, Sensitivity, and Full Scale) will decrease.
    • If the Path Length decreases then Path Average Concentration Detectable Range (MDL, Sensitivity, and Full Scale) will increase.

    The table below shows an example how the Minimal Detectable Limit (MDL) can change as the Path Length is increased and decreased.

    Lo-Range Methane (CH4L):

    Hi-Range Methane (CH4H):

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