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Hawk Measurement Systems Smart Sensor Technology for Gas Pipeline Monitoring

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Fibre Optic Distributed Sensor (FOS) The optical fibre cable is the sensor: The multiple core Fibre To The Home (FTTH) cable can be used as a distributed acoustic and strain sensor. The standard loose tube telecommunication fibre cable could be used as a temperature sensor.

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The optical fibre cable is the sensor: FOS Ideal design integrates loose tube fibre (for temperature sensing), tight buffered fibre (for strain and acoustic sensing) and adhesive tape together in one cable, so it could stick to flat surface. Sheath Loose tube Optical fibre Adhesive tape

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Distributed Acoustic Sensor (DAS) Position (m) Intensity (a.u.) Leak sound signal location Time (ms) Intensity (a.u.) Leak sound waveform Detect leak position Detect leak hole size

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DAS Third party interference detection: Position (m) Intensity (a.u.) Sound signal location Time (ms) Intensity (a.u.) Sound waveform

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Performance Specifications for DAS Maximum fibre length50 km Spatial Resolution0.5 m Location accuracyWithin 5 m or better Identify activities Gas leak, Gas pressure and leak hole size, digging, normal vehicle, human and animal passing etc. Acoustic wave bandwidth0 20 kHz distance pending Real time detectionYes Two channel detection to minimize signal fadingYes Tolerance to single cable fault*Yes Fault Detection / ReportingProgrammable fault alarms and reports Sensor Life Time>30 years Operating temperature range Control unit: +5 O C to +60 O C Optical fibre cable: -30 O C to +70 O C Control unit size4U 19 rack enclosure Operating Voltage 90 250 Vac 9-30 Vdc Power consumption

Performance Specifications for DTS Maximum fibre length50 km Spatial Resolution0.5 m Location accuracyWithin 5 m or better Temperature Resolution 0.1 C Temperature Accuracy 0.1 C Signal Averaging1 to 16,000,000 Data collection time 1 to 30 seconds, dependent on distance, accuracy and interrogation method. Fault Detection / ReportingProgrammable fault alarms and reports Sensor Life Time>30 years Operating temperature range Control unit: +5 O C to +60 O C Optical fibre cable: -30 O C to +70 O C Control unit size4U 19 rack enclosure Operating Voltage 90 250 Vac 9-30 Vdc Power consumption

Performance Specifications for DSS Maximum fibre length50 km Spatial Resolution0.5 m Location accuracyWithin 5 m or better Strain Resolution2 Strain Accuracy 2 Signal Averaging1 to 16,000,000 Data collection time1 to 30 seconds, dependent on distance, accuracy and interrogation method. Fault Detection / ReportingProgrammable fault alarms and reports Sensor Life Time>30 years Operating temperature range Control unit: +5 O C to +60 O C Optical fibre cable: -30 O C to +70 O C Control unit size4U 19 rack enclosure Operating Voltage 90 250 Vac 9-30 Vdc Power consumption