CZGY TT-DFY-155L Low-Temperature Constant-Temperature Reaction Bath

Overview

The CZGY TT-DFY-155L Low-Temperature Constant-Temperature Reaction Bath is an engineered thermal management system designed for precise, stable temperature control across demanding laboratory applications requiring both refrigeration and heating capabilities. Operating on the principle of forced internal circulation within a thermally insulated stainless steel bath chamber, it maintains uniform thermal conditions via a dual-mode compressor-based cooling system and high-power resistive heating elements. Unlike passive water baths or simple heating circulators, this unit integrates active refrigeration—enabling operation from ambient down to 0 °C—while sustaining stability up to 100 °C. Its robust architecture supports extended-duration experiments in synthetic chemistry, enzymatic assays, material curing, and sample pre-conditioning where thermal drift must remain within ±0.5 °C over time. The bath’s 155-liter capacity accommodates large-volume reactors, jacketed vessels, or multiple parallel setups—making it suitable for scale-up validation studies in QC laboratories and academic research facilities.

Key Features

• 304 stainless steel inner tank and outer casing—resistant to corrosion from aqueous, mildly acidic, and organic solvent environments
• Dual-mode temperature regulation: Danfoss-brand hermetic compressor (1500 W) paired with 6000 W high-efficiency heating elements
• A-class PT100 temperature sensor (4-wire configuration, 150 mm immersion depth) with traceable calibration compliance
• Intelligent microprocessor controller featuring backlit LCD interface, real-time setpoint/actual temperature display, and programmable timer (0–9999 min/h)
• Internal recirculation pump with adjustable flow rate—optimized for homogeneous thermal distribution without external plumbing
• No-load temperature uniformity ≤ ±0.5 °C across the full working volume (600 × 600 × 400 mm)
• Compliant with IEC 61010-1 safety standards for laboratory electrical equipment; CE-marked design architecture

Sample Compatibility & Compliance

The TT-DFY-155L accommodates a wide range of sample containers—including glass-jacketed reactors (up to 50 L), stainless steel pressure vessels, immersion coils, and multi-vessel racks—without compromising thermal fidelity. Its open-bath geometry allows direct placement of reaction flasks, condensers, and auxiliary sensors. The system meets fundamental requirements for GLP-compliant thermal validation protocols when used with documented calibration procedures. While not inherently 21 CFR Part 11 compliant (as it lacks audit-trail-capable software), its hardware-level temperature logging output (via analog 0–5 V or 4–20 mA signal option) enables integration into validated data acquisition systems meeting FDA, ISO/IEC 17025, and ASTM E2877-22 thermal uniformity assessment guidelines.

Software & Data Management

The standard configuration includes local setpoint programming and real-time monitoring via front-panel interface only. Optional RS485 Modbus RTU communication port enables integration with LabVIEW, SCADA, or custom Python-based data loggers for time-stamped temperature recording, remote setpoint adjustment, and alarm event capture. When paired with third-party software platforms supporting IEEE 1451.2 transducer electronic data sheets (TEDS), the PT100 sensor’s calibration coefficients can be auto-loaded to improve measurement traceability. No embedded cloud connectivity or proprietary software suite is provided—ensuring compatibility with institutional IT security policies restricting outbound network access.

Applications

• Controlled-rate crystallization and polymorph screening in pharmaceutical development
• Enzyme kinetic studies requiring sub-ambient stabilization of assay buffers
• Distillation and reflux setups with jacketed condensers and vacuum manifolds
• Accelerated aging tests for polymer composites under ISO 2812-3 thermal cycling conditions
• Pre-chilling of chromatographic mobile phases prior to HPLC injection
• Long-term storage of temperature-sensitive biological reagents at defined setpoints (e.g., 4 °C, 25 °C, 37 °C)
• Calibration verification of secondary temperature probes using NIST-traceable reference standards

FAQ

What is the maximum allowable operating temperature for continuous use?
The unit is rated for sustained operation at 100 °C; however, prolonged use above 90 °C may reduce compressor service life and requires periodic verification of refrigerant charge integrity.
Can external circulation be added to this model?
The TT-DFY-155L is configured exclusively for internal circulation. External recirculation requires retrofitting with a compatible external pump manifold—a modification not supported under warranty.
Is the PT100 sensor field-replaceable and calibrated per ISO/IEC 17025?
Yes—the A-class PT100 probe is user-serviceable and supplied with a factory calibration certificate. Users may perform in-house recalibration against a certified reference thermometer per ASTM E74-22 procedures.
Does the timer support countdown-to-shutdown functionality?
Yes—the programmable timer offers both count-up elapsed time and count-down auto-shutdown modes, configurable independently of temperature setpoints.
What maintenance intervals are recommended for the Danfoss compressor?
Annual inspection of refrigerant pressure, oil level, and condenser coil cleanliness is advised. Full service—including refrigerant recovery, filter-drier replacement, and performance validation—is recommended every 24 months under continuous operation.