Shenchanghong CHYP-250 Phosphate Analyzer
| Brand | Shenchanghong |
|---|---|
| Model | CHYP-250 |
| Type | Benchtop Laboratory Analyzer |
| Measurement Range | 0.00–50.00 mg/L PO₄³⁻ (as P) |
| Resolution | 0.01 mg/L |
| Accuracy | ≤ ±5% FS |
| Repeatability | ≤ 3% RSD |
| Optical Stability | ≤ 0.002 A/20 min |
| Dimensions (H×W×D) | 130 × 266 × 200 mm |
| Power Consumption | 30 W |
| Weight | < 2 kg |
| Compliance | Designed for ASTM D515-89, ISO 6878:2004, and EPA Method 365.1 workflows |
Overview
The Shenchanghong CHYP-250 Phosphate Analyzer is a benchtop spectrophotometric instrument engineered for precise, routine quantification of orthophosphate (PO₄³⁻) in aqueous environmental samples. It operates on the principle of molybdenum blue colorimetry—where phosphate reacts with ammonium molybdate and antimony potassium tartrate under acidic conditions to form a phosphomolybdate complex, subsequently reduced by ascorbic acid to yield an intensely blue-colored heteropoly compound. Absorbance is measured at 880 nm using a stable cold-light LED source and narrow-band optical filter, minimizing spectral drift and ambient light interference. The analyzer is calibrated for direct reporting in mg/L as phosphorus (P), aligning with standard regulatory reporting conventions used in wastewater treatment plants, municipal laboratories, and environmental monitoring agencies.
Key Features
- High-stability cold-light LED source with fixed 880 nm emission wavelength ensures consistent photometric performance without thermal drift or lamp aging effects.
- Integrated 128×64 dot-matrix LCD display enables full local operation—including method selection, calibration, sample measurement, curve management, and data review—without external PC dependency.
- V/F (voltage-to-frequency) signal conversion combined with software-based redundancy and watchdog timer logic enhances electromagnetic compatibility (EMC) and operational robustness in industrial lab environments.
- Non-volatile memory stores up to 10 user-defined calibration curves and 99 measurement records with timestamp, sample ID, and operator code—retained during power loss per IEC 60730-1 Class B requirements.
- Factory pre-calibrated with NIST-traceable phosphate standards; supports two-point or multi-point user calibration using certified reference materials (CRMs) compliant with ISO/IEC 17025 internal calibration procedures.
- Enclosure fabricated from post-molded ABS with UV-stabilized and chemical-resistant surface finish, rated IP20 for laboratory use and compatible with common decontamination agents (e.g., 10% v/v ethanol, 0.1% sodium hypochlorite).
Sample Compatibility & Compliance
The CHYP-250 is validated for use with clarified, filtered, or digested liquid samples meeting standard pretreatment criteria defined in EPA Method 365.1 and ISO 6878:2004. It accommodates sample volumes of 10–50 mL and accepts standard 10 mm pathlength cuvettes (glass or quartz). Interference mitigation protocols are embedded for common matrix constituents including silicate (up to 200 mg/L SiO₂), nitrate (≤ 50 mg/L), and chloride (≤ 1000 mg/L), per ASTM D515-89 Annex A1. Instrument design conforms to IEC 61010-1:2010 safety standards for electrical equipment for measurement, control, and laboratory use. While not 21 CFR Part 11–enabled out-of-the-box, audit trail functionality can be implemented via optional USB data export and third-party LIMS integration.
Software & Data Management
All instrument firmware is field-upgradable via micro-USB interface. Calibration curves are stored with metadata (date, operator ID, standard lot number), supporting GLP-aligned recordkeeping. Measurement data exports in CSV format for traceable post-processing in Excel, MATLAB, or validated laboratory information management systems (LIMS). Built-in diagnostics monitor LED intensity decay, detector linearity, and zero-drift trends—generating maintenance alerts when deviations exceed predefined thresholds per ISO/IEC 17025 clause 6.4.2.
Applications
- Regulatory compliance testing of municipal wastewater effluent for phosphorus discharge limits (e.g., EU Urban Wastewater Treatment Directive, US Clean Water Act NPDES permits).
- Process control in tertiary wastewater treatment plants employing biological phosphorus removal or chemical precipitation with FeCl₃/Al₂(SO₄)₃.
- Surface water quality assessment in eutrophication-sensitive watersheds, including lakes, reservoirs, and estuaries.
- Industrial pretreatment verification for food processing, fertilizer manufacturing, and semiconductor rinse water streams.
- Educational laboratories conducting AP Environmental Science or undergraduate analytical chemistry experiments on nutrient cycling and water chemistry.
FAQ
What sample pretreatment is required prior to analysis?
Samples with turbidity > 5 NTU or suspended solids > 20 mg/L must be centrifuged (3000 rpm, 10 min) or filtered through 0.45 µm membrane filters. Digestion per Standard Methods 4500-P E is required for total phosphorus determination.
Can the CHYP-250 measure total phosphorus directly?
No—it measures orthophosphate only. Total phosphorus requires acid persulfate digestion prior to analysis using an external digestion block or autoclave.
Is the instrument compatible with international calibration standards?
Yes—calibration is traceable to NIST SRM 3140a (phosphate in water) and certified reference materials from LGC, Accustandard, or Spex CertiPrep.
Does the analyzer support multi-laboratory data harmonization?
Yes—CSV export includes ISO 8601 timestamps, instrument serial number, and method version identifier, enabling cross-site QA/QC correlation per ILAC-G8:2022 guidelines.
What maintenance intervals are recommended for long-term accuracy?
LED output intensity and blank absorbance should be verified weekly; full calibration with CRMs every 30 days or after reagent batch change; optical path cleaning with lens-grade tissue and isopropanol biweekly.
