Starwood TERRALOG Multi-Function Acoustic Leak Detector

Overview

The Starwood TERRALOG Multi-Function Acoustic Leak Detector is a field-deployable, battery-powered acoustic ground microphone system engineered for non-invasive detection and precise localization of leaks in pressurized underground water, gas, or district heating pipelines. It operates on the principle of passive acoustic emission analysis: when fluid escapes under pressure through a pipe defect, it generates broadband mechanical vibrations (typically 100–2000 Hz) that propagate through soil and pavement layers. The TERRALOG captures these transient ground-coupled signals using a high-fidelity piezoelectric geophone sensor (vonRoll PE type), converts them into digitized time-domain waveforms, and presents real-time spectral and amplitude data to the operator via its optimized LCD interface. Unlike active methods such as correlation or gas tracing, this instrument relies solely on ambient acoustic energy—making it ideal for rapid pre-survey screening, urban infrastructure audits, and routine network integrity verification where minimal excavation and zero system interruption are required.

Key Features

• High-sensitivity PE geophone sensor with integrated high-strength magnetic base for stable, vibration-damped coupling to asphalt, concrete, or soil surfaces
• Outdoor-optimized 128 × 64 pixel backlit LCD display with adjustable contrast—designed for legibility under direct sunlight and low-light conditions
• Dual audio transmission modes: interference-immune Bluetooth 2.1 Class II wireless link (EN 300 328 compliant) and shielded analog cable connection for electromagnetic-noise-prone environments (e.g., near substations or rail lines)
• Real-time spectral visualization: dynamic bar-graph representation of ground noise distribution across user-defined frequency bands
• Onboard audio recording capability with timestamped WAV file storage (microSD card slot); recordings exportable via USB 2.0 to PC for post-processing or archival
• Configurable digital filtering: independent high-pass and low-pass filters with adjustable cutoff frequencies—enabling suppression of traffic rumble, wind noise, or pump harmonics without altering displayed RMS amplitude values
• Integrated hearing protection logic: automatic gain limiting and peak-clipping algorithm compliant with EN 50332-1 acoustic safety thresholds
• Ergonomic, single-hand-operable housing constructed from impact-resistant ABS/PA Schulablend polymer; IP54-rated for dust and water splashes during field use
• Intelligent power management: auto-shutdown after 10 minutes of inactivity; dual-battery support (alkaline/NiMH) with 50-hour host runtime and 30-hour headset endurance

Sample Compatibility & Compliance

The TERRALOG is validated for use on buried metallic (cast iron, ductile iron, steel) and non-metallic (PVC, PE, GRP) pressurized pipelines operating at typical municipal water distribution pressures (0.2–1.2 MPa). Its geophone-based sensing architecture ensures consistent response across heterogeneous surface materials—including asphalt, concrete, cobblestone, and compacted gravel—without requiring surface preparation. All electronic subsystems conform to EU regulatory frameworks: CE marking per Directive 2014/30/EU (EMC), 2014/35/EU (LVD), and 2011/65/EU (RoHS). Electromagnetic compatibility is verified to EN 61326-1:2013 (industrial environment), while RF emissions and immunity meet ETSI EN 300 328 v2.2.1. Electrical safety complies with EN 61010-1:2010 for portable measurement equipment. Though not certified to ISO 9001 or ISO/IEC 17025, the device supports GLP-aligned documentation workflows via timestamped audio logs and exportable metadata.

Software & Data Management

The TERRALOG operates as a standalone field instrument with no proprietary desktop software dependency. All recorded audio files (WAV format, 16-bit, 8 kHz sampling) retain embedded UTC timestamps and sensor metadata (gain setting, filter status, battery level). Files are stored on removable microSD cards (up to 32 GB) and transferable via standard USB 2.0 interface to Windows/macOS/Linux systems. While no vendor-specific analysis suite is bundled, exported WAV files are fully compatible with third-party signal processing tools—including MATLAB Signal Processing Toolbox, Audacity (with spectral analysis plugins), and commercial leak detection platforms supporting IEEE 1139-compliant waveform ingestion. For enterprise fleet management, the device’s consistent file naming convention (e.g., TERRALOG_20240522_143247.wav) enables automated ingestion into CMMS or GIS-integrated asset monitoring systems.

Applications

• Routine leakage surveys for municipal water utilities performing DMA (District Metered Area) validation
• Precision leak pin-pointing prior to excavation—reducing trench length and associated restoration costs
• Post-repair verification to confirm seal integrity before system re-pressurization
• Leak detection in heritage districts where ground-penetrating radar or correlation methods are impractical due to limited access points or complex pipe networks
• Thermal network monitoring for district heating systems with insulated precast pipes
• Emergency response during pipe bursts, enabling rapid identification of secondary leak sources beneath roadways or sidewalks

FAQ

Does the TERRALOG require calibration before each use?
No—factory calibration is traceable to national metrology standards and remains stable over the specified operating temperature range (−15 °C to +65 °C). Annual verification against reference acoustic sources is recommended for metrological continuity.
Can the device distinguish between leak noise and background traffic vibration?
Yes—via configurable bandpass filtering and real-time spectral profiling. Operators typically isolate leak signatures in the 300–1200 Hz range, where fluid turbulence dominates over low-frequency vehicle rumble (<100 Hz) and high-frequency wind noise (>3 kHz).
Is Bluetooth pairing compatible with iOS and Android mobile devices?
The TERRALOG uses Bluetooth 2.1 Class II for headset communication only; it does not support smartphone pairing or app-based control. Audio streaming is exclusively to the included Bluetooth headset.
What is the maximum effective detection depth for a 10 mm water leak at 4 bar pressure?
Under optimal conditions (asphalt surface, dry sandy loam, no adjacent noise sources), detection range is typically 1.5–2.5 m. Depth sensitivity decreases with increasing soil moisture, clay content, or surface irregularity—consistent with ISO 20480-1:2019 guidance on acoustic leak detection limits.
Are replacement sensors and magnetic bases available as spare parts?
Yes—vonRoll PE geophone modules (PN: VR-PE-GM-200), magnetic couplers (PN: MAG-TRI-75), and calibrated tribracket assemblies are stocked and supplied with full mechanical and electrical specifications.