DRETOP LQC-600 Circulating Chiller

Overview

The DRETOP LQC-600 Circulating Chiller is an integrated, water-cooled temperature control system engineered for precision thermal management in analytical instrumentation and small-scale process equipment. It operates on a closed-loop vapor-compression refrigeration cycle—utilizing R134a or R410a refrigerant (model-dependent)—to absorb heat from external devices via circulating coolant (typically deionized water or 30–50% ethylene glycol/water mixture), then reject that heat through a water-cooled condenser. Unlike air-cooled chillers, the LQC-600 minimizes ambient thermal interference and maintains consistent cooling capacity across variable room temperatures, making it especially suitable for laboratories where HVAC stability is limited or where multiple heat-sensitive instruments—such as HPLC systems, rotary evaporators, spectrophotometers, and electrophoresis units—require simultaneous, independent temperature regulation. Its 0–99.9 °C operational range supports both sub-ambient cooling and high-temperature recirculation applications, enabling versatility beyond conventional “cold-only” chillers.

Key Features

• Precision Temperature Control: Equipped with a high-stability Pt100 RTD sensor and adaptive PID control algorithm, the LQC-600 achieves typical temperature stability within ±0.2 °C (load-dependent); setpoint resolution is 0.1 °C.
• Robust Enclosure & Fluid Integrity: Powder-coated steel chassis provides corrosion resistance; stainless-steel reservoir and passivated internal tubing prevent oxidation and microbial growth—critical for long-term use with ultrapure water or buffer solutions.
• Sealed Refrigeration Loop: Hermetically sealed compressor and fully enclosed coolant path eliminate exposure to dust, humidity, and atmospheric oxygen—reducing maintenance frequency and extending fluid service life.
• Energy-Efficient Operation: Inverter-driven scroll compressor modulates output based on real-time thermal load; combined with microchannel aluminum fin-and-tube heat exchangers, this architecture improves coefficient of performance (COP) by up to 22% versus fixed-speed equivalents.
• Continuous Duty Rating: Rated for 24/7 operation under full-load conditions; validated via 72-hour factory burn-in testing at maximum refrigeration capacity and extreme ambient temperatures (up to 40 °C).
• Integrated Safety Protections: Dual-stage overtemperature cutoff, low-flow detection, dry-run prevention, compressor overcurrent monitoring, and reservoir level sensing ensure fail-safe operation during unattended runs.

Sample Compatibility & Compliance

The LQC-600 interfaces with standard 1/4″–3/8″ compression or quick-connect fittings (KF-compatible adapters available). It is compatible with all major laboratory instruments requiring external coolant circulation—including Shimadzu, Waters, Agilent, and Thermo Fisher analytical platforms—as well as custom jacketed reactors and vacuum distillation setups. While not certified to UL 61010-1 or IEC 61000-6-4 out-of-the-box, its electrical architecture adheres to fundamental safety principles aligned with EN 61000-6-2 (immunity) and EN 61000-6-3 (emissions). For regulated environments, the unit supports audit-ready documentation when paired with optional RS485/Modbus RTU communication modules—enabling integration into FDA 21 CFR Part 11–compliant data acquisition systems with electronic signature and change-tracking capabilities.

Software & Data Management

The LQC-600 features a backlit LCD interface displaying real-time outlet temperature, pump status, error codes (e.g., E03 = low flow, E07 = high discharge pressure), and runtime hours. Optional RS485 Modbus RTU connectivity allows bidirectional communication with SCADA, LabVIEW, or custom PLC-based supervisory systems. Supported registers include temperature setpoint (40001), actual outlet temperature (30001), pump speed % (40002), and fault status bitmask (30002). All parameter changes are timestamped and logged locally (non-volatile memory), supporting retrospective review per GLP Annex 11 requirements. No proprietary software installation is required—configuration is performed via standard Modbus polling tools or vendor-supplied terminal emulator.

Applications

• HPLC column oven and detector cooling in QC/QA labs
• Temperature stabilization of rotary evaporator condensers (≤50 °C bath)
• Cooling of laser sources, CCD detectors, and X-ray generators
• Thermal conditioning of electrophoresis power supplies and gel tanks
• Heat removal from small-scale catalytic reactors (≤5 L volume)
• Support for FTIR, Raman, and UV-Vis spectrometers requiring vibration-isolated, low-noise cooling

FAQ

What coolant fluids are compatible with the LQC-600?
Deionized water is recommended for temperatures above 5 °C. For sub-zero operation or extended outdoor use, a 30–50% ethylene glycol/water mixture is advised. Propylene glycol may be substituted where food-grade compatibility is required.

Can the LQC-600 be used for heating-only applications?
No—it is a refrigeration-based chiller without electric heating elements. However, its wide 0–99.9 °C range enables precise recirculation of pre-heated fluid when used downstream of an external heater.

Is the pump flow rate adjustable?
Yes—flow is continuously variable from 0 to 30 L/min via front-panel control or Modbus register 40002; pressure output ranges from 0 to 1.0 bar (gauge), sufficient for most benchtop instrumentation.

Does the unit require external water supply for condenser cooling?
Yes—the LQC-600 is water-cooled; it requires connection to a facility water line or closed-loop tower system with inlet water temperature ≤32 °C and flow ≥2.5 L/min to maintain rated refrigeration capacity.

What is the expected service interval for routine maintenance?
Under normal laboratory conditions, annual inspection of coolant quality, condenser cleanliness, and electrical connections is recommended. Compressor oil and refrigerant do not require periodic replacement unless leakage or performance degradation is observed.