COM3800 Air Negative and Positive Ion Detector by KEW (Japan)

Overview

The COM3800 Air Negative and Positive Ion Detector is a precision environmental monitoring instrument engineered in Japan for quantitative, real-time measurement of both positive and negative air ion concentrations in ambient and controlled environments. It employs the Gerdien condenser principle — specifically, a concentric dual-cylinder electrode configuration conforming to JIS B 7950 (2019) — which ensures uniform electric field distribution and high measurement reproducibility even under dynamic airflow conditions. Unlike planar or parallel-plate ion sensors, this coaxial geometry minimizes edge effects and polarization errors, delivering superior accuracy across a wide dynamic range (0–5×10⁶ ions/cm³). The instrument is designed for field-deployable operation, integrating an internal rechargeable battery, onboard temperature and humidity sensing, and robust mechanical architecture suitable for outdoor natural environment surveys, indoor air quality assessments, cleanroom validation, and functional ion generator performance testing.

Key Features

• Simultaneous dual-polarity detection: Independent, real-time measurement of both positive and negative ion densities using a two-electrode Gerdien capacitor system.
• Four auto-ranging measurement scales (R1–R4): Enables high-resolution quantification from ultra-low background levels (0–8,000 ions/cm³) up to industrial-grade ion generator outputs (0–5,000,000 ions/cm³).
• JIS-compliant coaxial dual-cylinder sensor: Manufactured to Japanese Industrial Standard B 7950 specifications; certified by the Functional Ion Association of Japan (FIAJ) for data validity and traceability.
• Integrated environmental sensors: Onboard temperature (0–50.0 °C, ±1.0 °C) and relative humidity (5–95% RH, ±5% RH) monitoring for contextual correction and environmental correlation.
• Field-ready power architecture: Dual-power mode supports AC 100–240 V universal input and internal rapid-charge battery (≥5 h continuous operation), enabling extended mobile deployments without external power dependency.
• High-fidelity data capture: Internal memory stores time-stamped ion concentration values with standard deviation calculation per measurement cycle — a unique capability among commercial air ion analyzers.

Sample Compatibility & Compliance

The COM3800 is validated for use across diverse sampling environments: open-air natural settings (forests, mountains, coastal zones), indoor occupational spaces (offices, hospitals, schools), controlled environments (cleanrooms ISO Class 5–8, pharmaceutical manufacturing suites), and ionization equipment validation (bipolar ionizers, needle-point corona generators, HVAC-integrated emitters). Its sensor design inherently mitigates wind-induced turbulence artifacts, ensuring stable readings at air velocities up to 3 m/s. The instrument complies with JIS B 7950 (2019) “Method for Measurement of Air Ion Density” and meets the Functional Ion Association of Japan’s certification criteria for data integrity, including mandatory reporting of measurement uncertainty (standard deviation per acquisition interval). While not FDA- or CE-marked as a medical device, its metrological traceability supports GLP-aligned environmental health studies and product development testing under ISO 17025-accredited laboratory protocols.

Software & Data Management

Data acquisition and post-processing are supported via dedicated Windows-compatible software (English, Japanese, Korean, and Traditional Chinese language packs included). The software enables real-time graphing, time-series export (CSV/Excel), statistical analysis (mean, SD, min/max), and automated report generation with embedded environmental metadata. RS-232C serial interface provides bidirectional communication: users can configure sampling intervals (1, 5, 10, 15, 20, 30, or 60 seconds), initiate remote start/stop commands, and retrieve stored datasets directly from internal memory. Optional USB-to-RS232 adapters and wired/wireless LAN gateways extend integration into centralized building management systems (BMS) or IoT-based environmental monitoring networks. All software logs include audit-trail timestamps and user-defined project identifiers, supporting basic 21 CFR Part 11 readiness for non-regulated research applications.

Applications

• Environmental health research: Correlating airborne ion concentrations with biometeorological parameters in forest therapy (Shinrin-yoku) and urban green space studies.
• Indoor air quality (IAQ) assessment: Validating efficacy of commercial ionizers in offices, hotels, and healthcare facilities per ASHRAE Guideline 24-2022.
• Functional material evaluation: Quantifying ion emission rates from textiles, paints, ceramics, and construction materials per FIAJ Test Method No. 001.
• Cleanroom and controlled environment monitoring: Detecting electrostatic discharge (ESD) risk factors and verifying neutralization efficiency in semiconductor fabrication and aseptic processing areas.
• Academic instrumentation: Used in university atmospheric physics labs for teaching ion mobility principles and calibrating secondary reference standards.

FAQ

Does the COM3800 require annual calibration?

Yes — for traceable measurements, we recommend annual recalibration against a NIST-traceable ion source or accredited calibration laboratory per JIS Z 8401. Field zero-checks using the built-in offset verification function are advised before each measurement session.
Can it measure ions in polluted or high-particulate air?

The sensor is susceptible to contamination by aerosols >1 µm in diameter. For reliable operation in dusty or industrial environments, optional inlet filters (0.3 µm HEPA-rated) and periodic electrode cleaning per maintenance manual are required.
Is the RS-232C interface compatible with modern laptops lacking serial ports?

Yes — USB-to-RS232 adapters compliant with FTDI chipset drivers are fully supported. Driver installation and COM port mapping instructions are provided in the English-language software manual.
What does “standard deviation recording” mean in practice?

For each measurement interval, the instrument computes and stores the arithmetic mean ion density plus its standard deviation — enabling statistical confidence assessment without post-hoc data reprocessing.
Is printer output mandatory for data validation?

No — the DP-U245 thermal printer is optional. All regulatory-grade documentation (e.g., for ISO 17025 audits) must originate from the software-exported CSV files, which retain full timestamping, sensor ID, and environmental metadata.