Duling DL-R2 Ultra Pure Water System
| Brand | Duling |
|---|---|
| Origin | Anhui, China |
| Manufacturer Type | Authorized Distributor |
| Country of Manufacture | China |
| Model | DL-R2 |
| Price Range | USD 4,200 – 7,000 (FOB) |
| Purified Water Grade | ASTM Type II Reagent Water |
| Resistivity | 1–105 MΩ·cm @ 25 °C |
| Heavy Metals & Soluble Silica | < 0.1 ppb |
| Total Organic Carbon (TOC) | < 3 ppb |
| Microbial Count & Endotoxins | < 0.002 EU/mL |
| Particles (> 0.1 µm) | < 1 particle/mL |
Overview
The Duling DL-R2 Ultra Pure Water System is an integrated, dual-stage laboratory water purification platform engineered to deliver consistent ASTM Type II reagent-grade water and ultrapure water meeting stringent analytical and life science requirements. It employs a sequential purification architecture comprising pre-treatment (activated carbon + sediment filtration), reverse osmosis (RO), electrodeionization (EDI), and final polishing via dual-wavelength UV oxidation (185 nm + 254 nm) and a 0.1 µm terminal filter. This multi-barrier design ensures removal of ions, organics, particulates, microorganisms, and endotoxins—critical for applications demanding low background interference, including HPLC mobile phase preparation, cell culture media formulation, molecular biology assays, and trace elemental analysis. The system operates under continuous recirculation with real-time resistivity monitoring, enabling stable output within the 1–105 MΩ·cm range at 25 °C—a performance envelope aligned with ISO 3696:1987 Class 2 and CLSI EP21-A guidelines for purified water used in clinical and research laboratories.
Key Features
- Integrated dual-loop distribution: Primary loop maintains constant flow and temperature stability; secondary loop enables point-of-use delivery without compromising purity.
- Real-time conductivity/resistivity sensor with automatic temperature compensation (ATC) calibrated to NIST-traceable standards.
- Onboard 185/254 nm UV lamp assembly for advanced TOC reduction—achieving < 3 ppb residual organic carbon through photo-oxidation of non-volatile organics.
- Final 0.1 µm hydrophilic PES membrane filter certified for bacterial retention (log reduction value ≥ 7) and endotoxin exclusion (LRV ≥ 4).
- Programmable dispensing modes: volume-based, time-based, and continuous flow—with adjustable flow rate (0.5–2.0 L/min) and auto-purging cycle scheduling.
- Touchscreen HMI with multilingual UI (English, German, French, Spanish), audit trail logging, and password-protected configuration access compliant with GLP documentation requirements.
Sample Compatibility & Compliance
The DL-R2 is validated for compatibility with standard laboratory glassware, polypropylene and fluoropolymer reservoirs, and stainless-steel distribution manifolds. Its output meets or exceeds specifications defined in multiple international standards: ASTM D1193-20 (Type II water), ISO 3696:1987 (Grade 2), CLSI EP21-A (for clinical lab water), and USP Purified Water monograph. While not intended for direct injection into parenteral preparations, its endotoxin level (< 0.002 EU/mL) and particle count ( 0.1 µm) satisfy preparatory requirements for sterile filtration and aseptic processing environments. All wetted materials—including RO membranes, EDI stacks, and UV quartz sleeves—are FDA-compliant and extractables-tested per USP .
Software & Data Management
The embedded control firmware supports data export via USB 2.0 and optional Ethernet/Wi-Fi modules. Logged parameters include date/time-stamped resistivity, TOC, UV lamp intensity, filter service life, and alarm history. Exported CSV files are compatible with LIMS integration and support 21 CFR Part 11–compliant electronic signatures when paired with third-party validation packages. System diagnostics include predictive maintenance alerts based on cumulative usage hours, pressure differentials across stages, and UV lamp decay modeling—ensuring traceability and facilitating scheduled calibration per ISO/IEC 17025 quality management protocols.
Applications
- HPLC and UHPLC mobile phase preparation where low ionic and organic background minimizes baseline noise and column fouling.
- Preparation of buffers and reagents for ELISA, PCR, qRT-PCR, and next-generation sequencing workflows.
- Cell culture media supplementation requiring endotoxin-free water to prevent TLR4-mediated inflammatory responses in mammalian systems.
- Atomic absorption spectroscopy (AAS), inductively coupled plasma mass spectrometry (ICP-MS), and ion chromatography (IC) blank minimization.
- Calibration standard dilution in environmental testing labs accredited to ISO/IEC 17025.
FAQ
What is the recommended service interval for the RO membrane and EDI stack?
RO membranes require replacement every 12–24 months depending on feed water quality (TDS < 200 ppm recommended); EDI stacks are rated for 3–5 years under continuous operation with proper pretreatment.
Does the DL-R2 support remote monitoring via LAN or cloud platforms?
Yes—optional Ethernet module enables SNMP-based network monitoring and integration with building management systems (BMS) or centralized lab infrastructure dashboards.
Can the system be validated for GMP environments?
The DL-R2 supports IQ/OQ documentation templates and provides raw data logs required for qualification; full PQ must be conducted in situ per user-defined acceptance criteria and local regulatory expectations.
Is the 0.1 µm final filter sterilizing grade?
It is classified as a high-efficiency particulate retentive (HEPR) filter meeting ASTM F838-20 for bacteria retention, but it is not designated as “sterilizing grade” per ISO 13408-1; terminal sterilization remains the responsibility of downstream processes.
How does the system handle seasonal variations in municipal feed water quality?
Adaptive pre-treatment controls adjust carbon bed flushing frequency and RO recovery ratio in response to real-time inlet conductivity and turbidity inputs—minimizing scaling risk and maintaining consistent product water quality year-round.
