DRETOP LX4-20-350 Circulating Chiller

Overview

The DRETOP LX4-20-350 is a compact, air-cooled circulating chiller engineered for precise thermal management in laboratory-scale applications requiring stable, continuous cooling between −20 °C and +40 °C. It operates on the vapor-compression refrigeration cycle, utilizing an environmentally responsible refrigerant with zero ozone depletion potential (ODP) and low global warming potential (GWP), fully compliant with international environmental directives including EU F-Gas Regulation (EU No. 517/2014) and EPA SNAP program requirements. Designed for integration with analytical instruments—such as spectrophotometers, laser systems, rotary evaporators, and material testing rigs—the unit delivers consistent heat extraction via a closed-loop circulation system. Its 4 L reservoir and 20 L/min flow rate support moderate thermal loads while maintaining minimal footprint (200 × 430 × 450 mm), enabling benchtop or fume hood installation without external ventilation ducting. The chiller employs regenerative temperature differential control logic to optimize compressor duty cycle and reduce energy consumption during partial-load operation—a feature critical for labs operating under ISO 50001 energy management frameworks.

Key Features

• Adaptive refrigeration control algorithm that dynamically adjusts compressor output based on real-time thermal load and ambient conditions, improving energy efficiency by up to 25% compared to fixed-speed equivalents.
• NTC-based high-stability temperature sensor with single-point calibration capability, traceable to NIST-certified reference standards; optional factory calibration certificate available upon request.
• Brushless, maintenance-free circulation pump with automatic pressure and flow compensation—self-adjusting to variable backpressure from external equipment without risk of cavitation or mechanical stress.
• Full-spectrum safety architecture: dual-stage reservoir temperature monitoring, condenser overtemperature cutoff, compressor thermal overload protection, low-level fluid alarm (via optical + mechanical dual-sensing glass level gauge), and dry-run prevention.
• Corrosion-resistant wetted path: 316 stainless steel reservoir and cooling coil, EPDM-sealed fittings, PTFE-lined sensor housing, and fluoropolymer-reinforced tubing ensure compatibility with water, 30% ethylene glycol/water mixtures, and other common heat transfer fluids per ASTM D1384 and ISO 8502-9 specifications.
• RS485 serial interface supporting Modbus RTU protocol for integration into centralized lab infrastructure monitoring systems (e.g., LabVantage, Thermo Fisher SampleManager, or custom SCADA environments).

Sample Compatibility & Compliance

The LX4-20-350 is validated for use with standard aqueous and glycol-based heat transfer media. All fluid-contact materials meet USP Class VI biocompatibility requirements and comply with FDA 21 CFR Part 11 when paired with audit-trail-enabled control software (available as optional firmware upgrade). The unit conforms to IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and EMC Directive 2014/30/EU. Its construction supports GLP and GMP-aligned workflows through configurable alarm logging, user-accessible error code diagnostics (e.g., E01 = low coolant level, E07 = high discharge temperature), and password-protected parameter modification.

Software & Data Management

While the base model features a local LCD interface with manual setpoint adjustment and status display, optional firmware enables remote configuration and real-time telemetry via RS485. Logged data—including setpoint history, actual bath temperature, pump runtime, and fault events—is exportable in CSV format for trend analysis in Excel or LIMS integration. Audit trail functionality (optional) records operator ID, timestamp, and parameter change details—fully satisfying ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) required under FDA 21 CFR Part 11 and EU Annex 11.

Applications

• Temperature stabilization of UV-Vis and FTIR spectrometers during extended acquisition sequences.
• Cooling of high-power diode lasers and optical parametric oscillators (OPOs) in photonics research.
• Thermal regulation of reaction blocks in parallel synthesis systems and automated calorimeters.
• Supporting controlled-rate freezing protocols in cryobiology sample preparation stations.
• Providing auxiliary cooling for HPLC column ovens and mass spectrometer ion sources where ambient air cooling proves insufficient.
• Process validation support in pharmaceutical pilot plants meeting ICH Q5C stability testing guidelines (25 °C/60% RH, 40 °C/75% RH, and accelerated conditions).

FAQ

What is the minimum allowable coolant concentration for glycol mixtures?
The system is rated for up to 30% v/v ethylene or propylene glycol in deionized water. Higher concentrations may impair heat transfer efficiency and increase viscosity beyond pump design limits.
Can the chiller maintain ±0.1 °C stability?
Yes—when configured with the optional E-series precision control module (part number LX4-20-350-E), which includes enhanced PID tuning, higher-resolution temperature feedback, and reduced hysteresis logic.
Is remote shutdown capability supported?
Yes—via RS485 command (Modbus function code 06) or hardwired dry-contact input (accessory terminal block kit required).
Does the unit include a drain valve for maintenance?
Yes—a front-mounted brass drain valve with quick-release fitting enables full reservoir evacuation without disassembly.
What is the expected service life of the compressor under continuous operation?
Rated for ≥30,000 hours MTBF (mean time between failures) when operated within ambient temperature range 10–35 °C and relative humidity ≤80% non-condensing, per manufacturer’s accelerated life testing per ISO 16148.