Hengping DC-0515TD Low-Temperature Constant-Temperature Bath Circulator

Overview

The Hengping DC-0515TD Low-Temperature Constant-Temperature Bath Circulator is an engineered thermal management system designed for precise temperature control in laboratory and industrial R&D environments. Utilizing a closed-loop, air-cooled single-stage compression refrigeration cycle combined with resistive heating, the unit maintains stable thermal conditions across a broad operational range of −5 °C to +60 °C. Its core function is to serve as a reliable, externally accessible heat transfer medium—whether water, silicone oil, or other compatible fluids—for sample conditioning, instrument calibration, material property testing, or as a secondary thermal source for analytical equipment requiring stable thermal input (e.g., viscometers, spectrophotometers, or chromatography detectors). The bath’s stainless-steel construction ensures chemical resistance, mechanical durability, and long-term corrosion resilience under repeated thermal cycling and solvent exposure.

Key Features

• Full stainless-steel tank and housing—resistant to aqueous, organic, and mildly acidic/alkaline media; compliant with ISO 9001-certified manufacturing practices.
• PID-regulated microprocessor temperature controller with 0.1 °C display resolution and ±0.05 °C stability over time—enabling high reproducibility in temperature-sensitive protocols.
• Integrated dual-mode circulation pump delivering up to 8 L/min flow rate, supporting both internal recirculation and external closed-loop applications via adjustable outlet valves.
• Air-cooled single-stage compressor system—eliminates need for chilled water infrastructure while maintaining low acoustic emissions (<55 dB(A) at 1 m) and consistent cooling performance even under ambient temperatures up to 32 °C.
• Intuitive backlit LCD interface with real-time setpoint/actual temperature readout, programmable ramp-soak profiles, and hardware-based over-temperature protection (cut-off at +65 °C).

Sample Compatibility & Compliance

The DC-0515TD accommodates standard laboratory fluids including deionized water, ethylene glycol/water mixtures, and silicone oils (viscosity ≤ 500 cSt), making it suitable for applications ranging from cryogenic sample storage support to elevated-temperature reaction monitoring. Its design conforms to IEC 61010-1:2010 safety requirements for electrical equipment used in measurement, control, and laboratory use. While not intrinsically rated for hazardous locations, the unit meets CE marking criteria for EMC and low-voltage directive compliance. For regulated environments (e.g., GLP/GMP labs), optional audit-trail-capable firmware upgrades may be integrated with third-party LIMS platforms to satisfy FDA 21 CFR Part 11 data integrity requirements.

Software & Data Management

The DC-0515TD operates autonomously via its embedded controller but supports RS-232 serial communication for remote monitoring and parameter adjustment using host PC software (Windows-compatible, provided separately). Logged temperature data—including setpoint deviations, runtime hours, and compressor duty cycles—can be exported in CSV format for traceability. When deployed in multi-instrument thermal networks, the bath can be synchronized with external controllers via analog 0–5 V or 4–20 mA signals, enabling coordinated temperature staging in multi-zone experimental setups.

Applications

• Calibration of thermistors, RTDs, and infrared thermometers against NIST-traceable references.
• Thermal conditioning of polymer samples prior to tensile, DSC, or DMA analysis per ASTM D638, ISO 11357, and ASTM D7028 standards.
• Stabilization of optical components in spectroscopy and interferometry systems where thermal drift compromises resolution.
• Supporting controlled-rate crystallization studies in pharmaceutical development (ICH Q5C, USP <1031>).
• Providing auxiliary cooling/heating for rotary evaporators, condensers, or jacketed reactors in pilot-scale synthesis.

FAQ

What fluid types are compatible with the DC-0515TD bath?

Deionized water, 30–50% ethylene glycol/water solutions, and low-viscosity silicone oils (≤500 cSt) are recommended. Avoid halogenated solvents, strong oxidizers, or fluids with flash points below −10 °C.
Can the unit maintain temperature stability during external load fluctuations?

Yes—the PID algorithm dynamically adjusts compressor duty cycle and heater output to compensate for heat exchange variations caused by immersion probes, tubing losses, or flow rate changes in external loops.
Is external temperature logging supported out of the box?

The built-in controller logs internal sensor data; real-time external logging requires connection via RS-232 and use of supplied terminal software or custom SCADA integration.
Does the bath include over-temperature and dry-run protection?

Yes—hardware-based thermal cutoff activates at +65 °C, and pump stall detection disables circulation if flow falls below 1.5 L/min for >30 seconds.
What maintenance intervals are recommended for long-term reliability?

Compressor oil and refrigerant levels should be verified annually; condenser coils require bi-monthly dust removal; stainless-steel tank cleaning with mild citric acid solution is advised every 6 months for water-based operation.