JiDa-Xiaotianshe GDYS-101SN Portable Residual & Total Chlorine Analyzer

Overview

The JiDa-Xiaotianshe GDYS-101SN is a field-deployable, microprocessor-controlled photometric analyzer engineered for rapid, on-site quantification of residual chlorine and total chlorine in aqueous matrices. It operates on the standardized N,N-diethyl-p-phenylenediamine (DPD) colorimetric method—fully aligned with GB/T 5750.11–2006, the Chinese national standard for drinking water quality analysis. The instrument employs a fixed-wavelength optical system (typically centered at 515 nm or 530 nm, optimized for DPD-chlorine complex absorbance), integrated solid-state photodetector, and embedded calibration algorithm to convert measured absorbance into concentration values in mg/L. Its compact, battery-powered architecture enables uninterrupted operation in resource-constrained environments—including municipal water distribution points, wastewater treatment outfalls, swimming pool maintenance stations, and emergency response deployments—without reliance on laboratory infrastructure.

Key Features

• Field-optimized portable design with ruggedized housing (IP65-rated enclosure) and rechargeable Li-ion battery supporting ≥8 hours of continuous use
• Pre-programmed dual-channel measurement mode: automatic switching between residual chlorine and total chlorine protocols via intuitive soft-key interface
• Integrated thermal printer for immediate hard-copy documentation of results, including timestamp, sample ID, operator code, and measurement mode
• Onboard memory storing up to 500 test records with export capability via USB 2.0 to CSV-compatible spreadsheet software
• Factory-calibrated using traceable NIST-traceable chlorine standards; user-accessible calibration verification function with reference check strips
• Zero-drift compensation algorithm mitigates ambient light interference and photodetector thermal drift during extended field use

Sample Compatibility & Compliance

The GDYS-101SN is validated for direct analysis of unfiltered, non-turbid water samples across diverse environmental and regulatory contexts: potable water (including chloraminated systems), treated wastewater effluent, cooling tower water, seawater (with salinity correction applied per GB/T 5750.11–2006 Annex B), surface water, and distilled/deionized water used in pharmaceutical clean utilities. It complies with method performance criteria outlined in GB/T 5750.11–2006 for precision (relative standard deviation ≤5%), accuracy (recovery 90–110% for spiked samples), and detection capability. While not certified to ISO/IEC 17025 or EPA Method 334.0, its operational methodology is functionally equivalent to ASTM D1253–22 (Standard Test Method for Chlorine in Water) and USP for purified water testing when used under controlled field conditions.

Software & Data Management

Data integrity is maintained through an audit-ready logging system that captures date/time stamp, operator ID (user-defined alphanumeric code), sample identification number, measurement mode, raw absorbance value, calculated concentration, and pass/fail status relative to user-set action limits. All entries are write-protected upon saving and cannot be edited post-acquisition. USB data export generates time-stamped, comma-delimited files compatible with LIMS integration or routine QA/QC reporting. Firmware updates are performed via secure USB flash drive, with version rollback capability retained for GLP-compliant validation continuity. The device supports 21 CFR Part 11–compliant optional software modules (sold separately) for electronic signature, role-based access control, and full audit trail generation—meeting requirements for regulated water quality monitoring in GMP and ISO 9001-certified facilities.

Applications

• Real-time verification of disinfectant residual at water treatment plant exit points and distribution system nodes
• Regulatory compliance monitoring for municipal wastewater discharge permits (e.g., NPDES requirements)
• Swimming pool and spa facility daily safety checks per WHO Guidelines for Safe Recreational Water Environments
• Emergency response screening during natural disasters or infrastructure failures affecting water safety
• Validation of point-of-use (POU) and point-of-entry (POE) chlorine removal systems
• Field research in limnology and marine environmental studies requiring rapid halogen speciation

FAQ

Does the GDYS-101SN require external power for field use?
No—it operates exclusively on an internal rechargeable lithium-ion battery with ≥8 hours of runtime and includes a universal AC/DC adapter for charging.

Can the instrument distinguish between free chlorine and combined chlorine?
It measures residual chlorine (primarily free chlorine in most applications) and total chlorine. Combined chlorine is derived by subtraction (Total – Residual), consistent with standard practice per GB/T 5750.11–2006.

Are reagents supplied with the instrument?
Yes—each unit ships with one starter kit containing 100 pre-measured DPD reagent tablets (50 for residual, 50 for total chlorine) and 100 matching vials with calibrated fill lines.

What maintenance is required?
Routine cleaning of the cuvette chamber and optical path with lint-free cloth and deionized water; annual verification of photometric accuracy using manufacturer-provided neutral density filters.

Is firmware upgrade support available beyond initial purchase?
Yes—free firmware updates are provided for the first two years post-purchase via the manufacturer’s secure portal, including method enhancements and regulatory alignment patches.