Tamson TLC15-5 Low-Temperature Circulating Bath

Overview

The Tamson TLC15-5 Low-Temperature Circulating Bath is a compact, microprocessor-controlled thermal management system engineered for precision temperature regulation in laboratory environments. Utilizing a closed-loop refrigeration cycle with an environmentally compliant refrigerant (free of CFCs and HCFCs), the unit delivers stable, reproducible thermal control across a wide operational range from –15 °C to +60 °C. Its design adheres to fundamental thermodynamic principles of forced convection heat transfer, enabling consistent thermal coupling between the bath fluid and external devices—such as refractometers, rotary evaporators, distillation assemblies, flash point testers, and analytical instrumentation requiring precise thermal conditioning. The 5 L stainless steel bath reservoir features an open-top configuration (85 × 150 mm aperture) optimized for immersion probes and auxiliary equipment integration, while its low-profile footprint allows flexible placement on benchtops or under-counter installations without compromising accessibility or serviceability.

Key Features

• High-stability temperature control with ±0.02 °C uniformity over the full operating range, achieved via adaptive PID algorithm with user-accessible parameter tuning
• Dual-mode thermal operation: simultaneous cooling and heating capability ensures rapid thermal equilibration and overshoot suppression
• CE-compliant construction with integrated mechanical safety thermostat and visual liquid-level float indicator for fail-safe operation
• RS232 serial interface supporting Tamcom—a free, Windows-based software package enabling real-time temperature logging, time-stamped setpoint profiling, and remote parameter configuration
• Quiet, low-vibration operation enabled by optimized pump hydraulics and vibration-dampened compressor mounting
• Energy-efficient, maintenance-free refrigeration architecture with extended service life and minimal ambient heat dissipation
• Bi-directional circulation porting (internal recirculation + external loop connection) for compatibility with jacketed reactors, condensers, and external heat exchangers

Sample Compatibility & Compliance

The TLC15-5 is designed for use with water, water-glycol mixtures, silicone oils, and other non-corrosive heat-transfer fluids compatible with stainless steel and fluoropolymer wetted materials. It meets essential European safety directives under the CE marking framework, including Machinery Directive 2006/42/EC and Electromagnetic Compatibility Directive 2014/30/EU. While not classified as a GLP/GMP-regulated instrument per se, its RS232 data logging functionality—when used with Tamcom—supports audit-ready temperature traceability suitable for ISO/IEC 17025-accredited laboratories. The device does not incorporate FDA 21 CFR Part 11-compliant electronic signature or audit trail features natively; however, third-party validated data acquisition systems may be interfaced via RS232 for regulated environments requiring ALCOA+ data integrity.

Software & Data Management

Tamcom software provides direct communication with the TLC15-5 via standard RS232 protocol (9600 baud, no parity). Users can configure ramp-hold temperature profiles, export timestamped CSV logs at user-defined intervals (1–600 seconds), and monitor real-time deviation from setpoint. The software supports multi-channel synchronization when multiple Tamson units are deployed. All configurations are stored locally on the host PC; the instrument itself retains only the active setpoint and PID values in non-volatile memory. No cloud connectivity or firmware-over-the-air updates are supported—ensuring data sovereignty and minimizing cybersecurity surface area in sensitive research or QA/QC settings.

Applications

• Thermal conditioning of optical instruments (e.g., Abbe refractometers, polarimeters) requiring sub-0.05 °C stability
• Cooling jackets for rotary evaporators operating below ambient, especially during low-boiling-point solvent removal
• Temperature stabilization of distillation columns, vapor pressure measurement cells, and flash point testers (ASTM D56, D93, ISO 2719)
• Calibration baths for thermistor, RTD, and thermocouple probe verification per ISO/IEC 17025 clause 6.5.2
• Pre-conditioning of samples prior to rheological, viscometric, or spectroscopic analysis where thermal history impacts structural response
• Supporting cold-trap operation in vacuum systems and cryogenic sample preparation workflows

FAQ

What fluids are compatible with the TLC15-5 bath?

Water, 20–50% aqueous glycol solutions, and low-viscosity silicone oils (up to 100 cSt at 25 °C) are recommended. Avoid halogenated solvents, strong acids/bases, or fluids with vapor pressures exceeding 100 mbar at 60 °C.
Can the TLC15-5 maintain temperature during external heat load fluctuations?

Yes—the PID controller dynamically adjusts compressor duty cycle and heater output to compensate for transient loads up to 300 W, provided the external loop flow rate remains within 0.5–2.0 L/min.
Is the RS232 interface optically isolated?

No. The RS232 port uses standard TTL-level signaling and requires proper grounding continuity between host and instrument to prevent communication errors.
Does the unit include calibration documentation?

A factory-issued conformity statement and CE Declaration of Conformity are supplied. NIST-traceable calibration certificates are available as optional accessories upon request.
What is the typical cooldown time from 20 °C to –10 °C in a full 5 L bath?

Approximately 45 minutes using deionized water, depending on ambient temperature and insulation of the external setup.