Polystat 12122-04 Advanced Refrigerated/Heating Circulating Bath

Overview

The Polystat 12122-04 Advanced Refrigerated/Heating Circulating Bath is a high-performance, dual-mode temperature control system engineered for precision thermal management in demanding laboratory and industrial applications. Utilizing a closed-loop refrigeration circuit combined with a high-wattage immersion heater and a robust dual-mode (pressure/suction) circulation pump, this bath delivers rapid thermal response, exceptional temperature uniformity, and long-term stability across an extended operating range—from cryogenic cooling at –35 °C up to high-temperature operation at +200 °C. Its design adheres to fundamental thermodynamic principles of forced convection heat transfer, where controlled fluid circulation ensures efficient thermal exchange between the bath medium and external devices (e.g., reactors, spectrometers, or material testing fixtures). The system’s architecture supports both internal bath temperature regulation and external loop conditioning—making it suitable for jacketed reactor control, calorimetry calibration, viscosity measurement environments, and thermal cycling validation protocols requiring traceable, repeatable thermal profiles.

Key Features

• Extended temperature range: configurable models support –35 °C to +200 °C, enabling low-temperature crystallization studies and high-temperature polymer processing simulations
• High-precision temperature stability of ±0.05 °C, achieved via PID-controlled refrigeration/heating actuation and real-time feedback from a calibrated Pt100 sensor immersed directly in the bath fluid
• Dual-mode circulation pump delivering up to 21 L/min flow rate and 805 mbar pressure—optimized for low-resistance and high-backpressure external loops alike
• Advanced digital controller with five independent programmable setpoints, user-configurable over-temperature safety cutoff, and adjustable minimum/maximum operational limits
• USB interface for data logging, remote parameter adjustment, and integration into automated lab networks compliant with IEEE 1394 or Modbus RTU protocols
• Integrated safety systems: automatic shutdown on low fluid level detection, over-temperature fault, or pump stall—ensuring equipment protection and experimental integrity
• Multi-language interface (English, French, German) and intuitive LED display with backlighting for ambient-lit or low-light laboratory conditions

Sample Compatibility & Compliance

The Polystat 12122-04 is compatible with water, water-glycol mixtures (up to 50% v/v), silicone oils, and other non-corrosive heat-transfer fluids appropriate for its specified temperature range. Its stainless-steel bath chamber and fluoropolymer-coated internal components resist degradation under prolonged thermal stress and chemical exposure. The unit conforms to IEC 61010-1:2010 for electrical safety in laboratory equipment and carries CE marking for EMC and Low Voltage Directive compliance. It meets UL 61010-1 requirements for North American markets and incorporates design elements aligned with GLP/GMP documentation practices—including audit-trail-capable event logging (via optional software) and password-protected parameter modification. While not inherently 21 CFR Part 11 compliant, its USB data export functionality supports integration with validated third-party LIMS or ELN platforms for regulated environments.

Software & Data Management

The integrated controller supports local operation without external software; however, the USB port enables connection to Windows-based host systems running Polystat Control Suite (v3.2+), a dedicated application for real-time monitoring, scheduled temperature ramping, and CSV-formatted data export. Logged parameters include bath temperature, setpoint, pump status, error codes, and timestamped safety events. All exported files are time-stamped with UTC and include instrument serial number and firmware revision—facilitating traceability per ISO/IEC 17025 clause 7.7. The controller retains up to 1,000 historical temperature readings in non-volatile memory, accessible via menu navigation. Firmware updates are delivered via signed .hex files to prevent unauthorized modification—supporting cybersecurity best practices outlined in NIST SP 800-53 Rev. 5 (RA-5, SI-2).

Applications

• Temperature control of jacketed glass reactors in synthetic chemistry and process development
• Calibration of differential scanning calorimeters (DSC), thermogravimetric analyzers (TGA), and rheometers requiring stable thermal baselines
• Environmental stress screening of electronic components and packaging materials under thermal cycling conditions
• Viscosity measurements using rotational viscometers where bath-induced thermal drift must remain below ±0.05 °C
• Stabilization of optical benches, laser diodes, and interferometric setups sensitive to thermal expansion
• Pre-conditioning of samples prior to mechanical testing (e.g., ASTM D638, ISO 527) across sub-zero to elevated temperatures

FAQ

What is the maximum allowable backpressure for external loop operation?

The dual-mode pump supports up to 805 mbar of static backpressure—sufficient for vertical lift heights exceeding 8 meters or complex manifolds with multiple inline sensors and valves.

Can the bath operate continuously at 200 °C with water as the heat-transfer medium?

No. Water is not suitable above 100 °C at ambient pressure. Silicone oil or specialized high-temp heat-transfer fluids (e.g., Dow Corning 200 Fluid) must be used for operation above 100 °C.

Is the USB interface compatible with LabVIEW or Python-based automation frameworks?

Yes. A documented ASCII command protocol (RS-232 over USB-CDC emulation) is provided in the technical manual, supporting direct integration with LabVIEW VIs or Python’s pySerial library.

Does the unit include fluid-level sensing for all bath volumes?

Yes. Capacitive level detection is standard across both 6 L and 15 L configurations, triggering immediate shutdown if fluid falls below the minimum operational threshold.

How often does the refrigerant require servicing or replacement?

The sealed R-404A refrigeration circuit is designed for maintenance-free operation over 15,000 hours of cumulative runtime under normal laboratory conditions—no scheduled refrigerant replenishment is required.