What is Line B? Line B is a probe-style TDLAS module designed for direct insertion into pipelines. It is specifically engineered to operate in negative-pressure environments (20-80 kPa abs) common in coal mine gas drainage headers, eliminating the need for sampling pumps and filters.

Designed for the Pipeline

In gas drainage applications, traditional sensors fail due to condensation, dust, and the complexity of sampling from negative-pressure lines. Line B solves this by moving the measurement into the pipe. The 40 mm flow-through window allows the gas to be measured in situ, exactly where it flows.

Line B pipeline probe schematic showing insertion window and G1 thread
Figure 2: Line B pipeline insertion probe design for direct-path measurement.

Technical Specifications

ParameterSpecification
Operating Pressure20 kPa to 200 kPa (Absolute)
Measurement Range0-100% vol CH4
Accuracy+/-3.5% Full Scale (at rated pressure)
Pressure CompensationIntegrated absolute pressure sensor
Certification TargetEx ia I Ma (Intrinsic Safety)
Process ConnectionG1" Thread (Customisable)
DimensionsDia 25 x 74 mm (Insertion length)
Line B operating pressure envelope: 20kPa to 200kPa absolute
Figure 3: Line B calibrated pressure envelope covering negative-pressure suction headers.

Why Direct Insertion Matters

  • No Sampling Pump: Eliminates the most common failure point in gas drainage monitoring.
  • Instant Response: Measurement happens in the pipeline, not at the end of a 10-meter sampling line.
  • Maintenance Free: No filters to clean, no water traps to empty.
  • Robust Optics: 2f/1f signal processing compensates for window contamination up to 50% transmission loss.