Scientz DLK-5010 Low-Temperature Circulating Chiller

Overview

The Scientz DLK-5010 Low-Temperature Circulating Chiller is an engineered thermal management system designed for precise, stable, and reproducible temperature control in laboratory environments. Operating on the principle of vapor-compression refrigeration combined with resistive heating, the DLK-5010 delivers a continuously regulated fluid loop—either internally within its 10-liter stainless-steel bath or externally to connected instrumentation such as rotary evaporators, spectrometers, or atomic absorption graphite furnace systems. Its operational range spans from −5 °C up to ambient temperature, with high-resolution PID control ensuring thermal stability of ±0.1 °C under steady-state conditions. The unit employs R-134a refrigerant—a zero-ozone-depletion-potential (ODP = 0), low-global-warming-potential (GWP < 1430) alternative—aligning with modern environmental compliance standards including EU F-Gas Regulation (EU No 517/2014) and EPA SNAP program requirements.

Key Features

• 7-inch inclined capacitive touchscreen interface with intuitive graphical UI, enabling real-time monitoring of bath temperature, elapsed time, pump status, and system alarms
• Dual-mode circulation architecture supporting both internal bath homogenization and external load cooling/heating via adjustable flow (0–20 L/min) and pressure (up to 0.8 bar)
• Sealed, low-noise compressors sourced from Panasonic or Tecumseh—selected for long-term reliability, minimal acoustic emission (<52 dB[A] at 1 m), and consistent thermodynamic performance
• Programmable timer function allowing user-defined operation duration; automatic shutdown upon completion prevents unattended energy consumption
• Compact footprint (W × D × H ≈ 360 × 420 × 620 mm) optimized for benchtop integration without compromising thermal capacity or hydraulic head
• Comprehensive safety suite including compressor overheat detection, current overload cutoff, dry-run protection, and non-volatile memory retention of setpoints and operational history
• Auto-restart capability with configurable behavior: users may select either “standby mode” or “pre-cooling ramp” upon power restoration

Sample Compatibility & Compliance

The DLK-5010 is compatible with aqueous solutions, water-glycol mixtures (up to 30% v/v), and other non-corrosive heat-transfer fluids commonly used in analytical and preparative workflows. Its stainless-steel bath and fluoropolymer-sealed pump housing ensure chemical resistance against mild acids, bases, and organic solvents encountered in extraction, evaporation, and condensation protocols. The unit conforms to IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and meets CE marking criteria for electromagnetic compatibility (EN 61326-1) and low-voltage directive (2014/35/EU). While not certified for GMP production environments, its stable thermal output supports GLP-aligned validation studies—including IQ/OQ documentation—and satisfies temperature uniformity and repeatability requirements outlined in ASTM E1112 (Standard Specification for Constant-Temperature Liquid Baths) and ISO/IEC 17025:2017 Clause 7.2.2 (Method Validation).

Software & Data Management

The DLK-5010 operates autonomously via embedded firmware with no external PC dependency. All operational parameters—including target temperature, ramp rate, hold time, and pump speed—are stored in non-volatile memory and retained during power interruption. While the device lacks native Ethernet or USB data logging, its RS-485 serial interface (Modbus RTU protocol) enables integration into centralized lab infrastructure via third-party SCADA or LIMS platforms. Audit trail functionality is limited to on-screen event logs (e.g., “Compressor started”, “Temp deviation >0.3°C”), which can be manually exported via screenshot capture. For regulated environments requiring electronic records per FDA 21 CFR Part 11, external validation of interface communication and procedural controls must be performed by the end user.

Applications

• Rotary Evaporation Support: Provides consistent coolant delivery to 1–4 simultaneous rotovaps at evaporation temperatures up to 40 °C; eliminates dependence on municipal cooling water and maintains condenser efficiency even at ambient temperatures ≤10 °C
• Solid-Liquid Extraction: Enables Soxhlet and accelerated solvent extraction (ASE) workflows in feed, dairy, and food testing labs—ensuring repeatable cold trap temperatures independent of seasonal fluctuations
• Atomic Absorption Spectroscopy (AAS): Supplies stabilized cooling water to graphite furnace assemblies and flame atomizers, reducing thermal drift in absorbance measurements and extending component service life
• Reaction Calorimetry & Synthesis: Serves as a thermal sink/source for jacketed reactors and cryogenic condensers in fine chemical and pharmaceutical process development
• Material Testing: Supports thermal cycling of polymers, composites, and electronic components in physical property characterization per ASTM D696 and ISO 11359

FAQ

What is the maximum external load pressure the DLK-5010 can drive?
The unit delivers up to 0.8 bar (80 kPa) static pressure at the outlet port, sufficient for most laboratory-scale heat exchangers, condensers, and jacketed vessels.
Can the chiller operate continuously at −5 °C in a 30 °C ambient environment?
Yes—its cooling capacity is rated for continuous operation across the full −5 °C to ambient range under standard ventilation conditions (≥150 mm clearance on all sides).
Is glycol mixture compatible with the internal bath?
Water-glycol blends up to 30% (v/v) are permitted; higher concentrations may impair heat transfer efficiency and require recalibration of temperature sensors.
Does the DLK-5010 support remote start/stop via digital input?
No—only Modbus RTU communication is available for parameter readout; discrete I/O control is not implemented.
How often should maintenance be performed?
Annual inspection of refrigerant charge, compressor oil level, and condenser coil cleanliness is recommended; filter replacement every 12 months under typical usage.