Techne FC-500 Flow-through Chiller

Overview

The Techne FC-500 Flow-through Chiller is an engineered thermal management solution designed to extend the operational temperature range of Techne liquid circulating baths—enabling stable, continuous cooling down to –35°C under controlled ambient conditions. Unlike immersion-style chillers or standalone refrigerated circulators, the FC-500 operates as a dedicated external heat extraction unit: it draws bath fluid via integrated pump-driven circulation, passes it through a high-efficiency vapor-compression refrigeration system, removes thermal load, and returns temperature-stabilized fluid to the main bath reservoir. This closed-loop flow-through architecture ensures minimal thermal lag, consistent heat transfer coefficients, and precise control over coolant temperature gradients—critical for applications demanding reproducible low-temperature environments in analytical instrumentation, material testing, and reaction calorimetry.

Key Features

• Stable operation down to –35°C using a validated 40:40:20 (water:antifreeze:ethanol) coolant mixture—optimized for viscosity, freezing point depression, and thermal conductivity.
• Dual-stage refrigeration system with hermetically sealed compressor and copper-aluminum microchannel evaporator for high reliability and reduced maintenance intervals.
• Integrated flow sensor and pressure monitoring circuitry to prevent dry-run conditions and ensure minimum flow rate compliance during extended operation.
• Front-panel digital display with real-time readout of outlet temperature, setpoint deviation, and system status indicators (e.g., refrigerant pressure alarm, low-flow warning).
• Modular mounting interface compatible with Techne TC-series circulating baths—including standardized quick-connect fluid ports and mechanical alignment guides for vibration-damped installation.
• Passive thermal insulation layer around internal reservoir and refrigerant lines minimizes parasitic heat ingress, improving energy efficiency at sub-zero operating points.

Sample Compatibility & Compliance

The FC-500 is intended exclusively for use with Techne-certified liquid circulating baths and requires compatibility verification with the host bath’s maximum flow rate (≤8 L/min), minimum inlet pressure (≥0.2 bar), and allowable coolant chemistry. It supports only non-corrosive, low-conductivity heat transfer fluids meeting ISO 6743-20 Class HEPR specifications. The unit complies with IEC 61000-6-3 (EMC emissions), IEC 61000-6-2 (immunity), and carries UKCA marking for conformity with UK Supply of Machinery Regulations 2008. While not classified as medical or pharmaceutical-grade equipment, its thermal stability profile supports GLP-aligned workflows where temperature traceability and repeatability are documented per SOPs referencing ISO/IEC 17025 calibration practices.

Software & Data Management

The FC-500 operates as a standalone analog-controlled chiller without native digital communication interfaces (e.g., RS-232, USB, or Ethernet). Temperature setpoints and operational status are managed locally via front-panel controls. For integration into automated laboratory systems, optional third-party analog I/O modules (0–10 V or 4–20 mA) may be used to monitor outlet temperature and trigger external logic controllers. All thermal performance data—including runtime hours, cumulative compressor cycles, and fault logs—are retained in non-volatile memory and accessible via diagnostic mode (service code required). No FDA 21 CFR Part 11-compliant audit trail functionality is embedded; users requiring electronic record integrity must implement external logging solutions compliant with ALCOA+ principles.

Applications

• Extending the low-temperature capability of Techne TC-series baths for polymer crystallization studies requiring isothermal holds below –25°C.
• Providing auxiliary cooling for UV-Vis spectrophotometer sample compartments, NMR probe pre-cooling circuits, and FTIR interferometer thermal stabilization.
• Supporting low-temperature reaction kinetics in jacketed glass reactors coupled to Techne bath systems.
• Enabling cryogenic calibration of thermocouples, RTDs, and infrared pyrometers across –35°C to +25°C ranges under controlled ramp rates.
• Facilitating long-duration stability testing of battery electrolytes and phase-change materials where sustained sub-zero thermal sink capacity is critical.

FAQ

What coolant mixture is required to achieve –35°C?
A precisely formulated blend of 40% deionized water, 40% propylene glycol-based antifreeze, and 20% anhydrous ethanol is mandatory. Substitution with methanol, ethylene glycol, or non-standard ratios will impair heat transfer efficiency and risk system freeze-up.
Can the FC-500 operate independently without a Techne bath?
No. It lacks an internal pump for primary circulation and is not rated for open-loop or direct immersion use. It must be plumbed in series with a compatible Techne circulating bath.
Is the internal reservoir user-serviceable?
The 200 mL reservoir is sealed and not intended for field refilling or cleaning. Coolant replacement must follow Techne Service Bulletin SB-FC500-REV3, including vacuum-assisted purge and refrigerant charge verification.
Does the FC-500 support remote start/stop via digital signal?
Not natively. External relay control is possible using the dry-contact terminals provided on the rear panel, but no programmable logic or protocol-level command support is included.
What is the expected service life under continuous –30°C operation?
Based on accelerated life testing per BS EN 60068-2-14, mean time between failures exceeds 12,000 hours when operated within specified ambient (15–25°C), humidity (<65% RH non-condensing), and voltage tolerance (220–240 V AC ±5%).