Chu Ding Technology ZLSC-20 / ZLSC-10 / ZLSC-5 Stainless Steel Electric Double-Distillation Water Purifier with Auto Dry-Run Protection

Overview

The Chu Ding Technology ZLSC series stainless steel electric double-distillation water purifiers are engineered for reliable, continuous production of high-purity distilled water in regulated laboratory, clinical, and pharmaceutical environments. Based on the fundamental principle of thermal phase separation—where feed water is vaporized by resistive heating, condensed in a cooled secondary chamber, and collected as purified condensate—the ZLSC units implement a two-stage distillation process to significantly reduce non-volatile contaminants, ionic species, organic volatiles, and microbial load beyond the capability of single-stage systems. Each model (ZLSC-5, ZLSC-10, ZLSC-20) is rated for nominal output capacities of 5, 10, or 20 liters per hour respectively, operating at 380 V AC industrial supply with integrated thermal overload protection and real-time water-level sensing. The system’s core architecture conforms to ISO 3696:1987 Grade 2 water specifications when operated under validated conditions and maintained per manufacturer-recommended protocols.

Key Features

• Full-body construction from ASTM A240 304 stainless steel—resistant to corrosion, leaching, and thermal fatigue across repeated sterilization cycles
• Dual-chamber distillation design with thermally isolated primary evaporator and secondary condensation column, minimizing carryover and enhancing purity retention
• Automated dry-run protection system: integrated level sensor triggers immediate power cutoff upon detection of low reservoir level, preventing heater element damage
• Insulated control panel guard with ergonomic access—reduces surface temperature during extended operation and complies with IEC 61010-1 touch-safety requirements
• Built-in分流-style flow regulation (bypass-controlled condensate distribution) enabling consistent distillate flow rate and stable head pressure across variable load conditions
• Bi-directional adjustable flow valve for precise tuning of distillate collection rate without compromising condensation efficiency or thermal equilibrium
• Modular electrical interface with overcurrent protection, grounded chassis, and conformal-coated PCBs for long-term reliability in humid lab environments

Sample Compatibility & Compliance

The ZLSC series accepts municipal tap water, deionized water, or pre-filtered feedstock as input—provided total dissolved solids (TDS) do not exceed 500 ppm and free chlorine concentration remains below 2 mg/L to prevent accelerated scaling. Units are compatible with standard laboratory-grade glassware, polypropylene storage carboys, and stainless steel distribution manifolds. While not certified to ISO/IEC 17025 or FDA 21 CFR Part 11 out-of-the-box, the system supports integration into GLP/GMP workflows through documented operational qualification (OQ), preventive maintenance logs, and user-defined calibration intervals. All models meet CE marking requirements for electromagnetic compatibility (EN 61326-1) and low-voltage safety (EN 61010-1), and are designed to align with ASTM D1193-20 Type II water quality standards when operated within specified ambient and feedwater parameters.

Software & Data Management

The ZLSC series operates via hardwired electromechanical controls—no embedded firmware, touchscreen interface, or digital data logging is included. Operational status is indicated via LED indicators (power-on, heating active, low-water alarm). For laboratories requiring audit-ready records, external data acquisition is supported through optional analog voltage outputs (0–10 V DC) corresponding to heater duty cycle and reservoir level sensor signal, compatible with PLC-based SCADA systems or LabVIEW-compatible DAQ modules. Users may implement manual logbooks or electronic batch records in accordance with internal SOPs for traceability of daily output volume, maintenance events, and filter replacement dates.

Applications

• Preparation of reagent-grade water for analytical chemistry applications including HPLC mobile phase preparation, spectrophotometric blanking, and titrant dilution
• Feedstock purification for ultra-pure water (UPW) generation systems in semiconductor QA labs and biopharmaceutical cleanrooms
• Steam sterilizer reservoir replenishment in hospital central sterile supply departments (CSSD)
• Calibration standard preparation for conductivity and TOC analyzers requiring low-conductivity reference water
• Long-duration incubation media formulation where endotoxin-free, ion-depleted water is required
• Support of ISO 15189-accredited clinical pathology laboratories needing traceable, repeatable water quality for hematology and clinical chemistry analyzers

FAQ

What feedwater quality is recommended for optimal performance and service life?
Tap water with ≤500 ppm TDS and ≤2 mg/L free chlorine is acceptable; however, pretreatment with activated carbon filtration and softening is strongly advised to minimize scale formation and extend heating element service interval.
Is the ZLSC series compliant with USP Purified Water monograph requirements?
No—USP Purified Water requires additional controls (e.g., conductivity limits, microbial enumeration, endotoxin testing) not inherent to distillation alone; the ZLSC serves as a critical upstream purification step but must be paired with post-distillation monitoring and validation for USP compliance.
Can the unit operate continuously for 24/7 applications?
Yes—designed for unattended operation with auto-shutoff protection; however, scheduled shutdowns every 72 hours are recommended for descaling and visual inspection per maintenance guidelines.
Does the system include a built-in water quality monitor?
No—conductivity, TOC, or resistivity measurement is not integrated; users must deploy inline or offline meters for real-time water quality verification.
What is the expected service life of the heating elements under routine use?
With proper feedwater pretreatment and quarterly descaling, the nickel-chromium alloy heating elements typically exceed 12,000 operational hours before replacement is indicated.