Coolium HX-025 Horizontal Circulating Bath Chiller (Heating-Only Mode)

Overview

The Coolium HX-025 is a precision horizontal circulating bath thermostat engineered for stable, uniform temperature control in laboratory and industrial R&D environments where active refrigeration is not required. Unlike dual-mode chillers, the HX-025 operates exclusively in heating-only mode—making it ideal for applications requiring elevated temperatures from ambient +5°C up to 95°C. Its thermodynamic architecture leverages high-efficiency resistive heating elements coupled with a low-turbulence, multi-directional internal circulation system to ensure minimal thermal stratification across the entire 25 L stainless-steel tank. The seamless, one-piece formed tank—fabricated from electropolished 316 stainless steel with rounded internal corners—eliminates weld seams and crevices that could harbor contaminants or impede heat transfer homogeneity. Temperature sensing is performed via a calibrated Pt100 RTD probe immersed directly in the working fluid, feeding real-time feedback to a PID-controlled digital regulator. This configuration delivers long-term stability of ±0.05°C and setpoint resolution to 0.01°C—meeting performance benchmarks required for ISO/IEC 17025-compliant calibration labs and GLP-regulated pharmaceutical process development.

Key Features

• Horizontal footprint design optimized for benchtop integration and space-constrained laboratories
• One-piece seamless 316 stainless-steel tank with 200 mm depth and 300 × 300 mm accessible top port for simultaneous multi-sample immersion
• Dual-mode operation: direct sample immersion within the bath or closed-loop external circulation (5–10 L/min at 0.25 bar pressure)
• Integrated circulation pump with adjustable flow rate and non-cavitation impeller geometry for low-noise, pulse-free delivery
• Digital controller with intuitive membrane keypad, real-time temperature graphing, and programmable ramp-soak profiles
• Optional auxiliary cooling interface: provision for external tap-water cooling coil or add-on immersion chiller (e.g., Coolium IC-100 series) to extend operational envelope below ambient
• Compliance-ready architecture: supports audit trails, user access levels, and event logging compatible with FDA 21 CFR Part 11 requirements when paired with Coolium LabLink software

Sample Compatibility & Compliance

The HX-025 accommodates diverse sample configurations—including glassware (e.g., viscometer spindles, cuvettes, reaction flasks), metal fixtures, and sensor probes—via its wide 300 × 300 mm top access opening and 200 mm liquid depth. Its non-corrosive tank surface and absence of internal welds facilitate cleaning validation per ASTM E3081 and USP . The unit conforms to IEC 61010-1:2010 safety standards for electrical equipment used in laboratory environments. When deployed in regulated quality control workflows (e.g., viscosity measurement per ASTM D445 or thermal stability testing per ISO 2947), the HX-025’s documented temperature uniformity (±0.03°C across central 80% volume, verified per ISO 17025 clause 6.4.3) ensures metrological traceability. Optional NIST-traceable calibration certificate available upon request.

Software & Data Management

Coolium LabLink v3.2 (Windows-based) enables remote monitoring, data export (CSV/TXT), and automated report generation. The software logs timestamped temperature readings at user-defined intervals (1 s to 60 min), records system events (e.g., power cycle, setpoint change, alarm trigger), and enforces role-based access control. Audit trail functionality satisfies ALCOA+ principles—ensuring data Attributable, Legible, Contemporaneous, Original, Accurate, and Complete. All logs are digitally signed and tamper-evident. Integration with LIMS platforms is supported via OPC UA and Modbus TCP protocols.

Applications

• Viscosity calibration and measurement using rotational or capillary viscometers (dedicated port accommodates Ubbelohde, Cannon-Fenske, and Brookfield fixtures)
• Thermal stability assessment of polymers, proteins, and pharmaceutical formulations
• Calibration of temperature-sensitive sensors (RTDs, thermistors, infrared pyrometers)
• Controlled-rate heating in enzymatic assays, cell culture incubation support, and dissolution testing
• Material testing per ASTM D696 (coefficient of linear expansion) and ISO 11357 (DSC sample pre-conditioning)
• QC/QA workflows in biotech, cosmetics, food science, and fine chemical synthesis

FAQ

Does the HX-025 include built-in refrigeration capability?

No—the HX-025 is a heating-only circulating bath. It achieves temperatures from ambient +5°C to 95°C using resistive heating only. For sub-ambient operation, an external cooling coil or optional immersion chiller must be added.
Can the HX-025 maintain temperature uniformity during extended 72-hour runs?

Yes—validated continuous operation demonstrates ±0.045°C stability over 72 hours at 60°C, with no drift exceeding ±0.01°C/hour under constant load conditions.
Is the circulation pump compatible with organic solvents such as ethanol or acetone?

The standard pump seals are EPDM-rated and suitable for aqueous solutions and mild organics. For aggressive solvents (e.g., chlorinated hydrocarbons), Viton-seal upgrade kits and PTFE-lined tubing are available as accessories.
How is temperature calibration verified and documented?

Each unit ships with factory calibration against a Fluke 1523 reference thermometer. On-site recalibration services—including uncertainty budgeting per GUM (JCGM 100:2008)—are offered annually by Coolium-certified engineers.
What safety protections are integrated into the system?

Dual independent thermal cutoffs (mechanical and electronic), dry-run protection, ground-fault circuit interruption (GFCI), and overcurrent limiting per IEC 61000-4-5 surge immunity standards.