Kasahara RC-V2 Portable High-Range Residual Chlorine and Chlorine Dioxide Analyzer
| Brand | Kasahara |
|---|---|
| Origin | Japan |
| Model | RC-V2 |
| Instrument Type | Portable |
| Measurement Principle | DPD Spectrophotometry |
| Measured Parameters | Chlorine Dioxide (ClO₂) and Total/Free Available Chlorine |
| Measurement Range | 0–200 g/L (multi-range, auto-ranging) |
| Accuracy | ±5% of reading |
| Repeatability | ≤2% RSD |
| Detection Limit | 0.01 mg/L (at lowest range) |
| Wavelengths | Triple-wavelength optical system (515 nm, 550 nm, 610 nm) |
| Compliance | Designed for HACCP-aligned disinfection process control |
| Power Supply | Rechargeable Li-ion battery (≥8 hrs continuous operation) |
Overview
The Kasahara RC-V2 is a purpose-engineered portable spectrophotometric analyzer designed for precise, field-deployable quantification of chlorine dioxide (ClO₂) and total/free available chlorine across an exceptionally wide concentration span—from trace-level residuals (0.01 mg/L) to industrial-strength chlorination solutions (up to 200 g/L). Unlike conventional single-range residual chlorine meters, the RC-V2 implements a five-mode adaptive measurement architecture grounded in the standardized N,N-diethyl-p-phenylenediamine (DPD) colorimetric method (ISO 7393-2, APHA 4500-Cl G). Its triple-wavelength optical detection system (515 nm, 550 nm, 610 nm) dynamically selects optimal excitation and reference bands per selected range, minimizing interferences from turbidity, colored organics, and oxidant cross-reactivity—critical for accurate analysis in complex matrices such as wastewater effluent, chlorinated cooling tower water, or food-grade sanitizing solutions.
Key Features
- Five programmable measurement modes covering discrete concentration tiers: 0–0.5 mg/L, 0.1–5 mg/L, 1–50 mg/L, 10–500 mg/L, and 0.1–200 g/L—enabling optimized signal-to-noise ratio and photometric linearity across orders of magnitude.
- Triple-wavelength photometric engine with automatic wavelength selection and real-time baseline correction, eliminating manual filter changes and reducing operator-induced variability.
- Integrated solid-state cuvette holder with precision optical alignment and temperature-stabilized LED light sources (±0.2°C), ensuring measurement reproducibility under ambient field conditions (10–40°C).
- Pre-calibrated DPD reagent tablets (Type A & Type C) stored in humidity-sealed cartridges; each batch traceably certified to NIST-traceable chlorine standards.
- IP67-rated enclosure with chemical-resistant silicone keypad and splash-proof optical window—certified for use in wet, high-humidity environments including food processing floors and wastewater pump stations.
- On-device data logging (≥2,000 results with timestamp, operator ID, and calibration history) compliant with basic GLP documentation requirements.
Sample Compatibility & Compliance
The RC-V2 delivers reliable performance across diverse aqueous matrices without sample dilution in most operational ranges. Validated applications include potable water distribution systems, hospital sterilization rinse water, school kitchen sanitizing tanks, aquaculture recirculation units, and municipal wastewater disinfection contact basins. It meets functional equivalency to ISO 7393-2 for chlorine dioxide and ISO 7393-1 for free chlorine, and supports audit-ready documentation for HACCP Critical Control Point (CCP) monitoring. While not FDA 21 CFR Part 11-certified out-of-the-box, its immutable audit trail (calibration logs, result timestamps, user IDs) provides foundational traceability required for GMP-aligned environmental monitoring programs.
Software & Data Management
Data export is supported via USB-C interface to standard CSV format. The included Kasahara DataLink desktop utility (Windows/macOS) enables batch calibration validation, trend charting across multiple instruments, and generation of PDF reports containing measurement metadata, QC checks, and pass/fail flags against user-defined action limits. Firmware updates are delivered via signed binary packages with SHA-256 verification to maintain integrity in regulated settings.
Applications
- Verification of chlorine dioxide dosing efficacy in membrane bioreactor (MBR) effluent disinfection.
- Routine monitoring of hypochlorite-based sanitizers in ready-to-eat (RTE) food production lines.
- Emergency response testing of emergency drinking water supplies post-natural disaster.
- Validation of chlorine decay kinetics in cooling water treatment programs.
- Compliance sampling for state-level wastewater discharge permits requiring ClO₂ residual reporting.
- Process control in pharmaceutical clean-in-place (CIP) systems where oxidant concentration must be verified pre-rinse.
FAQ
Does the RC-V2 require daily recalibration?
No—factory calibration remains stable for ≥30 days under normal use; however, a 2-point verification (zero and mid-range standard) is recommended before each shift when used in critical CCP applications.
Can it distinguish between chlorine dioxide and chlorite ion (ClO₂⁻)?
Yes—the triple-wavelength algorithm suppresses chlorite interference by >92% at pH 6.5–7.5; for samples with known high chlorite content (e.g., sodium chlorite stock solutions), the optional “Chlorite Compensation Mode” applies empirically derived correction factors.
Is the instrument compatible with third-party DPD reagents?
Only Kasahara-certified DPD tablets (Cat. No. DPD-RCV2-A/C) are validated for use; non-OEM reagents may compromise accuracy due to inconsistent dye purity and reaction kinetics.
What maintenance is required beyond routine cleaning?
Annual optical path inspection and LED intensity verification by authorized Kasahara service centers; no user-serviceable optical components are present.
How is measurement uncertainty reported in compliance documentation?
The device embeds combined uncertainty (k=2) per ISO/IEC 17025 Annex A, calculated from repeatability, calibration standard uncertainty, and wavelength drift tolerance—visible in exported CSV metadata fields “U_k2_mg_L” and “U_rel_%”.
