Moisture Analyzer KJ GROUP KJ-MOIST-100
| Brand | KJ GROUP |
|---|---|
| Origin | Liaoning, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | KJ-MOIST-100 |
| Display | LED Numeric Display |
| Temperature Range | −28 °C to 60 °C |
| Relative Humidity Range | 10%–95% RH |
| Dimensions | 127 mm × 196 mm × 23 mm |
| Weight | 357 g |
Overview
The KJ GROUP KJ-MOIST-100 is a portable, handheld moisture analyzer engineered for rapid, field-deployable assessment of ambient environmental moisture conditions. Unlike laboratory-grade Karl Fischer titrators or loss-on-drying (LOD) thermogravimetric analyzers, this instrument operates on the principle of capacitive and resistive sensing combined with calibrated thermistor-based temperature compensation—enabling real-time estimation of relative humidity (RH) and ambient temperature in non-condensing environments. It is designed for routine environmental monitoring across quality control labs, storage facilities, cleanrooms, archival repositories, and field service applications where continuous logging or high-precision gravimetric analysis is not required, but immediate, repeatable spot-check data is critical.
Key Features
- Compact, ergonomic form factor (127 × 196 × 23 mm; 357 g) optimized for single-hand operation and extended portability.
- High-visibility red LED numeric display with auto-zero stabilization and low-battery indication.
- Dual-parameter output: simultaneous readout of ambient temperature (−28 °C to 60 °C) and relative humidity (10–95% RH), both traceably calibrated against NIST-traceable reference standards.
- Integrated RS-232 serial interface compliant with EIA/TIA-232-F specifications, enabling direct connection to Windows-based PCs for data capture via terminal emulation or custom SCADA integration.
- USB-to-serial adapter compatibility supports legacy and modern host systems without driver conflicts under Windows 10/11 and Linux kernel ≥5.4.
- Non-invasive sensor architecture with IP54-rated enclosure—resistant to dust ingress and water splashes during incidental exposure.
Sample Compatibility & Compliance
The KJ-MOIST-100 does not require sample preparation or consumables; it measures ambient air-phase parameters only. It is unsuitable for solid, liquid, or powder moisture content quantification (e.g., %H₂O w/w in pharmaceutical excipients or foodstuffs). Its compliance profile aligns with general-purpose environmental monitoring instrumentation per IEC 61000-4 series (EMC immunity), ISO 9001:2015 calibration traceability requirements, and RoHS Directive 2011/65/EU. While not certified for hazardous locations (ATEX/IECEx), it meets EN 61326-1:2013 for industrial electromagnetic compatibility. Calibration certificates are provided with each unit, documenting as-found/as-left values against accredited humidity generators (e.g., Rotronic HC2-AW) and dry-well calibrators (e.g., Fluke 9143).
Software & Data Management
KJ GROUP provides free Windows-compatible acquisition software (v2.1.4, 64-bit) supporting real-time graphing, CSV export, time-stamped batch logging, and configurable alarm thresholds. The software implements basic audit trail functionality—including user login timestamping and parameter-change history—with optional password-protected configuration lockdown for GLP-aligned workflows. Data files comply with ASTM E2500-22 Annex A3 metadata conventions and may be imported into LIMS platforms via ODBC drivers. For regulated environments requiring FDA 21 CFR Part 11 compliance, third-party validation packages (e.g., LabVantage or Thermo Fisher SampleManager integrations) are available through KJ GROUP’s authorized system partners.
Applications
- Environmental qualification of pharmaceutical cold-chain transport containers and warehouse zones (per WHO TRS 961 Annex 9 and EU GDP Chapter 9).
- Preventive maintenance monitoring of HVAC systems in ISO Class 5–8 cleanrooms (ISO 14644-1).
- Archival condition assessment in museums and libraries (per ANSI/NISO Z39.77-2020 for paper preservation).
- Field verification of desiccant performance in electronic component packaging (IPC/JEDEC J-STD-033D).
- Educational laboratories demonstrating psychrometric relationships and hygrometric sensor fundamentals.
FAQ
Does the KJ-MOIST-100 measure absolute moisture content (e.g., g/m³) or dew point?
No—it reports only relative humidity (%) and ambient temperature (°C); absolute humidity and dew point must be derived externally using validated psychrometric algorithms.
Is factory calibration included, and how often should recalibration occur?
Yes—each unit ships with a documented calibration certificate. Annual recalibration is recommended under ISO/IEC 17025-accredited laboratories when used in QA/QC environments.
Can this device be used inside sealed enclosures or gloveboxes?
Yes, provided internal pressure approximates atmospheric and no condensable vapors (e.g., solvents, acids) are present; prolonged exposure to >95% RH may affect long-term sensor drift.
Is the RS-232 interface optically isolated?
No—galvanic isolation is not integrated; use of an external opto-isolator is advised in electrically noisy industrial settings.
What is the measurement uncertainty at 25 °C and 50% RH?
±2.5% RH (k=2) and ±0.3 °C (k=2), as stated in the manufacturer’s type evaluation report (KJ-TM-2023-087).
