AZ ENVILog-100 Soil Moisture and Temperature Monitoring System
| Brand | AZ (Beijing Aozuo) |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | OEM Manufacturer |
| Product Category | Domestic |
| Model | ENVILog-100 |
| Instrument Type | Soil Moisture and Water Potential Analyzer |
| Measurement Principle | TDR-FDR Hybrid (Time-Domain Reflectometry with Frequency Conversion Output) |
| Volumetric Water Content Range | 0–60% VWC |
| Temperature Range | −40 °C to +80 °C |
| VWC Accuracy | ±1% VWC (typical soils), ±3% VWC (saline/mineral-rich soils, 0–50% VWC) |
| Temperature Accuracy | ±0.2 °C (typical), ±0.4 °C (full scale) |
| Dielectric Constant Output | Yes |
| Output Interfaces | 4× SDI-12, 1× RS232, 2× RS485, 8× DI (opto-isolated), 4× CI, 16× DO, USB, Ethernet, 4G LTE + Wi-Fi |
| Data Logging | 24-bit ADC, 1000 Hz sampling rate, 8-channel analog input |
| Power Management | Low-power embedded architecture, field-deployable for multi-year unattended operation |
| Compliance | ISO 9001:2015 certified (ENVIdata platform, since 2010 |
Overview
The AZ ENVILog-100 Soil Moisture and Temperature Monitoring System is an integrated, field-deployable environmental sensing platform engineered for long-term, high-reliability measurement of volumetric water content (VWC), soil temperature, and dielectric permittivity in heterogeneous terrestrial environments. Its core sensor employs a hybrid time-domain reflectometry (TDR) and frequency-domain conversion architecture: rather than relying solely on capacitive resonance (as in conventional FDR), the system precisely measures signal propagation delay along a coplanar transmission line embedded in a PCB-based probe, then converts transit time into a stable, high-resolution frequency output (>100 MHz). This design delivers enhanced sensitivity in clay-rich and saline soils—where traditional capacitance-based sensors suffer from ionic interference—while retaining the cost-efficiency and mechanical robustness of solid-state printed circuit construction. The ENVILog-100 is not a standalone sensor but a complete edge-to-cloud monitoring solution: it integrates a ruggedized, metal-shielded data logger with real-time processing capability, onboard clock synchronization, C-language programmability, and dual-mode connectivity (4G LTE + Wi-Fi), enabling autonomous operation across remote agricultural plots, ecological transects, hydrological basins, and climate observatories.
Key Features
- Hybrid TDR-FDR measurement principle optimized for accuracy in high-clay and moderate-salinity soils (validated up to 5 dS/m EC)
- Wide dynamic range: 0–60% VWC and −40 °C to +80 °C, with factory-calibrated accuracy of ±1% VWC in mineral soils and ±0.2 °C temperature resolution
- Dual-output capability: calibrated VWC and temperature values plus raw dielectric constant (εr) for advanced pedophysical modeling and site-specific calibration
- Industrial-grade data logger featuring 24-bit analog-to-digital conversion, 1000 Hz sampling, 8-channel analog input, and opto-isolated digital I/O (8 DI / 4 CI / 16 DO)
- Multi-protocol communication stack: SDI-12 (4 ports), RS232 (1), RS485 (2 with daisy-chain expansion support), Modbus RTU/TCP, and native ENVIdata cloud integration
- Low-power architecture enabling multi-year deployment on solar-rechargeable batteries; average current draw < 1.2 mA in sleep mode
- IP68-rated probe housing with freeze-thaw resistant encapsulation and UV-stabilized cable jacketing for permanent burial
Sample Compatibility & Compliance
The ENVILog-100 is validated for continuous in-situ monitoring across diverse soil textures—including sandy loam, silty clay, volcanic ash, and organic peat—with minimal drift over 36+ months of field exposure. It meets ASTM D5778 (Standard Test Method for Electronic Friction Cone and Piezocone Penetration Testing) for signal integrity in heterogeneous media and aligns with ISO 11274:2019 (Soil quality — Determination of water retention characteristic) for volumetric water content traceability. The ENVIdata server platform—hosted either on-premise or via AZ-managed infrastructure—is ISO 9001:2015 certified (certification #CN10/12345, renewed annually since 2010) and supports audit-ready data lineage, including timestamped metadata, firmware version logging, and hardware health telemetry. While not FDA 21 CFR Part 11–compliant by default, optional configuration packages provide electronic signature enforcement, user role-based access control, and immutable audit trails for GLP/GMP-aligned research deployments.
Software & Data Management
Data acquisition, visualization, and export are managed through the ENVIdata web platform—a secure, role-based SaaS application accessible via modern browsers. Users configure measurement intervals (1 min to 24 h), define alert thresholds (e.g., VWC < 12% triggers SMS/email), and generate time-series plots with overlay support for multi-sensor correlation analysis (e.g., soil moisture vs. air temperature vs. precipitation). Historical datasets are downloadable in CSV, NetCDF, or Excel formats, with metadata compliant with FAIR principles (Findable, Accessible, Interoperable, Reusable). The platform supports GIS-integrated mapping of distributed sensor networks, automatic firmware updates over-the-air, and RESTful API access for integration into third-party LIMS or SCADA systems. All data transmissions use TLS 1.2 encryption; local logger storage retains ≥12 months of high-frequency records on internal flash memory.
Applications
- Precision irrigation scheduling in row crops, orchards, and greenhouse production systems
- Long-term eddy covariance flux tower ancillary monitoring for evapotranspiration partitioning
- Soil moisture initialization and validation for regional hydrological models (e.g., SWAT, VIC)
- Permafrost degradation studies and seasonal frost table tracking in alpine and boreal ecosystems
- Landfill cover performance assessment and leachate migration monitoring
- Regulatory compliance reporting for soil moisture thresholds under national drought mitigation frameworks
FAQ
What calibration protocols are supported for site-specific soil types?
Factory calibration covers common mineral soils (FAO textural classes); users may perform two-point or multi-point field calibration using gravimetric sampling and regression against εr—ENVIdata includes built-in tools for polynomial and Topp equation fitting.
Can the ENVILog-100 operate without cellular coverage?
Yes—the logger stores all data locally and synchronizes automatically when connectivity resumes; offline operation is fully autonomous with no data loss.
Is external power required for continuous operation?
No—standard configuration includes a 12 V DC input compatible with solar charge controllers; battery life exceeds 3 years with 15-minute sampling intervals using a 20 Ah LiFePO4 pack.
How is data security ensured during transmission and storage?
All communications use TLS 1.2; stored data is encrypted at rest using AES-256; user accounts enforce password complexity and session timeout policies.
Does the system support integration with third-party weather stations or SCADA platforms?
Yes—via Modbus TCP/RTU, RS485 serial bridging, or HTTP POST to custom endpoints; documented API specifications and driver libraries are provided with each shipment.
