Hengping DC-0506A LCD Display Low-Temperature Constant-Temperature Bath Circulator

Overview

The Hengping DC-0506A LCD Display Low-Temperature Constant-Temperature Bath Circulator is a precision-engineered thermal management system designed for laboratory environments requiring stable, uniform, and programmable liquid temperature control across a wide operational range (−5 to 100 °C). It operates on the principle of active refrigeration and resistive heating regulated by a microprocessor-controlled PID algorithm with auto-tuning capability, ensuring rapid thermal response and minimal overshoot. Temperature is measured continuously via a calibrated Pt100 platinum resistance sensor mounted in direct contact with the bath medium, delivering high fidelity feedback for closed-loop regulation. The unit integrates a hermetic single-stage compressor (R134a or equivalent CFC-free refrigerant), optimized heat exchanger geometry, and vacuum-insulated polyurethane foam housing—collectively minimizing thermal leakage and maximizing energy efficiency. Its dual-circulation architecture supports both internal homogenization and external temperature field extension, making it suitable for applications ranging from sample conditioning to auxiliary temperature control of peripheral instruments.

Key Features

• Microprocessor-based PID temperature controller with self-tuning functionality, achieving ±0.05 °C stability at 25 °C (water or ethanol medium)
• Large-format backlit LCD display showing setpoint, real-time bath temperature, and operational status simultaneously
• Dual-mode circulation: high-efficiency internal recirculation (8 L/min flow rate) ensures uniform thermal distribution; external circulation enables closed-loop temperature control of secondary systems (e.g., reaction jackets, condensers, or spectroscopic cells)
• SUS304 stainless steel bath chamber and deck—corrosion-resistant, non-reactive, and compliant with GLP handling requirements for aqueous and organic solvent use
• Comprehensive safety architecture including over-temperature/under-temperature alarms, low-level liquid detection with dry-run prevention, compressor overheat and overcurrent protection, and sensor open-circuit diagnostics
• Ergonomic design: foldable side handles, R-cornered front panel for operator safety, and removable air-intake grilles for routine condenser maintenance
• CFC-free refrigeration system meeting international environmental compliance standards (EU F-Gas Regulation, EPA SNAP)

Sample Compatibility & Compliance

The DC-0506A accommodates standard laboratory vessels (beakers, flasks, cuvettes) up to 150 mm × 150 mm × 150 mm in dimension, immersed directly into the 6 L working volume. Compatible heat transfer media include deionized water (0–100 °C), 30–50% aqueous ethylene glycol (−20 to 100 °C), or anhydrous ethanol (−40 to 80 °C), selected per application-specific thermal and chemical compatibility requirements. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and conforms to electromagnetic compatibility standards EN 61326-1:2013. While not certified for medical device use under ISO 13485, its temperature stability and traceable Pt100 sensing support validation protocols aligned with ASTM E1137/E1137M (Standard Specification for Temperature Uniformity of Laboratory Ovens) and USP (Thermal Analysis).

Software & Data Management

The DC-0506A operates as a standalone instrument with no embedded software stack; however, optional RS232/RS485 interfaces (Modbus RTU protocol) enable integration into centralized lab automation platforms. When equipped, users may log temperature setpoints, actual readings, alarm events, and runtime statistics via third-party SCADA or LIMS systems. Optional features include a 1–30 segment programmable temperature ramping module (for accelerated aging or thermal cycling tests) and an extended PT100 probe for real-time external loop monitoring—both supporting audit-trail-capable data recording when paired with compliant host software. No local data storage or FDA 21 CFR Part 11 electronic signature functionality is provided natively.

Applications

This circulator serves as a primary thermal source in analytical, materials, and life science laboratories. Typical uses include: stabilization of optical components (e.g., CCD detectors, laser diodes); temperature control of rotary evaporators, viscometers, and refractometers; calibration of thermocouples and RTDs per ISO/IEC 17025; thermal preconditioning of polymer samples prior to DSC or TGA analysis; and auxiliary cooling/heating of chromatographic columns, ICP-MS nebulizers, or NMR probe housings. In industrial QA/QC settings, it supports ASTM D2570 (viscosity-temperature relationships), ISO 293 (plastic molding), and pharmacopeial dissolution testing where precise bath temperature is critical to result reproducibility.

FAQ

What temperature media are compatible with the DC-0506A?

Deionized water (0–100 °C), 30–50% ethylene glycol/water mixtures (−20 to 100 °C), and anhydrous ethanol (−40 to 80 °C) are validated. Avoid chlorinated solvents or strong oxidizers due to material compatibility constraints.

Does the unit support external temperature feedback control?

Yes—when fitted with the optional extended PT100 probe, the system can regulate external loops using dual-sensor mode (internal bath + external process), maintaining setpoint accuracy within ±0.1 °C at the remote location.

Is the temperature stability specification valid across the full range?

The ±0.05 °C stability is verified at 25 °C with water or ethanol. At temperature extremes (e.g., −5 °C or 100 °C), stability degrades slightly to ±0.1 °C due to increased thermal gradient stress and reduced refrigerant efficiency.

Can the bath be used for long-term unattended operation?

Yes—provided ambient conditions remain stable (20–25 °C, low vibration, adequate ventilation), and the low-level fluid protection remains functional. Routine inspection of condenser cleanliness every 3 months is recommended for sustained performance.

What safety certifications does the DC-0506A carry?

It meets IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and EN 61326-1:2013 (EMC for Laboratory Equipment). CE marking is applied per EU Directive 2014/30/EU (EMC) and 2014/35/EU (LVD).