JiDa Little Swan GDYS-501M Aquaculture Water Quality Analyzer

Overview

The JiDa Little Swan GDYS-501M Aquaculture Water Quality Analyzer is a portable, microprocessor-controlled spectrophotometric instrument engineered for rapid, on-site quantitative analysis of critical water quality parameters in aquaculture environments. It operates on the principle of colorimetric absorbance measurement—where analyte-specific chemical reactions generate colored complexes whose optical density is linearly proportional to concentration across defined wavelength bands. The system integrates fixed-wavelength LED sources (380–630 nm), precision optical path alignment, and temperature-stabilized photodiode detection to deliver field-deployable performance without sacrificing laboratory-grade reproducibility. Designed explicitly for freshwater and brackish-water aquaculture operations—including shrimp, tilapia, carp, and ornamental fish farms—the GDYS-501M supports routine monitoring of nitrogen species (ammonia-N, nitrite-N, nitrate-N), dissolved oxygen (DO), sulfide, phenol, pH, salinity, and temperature. Its compact form factor (1.7 kg), dual-power architecture (AC mains + internal Li-ion battery), and ruggedized housing enable reliable operation in humid, non-climate-controlled hatcheries, pond-side stations, and mobile lab vans.

Key Features

• Integrated optical module: Co-aligned LED light source, sample chamber, and photodiode detector minimize stray light and path-length variability; no moving parts or mechanical filters required.
• Pre-programmed calibration curves: Factory-loaded, parameter-specific absorbance-concentration algorithms eliminate manual standard curve preparation—enabling direct concentration readout after reagent addition.
• Dual-cuvette compatibility: Supports both 16-mm cylindrical glass vials (for sealed, single-step color development) and standard 5-cm rectangular cuvettes—optimized for method flexibility and cross-laboratory comparability.
• Onboard data management: Internal memory stores ≥500 test records with timestamp, operator ID, sample ID, and measured value; supports statistical functions (mean, SD, CV%) for QC batch evaluation.
• Field-ready power system: Rechargeable 7.4 V / 900 mAh lithium-ion battery provides ≥6 hours of continuous operation; automatic low-battery warning and graceful shutdown prevent data loss.
• Robust human-machine interface: 4.7-inch backlit LCD with tactile touch-sensitive keys ensures legibility under ambient sunlight and operability with wet gloves.
• Regulatory-aligned design: Firmware supports audit trail generation (user login, method selection, result entry, export actions); complies with GLP documentation requirements for farm-level QA/QC programs.

Sample Compatibility & Compliance

The GDYS-501M is validated for use with untreated or filtered aquaculture water samples (surface pond, recirculating aquaculture systems [RAS], nursery tanks, and transport containers). Sample volume requirements range from 5 mL (for DO, pH, salinity modules) to 25 mL (for sulfide and phenol assays). All included reagent kits conform to APHA Standard Methods (e.g., 4500-NH₃ F, 4500-NO₂⁻ B, 4500-O₂ G) and GB/T 5750 (China National Standards) for drinking and aquatic environmental water testing. Instrument performance meets ISO 8466-1:1993 (calibration of analytical instruments) repeatability criteria (±5% RSD) and is suitable for routine compliance monitoring under national aquaculture water quality standards (e.g., NY 5051-2001, China’s “Fishery Water Quality Standard”).

Software & Data Management

The GDYS-501M runs embedded firmware supporting standalone operation and PC-based data synchronization. Local storage retains full metadata per measurement: date/time stamp, selected parameter, raw absorbance, calculated concentration, operator code, and sample identifier. USB and RS-232 interfaces enable bidirectional communication with Windows-based desktop software, which exports results in native .CSV and Excel-compatible .XLSX formats. Exported files include column headers compliant with LIMS ingestion protocols (e.g., “Sample_ID”, “Parameter”, “Result_mg/L”, “Detection_Limit_mg/L”, “Operator”, “Instrument_SN”). Audit logs record all configuration changes and user authentication events—supporting traceability in GLP-regulated farm certification audits.

Applications

• Routine pond health assessment: Daily tracking of ammonia-N spikes during feeding cycles or algal bloom events.
• Hatchery water quality control: Monitoring nitrite-N accumulation in larval rearing tanks to prevent brown blood disease.
• RAS system optimization: Quantifying nitrate-N buildup and DO depletion across biofilter and degassing stages.
• Feed trial support: Correlating water chemistry shifts (e.g., pH drift, sulfide generation) with feed formulation changes.
• Regulatory reporting: Generating auditable datasets for provincial fisheries bureau submissions and organic aquaculture certification (e.g., NOP, ASC).
• Extension service deployment: Used by agricultural extension officers for farmer training and real-time advisory interventions.

FAQ

Does the GDYS-501M require daily recalibration?
No. Factory-loaded calibration curves remain stable for ≥12 months under normal storage conditions. A single-point verification using certified reference standards is recommended before each daily work session.
Can the instrument measure unfiltered pond water?
Turbid samples must be centrifuged or filtered (0.45 µm membrane) prior to analysis for nitrogen species and phenol to avoid scattering interference. DO and pH measurements may be performed directly on homogenized samples.
Is the firmware upgradeable in the field?
Yes. Firmware updates are delivered via USB drive and installed through the instrument’s system menu—no external programmer or service technician required.
Are reagent kits supplied with lot-specific certificates of analysis?
All GDYS-certified reagent kits include CoA documentation specifying batch number, expiration date, linearity range, and detection limit—traceable to NIM (National Institute of Metrology, China) reference materials.
What is the warranty coverage?
Standard warranty is 24 months from date of shipment, covering parts and labor for defects in materials or workmanship. Extended service plans including annual optical verification and preventive maintenance are available upon request.