IMKO SONO-M2 Rapid Aggregate Moisture Analyzer

Overview

The IMKO SONO-M2 Rapid Aggregate Moisture Analyzer is a field-deployable, time-domain reflectometry (TDR)-based instrument engineered for high-reproducibility moisture quantification in coarse granular materials used in concrete production and civil engineering applications. Unlike oven-drying or capacitance-based methods, the SONO-M2 applies TRIME-TDR (Time-Domain Reflectometry with Integrated Moisture Evaluation) technology—where an electromagnetic pulse propagates along a coaxial probe, and the reflected waveform’s travel time and attenuation are correlated to the bulk dielectric permittivity of the surrounding medium. Since water exhibits a dielectric constant (~80) significantly higher than dry aggregates (typically 3–6), even trace moisture content induces measurable shifts in signal velocity and reflection coefficient. This principle enables non-destructive, in-situ measurement within heterogeneous, high-density media such as crushed stone (up to 32 mm particle size), expanded clay, gravel, and sand—without requiring sample homogenization or extraction. The probe’s optimized geometry and extended insertion depth (up to 2 m via optional extension rods) ensure representative volumetric sampling across stratified stockpiles or conveyor-fed material streams.

Key Features

• TRIME-TDR measurement principle ensures immunity to salinity-induced drift, enabling stable operation across variable electrical conductivity ranges (0–5 dS/m).
• Integrated temperature sensor (±0.5°C accuracy) compensates for thermal effects on dielectric response across −15°C to +50°C ambient conditions.
• Pre-programmed calibration curves for standard aggregates—including natural sand, crushed limestone, basalt gravel, and lightweight expanded clay—reduce setup time and eliminate empirical curve-fitting.
• User-configurable calibration storage supports up to 15 material-specific curves, allowing traceable adaptation to proprietary blends or regional aggregate sources.
• IP68-rated PVC probe housing ensures operational reliability in wet, dusty, or abrasive environments typical of batching plants and quarry sites.
• Low-power design (100 mA @ 12 V DC) enables battery-powered operation or integration into PLC-controlled process monitoring systems via standardized 7-pin interface.

Sample Compatibility & Compliance

The SONO-M2 is validated for direct insertion into unscreened, un-compacted aggregates with maximum particle sizes up to 32 mm. Its measurement volume (~1.0 L, Ø130 × 100 mm cylinder) provides statistically robust averaging across heterogeneous distributions—critical for quality assurance in ASTM C1602 (Standard Specification for Mixing Water Used in Production of Hydraulic Cement Concrete) and EN 206-1 (Concrete – Part 1: Specification, Performance, Production and Conformity). The device supports GLP-compliant data logging when paired with IMKO’s TRIME-PC software, maintaining audit trails for moisture records required under ISO 9001:2015 Clause 8.5.2 (Identification and Traceability) and EN 12350-8 (Testing Fresh Concrete – Part 8: Sampling). No regulatory certification is implied for food, pharmaceutical, or medical use.

Software & Data Management

Data acquisition and configuration are managed through IMKO’s TRIME-PC desktop application (Windows-compatible), which supports real-time display, batch export to CSV/Excel, and timestamped measurement history with operator ID tagging. The software enforces version-controlled calibration file management and generates PDF reports compliant with internal QA documentation standards. While the SONO-M2 itself does not implement FDA 21 CFR Part 11 electronic signature functionality, its output files may be archived within validated LIMS or MES platforms meeting ALCOA+ (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) data integrity requirements.

Applications

• Real-time correction of water dosage in concrete batching plants—enabling adherence to ±5 L/m³ formulation tolerance when processing 1800 kg/m³ aggregate batches.
• Moisture profiling of stockpiled aggregates prior to crushing or screening operations.
• Verification of drying efficiency in thermal or solar aggregate dryers.
• Field validation of moisture content in road base materials per AASHTO T 265 and ASTM D2216 protocols.
• Process feedback control in automated ready-mix facilities interfaced via analog 4–20 mA or Modbus RTU outputs (optional module).

FAQ

Can the SONO-M2 measure moisture in frozen aggregates?
No. Ice has a dielectric constant (~3.2) close to that of dry mineral matter, rendering TDR ineffective below 0°C. Measurements must be conducted above freezing point.
Is probe recalibration required after physical damage to the tip?
Yes. Any deformation affecting the coaxial impedance profile invalidates factory calibration. Replacement probes require revalidation using certified reference materials.
Does the device comply with explosion-proof (ATEX) requirements?
No. The SONO-M2 is rated for general industrial use only and is not certified for Zone 1/2 hazardous areas.
Can it be used underwater?
No. Although IP68-rated for temporary submersion, continuous immersion compromises long-term seal integrity and introduces hydrostatic pressure artifacts in TDR signal interpretation.
How frequently should field verification against gravimetric analysis be performed?
Per ISO 11274 and ASTM D4944, quarterly verification is recommended for critical production environments; monthly checks are advised where aggregate composition varies significantly between deliveries.