Orion AQ3700 Total Phosphorus and Total Nitrogen Multiparameter Water Quality Analyzer
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | Orion AQ3700 |
| Pricing | Available Upon Request |
Overview
The Orion AQ3700 is a rugged, IP67-rated portable photometric water quality analyzer engineered for reliable field and laboratory quantification of total nitrogen (TN) and total phosphorus (TP), alongside over 70 pre-programmed methods covering nutrients, metals, disinfectants, and general water quality parameters. It employs high-stability LED light sources and fixed-wavelength photometry (430, 530, 560, 580, 610, and 660 nm) to deliver reproducible absorbance measurements compliant with standard methods including EPA 365.4 (TP), EPA 351.2 (TN), ISO 6878 (TP), and ISO 11905-1 (TN). Unlike traditional wet-chemistry approaches requiring reflux digestion or expensive glassware, the AQ3700 utilizes rapid, closed-vessel persulfate oxidation—completed in 30 minutes at 100 °C—to mineralize organic and particulate nitrogen and phosphorus into nitrate and orthophosphate, respectively. This enables full TN/TP analysis within one hour, supporting real-time process control in wastewater treatment plants, compliance monitoring under NPDES permits, and source water assessment for eutrophication risk.
Key Features
- IP67 ingress protection rating—fully dust-tight and submersible up to 1 m for 30 minutes, enabling operation in harsh outdoor or plant-floor environments.
- Dual-channel persulfate digestion capability via optional AQUAfast digester (compatible with both 13 mm and 16 mm digestion tubes), eliminating cross-contamination and ensuring consistent thermal profiles.
- High-integrity optical system: Long-life LEDs with ±0.005 Abs photometric resolution and ±2% full-scale accuracy across all wavelengths.
- Intuitive interface with 12-key numeric pad, three dedicated function keys, and backlit LCD display supporting multilingual prompts (English, Spanish, French, German).
- Integrated infrared (IR) data transfer for secure, cable-free export of measurement records—including date/time stamps, method ID, sample ID, and raw absorbance values—to PCs or LIMS.
- Auto-ranging photometry and per-method blank calibration reduce operator error and improve inter-laboratory comparability.
- On-board memory stores up to 1,000 test results with metadata; firmware and method updates delivered via RJ45 Ethernet connection.
Sample Compatibility & Compliance
The AQ3700 accommodates 10 mL sample volumes using standardized 13 mm ampoules, 16 mm test tubes, or 24 mm vials—each supported by dedicated adapters. Its digestion protocols align with U.S. EPA-approved methodologies for regulatory reporting: low-range TN (0.5–25 mg/L N, Method ACD004) and high-range TN (5–150 mg/L N, Method ACD007); TP quantification (0.02–1.1 mg/L P, Method ACD095). All reagent kits are manufactured under ISO 9001-certified processes and include lot-specific certificates of analysis. The instrument supports GLP-compliant workflows through traceable blank subtraction, method version logging, and audit-ready data export. While not inherently 21 CFR Part 11 compliant, its data integrity framework—combined with external LIMS integration—facilitates alignment with GMP and environmental QA/QC requirements.
Software & Data Management
The AQ3700’s embedded software provides method-driven measurement logic—not generic absorbance reading. Each of the 70+ built-in programs defines wavelength, reagent sequence, timing, calibration curve type (linear, quadratic, or user-defined), and pass/fail criteria. Users may create custom methods via PC-based configuration utility, assigning unique IDs, units, and alarm thresholds. All measurements are time/date stamped and stored with full contextual metadata. IR transmission exports CSV-formatted files compatible with Excel, LabArchives, or enterprise LIMS platforms. Firmware updates preserve user-defined methods and historical data, ensuring continuity during regulatory audits.
Applications
- Wastewater treatment: Monitoring TN/TP removal efficiency across primary, secondary, and tertiary treatment stages to verify compliance with discharge limits (e.g., <1 mg/L TP, <10 mg/L TN).
- Drinking water source protection: Quantifying nutrient loading in reservoirs and rivers to assess algal bloom potential and inform watershed management plans.
- Industrial effluent screening: Rapid verification of pretreatment performance for facilities discharging to municipal sewers (e.g., food processing, pharmaceutical manufacturing).
- Environmental field surveys: Simultaneous measurement of TP, TN, COD, ammonia, nitrate, and orthophosphate using a single handheld platform—reducing equipment logistics and training burden.
- Educational laboratories: Teaching fundamental principles of spectrophotometric analysis, oxidation-reduction chemistry, and regulatory method validation.
FAQ
What digestion method does the AQ3700 use for total nitrogen and total phosphorus?
It uses alkaline potassium persulfate digestion at 100 °C for 30 minutes—consistent with EPA 351.2 and EPA 365.4.
How many measurements can be performed on a single battery charge?
Over 3,000 photometric readings per full charge using standard AA alkaline batteries.
Does the instrument support automatic calibration curve generation?
Yes—each method includes factory-loaded calibration curves; users may also input custom standards or perform multi-point calibration.
Can the AQ3700 store and export raw absorbance values?
Yes—raw Abs values at selected wavelengths are recorded with every measurement and exported alongside calculated concentrations.
Is the AQUAfast digester required for TN/TP analysis?
While not mandatory, the AQUAfast digester is strongly recommended to ensure uniform temperature control, reproducible digestion kinetics, and operator safety during high-temperature oxidation steps.
