Langbo HX-1030 Low-Temperature Constant-Temperature Bath

Overview

The Langbo HX-1030 Low-Temperature Constant-Temperature Bath is a precision thermal management system engineered for laboratory-scale temperature control in analytical, physical property, and process validation applications. Operating on the principle of forced convection via a closed-loop refrigeration cycle coupled with a high-flow stainless steel circulation pump, the HX-1030 maintains stable thermal environments across a wide operating range from −10 °C to +100 °C. Its thermally insulated stainless steel bath chamber—measuring 400 × 325 × 230 mm with a nominal 30 L working volume—supports both direct immersion experiments and external temperature coupling via dual-mode fluid circulation. The unit employs a hermetically sealed compressor-based cooling system, complemented by a microprocessor-driven PID controller that continuously monitors and adjusts heater output and refrigerant expansion valve timing to achieve ±0.05 °C temperature stability under standard ambient conditions (25 °C, 1 atm). This level of thermal reproducibility meets baseline requirements for ASTM E2265 (Standard Practice for Calibration of Liquid-in-Glass Thermometers), ISO/IEC 17025-compliant calibration workflows, and routine QC testing in pharmaceutical, polymer, and material science laboratories.

Key Features

• Full stainless steel construction—including interior tank, lid, and work surface—for corrosion resistance, cleanability, and long-term dimensional stability in aggressive chemical environments.
• Dual-circulation architecture: internal recirculation ensures uniform temperature distribution within the bath chamber; external circulation (15 L/min max flow) enables precise thermal coupling with external devices such as spectrophotometer cells, viscometers, or reaction calorimeters.
• Digitally tuned PID control algorithm with real-time deviation compensation, adjustable integral and derivative gain parameters, and auto-tuning capability for optimized response across varying load conditions.
• Integrated safety system featuring dual-stage compressor protection—thermal cut-off switch and electronic overcurrent monitoring—ensuring operational integrity during extended unattended runs.
• Large open-top configuration (310 × 280 mm) facilitating easy access for sample insertion, probe placement, or integration with custom fixtures and multi-vessel racks.
• Modular accuracy upgrade path: factory-calibrated sensor and firmware options available for ±0.01 °C and ±0.001 °C stability specifications—validated per ISO 17025 traceable procedures and suitable for GLP/GMP-regulated environments requiring documented thermal uncertainty budgets.

Sample Compatibility & Compliance

The HX-1030 accommodates a broad spectrum of sample formats—including glass and metal immersion vessels, jacketed reactors up to 5 L volume, optical cuvettes, and capillary rheometry cells—without compromising thermal homogeneity. Its non-reactive stainless steel bath surface and chemically inert silicone-based circulation tubing minimize leaching risks when used with aqueous, ethylene glycol/water, or low-viscosity organic coolant mixtures (e.g., ethanol/methanol blends). The system complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and incorporates CE-marked components meeting EMC Directive 2014/30/EU. While not certified for Class I Division 1 hazardous locations, its sealed refrigerant circuit and grounded chassis support safe operation in ISO Class 7 (10,000) cleanrooms and general-purpose analytical labs adhering to USP Analytical Instrument Qualification guidelines.

Software & Data Management

The HX-1030 operates as a standalone instrument with front-panel LCD interface and tactile keypad navigation. For automated data capture and audit-ready documentation, optional RS485/Modbus RTU or USB-to-serial interface modules enable integration with LabVIEW, MATLAB, or custom SCADA platforms. When paired with Langbo’s optional LogMaster™ software suite (v3.2+), users can configure time-scheduled temperature ramps, export timestamped CSV logs with ±0.001 °C resolution, and generate PDF reports compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, user access controls, and immutable audit trails for all setpoint changes and alarm events.

Applications

• Calibration of thermistors, RTDs, and liquid-in-glass thermometers against NIST-traceable reference standards.
• Viscosity measurements using rotational or capillary viscometers requiring stable thermal input at defined shear rates.
• Accelerated stability testing of pharmaceutical formulations per ICH Q1A(R2) guidelines (e.g., 40 °C/75% RH conditioning support).
• Controlled-cooling studies in polymer crystallization kinetics and phase transition analysis (DSC sample prep).
• Thermal equilibration of optical components prior to interferometric or spectroscopic characterization.
• Supporting ASTM D2570 (Cold Cranking Simulator), ASTM D445 (Kinematic Viscosity), and ISO 3104 test methods through precise bath temperature maintenance.

FAQ

What is the minimum achievable temperature with the HX-1030, and does ambient humidity affect performance?

The unit achieves −10 °C under standard test conditions (25 °C ambient, 50% RH, no external heat load). Humidity above 70% RH may reduce cooling efficiency due to condensation on evaporator coils; installation in climate-controlled rooms is recommended for repeatable sub-zero operation.
Can the HX-1030 maintain temperature stability during continuous external circulation?

Yes—the 15 L/min pump and oversized condenser ensure ±0.05 °C stability even with 3 m of 10 mm-ID insulated tubing and a 2 L external vessel, provided total system thermal mass remains within 15 kg and ambient drafts are minimized.
Is third-party calibration documentation available for ISO/IEC 17025 accreditation?

Factory calibration certificates (including as-found/as-left data, uncertainty budgets, and traceability statements to NIM China) are supplied with each unit. On-site verification services and accredited calibration by CNAS-certified labs can be arranged separately.
What coolant fluids are compatible with the HX-1030’s wetted parts?

Deionized water, 30–50% ethylene glycol/water mixtures, and anhydrous ethanol are fully compatible. Avoid chlorinated solvents, strong acids/bases, and silicone oils unless validated for prolonged contact with 304 stainless steel and EPDM seals.
Does the HX-1030 support remote start/stop and setpoint adjustment via digital interface?

Yes—via Modbus RTU (addressable register map included) or ASCII command protocol over RS485. All functions—including ramp rate, hold time, and alarm thresholds—are programmable without front-panel interaction.