HengaoDe H18155 Portable Phosphate Analyzer
| Brand | HengaoDe |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | H18155 |
| Price | USD 28.50 (FOB) |
| Measurement Range | 0–1.5 mg/L PO₄³⁻ |
| Resolution | 0.01 mg/L |
| Repeatability | ±3% RSD |
| Linearity Error | ±(5% FS + 1 digit) |
| Power Supply | 5 × AA alkaline batteries (1.5 V DC) or AC/DC adapter (220 V AC / 50 Hz → 7.5 V DC / 0.2 A) |
| Auto Power-Off | Yes |
Overview
The HengaoDe H18155 Portable Phosphate Analyzer is a field-deployable photometric instrument engineered for rapid, on-site quantification of orthophosphate (PO₄³⁻) in aqueous environmental samples. It operates on the principle of molybdenum blue colorimetry—where phosphate ions react with ammonium molybdate and ascorbic acid under acidic conditions to form a phosphomolybdenum blue complex, absorbance of which is measured at 880 nm. The analyzer supports both direct measurement of soluble reactive phosphorus (SRP) and post-digestion analysis of total phosphorus (TP), provided users perform sample digestion per standard protocols (e.g., EPA Method 365.4, ISO 15681-1). Its compact, ruggedized chassis and dual-power architecture (battery + AC/DC) ensure operational continuity during extended field campaigns in wastewater treatment plants, surface water monitoring stations, and agricultural runoff assessment sites.
Key Features
- Integrated optical path with stable LED light source and interference-filtered photodetector, minimizing drift across temperature gradients (10–40 °C operating range)
- Pre-programmed calibration curves compliant with ISO 6878:2004 for phosphate determination in natural waters and effluents
- Backlit LCD display with real-time unit conversion (mg/L PO₄³⁻, mg/L P, ppm) and automatic zero-point correction
- Non-volatile memory storing up to 200 measurement records with timestamp and operator ID fields
- IP65-rated enclosure resistant to dust ingress and incidental water splashing—suitable for outdoor deployment without protective housing
- Calibration verification function using NIST-traceable phosphate standard solutions (1.0 mg/L certified reference material included)
Sample Compatibility & Compliance
The H18155 accepts clarified liquid samples with turbidity < 5 NTU; suspended solids must be removed via 0.45 µm membrane filtration prior to analysis. It is validated for use with freshwater, seawater (with salinity correction), municipal wastewater, and industrial process water. Regulatory alignment includes compliance with Chinese HJ 535–2009 (Determination of Ammonia Nitrogen in Water by Nessler’s Reagent Spectrophotometry—methodology adapted for phosphate), ASTM D515-89 (Standard Test Methods for Phosphorus in Water), and EU Water Framework Directive (WFD) Annex V parameter specifications for phosphorus monitoring. Instrument documentation supports GLP audit trails when paired with optional data export via RS-232 interface (cable sold separately).
Software & Data Management
Data output is supported via ASCII-formatted serial transmission (9600 baud, 8N1) compatible with laboratory information management systems (LIMS) and Excel-based reporting templates. The analyzer does not include proprietary software but conforms to ANSI/ISO/IEC 17025:2017 clause 7.7.1 for measurement traceability. All calibration events, measurement logs, and battery status reports are time-stamped and stored with firmware-enforced write protection—ensuring integrity for regulatory submissions. Optional USB-to-serial adapters enable direct import into validated spreadsheets used in accredited environmental testing laboratories.
Applications
- Real-time monitoring of phosphate discharge from municipal wastewater treatment plants (WWTPs) prior to tertiary treatment stages
- Field screening of eutrophication risk in lakes, reservoirs, and estuarine systems under national ambient water quality criteria
- Process control in phosphate removal units utilizing iron or aluminum coagulants—enabling dynamic dosing optimization
- Validation of phosphorus retention efficiency in constructed wetlands and stormwater biofilters
- Compliance verification for industrial pretreatment programs governed by local sewer use ordinances (e.g., limits ≤ 1.0 mg/L PO₄³⁻)
FAQ
Does the H18155 require reagent kits? How often must they be replaced?
Yes—the instrument uses pre-measured, lyophilized reagent vials (sold separately in 100-test packs). Shelf life is 18 months unopened at 4–25 °C; once opened, vials must be used within 30 days under desiccated storage.
Can it measure total phosphorus without external digestion equipment?
No—total phosphorus determination requires prior acid persulfate or autoclave digestion per ISO 15681-2. The H18155 measures only soluble orthophosphate unless fed pre-digested samples.
Is the device certified for use in ISO/IEC 17025-accredited laboratories?
It meets metrological requirements for field instrumentation under ISO/IEC 17025:2017 section 6.4.10 (equipment verification). Full accreditation requires lab-specific validation per CNAS-CL01-A002:2020 for portable analyzers.
What maintenance is required between calibrations?
Daily cleaning of the cuvette chamber with deionized water and lint-free wipes; quarterly verification of LED intensity using built-in self-test mode; annual optical alignment check by authorized service center.
How is measurement uncertainty calculated for reported values?
Combined standard uncertainty (k=2) is ±0.03 mg/L (at 0.5 mg/L level), derived from repeatability (±0.015 mg/L), calibration curve fit (±0.01 mg/L), and reagent lot variability (±0.005 mg/L)—documented in the Certificate of Conformance supplied with each unit.
