Hengping DC-0506 Digital Cryogenic Circulating Thermostat

Overview

The Hengping DC-0506 Digital Cryogenic Circulating Thermostat is a precision-engineered temperature control platform designed for laboratory environments requiring stable, uniform thermal conditions across a wide operational range (–5 °C to +100 °C). It operates on the principle of active refrigeration combined with high-fidelity microprocessor-controlled PID regulation, enabling precise thermal management for both internal bath applications and externally coupled systems. The unit employs a CFC-free single-stage compressor system optimized for rapid cooldown and low-noise operation, supported by a dual-path circulation architecture that maintains thermal homogeneity via an 8 L/min magnetically coupled, heatless centrifugal pump. Its Pt100 sensor ensures traceable, NIST-compatible temperature measurement with 0.1 °C display resolution and ±0.05 °C stability at 25 °C — performance validated under standard ambient conditions (25 °C room temperature, still air). The DC-0506 meets fundamental requirements for ISO/IEC 17025-compliant calibration workflows and serves as a primary temperature source in applications demanding reproducible thermal boundary conditions.

Key Features

• Microprocessor-based PID controller with auto-tuning capability for adaptive thermal response and minimal overshoot.
• CFC-free single-stage compressor refrigeration system engineered for reliability, energy efficiency, and compliance with Montreal Protocol standards.
• Dual-mode circulation: independent internal bath temperature control and external closed-loop temperature field establishment via rear-mounted fluid ports.
• Heatless centrifugal circulation pump eliminates self-heating artifacts, preserving bath temperature integrity during extended operation.
• Robust 304 stainless steel inner tank and top plate; anti-aging electrostatic powder-coated steel enclosure with R-cornered edges for operator safety and durability.
• Comprehensive safety architecture including over-temperature/under-temperature alarms, low-level liquid protection, dry-run prevention for heating elements, compressor overheat and overcurrent cutoffs, and open-circuit sensor detection.
• Ergonomic design with foldable side handles and optional heavy-duty locking casters (for larger models); removable air-intake grilles for routine condenser maintenance.

Sample Compatibility & Compliance

The DC-0506 supports a broad spectrum of thermal media—including deionized water, aqueous ethylene glycol solutions, and ethanol—enabling safe operation across its full –5 °C to 100 °C range. Its 6 L working volume accommodates standard laboratory vessels up to Ø70 mm diameter or 150 mm square cross-sections, making it compatible with rotary evaporators, viscometers, spectrophotometer cuvette holders, and small-scale reaction blocks. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and incorporates design elements aligned with GLP and GMP documentation practices—including dual-setpoint display (set vs. actual), non-volatile parameter storage, and configurable alarm thresholds. While not certified to FDA 21 CFR Part 11 out-of-the-box, its analog/digital interface architecture supports integration into Part 11–compliant data acquisition systems when paired with validated third-party software and audit-trail-enabled controllers.

Software & Data Management

The DC-0506 operates via an embedded microcontroller with local front-panel interaction only; no onboard software or graphical user interface is provided. However, optional RS232/RS485 serial interfaces (Modbus RTU protocol) enable seamless integration with supervisory control systems, LIMS platforms, or custom Python/NI LabVIEW-based monitoring applications. Optional accessories include programmable multi-segment temperature ramps (1–30 steps), extended external Pt100 probes for real-time secondary loop feedback, and internal cooling coils for exothermic process mitigation. All configuration parameters—including setpoints, alarm limits, and pump enable states—are retained in non-volatile memory during power interruption, supporting continuity in regulated testing protocols.

Applications

This thermostat is routinely deployed in analytical, materials, and life science laboratories for tasks requiring high-stability thermal environments. It serves as a temperature source for viscometry (ASTM D445), refractometry (ASTM D1218), polarimetry, and atomic absorption spectroscopy sample conditioning. In materials testing, it supports controlled aging per ASTM D573 and thermal cycling of polymers and composites. In biotechnology, it stabilizes CCD detectors, laser diodes, and electrophoresis apparatuses. Its external circulation mode enables precise temperature control of jacketed reactors, condensers, and flow-cell modules used in HPLC, FTIR, and microfluidic assay development. The unit is also specified in method SOPs for QC/QA labs conducting USP thermal calibration verification and ISO 17025-accredited reference thermometer calibration.

FAQ

What temperature media are compatible with the DC-0506?
Deionized water, 30–60% aqueous ethylene glycol, and anhydrous ethanol are approved for use across the –5 °C to 100 °C range. Avoid chlorinated solvents or oils unless explicitly validated for compatibility.

Can the DC-0506 be used for external temperature control of instruments like rotary evaporators?
Yes — when equipped with the optional external Pt100 probe and configured for external temperature mode, it maintains stable setpoints in secondary loops with typical accuracy of ±0.1 °C under steady-state conditions.

Is the unit suitable for GLP-regulated environments?
Its hardware design supports GLP workflows (dual-display setpoint/actual, non-volatile settings, alarm logging via external SCADA), though full compliance requires documented validation per your site’s SOPs and IQ/OQ/PQ protocols.

What maintenance is required to sustain long-term temperature stability?
Biannual cleaning of the condenser coil through the removable front grille is recommended. Use compressed air or a soft brush; avoid liquid cleaners near electrical components.

Does the DC-0506 support programmable ramp-and-soak profiles?
Only with the optional programmable controller module (sold separately), which enables up to 30-step time-temperature sequences with real-time status display.