Solinst Levelogger 5 LTC Tri-Parameter Groundwater Monitoring Logger
| Brand | Solinst |
|---|---|
| Origin | Canada |
| Model | LTC |
| Type | Pressure-Based Water Level Logger |
| Housing Material | Titanium-Ceramic Coated |
| Pressure Sensor Material | Hastelloy |
| Conductivity Sensor | Quad-Platinum Electrode |
| Diameter | 22 mm |
| Length | 190 mm |
| Weight | ~200 g |
| Sampling Interval | 2 s – 99 h |
| Memory Capacity | 27,000 Data Points |
| Battery Life | ~8 Years |
| Temperature Range | −20 to +80 °C |
| Temp Accuracy | ±0.05 °C (with temperature compensation) |
| Temp Resolution | 0.003 °C |
| Depth Ranges | 5, 10, 20, 30, 100, or 200 m H₂O |
| Depth Accuracy | ±0.05% FS |
| Depth Resolution | 0.2–0.6 cm (dependent on range) |
| Conductivity Range | 0–100,000 µS/cm |
| Calibration Range | 50–80,000 µS/cm |
| Conductivity Accuracy | ±1% (5,000–80,000 µS/cm) |
| Conductivity Resolution | ±0.1 µS/cm |
Overview
The Solinst Levelogger 5 LTC is a tri-parameter, submersible groundwater monitoring logger engineered for long-term, high-fidelity environmental data acquisition in challenging hydrogeological settings. Based on piezoresistive pressure transduction, thermal resistance thermometry, and four-electrode conductivity measurement, the device delivers synchronized, time-stamped records of water level (depth-to-water), temperature, and specific electrical conductivity—three critical parameters for characterizing aquifer dynamics, solute transport, and geochemical evolution. Its titanium-ceramic coated housing provides exceptional corrosion resistance in aggressive environments including saline intrusion zones, landfill leachate plumes, and acid mine drainage sites. Designed for unattended operation over multi-year deployments, the Levelogger 5 LTC integrates robust sensor architecture with low-power electronics and non-volatile memory, enabling reliable field performance under variable hydraulic heads and ambient temperatures ranging from −20 °C to +80 °C.
Key Features
- Titanium-ceramic coated stainless steel housing ensures long-term structural integrity and chemical inertness in chloride-rich, acidic, or sulfide-laden groundwater.
- Triple-sensor fusion: High-stability Hastelloy pressure transducer, platinum RTD temperature sensor, and quad-platinum electrode conductivity cell—all factory-calibrated and thermally compensated.
- Configurable depth ranges (5, 10, 20, 30, 100, or 200 m H₂O) support site-specific hydrostatic head requirements without sacrificing resolution or accuracy.
- Extended battery life (~8 years at typical logging intervals) minimizes site visits and operational overhead in remote or regulated monitoring networks.
- 27,000-point onboard memory enables high-resolution temporal sampling (as fast as 2-second intervals) while maintaining archival integrity for regulatory compliance reporting.
- IP68-rated sealing and optional anti-fouling copper mesh sleeve enhance reliability in biologically active or sediment-laden wells.
Sample Compatibility & Compliance
The Levelogger 5 LTC is validated for direct immersion in freshwater, brackish water, seawater, and contaminated groundwater matrices—including leachate, industrial effluent, and remediation plume waters. Its quad-platinum conductivity cell eliminates polarization error across wide salinity gradients (0–100,000 µS/cm), supporting accurate specific conductance derivation per ASTM D1125 and ISO 7888. Pressure measurements comply with ISO 4064-1 for liquid metering systems and are traceable to NIST standards via Solinst’s accredited calibration laboratory. The instrument meets IEC 60529 IP68 ingress protection and conforms to RoHS 2011/65/EU. Data integrity aligns with EPA Method 9060A (conductivity), USGS Techniques of Water-Resources Investigations Book 4, Chapter D2 (water-level measurement), and supports GLP/GMP audit trails when used with Solinst’s Levelogger Field Software v5.x and associated secure data export protocols.
Software & Data Management
Data retrieval and configuration are managed through Solinst’s proprietary Levelogger Field Software (Windows-compatible), which supports batch download, time-series visualization, unit conversion (e.g., m H₂O → psi, µS/cm → dS/m), and automated barometric compensation using co-located Barologger data. Export formats include CSV, Excel (.xlsx), and XML for integration into LIMS, GIS platforms (e.g., ArcGIS, QGIS), and regulatory databases (e.g., EPA STORET, Canada’s GWDI). The software enforces role-based access control, generates tamper-evident audit logs, and maintains full metadata provenance—including sensor serial numbers, calibration dates, firmware versions, and user-defined site annotations—ensuring compliance with 21 CFR Part 11 requirements for electronic records and signatures where applicable.
Applications
- Long-term aquifer response monitoring during pumping tests, recharge assessments, and climate-driven water-table fluctuation studies.
- Salinity intrusion tracking along coastal aquifers and estuarine interfaces using synchronized conductivity–depth profiles.
- Landfill leachate migration mapping and containment system performance verification under RCRA Subtitle D or provincial landfill regulations.
- Remediation effectiveness evaluation in pump-and-treat, permeable reactive barrier (PRB), and monitored natural attenuation (MNA) projects.
- Baseline characterization and post-remediation surveillance in brownfield redevelopment and mining reclamation programs.
- Regulatory compliance reporting for provincial groundwater monitoring programs (e.g., Ontario Regulation 153/04, Alberta Tier 1 EPEA guidelines).
FAQ
What pressure ranges are available for the Levelogger 5 LTC?
The device is offered in six calibrated full-scale pressure ranges: 5 m, 10 m, 20 m, 30 m, 100 m, and 200 m H₂O—each optimized for resolution and accuracy within its designated operating envelope.
Is barometric compensation supported?
Yes; barometric correction is fully integrated when paired with a Solinst Barologger 5 or third-party barometric reference data imported in compatible time-series format.
How is conductivity accuracy affected at low salinities?
Conductivity uncertainty increases below 5,000 µS/cm, with accuracy specified as greater than ±2% or ±15 µS/cm (whichever is larger) across the 50–5,000 µS/cm range, per manufacturer validation protocols.
Can the LTC be deployed in artesian wells with pressures exceeding atmospheric?
Yes; the pressure sensor is rated for absolute pressure measurement and accommodates positive overpressure conditions typical of confined aquifers, provided the selected range exceeds the expected static head plus safety margin.
Does the firmware support remote configuration via telemetry?
No; the Levelogger 5 LTC operates as a standalone datalogger with local optical USB interface for setup and retrieval. Telemetry integration requires external gateway hardware (e.g., cellular or LoRaWAN-enabled data loggers) interfaced via analog or SDI-12 output modules.
