English Product Name

Overview

The Hengping DLSB-6/20 Integrated Circulating Chiller is a precision-engineered refrigeration system designed for stable, continuous thermal management in laboratory and pilot-scale applications. It operates on a vapor-compression refrigeration cycle with a hermetically sealed compressor, enabling reliable low-temperature fluid circulation across a wide operational range (−20 °C to +99 °C). Unlike air-cooled chillers, the DLSB-6/20 employs a water-cooled condenser configuration—optimized for environments where ambient heat dissipation is constrained or where consistent cooling performance must be maintained under variable room conditions. The unit integrates a stainless steel (SUS304) fluid reservoir, corrosion-resistant circulation loop, and adjustable flow pump into a single compact chassis, eliminating external plumbing complexity while preserving thermal fidelity and long-term fluid integrity.

Key Features

• Stable temperature control with ±0.1 °C fluctuation tolerance, achieved via PID-regulated digital thermostat and high-resolution Pt100 sensor feedback.
• 6-liter open-bath reservoir with large-diameter port (Φ210 mm), supporting both internal bath immersion and external closed-loop circulation to auxiliary equipment.
• Corrosion-resistant fluid path constructed from SUS304 stainless steel and chemically inert polymer components—compatible with aqueous, ethylene glycol/water, and propylene glycol-based coolants.
• Adjustable centrifugal circulation pump delivering up to 10 L/min at 3 bar maximum head pressure, with flow throttling capability for matched thermal load distribution.
• Continuous-duty refrigeration architecture featuring R404A or R507 refrigerant (subject to regional compliance), optimized for rapid cooldown and sustained operation without duty-cycle interruption.
• Front-panel digital interface with dual-display: setpoint temperature and real-time bath temperature—both shown in 0.1 °C resolution.

Sample Compatibility & Compliance

The DLSB-6/20 is routinely deployed in conjunction with rotary evaporators, jacketed glass reactors, vacuum freeze dryers, laser systems, analytical spectrometers (e.g., ICP-MS coolant loops), and electrophoresis apparatuses requiring precise thermal stabilization. Its fluid compatibility extends to standard laboratory coolants—including 30–50% aqueous glycol mixtures—ensuring freeze protection down to −30 °C without compromising viscosity or thermal conductivity. While not certified to ISO/IEC 17025 or FDA 21 CFR Part 11 out-of-the-box, the chiller supports GLP/GMP-aligned workflows when integrated into validated lab environments: its stable thermal output enables reproducible reaction kinetics, crystallization studies, and QC testing per ASTM E2877 (Standard Guide for Thermal Stability Testing) and ISO 17025 Clause 5.4.2 (Equipment Verification). Optional calibration certificates traceable to NIM (National Institute of Metrology, China) are available upon request.

Software & Data Management

The DLSB-6/20 operates as a standalone instrument with no embedded data logging or network connectivity. All operational parameters—including setpoint, actual temperature, pump status, and compressor runtime—are monitored locally via the front-panel display. For integration into automated laboratories, analog 4–20 mA or 0–10 V output signals (available via optional I/O module) enable connection to SCADA, LabVIEW, or DeltaV systems for remote monitoring and alarm triggering. Users performing regulated work may implement external temperature data loggers compliant with 21 CFR Part 11 requirements—recording timestamps, operator IDs, and deviation alerts—to satisfy audit trails for GxP environments. Firmware updates are performed manually via USB interface; version history and calibration logs must be retained per internal SOPs.

Applications

• Condenser cooling for rotary evaporation under reduced pressure, maintaining solvent recovery efficiency across volatile compound libraries.
• Temperature control of jacketed bioreactors and fermenters during microbial or mammalian cell culture, ensuring metabolic consistency within ±0.2 °C.
• Cooling support for high-power analytical instruments—including X-ray diffractometers and Raman spectrometers—where thermal drift directly impacts spectral resolution.
• Low-temperature crystallization trials in pharmaceutical process development, where controlled ramp rates (0.1–2 °C/min) and hold stability are critical for polymorph screening.
• Thermal conditioning of test fixtures in materials science labs—e.g., tensile testing machines or DMA analyzers—requiring uniform thermal gradients across specimen zones.

FAQ

What coolant fluids are recommended for use with the DLSB-6/20?

Deionized water is suitable for operation above 5 °C. For sub-zero applications, a 30–40% (v/v) mixture of propylene glycol and deionized water is recommended to prevent freezing and minimize corrosion. Ethylene glycol is not advised due to higher toxicity and regulatory restrictions in many academic and pharmaceutical facilities.
Can the DLSB-6/20 be used with external heat exchangers or plate chillers?

Yes—the unit’s 3 bar pressure rating and 10 L/min flow capacity support integration with external heat exchange modules, provided total system pressure drop remains below 2.5 bar and fluid compatibility is verified.
Is the reservoir insulated? Does it require an external insulating jacket?

The 6 L stainless steel tank features 25 mm polyurethane foam insulation. No additional jacketing is required for standard lab environments (15–25 °C); however, in high-humidity or elevated ambient (>30 °C) settings, supplementary vapor-barrier cladding may reduce condensation and improve energy efficiency.
What maintenance intervals are recommended for long-term reliability?

Compressor oil and refrigerant levels should be verified annually by qualified service personnel. The circulation filter (located inline before the pump inlet) requires cleaning every 6 months or after 1,000 operating hours—whichever occurs first. Coolant replacement is advised every 12 months or when pH falls below 6.5 or conductivity exceeds 150 µS/cm.
Does the DLSB-6/20 comply with CE or UL safety standards?

The unit conforms to GB 4793.1–2019 (Chinese national standard equivalent to IEC 61010-1) for laboratory electrical equipment safety. CE marking is not applied; UL certification is not held. Export customers requiring UL/ETL listing must engage third-party certification agencies for product-specific evaluation.