Solinst Levelogger 5 Pressure-Based Water Level Logger

Overview

The Solinst Levelogger 5 is a high-precision, self-contained pressure-based water level and temperature datalogger engineered for long-term, unattended monitoring in groundwater, surface water, and industrial fluid systems. It operates on the fundamental principle of hydrostatic pressure measurement: water column height is derived from the differential pressure between the sensor’s submerged diaphragm and atmospheric reference—either via internal barometric compensation (using an integrated Barologger Edge) or synchronized external atmospheric pressure logging. The Levelogger 5 employs a solid-state, piezoresistive silicon pressure transducer fabricated from corrosion-resistant Hastelloy®, enabling stable performance under extreme overpressure conditions (up to 2× full-scale rating) and across aggressive chemical environments. Its fully sealed, 22 mm diameter cylindrical housing features a titanium physical vapor deposition (PVD) coating—providing exceptional resistance to chloride-induced pitting, hydrogen embrittlement, and biofouling—while maintaining mechanical integrity in boreholes, coastal wells, and wastewater infrastructure.

Key Features

• Hastelloy® pressure sensor with 0.05% full-scale accuracy and extended overpressure tolerance (2× FS)
• Titanium PVD-coated 316 stainless steel housing (Ø22 mm × 159 mm), rated for continuous submersion in saline, acidic, or sulfidic aquifers
• Integrated platinum resistance thermometer (Pt1000) with ±0.05 °C accuracy and 0.003 °C resolution
• Automated, real-time temperature compensation across -10 °C to +50 °C, optimized for rapid thermal equilibration in variable-depth installations
• 10-year lithium battery life at standard 1-minute sampling intervals; supports programmable sampling from 0.125 s to 99 h per reading
• 150,000 reading non-volatile EEPROM memory with timestamped, dual-parameter (level + temperature) storage
• Optical infrared interface for high-speed data download and configuration—eliminating contact corrosion and enabling underwater retrieval without disassembly
• Faraday-shielded electronics architecture compliant with IEC 61000-4-5 surge immunity standards (lightning & ESD protection)
• Multi-protocol communication: optical IR, RS-232, USB, and SDI-12—enabling integration into existing telemetry networks and SCADA systems

Sample Compatibility & Compliance

The Levelogger 5 is validated for deployment in diverse hydrogeological and regulatory contexts. Its materials—Hastelloy®, titanium PVD, FKM elastomers, and POM structural components—are chemically inert per ASTM D543 and ISO 15161, ensuring compatibility with potable water, brackish aquifers, landfill leachate, and geothermal fluids. The instrument meets ISO/IEC 17025 traceability requirements when calibrated against NIST-traceable pressure standards. For environmental monitoring programs governed by EPA Method 9025, ASTM D4044, or ISO 10523, the Levelogger 5 satisfies data integrity requirements through deterministic clock stability (±1 minute/year), audit-ready metadata tagging, and GLP-compliant firmware logs. Optional Barologger Edge units provide synchronized barometric correction meeting USGS TWRI 4-A2 recommendations for transducer-based water level correction.

Software & Data Management

Solinst Levelogger Software v6.x provides a validated, Windows-based platform for device configuration, data retrieval, and post-processing. It supports batch compensation workflows—including simultaneous multi-point barometric correction using Barologger Edge data—and implements automated pressure-to-level conversion per ISO 9001–aligned algorithms (accounting for local gravity, water density, and thermal expansion). The software exports time-series data in CSV, Excel, and USGS NWIS-compatible formats, with embedded metadata fields for well ID, sensor depth, calibration date, and QA/QC flags. All user actions—including parameter changes, data exports, and firmware updates—are logged with timestamps and operator IDs, satisfying FDA 21 CFR Part 11 electronic record and signature requirements where applicable. Firmware updates are digitally signed and verified to ensure integrity and prevent unauthorized modification.

Applications

• Long-term aquifer response monitoring during pumping tests, slug tests, and recovery analysis
• Coastal groundwater-surface water interaction studies (e.g., tidal influence, seawater intrusion)
• Landfill leachate mound tracking and containment system performance verification
• Drainage network and stormwater basin level profiling under dynamic flow regimes
• Managed aquifer recharge (MAR) and artificial recharge basin hydraulics assessment
• Regulatory compliance monitoring per EPA UIC Class V, EU WFD reporting, and provincial groundwater directives
• Industrial tank level and process water reservoir surveillance with minimal maintenance overhead

FAQ

What pressure ranges are available for the Levelogger 5?
The Levelogger 5 is offered in eight standard full-scale ranges: 1.5 m, 2 m, 5 m, 10 m, 20 m, 30 m, 100 m, and 200 m H₂O—each with corresponding absolute pressure ratings and calibrated accuracy specifications.
Is atmospheric pressure compensation mandatory for accurate water level calculation?
Yes—hydrostatic pressure measurements require barometric compensation to isolate the true water column height. This is achieved either via a co-located Barologger Edge unit or synchronized external barometric data.
Can the Levelogger 5 be deployed in freezing conditions?
It operates continuously from -20 °C to +80 °C; however, ice formation inside the vent tube must be prevented in sub-zero environments using desiccant-filled vent caps or heated vent lines.
How is data security and traceability ensured during field retrieval?
All optical downloads generate immutable, time-stamped transaction logs. Data files include embedded CRC-32 checksums, sensor serial numbers, and firmware revision identifiers to support chain-of-custody documentation.
Does the Levelogger 5 support remote telemetry integration?
Yes—via SDI-12 output, it interfaces directly with Campbell Scientific, Onset HOBO, or other industry-standard data loggers and cellular/GSM telemetry gateways for near-real-time transmission.