Coolium HX-2012 Precision Refrigerated Circulating Water Bath

Overview

The Coolium HX-2012 Precision Refrigerated Circulating Water Bath is an integrated temperature control system engineered for laboratory environments requiring stable, bidirectional thermal regulation across a wide operational range (−20 °C to +95 °C). Unlike passive water baths, the HX-2012 incorporates a hermetically sealed refrigeration compressor, high-efficiency immersion heater, and a magnetically coupled circulation pump—enabling precise, closed-loop temperature maintenance without reliance on external chillers or tap-water cooling. Its design follows the principles of forced-convection thermal equilibrium, where recirculated fluid ensures uniform heat transfer to immersed samples or externally connected instrumentation. The unit functions both as a standalone bath for in-situ experiments (e.g., enzyme kinetics, dissolution testing, or sample equilibration) and as a remote temperature source for peripheral devices including viscometers, electrophoresis systems, rotary evaporators, molecular pumps, and microwave ablation platforms.

Key Features

• Integrated refrigeration and heating architecture with independent PID control loops for rapid thermal response and minimal overshoot
• Dual-resolution digital display (0.1 °C or 0.01 °C), configurable via front-panel interface
• Stainless steel 304 bath chamber with 200 mm depth and 170 mm × 170 mm access opening—optimized for ease of sample handling and probe insertion
• Robust circulation system delivering 5–10 L/min flow at 0.25 bar pressure, supporting long-line external loops up to 15 m total length
• Comprehensive safety suite: real-time monitoring for dry-run, over-temperature, low-fluid level, and electrical fault conditions with audible/visual alerts
• Modular expansion capability: optional RS485 interface enables integration into centralized lab automation networks (Modbus RTU protocol)
• Auto-refill module (optional) maintains consistent bath volume during extended unattended operation—critical for GLP-compliant stability studies

Sample Compatibility & Compliance

The HX-2012 accommodates standard laboratory glassware (up to Ø150 mm diameter), immersion probes, and jacketed reactors. Its non-corrosive bath interior and chemically inert silicone circulation tubing ensure compatibility with aqueous buffers, ethanol/water mixtures, and low-viscosity silicone oils (up to 50 cSt). The system meets CE marking requirements per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD). While not certified to ISO/IEC 17025, its ±0.1 °C temperature stability supports method validation under ISO 17025-accredited laboratories when used with traceable NIST-calibrated reference thermometers. For pharmaceutical applications, the unit’s programmable ramp-soak profiles and audit-ready event logging (when paired with RS485-enabled SCADA software) align with FDA 21 CFR Part 11 data integrity expectations for electronic records.

Software & Data Management

The HX-2012 operates autonomously via its embedded microcontroller but supports external supervision through optional RS485 serial communication. When interfaced with compliant host software (e.g., LabVIEW, MATLAB, or custom Python-based DAQ systems), users can remotely configure setpoints, monitor real-time bath temperature and circulation status, log timestamped thermal profiles, and trigger alarms via Modbus register mapping. All local events—including power cycles, safety interlock activations, and manual parameter changes—are stored in non-volatile memory for ≥30 days. No proprietary cloud platform or vendor-hosted service is required; data export is native CSV format, facilitating integration into LIMS or ELN environments without third-party dependencies.

Applications

• Temperature-controlled enzymatic assays and protein denaturation studies requiring sub-0.2 °C stability over 24+ hours
• Calibration of temperature-sensitive analytical instruments (e.g., viscometers, densitometers, refractometers)
• Thermal preconditioning of polymer samples prior to DSC or rheological analysis
• Cooling support for high-power electrophoresis rigs and laser-based optical systems generating >100 W waste heat
• Stabilization of vacuum pump oil in molecular distillation setups operating below −10 °C
• Continuous-flow chemistry reactors with external jacketed temperature control

FAQ

What is the maximum allowable ambient temperature for continuous operation?
The HX-2012 is rated for continuous duty at ambient temperatures ≤30 °C and relative humidity ≤80% non-condensing. Above 30 °C, refrigeration capacity declines linearly; operation above 35 °C is not recommended.
Can the unit maintain −20 °C with a full 12 L load of water?
Yes—tested performance confirms stable −20 °C operation using deionized water, provided ambient conditions are within specification and the bath cover is installed.
Is the circulation pump compatible with organic solvents such as acetone or chloroform?
No. The standard pump seals and tubing are rated for aqueous and polar solvent use only. For aggressive organics, consult Coolium’s chemical compatibility guide and specify fluorinated elastomer (FKM) wetted parts as a custom order.
Does the system support programmable temperature ramps?
Yes—via RS485 command set. Local front-panel programming supports single-step setpoint hold only; multi-segment ramp-soak profiles require external controller integration.
What calibration documentation is supplied?
Each unit ships with a factory-verified temperature uniformity report (measured at 5 points in the bath at 25 °C and −20 °C) and electrical safety test certificate. NIST-traceable calibration certificates are available as a paid add-on service.