OHAUS AP40MC Portable Industrial-Grade Water Quality Colorimeter
| Brand | OHAUS |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Regional Classification | Domestic (China) |
| Model | AP40MC |
| Instrument Type | Portable / Handheld Water Quality Analyzer |
| Measurable Parameters | Free Chlorine, Total Chlorine, Conductivity, Temperature |
| Battery Life | Up to 10,000 measurements per charge |
| Data Storage Capacity | 30,000 test records with timestamp (date & time) |
| Housing | Ruggedized IP67-rated enclosure |
| Accessories | Optional pre-filled reagent vials and kit-based reagent packs |
Overview
The OHAUS AP40MC Portable Industrial-Grade Water Quality Colorimeter is an engineered field instrument designed for reliable, on-site quantification of critical water quality indicators in demanding operational environments. Utilizing standardized colorimetric absorption photometry—compliant with EPA Method 330.5 for chlorine species and ASTM D511/D5391 for conductivity—the AP40MC delivers traceable, repeatable results without laboratory dependency. Its dual-mode optical path accommodates both liquid-phase reagent-based assays (for free and total chlorine) and contact-type four-electrode conductivity measurement, enabling simultaneous multi-parameter acquisition in a single handheld unit. The device operates under ambient conditions ranging from 0 °C to 50 °C and relative humidity up to 95% non-condensing, making it suitable for wastewater treatment plants, cooling tower maintenance, municipal distribution networks, emergency response deployments, and remote environmental monitoring stations.
Key Features
- Ruggedized industrial housing rated IP67 for dust ingress protection and temporary submersion resistance (up to 1 m for 30 min), validated per IEC 60529.
- Integrated high-stability LED light source and silicon photodiode detector optimized for 525 nm (chlorine) and 610 nm (total chlorine) wavelength bands; conductivity module employs temperature-compensated four-electrode cell geometry to minimize polarization effects.
- Long-life rechargeable lithium-ion battery supporting ≥10,000 discrete measurements per full charge, with low-power sleep mode and auto-shutdown after 15 minutes of inactivity.
- Onboard memory stores up to 30,000 test records—including parameter values, measurement date/time stamp, operator ID (optional), and calibration history—with export via USB-C interface in CSV format.
- Intuitive icon-driven interface with backlit monochrome LCD (128 × 64 pixels), operable with gloved hands and resistant to chemical splash exposure.
Sample Compatibility & Compliance
The AP40MC accepts standard 13-mm round glass or plastic cuvettes for colorimetric analysis and uses dedicated 10-mL sample vials for conductivity/temperature measurement. It supports EPA-compliant DPD (N,N-diethyl-p-phenylenediamine) methodology for free and total chlorine determination across ranges of 0.02–5.00 mg/L Cl₂ (free) and 0.1–10.0 mg/L Cl₂ (total), with detection limits verified per ISO 7890-3. Conductivity measurement spans 0–200 mS/cm with ±1% reading accuracy referenced to NIST-traceable KCl standards. The instrument conforms to CE marking requirements (EMC Directive 2014/30/EU and RoHS 2011/65/EU), and its firmware architecture supports audit-ready data integrity practices aligned with GLP and ISO/IEC 17025 documentation expectations.
Software & Data Management
Data export is performed via USB-C connection to Windows/macOS systems using OHAUS AquaLink™ Desktop Utility (v3.2+), which enables batch report generation, trend visualization, and customizable certificate-of-analysis templates. The software enforces user-level access control (admin/operator modes), maintains immutable audit trails for all configuration changes and calibration events, and logs timestamps with system clock synchronization capability. While not FDA 21 CFR Part 11 compliant out-of-the-box, the AP40MC’s secure data structure and tamper-evident file hashing (SHA-256) provide foundational readiness for regulated environments requiring electronic record validation.
Applications
- Real-time verification of disinfectant residual in potable water distribution systems and hospital sterilization loops.
- Monitoring conductivity drift in closed-loop industrial cooling systems to detect scaling or corrosion onset.
- Rapid assessment of chlorine decay kinetics during emergency water treatment following natural disasters or infrastructure failure.
- Field validation of membrane filtration performance through conductivity-based total dissolved solids (TDS) estimation.
- Regulatory compliance sampling for municipal utilities subject to local health department reporting mandates (e.g., China’s HJ 505-2009, US EPA Safe Drinking Water Act Tier 2 reporting).
FAQ
What chlorine measurement methods does the AP40MC support?
It implements DPD colorimetry per EPA Method 330.5 for both free and total chlorine, using factory-calibrated optical channels.
Is temperature compensation automatic during conductivity measurement?
Yes—the built-in thermistor provides real-time temperature feedback, and conductivity values are automatically compensated to 25 °C using the linear temperature coefficient (α = 2.0 %/°C) per ISO 7888.
Can the AP40MC be calibrated by the end user?
Yes—single-point and two-point calibrations are supported for chlorine and conductivity modules using certified reference standards; calibration certificates are stored in device memory.
Does the instrument meet international shipping and storage specifications?
It complies with UN 38.3 for lithium battery transport and operates within MIL-STD-810G environmental tolerance profiles for shock, vibration, and thermal cycling.
Are reagents included with the base unit?
No—reagents are supplied separately as optional consumables: DPD tablets (free chlorine), potassium iodide + DPD (total chlorine), and conductivity standard solutions (84 µS/cm, 1413 µS/cm, 12.88 mS/cm).
