OHAUS AP30AM Portable Photometric Water Quality Analyzer
| Brand | OHAUS |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Country of Origin | China |
| Model | AP30AM |
| Instrument Type | Portable / Handheld Photometer |
| Measured Parameter | Ammonia-Nitrogen (NH₃-N) |
| Light Source | Multi-wavelength LEDs |
| Detection Principle | Absorption Photometry (Fixed-Wavelength Spectrophotometry) |
| Data Storage | 5,000 measurement records |
| Power Supply | 4 × AAA batteries |
| Display | High-brightness OLED |
| Interface | Built-in micro-USB port |
| Enclosure Rating | IP67-rated waterproof and dustproof housing |
| Dimensions & Weight | Compact handheld form factor (<200 g, <180 mm length) |
| Auto-Power-Off | Yes |
| Standard Accessories | Carrying case, cuvette holder, calibration standards, reagent kits for NH₃-N |
Overview
The OHAUS AP30AM Portable Photometric Water Quality Analyzer is a field-deployable, fixed-wavelength photometer engineered for rapid, on-site quantification of ammonia-nitrogen (NH₃-N) in aqueous matrices. Based on absorption photometry principles—where analyte-specific colorimetric reactions generate light-absorbing complexes—the instrument employs precision-calibrated multi-wavelength LED sources to selectively excite and detect absorbance at wavelengths optimized for the indophenol blue method (ASTM D1426, ISO 7150-1). Unlike broad-spectrum spectrophotometers, the AP30AM utilizes discrete, thermally stabilized LEDs with narrow spectral bandwidths (±2 nm), minimizing stray light interference and enhancing measurement specificity under variable ambient lighting conditions. Its optical path is sealed and aligned during factory calibration to ensure long-term photometric stability without user recalibration. Designed for environmental technicians, plant operators, and regulatory inspectors, the AP30AM delivers traceable, repeatable results in accordance with standard methods used in drinking water compliance (e.g., US EPA Method 350.1), wastewater discharge monitoring, and industrial process control.
Key Features
- Optimized optical architecture with collimated LED illumination and matched silicon photodiode detection, delivering high signal-to-noise ratio and <±2% RSD repeatability across 0.02–5.0 mg/L NH₃-N range.
- Low-reagent consumption design: each test requires ≤1.0 mL sample and standardized pre-filled reagent vials, reducing hazardous waste generation and lowering cost-per-test.
- High-brightness OLED display with anti-glare coating ensures legibility in direct sunlight or low-light field environments (operating temperature: −10 °C to 50 °C).
- IP67-rated enclosure protects internal optics and electronics from dust ingress and immersion up to 1 m for 30 minutes—validated per IEC 60529.
- Integrated micro-USB interface enables direct data transfer to Windows/macOS systems without proprietary drivers; exports CSV-formatted logs with timestamp, operator ID, and calibration status flags.
- Intelligent power management extends battery life to ≥10,000 measurements per set of four AAA alkaline cells (typical usage).
Sample Compatibility & Compliance
The AP30AM is validated for use with clarified, non-turbid water samples—including potable water, surface water, effluent, cooling tower make-up, boiler feedwater, and swimming pool recirculation streams. Turbidity >5 NTU requires pre-filtration (0.45 µm membrane) prior to analysis to prevent scattering artifacts. The instrument complies with functional requirements outlined in ISO/IEC 17025:2017 for field testing equipment and supports GLP-compliant workflows via audit-trail-ready data export. While not FDA 21 CFR Part 11-certified out-of-the-box, its immutable timestamped records and operator-assigned IDs facilitate integration into regulated QA/QC programs requiring documented traceability.
Software & Data Management
No dedicated software installation is required. Measurement data—including date/time stamp, measured concentration, method ID, calibration reference value, and pass/fail flag against user-defined limits—is stored internally in non-volatile memory. Export occurs via drag-and-drop file transfer over micro-USB; no encryption or digital signature is applied, consistent with field instrumentation best practices. Users may import exported CSV files directly into LIMS platforms, Excel, or statistical analysis tools (e.g., JMP, Minitab) for trend reporting, control charting (X̄-R), or regulatory submission packages.
Applications
- Real-time verification of ammonia removal efficiency in biological nitrogen removal (BNR) processes at municipal wastewater treatment plants.
- Routine surveillance of NH₃-N accumulation in closed-loop cooling systems to prevent microbiologically influenced corrosion (MIC) and chloramine formation.
- Pre- and post-disinfection monitoring in drinking water distribution networks to assess breakpoint chlorination efficacy.
- Compliance checks for NPDES permits and state-level Total Maximum Daily Load (TMDL) reporting requirements.
- Field validation of laboratory-generated ammonia data during inter-laboratory comparison studies (ILCS).
FAQ
Is the AP30AM suitable for seawater or brackish water analysis?
Yes, provided samples are filtered and diluted to bring NH₃-N concentrations within the calibrated range; high chloride content does not interfere with the indophenol reaction under standard protocol conditions.
Does the instrument require annual factory recalibration?
No—optical alignment is permanent; users perform only performance verification using NIST-traceable NH₃-N standards before each sampling campaign.
Can custom calibration curves be loaded?
No—the AP30AM operates with a single, factory-verified curve for ammonia-nitrogen per ASTM D1426; method flexibility is limited to ensure regulatory defensibility.
What is the warranty coverage?
OHAUS provides a 24-month limited warranty covering materials and workmanship under normal field-use conditions; consumables (reagents, cuvettes) are excluded.
