YS-ZS100 Azure Cloud & Wind Confluence In-Situ Lysimeter with Precision Weighing System

Overview

The YS-ZS100 In-Situ Lysimeter with Precision Weighing System is an engineered field-deployable solution for continuous, high-fidelity quantification of evapotranspiration (ET), soil water balance, and infiltration dynamics under natural environmental conditions. Designed for permanent or semi-permanent installation, the system integrates a stainless-steel lysimeter monolith—fully embedded at ground level—with a high-resolution load cell array (±0.05% full-scale repeatability) and temperature-compensated signal conditioning. Measurement principle relies on gravimetric mass change detection: real-time weight variations of the intact soil column (including vegetation, if present) are recorded at user-configurable intervals (1 min to 24 h), enabling calculation of net water flux via ΔW/Δt, where W represents total mass and t denotes time. The ground-level (flush-mounted) configuration minimizes microclimatic disturbance and edge effects, preserving natural boundary conditions critical for hydrological modeling validation, irrigation scheduling research, and climate impact studies.

Key Features

• Flush-mounted, in-situ installation compatible with undisturbed soil profiles up to 1.2 m depth and 1.0 m diameter;
• Corrosion-resistant 316 stainless-steel lysimeter body with integrated root barrier and drainage control layer;
• High-stability load cell system calibrated to NIST-traceable standards, supporting long-term drift compensation algorithms;
• Integrated temperature and humidity sensor suite (PT100 RTD + capacitive RH) co-located with weighing chamber to correct for thermal expansion and atmospheric buoyancy effects;
• IP68-rated enclosure housing data logger, power management, and wireless telemetry module (LTE-M/NB-IoT optional);
• Modular design allowing field replacement of load cells, sensors, and battery packs without excavation.

Sample Compatibility & Compliance

The YS-ZS100 accommodates heterogeneous soil columns—including clay loam, sandy silt, and organic-rich topsoil—with or without established vegetation (e.g., turfgrass, wheat, alfalfa). Its structural integrity supports surface loading up to 20 kPa, ensuring stability under rainfall, snow accumulation, and light vehicular access. The system conforms to ASTM D5859-22 (Standard Guide for Installation and Operation of Field Lysimeters) and aligns with ISO 10381-5:2022 (Soil quality — Sampling — Part 5: Guidance on monitoring of soil water movement). All electronic components comply with IEC 61326-1 (EMC requirements for laboratory and industrial use) and CE marking directives. Data acquisition protocols support audit-ready metadata tagging per GLP principles, including timestamp, sensor ID, calibration status, and environmental context flags.

Software & Data Management

The instrument interfaces with the AzureLysim v3.2 desktop and cloud platform (Windows/macOS/Linux compatible), providing real-time visualization, automated ET partitioning (via Penman-Monteith coupling), and batch export in CF-NetCDF and CSV formats. Raw mass data undergoes multi-stage filtering: outlier rejection (modified Thompson τ), thermal drift correction using dual-point ambient reference, and hydrostatic pressure compensation based on measured pore-water tension (if optional tensiometer kit installed). Audit trails record all parameter modifications, user logins, and firmware updates. For regulated environments, optional 21 CFR Part 11 compliance mode enables electronic signatures, role-based access control, and immutable data archiving with SHA-256 hash verification.

Applications

• Long-term watershed-scale evapotranspiration monitoring for hydrological model calibration (e.g., SWAT, HYDRUS-1D);
• Evaluation of drought-resilient crop varieties under controlled deficit irrigation regimes;
• Validation of satellite-based ET products (e.g., MOD16A2, SSEBop) across heterogeneous land cover;
• Soil hydraulic property estimation via inverse modeling of drainage and redistribution phases;
• Urban green infrastructure performance assessment (bioswales, green roofs, permeable pavements);
• Carbon–water coupling studies in eddy covariance flux tower footprints.

FAQ

What is the maximum recommended soil column height for accurate measurement?
The system is validated for monolith heights between 0.6 m and 1.2 m; optimal resolution is achieved within the 0.8–1.0 m range when paired with standard 1.0 m diameter configuration.
Can the YS-ZS100 operate autonomously during extended power outages?
Yes—integrated lithium-thionyl chloride battery pack provides ≥18 months of operation at 15-minute logging intervals; solar charging option extends deployment indefinitely.
Is root penetration into the lysimeter base prevented?
A continuous 0.5 mm stainless-steel mesh barrier (welded to base plate) inhibits root ingress while maintaining hydraulic continuity and minimizing capillary break effects.
How is calibration traceability maintained over multi-year deployments?
Field calibration kits include certified deadweight sets (Class M1, ±50 mg uncertainty) and thermal reference blocks; software logs all calibration events with digital signature and photo documentation upload capability.
Does the system support integration with third-party meteorological stations?
Yes—RS-485 Modbus RTU and SDI-12 interfaces enable synchronized ingestion of external PAR, wind speed, air temperature, and precipitation data for energy-balance closure analysis.