Hengping DCM-0506 Low-Temperature Constant-Temperature Circulator (Water/Oil Bath, Immersion Thermostatic Bath)

Overview

The Hengping DCM-0506 Low-Temperature Constant-Temperature Circulator is a compact, dual-mode (heating and refrigeration) thermal management system engineered for precision temperature control in laboratory and industrial R&D environments. Utilizing a hermetic compressor-based cooling system paired with resistive heating elements, the unit maintains stable thermal output across a broad operating range of −5 to 100 °C. Its design follows fundamental principles of convective heat transfer and closed-loop fluid dynamics: internal circulation ensures uniform thermal distribution within the 6 L stainless steel bath, while external circulation enables precise temperature coupling with auxiliary equipment—such as rotary evaporators, spectrometers, or reaction vessels—via insulated tubing. The circulator operates without reliance on tap water for condenser cooling, making it suitable for installation in controlled or space-constrained laboratory settings. Its microprocessor-based PID controller with self-tuning capability dynamically adjusts power delivery to minimize overshoot and sustain thermal stability at ±0.05 °C (measured at 25 °C with water or ethanol), meeting performance expectations for calibration-critical applications in metrology, QC/QA, and method validation workflows.

Key Features

• Compact footprint (462 × 265 × 665 mm) optimized for benchtop integration in analytical labs and pilot-scale facilities
• Dual-mode thermal regulation: simultaneous heating and active refrigeration using a sealed R134a compressor system
• High-precision Pt100 sensor with 0.01 °C display resolution and independent setpoint/actual temperature readouts
• Stainless steel inner bath (150 × 150 × 150 mm) and reinforced worktop for chemical resistance and mechanical durability
• Adjustable dual-circulation pump delivering 8–10 L/min flow rate, supporting both internal homogenization and external thermal transfer
• Integrated drain valve for safe, residue-free medium exchange—compatible with water, ethanol, silicone oil, and other low-viscosity heat-transfer fluids
• Robust enclosure with over-temperature, low-level, and dry-run protection circuits compliant with IEC 61010-1 safety standards

Sample Compatibility & Compliance

The DCM-0506 supports a wide range of thermal media—including deionized water, aqueous glycol mixtures, ethanol, and low-viscosity silicone oils—enabling application-specific optimization of thermal conductivity, flash point, and chemical inertness. Its temperature stability specification (±0.05 °C) aligns with requirements for ASTM E1137 (Standard Specification for Laboratory Thermometers) and ISO/IEC 17025-accredited calibration procedures involving reference thermometers and fixed-point cells. While not certified to GLP or GMP out-of-the-box, the device’s deterministic PID behavior, non-volatile parameter storage, and absence of proprietary firmware lock-in facilitate audit-ready documentation when integrated into validated systems. Users performing regulated testing (e.g., USP <1031> thermal analysis, ISO 17025-compliant viscosity measurements) may configure logging intervals and setpoint tolerances to support traceable data generation under internal SOPs.

Software & Data Management

The DCM-0506 operates via an embedded microcontroller interface with no external software dependency. All operational parameters—including setpoint, real-time bath temperature, pump status, and error codes—are displayed on a high-contrast LCD screen with tactile membrane keys. Though it lacks native USB/Ethernet connectivity or PC-based control software, its analog voltage output (0–5 V or 4–20 mA, configurable per OEM request) allows integration with programmable logic controllers (PLCs), SCADA systems, or data acquisition platforms for centralized monitoring. For laboratories requiring electronic records per FDA 21 CFR Part 11, third-party analog-to-digital converters with audit-trail-capable software (e.g., LabVIEW with NI DAQmx or DeltaV DCS modules) can be deployed to capture time-stamped temperature logs with user authentication and change history.

Applications

• Analytical Instrumentation: Thermal stabilization of CCD detectors, ATR-FTIR cells, UV-Vis cuvette holders, and ICP-MS sample introduction systems
• Chemical Synthesis: Precise temperature control for exothermic/endothermic reactions in jacketed reactors, flow chemistry modules, and hydrogenation setups
• Materials Characterization: Conditioning specimens prior to tensile testing, DSC calibration, XRD sample stage pre-equilibration, and SEM cryo-transfer staging
• Pharmaceutical R&D: Dissolution apparatus temperature verification (USP <711>), stability chamber challenge testing, and excipient crystallization studies
• Biotechnology: Maintaining optimal temperatures for enzyme kinetics assays, protein folding experiments, and bioreactor inoculum conditioning
• Physics & Engineering: Laser cavity cooling, vacuum chamber thermal shrouding, and calibration of thermocouple reference junctions

FAQ

What types of heat-transfer fluids are compatible with the DCM-0506?
Deionized water, 30–50% ethylene glycol/water mixtures, anhydrous ethanol, and silicone oils with kinematic viscosity ≤50 cSt at 25 °C are recommended. Avoid halogenated solvents or highly viscous media exceeding 100 cSt.
Can the unit maintain temperature stability below 0 °C with water as the medium?
No—water freezes at 0 °C. For sub-zero operation, use ethanol or glycol-based solutions with appropriate freezing-point depression.
Is external circulation pressure sufficient to drive fluid through a 2-meter coiled condenser?
Yes—the pump delivers up to 10 L/min at ≤0.2 bar backpressure, adequate for most standard glassware and jacketed accessories with smooth-bore tubing (ID ≥6 mm).
Does the DCM-0506 include RS232 or Ethernet communication interfaces?
No. It features only local front-panel control and optional analog process outputs. Digital interfacing requires external signal conditioning hardware.
What maintenance is required to ensure long-term thermal accuracy?
Annual verification of Pt100 sensor calibration against a NIST-traceable reference thermometer and periodic cleaning of the condenser coil (using compressed air or soft brush) are recommended. Compressor oil replacement is not user-serviceable.