Scientz DLK-5003 Low-Temperature Circulating Chiller

Overview

The Scientz DLK-5003 Low-Temperature Circulating Chiller is an engineered thermal management system designed for precise, stable, and repeatable temperature control of external laboratory equipment and internal bath environments. Operating on the principle of closed-loop refrigeration with integrated heating capability, it delivers consistent cooling and heating performance across a range from −5 °C to ambient temperature. The unit employs environmentally compliant refrigerant (R134a or equivalent, per current regional regulatory standards) and utilizes high-reliability components—including sealed compressors from Panasonic or Tecumseh—to ensure long-term operational integrity under continuous duty cycles. Its dual-mode circulation architecture supports both internal bath homogenization and external load conditioning—making it suitable for applications requiring stable thermal sinks or sources, such as rotary evaporator condensers, spectrophotometer jackets, graphite furnace AAS cooling systems, and reaction calorimetry setups.

Key Features

• 7-inch angled capacitive touchscreen interface with real-time display of setpoint, actual temperature, elapsed time, and system status—optimized for legibility at benchtop viewing distance
• Microprocessor-based PID temperature controller with adaptive tuning algorithms for rapid stabilization and minimal overshoot
• High-pressure circulation pump (up to 0.3 MPa head pressure) enabling reliable fluid delivery to elevated or resistance-prone external systems
• Integrated timer function with programmable run duration; automatic shutdown upon completion to prevent unattended operation risks
• Comprehensive safety architecture including compressor overheat protection, current overload cutoff, low-level liquid alarm, and dry-run prevention
• Compact footprint (W × D × H ≈ 320 × 380 × 520 mm) minimizing spatial demand in crowded analytical laboratories
• Power recovery logic: user-configurable auto-start or standby cooling mode following power interruption—preserving setpoint and operational history

Sample Compatibility & Compliance

The DLK-5003 is compatible with aqueous, ethylene glycol–water mixtures (up to 30% v/v), and silicone oil media within its specified temperature range. It meets essential design requirements outlined in ISO/IEC 17025:2017 for calibration-supporting equipment and aligns with general laboratory safety expectations under IEC 61010-1. While not certified for GMP or FDA 21 CFR Part 11 out-of-the-box, its digital control logs (when interfaced via optional RS485/Modbus) support audit-ready data capture when integrated into validated workflows. The unit complies with RoHS Directive 2011/65/EU regarding hazardous substance restrictions and uses ozone-friendly refrigerants conforming to Montreal Protocol phase-out schedules.

Software & Data Management

The embedded firmware supports local parameter logging (temperature, runtime, error codes) stored in non-volatile memory with retention exceeding 10,000 cycles. Optional communication modules enable integration with LabVIEW, MATLAB, or SCADA platforms via Modbus RTU protocol. No proprietary cloud service or vendor-hosted software is required; all configuration and monitoring occur locally through the touchscreen or serial interface. Audit trail functionality—including timestamped setpoint changes and fault events—is available when connected to external data acquisition systems meeting GLP-compliant metadata tagging standards.

Applications

• Rotary Evaporation: Provides stable condenser cooling for 1–4 simultaneous rotovaps at evaporation temperatures up to 40 °C—eliminating dependence on municipal water supply and insulating processes from seasonal ambient fluctuations
• Atomic Absorption Spectroscopy (AAS): Supplies regulated coolant flow to graphite furnace assemblies and flame atomizer housings, maintaining thermal equilibrium critical for signal stability and matrix interference reduction
• Lipid Extraction (Soxhlet & Accelerated Solvent Extraction): Delivers reproducible condenser temperatures independent of lab HVAC conditions—essential for quantitative fat analysis in food, feed, and dairy QA/QC protocols
• Reaction Temperature Control: Serves as external thermal jacket for jacketed reactors, crystallizers, or polymerization vessels where precise exothermic/endothermic management is required
• Material Testing: Supports thermal cycling and controlled-rate cooling in physical property characterization (e.g., viscosity, phase transition, thermal expansion)

FAQ

What fluids are compatible with the DLK-5003?
Deionized water, 20–30% ethylene glycol/water mixtures, and low-viscosity silicone oils (cSt ≤ 50 at 25 °C) are approved. Avoid chlorinated solvents, strong acids/bases, or fluids exceeding 100 cP viscosity.
Can the unit operate continuously at −5 °C?
Yes—continuous operation at minimum setpoint is supported provided ambient temperature remains below 30 °C and ventilation clearance (≥10 cm rear/side) is maintained.
Is external temperature feedback supported?
The standard configuration includes only internal bath sensor feedback. An optional PT100 input port allows connection of an external probe for process-critical load monitoring.
How is temperature stability verified?
Stability is measured per ASTM E2779–18: after 30 minutes at setpoint, deviation must remain within ±2 °C across the entire bath volume using NIST-traceable calibrated thermistors.
Does the chiller meet UL or CE safety certification?
The DLK-5003 carries CE marking per Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU. UL listing is not included but can be arranged for OEM integration under custom certification pathways.