Solinst Levelogger 5 Junior Pressure-Based Water Level Logger

Overview

The Solinst Levelogger 5 Junior is a compact, submersible, pressure-based water level logger engineered for long-term, unattended monitoring of groundwater and surface water levels in wells, piezometers, rivers, lakes, reservoirs, and storage tanks. It operates on the fundamental principle of hydrostatic pressure measurement: water column height above the sensor is derived from absolute pressure sensed by a high-stability silicon piezoresistive transducer, with real-time temperature compensation applied via an integrated thermistor. Designed for cost-sensitive yet technically rigorous applications—including regulatory compliance monitoring, watershed studies, and resource management—the Levelogger 5 Junior delivers laboratory-grade repeatability and field-proven reliability within a ruggedized 316 stainless steel housing rated IP68 for continuous submersion at its full-scale depth.

Key Features

• High-capacity non-volatile memory: Stores up to 40,000 synchronized pairs of water level (in meters or feet) and temperature (°C) measurements—sufficient for multi-year deployments without data offload.
• Configurable sampling flexibility: User-defined logging intervals range from 0.5 seconds (for rapid-response events such as slug tests or flood pulses) to 99 hours (for seasonal trend analysis), supporting both linear and event-triggered acquisition modes.
• Five-year battery endurance: Optimized low-power electronics and efficient firmware enable up to five years of continuous operation at standard 15-minute logging intervals—minimizing site visits and operational overhead.
• Traceable metrological integrity: Factory-calibrated against NIST-traceable standards; each unit ships with a lifetime calibration certificate documenting initial accuracy (±0.1% FS), thermal drift coefficients, and pressure hysteresis performance.
• SDI-12 interoperability: Fully compliant with the industry-standard SDI-12 protocol, enabling seamless integration with third-party dataloggers, telemetry systems, and automated environmental monitoring networks.
• Modular ecosystem compatibility: Shares software architecture, accessories (e.g., LevelVent vented cables, Levelogger Connect interface), and firmware update pathways with the Solinst Levelogger EDGE platform—ensuring scalability across mixed-deployment sites.

Sample Compatibility & Compliance

The Levelogger 5 Junior is validated for deployment in freshwater, brackish, and mildly corrosive environments typical of shallow-to-moderate depth monitoring wells (≤10 m). Its 316 stainless steel body resists pitting and crevice corrosion in chloride-rich aquifers, while the hermetically sealed sensor cavity prevents electrolytic ingress. The device complies with ASTM D4043–22 (Standard Guide for Selection of Instruments for Measuring Ground-Water Levels) and supports GLP-aligned data integrity through time-stamped, tamper-evident file generation. All firmware and Levelogger EDGE software versions adhere to ISO/IEC 17025:2017 requirements for data recording systems used in accredited environmental testing laboratories.

Software & Data Management

Data retrieval and configuration are performed using Solinst’s Levelogger EDGE desktop application (Windows/macOS), which provides intuitive visualization, batch processing, barometric compensation workflows, and export to CSV, Excel, or GIS-ready formats (e.g., Shapefile, GeoJSON). The software enforces audit-trail functionality per FDA 21 CFR Part 11 requirements—including electronic signatures, user access controls, and immutable log files—making it suitable for regulated reporting under EPA, Environment Canada, or EU WFD frameworks. Firmware updates preserve backward compatibility, and raw binary files retain embedded metadata (sensor serial number, calibration date, firmware version) to ensure full traceability throughout the data lifecycle.

Applications

• Pumping and recovery test analysis (including drawdown/recovery curve fitting per Theis or Cooper-Jacob models)
• Surface water stage monitoring for flood forecasting, dam safety, and reservoir operation
• Watershed-scale hydrologic budgeting and baseflow separation studies
• Wetland hydroperiod assessment and ecological flow regime characterization
• Tank level verification in municipal water distribution and industrial process control
• Long-term aquifer response tracking during drought or recharge events

FAQ

Is the Levelogger 5 Junior suitable for saline or seawater applications?
The unit is rated for freshwater and low-conductivity brackish environments; extended exposure to full-strength seawater (>35 ppt) is not recommended due to accelerated electrochemical corrosion risk.
Can barometric pressure compensation be applied post-deployment?
Yes—Levelogger EDGE supports import of external barometric data (e.g., from a Solinst Barologger or NOAA station) and automatic correction of water level records using standard atmospheric pressure algorithms.
Does the device require annual recalibration?
No—Solinst provides a lifetime calibration certificate; however, users may opt for periodic verification (e.g., every 2–3 years) against a reference standard in accordance with internal QA protocols or regulatory guidance.
What is the maximum allowable submersion depth for the 10 m model?
The 10 m H₂O full-scale range corresponds to a maximum static head of 10 meters at 20°C; actual depth tolerance depends on local fluid density and temperature but remains within ±0.5% of reading across the specified operating range (-20°C to +40°C).
Is wireless telemetry supported natively?
The Levelogger 5 Junior does not include built-in radio or cellular modules; however, it interfaces directly with Solinst’s Levelogger EDGE Data Transfer Unit (DTU) for Bluetooth-enabled field downloads, or with third-party SDI-12-compatible RTUs for remote telemetry integration.