LT-100-80 Ultra-Low Temperature Circulating Chiller

Overview

The LT-100-80 Ultra-Low Temperature Circulating Chiller is an engineered thermal management system designed for precise, stable, and continuous cooling in demanding laboratory and pilot-scale industrial applications. It operates on a dual-stage cascade refrigeration principle—utilizing R404A in the high-stage and R23 in the low-stage—to achieve sustained output temperatures as low as −80 °C. Unlike single-stage chillers limited by thermodynamic constraints, this cascade architecture enables reliable operation across a wide working range (−80 °C to −40 °C) while maintaining ±2 °C temperature stability under dynamic load conditions. Its closed-loop circulation design minimizes evaporation loss and moisture ingress, preserving the chemical integrity and thermal performance of heat transfer fluids such as silicone oil or specialized low-temperature glycol blends. The chiller is intended for integration with external equipment—including jacketed reactors, calorimeters, cryogenic material testers, and environmental simulation chambers—where reproducible sub-zero thermal control is critical to process fidelity and data validity.

Key Features

• Two-stage cascade refrigeration system with R404A/R23 refrigerant pairing for extended low-temperature capability down to −80 °C
• Hermetically sealed stainless steel (SUS304) reservoir and fluid path to prevent oxidation, moisture absorption, and contamination
• Comprehensive electrical and mechanical protection suite: compressor delay start, high-pressure cut-off, phase sequence monitoring, thermal overload relay, overcurrent interruption, and automatic liquid overflow drainage
• High-capacity circulation pump delivering up to 30 L/min at 1 bar maximum pressure, compatible with long-line or multi-point distribution systems
• Digital temperature controller with Pt100 sensor input, offering real-time monitoring, setpoint programming, and deviation alarms
• Robust industrial-grade construction: reinforced steel frame, vibration-damped mounting, and IP54-rated electrical enclosure for lab and controlled manufacturing environments

Sample Compatibility & Compliance

The LT-100-80 is compatible with non-corrosive, low-volatility heat transfer media including synthetic hydrocarbon oils, silicone-based fluids, and custom-formulated low-temperature glycols. It is not intended for direct contact with water or aqueous solutions below 0 °C due to freezing risk. All wetted parts are constructed from SUS304 stainless steel, ensuring compatibility with common organic solvents and mild acids encountered in pharmaceutical synthesis and polymer processing. While not certified to specific ISO or ASTM standards out-of-the-box, the system’s architecture supports integration into GLP- and GMP-compliant workflows when paired with validated SOPs, calibration records, and audit-trail-capable external controllers. Its electrical safety design complies with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emission) requirements for industrial equipment.

Software & Data Management

The LT-100-80 features a local digital interface with password-protected parameter access, real-time temperature logging (internal buffer), and configurable alarm thresholds. For traceable operation in regulated environments, it supports analog 4–20 mA and RS485 Modbus RTU outputs—enabling seamless integration with SCADA systems, LIMS platforms, or programmable logic controllers (PLCs). When connected to compliant supervisory software, the chiller can generate time-stamped operational logs including setpoint history, actual temperature profiles, fault codes, and power consumption trends—meeting foundational requirements for FDA 21 CFR Part 11 electronic record retention when deployed with appropriate system validation and user access controls.

Applications

• Temperature control of jacketed glass or stainless steel reactors during exothermic synthesis, crystallization, or hydrogenation at −40 °C to −80 °C
• Cryogenic testing of polymers, composites, and battery electrolytes under controlled thermal cycling protocols
• Stabilization of analytical instruments requiring sub-ambient detector or sample chamber cooling (e.g., FTIR accessories, XRD stages)
• Process simulation for freeze-drying cycle development, low-temperature distillation, or supercritical fluid extraction
• Supporting QC/QA labs in pharmaceutical and biotech facilities where temperature consistency directly impacts assay reproducibility and regulatory submission data integrity

FAQ

What is the minimum achievable temperature at full load?
The LT-100-80 maintains −80 °C output under nominal ambient conditions (25 °C, ≤70% RH) with a 24 L fluid charge and no external thermal leakage. Actual performance depends on insulation quality of connected equipment and ambient heat load.

Can this chiller be used with water-glycol mixtures?
Yes—provided the mixture is formulated for operation below −80 °C and contains corrosion inhibitors compatible with SUS304. Standard 30/70 ethylene glycol/water freezes at ~−35 °C and is unsuitable; low-temperature specialty formulations must be selected.

Is remote monitoring supported natively?
The unit includes RS485 Modbus RTU and 4–20 mA analog outputs. Native Ethernet or Wi-Fi connectivity requires external gateway hardware and third-party SCADA integration.

How often does the refrigerant require servicing?
Under normal operation and proper installation (vibration isolation, adequate ventilation), the sealed cascade system requires no routine refrigerant recharge. Leak detection and pressure verification should be performed annually as part of preventive maintenance.

Does the system meet CE or UL certification requirements?
The LT-100-80 meets IEC electrical safety and EMC standards applicable to industrial equipment. CE marking is contingent upon final configuration, installation environment, and regional conformity assessment—consult local regulatory guidance for deployment in EU or North American markets.