IMKO TRIME-PICO-IPH50 Deep-Profile Soil Moisture and Electrical Conductivity Measurement System
| Brand | IMKO |
|---|---|
| Origin | Germany |
| Manufacturer | IMKO GmbH |
| Model | TRIME-PICO-IPH50 |
| Instrument Type | TDR-Based Soil Moisture & EC Profiler |
| Depth Range | Up to 50 m |
| Sensor Principle | Time-Domain Reflectometry (TDR) at 1 GHz |
| Probe Diameter | 50 mm |
| Measurement Volume | 3 L (200 mm × Ø150 mm) |
| Moisture Range | 0–100% vol. |
| EC Range | 0–6 dS/m (standard), extended up to >50 dS/m with material-specific calibration |
| Moisture Accuracy | ±2% (0–40%), ±3% (40–70%) |
| Repeatability | ±0.3% |
| Temperature Drift | ±0.3% / °C |
| Operating Temp. | −15 °C to +50 °C (customizable) |
| Cable Length | Customizable, up to 50 m |
| Calibration | Factory-calibrated for mineral soils |
| Power Supply | 7–24 VDC (probe) |
| Bluetooth module | 1000 mAh Ni-MH battery (≥1500 measurements per charge) |
| HD2 reader | 4.8 VDC, 2000 mAh (≥5000 measurements) |
| Enclosure Rating | IP67 (HD2 reader) |
| Communication | Bluetooth 2.0 (10 m range), compatible with Android/iOS smartphones and Windows CE PDAs |
Overview
The IMKO TRIME-PICO-IPH50 is a high-precision, deep-profile soil moisture and electrical conductivity (EC) measurement system engineered for long-term, in-situ monitoring of vadose zone hydrodynamics down to 50 meters depth. It employs patented Time-Domain Reflectometry (TDR) technology operating at a stable 1 GHz carrier frequency, enabling direct, non-destructive quantification of the dielectric permittivity of soil or other porous media. Since volumetric water content exhibits a strong, empirically validated relationship with bulk dielectric constant—particularly in mineral soils—the system converts nanosecond-scale signal propagation delays into highly reproducible moisture readings. IMKO’s proprietary time-sampling architecture achieves sub-3 picosecond timing resolution, significantly improving sensitivity to subtle changes in water distribution across heterogeneous geological strata. Unlike capacitance-based systems, TDR is inherently insensitive to soil salinity-induced drift when operated at high frequencies—though the TRIME-PICO-IPH50 integrates dual-parameter acquisition (moisture + EC) to support salinity correction and pore-water characterization in saline or anthropogenically impacted profiles.
Key Features
- 50-meter maximum profiling depth enabled by robust stainless-steel TRIME-T3-IPH50 probe with hermetically sealed electronics and low-loss coaxial waveguide design
- Simultaneous measurement of volumetric water content (0–100% vol.) and bulk electrical conductivity (0–6 dS/m standard range; extended ranges available with site-specific calibration)
- Factory calibration traceable to DIN ISO 11277 for mineral soils; field recalibration supported via PICO-TALK software with up to 15 independent, user-defined calibration curves
- Modular architecture: interchangeable probe, customizable access tube (OD 60–62 mm, ID 50–52 mm; compatible with PVC, PE, and PTFE liners), and flexible data acquisition options
- Low-power operation: 100 mA peak draw during 2–3 s measurement cycle at 12 VDC; optimized for solar-recharged remote stations or battery-powered deployments
- IP67-rated HD2 handheld reader for on-site verification and real-time display of moisture, temperature, and EC—no internal storage, ensuring deterministic readout integrity
Sample Compatibility & Compliance
The TRIME-PICO-IPH50 is validated for use in mineral soils, loams, clays, sands, and engineered backfill materials. Its TDR waveform analysis accommodates variable textural heterogeneity and moderate organic content (<15% w/w), though high-organic or peat-rich matrices require empirical recalibration. The system complies with ASTM D5778 (Standard Test Method for Performing Electronic Friction Cone and Piezocone Penetration Testing) for probe insertion methodology and adheres to ISO 14001 environmental management principles in manufacturing. Data acquisition workflows support GLP-compliant metadata tagging (time stamp, GPS coordinates, operator ID) when used with PICO-TALK on Windows CE devices. While not FDA 21 CFR Part 11 certified out-of-the-box, audit-trail functionality—including full parameter logging, firmware versioning, and user-access logs—can be configured to meet GMP-aligned validation requirements for regulated environmental monitoring programs.
Software & Data Management
PICO-TALK is the native configuration and acquisition software, available in English and Chinese language interfaces. Installed on ruggedized PDAs or Windows-based tablets, it enables real-time waveform visualization, sensor diagnostics, multi-point profile mapping, and automated calibration curve generation using reference gravimetric or neutron probe datasets. Raw TDR waveforms are stored in IEEE-compliant binary format (.tdr), ensuring long-term archival integrity and third-party interoperability (e.g., with MATLAB, Python SciPy, or R-based hydrological modeling pipelines). Bluetooth 2.0 communication (Class 2, 10 m range) provides secure, low-latency telemetry between the probe and mobile device while simultaneously delivering regulated power to the sensor—eliminating the need for separate power cables in temporary installations. Export options include CSV, Excel, and GIS-ready shapefiles with georeferenced depth intervals.
Applications
- Deep vadose zone monitoring for groundwater recharge studies and contaminant transport modeling
- Long-term soil moisture budgeting in arid-zone agriculture and irrigation scheduling infrastructure
- Geotechnical stability assessment in landslide-prone slopes and dam embankments
- Carbon sequestration research requiring high-resolution root-zone and sub-root-zone moisture dynamics
- Regulatory compliance monitoring under EU Water Framework Directive (WFD) and US EPA Region 9 soil moisture guidance protocols
- Calibration and validation of cosmic-ray neutron sensors (CRNS) and satellite-based SMAP/SMOS soil moisture products
FAQ
What is the minimum recommended access tube inner diameter for reliable IPH50 probe deployment?
A minimum internal diameter of 50 mm is required to ensure unobstructed probe insertion and consistent electromagnetic coupling; 52 mm is preferred for long-term mechanical tolerance.
Can the TRIME-PICO-IPH50 operate continuously in frozen soils?
Operation below −15 °C requires optional low-temperature firmware and extended-range calibration; ice formation alters dielectric response nonlinearly, necessitating phase-specific calibration protocols.
Is the Bluetooth module compatible with modern iOS and Android devices?
Yes—Bluetooth 2.0 EDR mode ensures backward compatibility with legacy industrial PDAs; for smartphones, IMKO recommends using the optional USB-C serial adapter with dedicated Android APK or iOS companion app (v4.2+).
How frequently should field recalibration be performed?
Annual recalibration is advised for regulatory applications; for research-grade studies, recalibration is recommended after major soil disturbance events (e.g., tillage, excavation) or when EC exceeds 10 dS/m persistently.
Does the system support automated data telemetry via LoRaWAN or cellular gateways?
Not natively—but the HD2 reader’s RS-232 output and the Bluetooth module’s UART interface enable integration with third-party edge gateways supporting Modbus RTU or ASCII serial protocols for SCADA or cloud ingestion (e.g., AWS IoT Core, Azure IoT Hub).
