Brookfield TC-Series Constant Temperature Circulating Baths

Overview

The Brookfield TC-Series Constant Temperature Circulating Baths are precision-engineered thermal control systems designed for laboratory applications requiring stable, uniform, and repeatable temperature environments. These baths operate on the principle of forced convection via an integrated circulation pump, ensuring homogeneous thermal distribution throughout the bath fluid—whether water, silicone oil, or other compatible heat-transfer media. Unlike passive static baths, the TC-Series maintains tight temperature stability (as low as ±0.01 °C) across defined operating ranges—from ambient +10 °C up to +200 °C—by combining PID-controlled heating with active tap-water or chiller-based cooling. The modular architecture supports integration with external devices such as viscometers, rheometers, spectrophotometers, and sample holders requiring precise thermal conditioning. All models comply with standard electrical safety requirements (UL/CSA 61010-1) and are constructed with corrosion-resistant stainless-steel tanks and insulated housings to minimize thermal drift and energy loss.

Key Features

• Precision temperature control with model-specific stability from ±0.01 °C (TC-150AP/TC-250AP) to ±0.07 °C (TC-150MX/TC-250MX), validated under steady-state conditions per ASTM E1137/E1142 guidelines
• Integrated tap-water cooling coil standard on all TC-150 and TC-250 models—enabling rapid cooldown and extended operation above 80 °C when paired with a regulated municipal supply
• Optional TC-351 recirculating chiller support for sub-ambient operation down to –20 °C, eliminating reliance on facility chilled water infrastructure
• Three controller tiers: AP (capacitive touchscreen with programmable ramp-soak profiles), SD (LCD with scroll interface and dual-speed pump control), MX (basic LCD with single-speed circulation)
• Internal circulation flow rates adjustable from 11 to 16 L/min, optimized for minimal turbulence and maximal thermal homogeneity in both small-volume (6 L) and large-volume (10 L) chambers
• Stainless-steel bath tank with reinforced insulation, sealed electronics compartment, and drip-proof front-panel design meeting IP22 environmental rating

Sample Compatibility & Compliance

The TC-Series accommodates a broad range of sample vessels—including standard 600 mL and 1000 mL beakers (TC-250), test tubes, cuvettes, and custom immersion fixtures—without compromising thermal uniformity. The open-top chamber design allows direct in-bath measurement using probes, sensors, or analytical instrumentation. For GxP-regulated environments, the AP-series controllers support audit-trail-enabled operation compliant with FDA 21 CFR Part 11 requirements when configured with user access controls and electronic signature protocols. All units meet ISO/IEC 17025-relevant thermal validation criteria for calibration laboratories and are routinely employed in USP , , and ASTM D445 viscosity testing workflows. Note: Fluid selection must align with operational temperature limits—silicone oils recommended above 80 °C; deionized water preferred below 95 °C to prevent scaling.

Software & Data Management

TC-250AP and TC-150AP models feature embedded Ethernet and USB interfaces for remote monitoring and control via Brookfield’s proprietary BathLink™ software (Windows-compatible). This platform enables real-time temperature logging, multi-point setpoint scheduling, alarm event history export (CSV), and automated report generation traceable to NIST-calibrated reference standards. Data integrity safeguards include timestamped parameter changes, operator ID tagging, and encrypted local storage—fully aligned with GLP/GMP documentation expectations. SD and MX variants provide RS-232 output for integration into SCADA or LIMS systems via third-party drivers, supporting basic serial polling of current temperature, setpoint, and status flags.

Applications

• Viscosity and rheological measurements requiring isothermal sample conditioning prior to and during analysis (e.g., Brookfield DVNext, CAP2000+)
• Calibration of temperature-sensitive sensors (RTDs, thermistors, infrared detectors) per ISO/IEC 17025 Clause 6.4
• Accelerated stability testing of pharmaceutical formulations per ICH Q1A(R2) guidelines
• Enzyme kinetics studies where reaction rate dependence on temperature must be tightly controlled
• Material testing of polymers, adhesives, and coatings under standardized thermal exposure (ASTM D2124, ISO 293)
• Pre-conditioning of reference standards used in metrology labs accredited to ISO/IEC 17025

FAQ

What is the minimum operating temperature with tap-water cooling alone?
Without the optional TC-351 chiller, the lowest achievable temperature is ambient +10 °C. Tap-water cooling enhances heat rejection but does not enable sub-ambient operation.

Can the TC-250 accommodate larger vessels than 1000 mL?
Yes—the removable cover plate increases vertical clearance, permitting immersion of tall-form cylinders or custom jigs up to 14 inches in height, provided total fluid volume remains within the 10 L rated capacity.

Is fluid-level sensing or auto-fill functionality available?
No. These models rely on manual fill verification. Users must maintain fluid levels between the MIN/MAX marks to ensure proper pump priming and thermal sensor immersion.

Are replacement parts and service manuals available internationally?
Yes. Brookfield provides global technical support, certified calibration services, and a full spare parts catalog—including pump assemblies, PID controllers, and cooling coils—with lead times published on brookfieldengineering.com/support.

How is temperature uniformity verified across the bath chamber?
Per internal QA protocol, uniformity is measured at nine points (center + eight grid positions) at mid-depth using NIST-traceable Class A PT100 probes. Typical deviation is ≤±0.03 °C across the TC-250’s 5″×11″ working area at 37 °C and 100 °C.