DRETOP TDC-5015 Low-Temperature Constant-Temperature Bath

Overview

The DRETOP TDC-5015 Low-Temperature Constant-Temperature Bath is a precision-engineered circulating thermal control system designed for laboratory and industrial applications requiring stable, programmable temperature environments across an extended range of −50 °C to +100 °C. Utilizing a closed-cycle refrigeration system coupled with resistive heating elements and PID-controlled digital regulation, the unit maintains high thermal uniformity and reproducibility within its 15-liter stainless steel bath chamber. Its dual-mode operation—supporting both internal recirculation and external heat exchange via integrated pump and dual-port fluid connections—enables flexible integration into complex experimental setups, including calorimetry, viscometry, material property testing, and calibration of temperature-sensitive instrumentation. The system complies with fundamental engineering requirements for thermal stability in ISO/IEC 17025-accredited laboratories and supports GLP-aligned workflows when paired with validated operational protocols.

Key Features

• Stainless steel inner tank and work surface ensure long-term corrosion resistance against water, glycol-water mixtures, and mild organic solvents; exterior features durable electrostatic powder coating.
• Hermetically sealed compressor-based refrigeration system with dual-stage overheat and overcurrent protection for enhanced safety and service longevity.
• High-efficiency centrifugal circulation pump delivering consistent 13 L/min flow rate, supporting both internal thermal homogenization and external temperature transfer to auxiliary equipment (e.g., jacketed reactors, spectrophotometer cells, or environmental chambers).
• Dual-port fluid interface (inlet/outlet) allows seamless configuration for either closed-loop internal circulation (via connected silicone tubing) or open-loop external circulation (to external devices requiring precise thermal conditioning).
• LED-backlit digital controller with intuitive menu navigation provides real-time monitoring of setpoint, actual bath temperature, and system status; standard temperature resolution is 0.1 °C, with optional upgrades to 0.01 °C (U-series) or 0.001 °C (M-series) available upon specification.
• Thermally optimized bath geometry (300 × 280 × 180 mm working chamber; 260 × 220 mm opening) facilitates immersion of standard laboratory vessels while minimizing ambient heat ingress and evaporation loss.

Sample Compatibility & Compliance

The TDC-5015 accommodates a broad spectrum of thermal media—including deionized water (5–85 °C), 15% aqueous glycerol (85–95 °C), and specialized low-temperature fluids such as ethanol or silicone oil (down to −50 °C)—enabling compatibility with diverse sample types: biological specimens, polymer melts, pharmaceutical formulations, electronic components, and reference standards. All wetted surfaces are electropolished 304 stainless steel, meeting USP Class VI and ASTM F899 biocompatibility benchmarks where applicable. While not inherently 21 CFR Part 11-compliant, the system supports audit-trail-capable data logging when interfaced with third-party validated software platforms compliant with FDA and EMA regulatory expectations for instrument qualification (IQ/OQ/PQ) and GxP documentation.

Software & Data Management

The TDC-5015 operates via embedded firmware with no proprietary software dependency. Temperature setpoints, ramp rates, hold durations, and alarm thresholds are configured directly on the front-panel interface. For advanced data acquisition, the unit offers RS-232 or optional RS-485 serial output (Modbus RTU protocol), enabling integration with LabVIEW, MATLAB, or SCADA systems for time-stamped temperature logging, remote parameter adjustment, and automated test sequencing. When deployed in regulated environments, users may implement electronic record retention policies aligned with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) through externally managed data servers.

Applications

• Calibration of thermometers, RTDs, thermocouples, and infrared sensors across wide temperature spans.
• Thermal conditioning of samples prior to rheological, spectroscopic, or chromatographic analysis (e.g., pre-chilling HPLC columns or stabilizing DSC pans).
• Controlled-rate cooling/heating studies in polymer science, including crystallization kinetics and glass transition profiling.
• Stabilization of laser sources, photodetectors, and optical benches requiring sub-degree thermal drift suppression.
• Support of accelerated stability testing per ICH Q1 guidelines in pharmaceutical QA/QC laboratories.
• Environmental simulation for electronics reliability testing (e.g., thermal cycling of PCB assemblies).

FAQ

What temperature media are recommended for operation at −50 °C?
Ethanol, methanol, or specialized low-viscosity silicone oils are suitable below −20 °C; consult the Safety Data Sheet (SDS) of the selected fluid for compatibility with 304 stainless steel and pump seals.
Can the TDC-5015 be used for external cooling of a rotary evaporator condenser?
Yes—the external circulation mode delivers up to 13 L/min at stable setpoint temperatures; ensure inlet/outlet line diameters match the unit’s 10-mm barbed fittings and maintain adequate head pressure.
Is the unit compatible with 208 V / 60 Hz power supplies?
No—the TDC-5015 is rated exclusively for 380 V / 50 Hz three-phase input; voltage conversion requires an externally installed isolation transformer meeting IEC 61558-2-4 specifications.
Does the system include a drain valve for fluid replacement?
Yes—a bottom-mounted brass drain valve with PTFE seal enables complete bath emptying without disassembly.
What is the typical cooldown time from 20 °C to −40 °C with 15 L of ethanol?
Approximately 90–120 minutes under no-load conditions; actual performance varies with ambient temperature, fluid volume, and thermal mass of immersed objects.