Daxluot DLT-2006 Low-Temperature Circulating Water Bath

Overview

The Daxluot DLT-2006 Low-Temperature Circulating Water Bath is an engineered thermal management system designed for precise, stable, and bidirectional temperature control in laboratory and quality assurance environments. Utilizing a closed-loop, forced-circulation architecture with integrated compressor-based refrigeration and resistive heating elements, the unit maintains setpoint temperatures across a broad operational range of −20 °C to 100 °C. Its core function is to serve as a reliable, uniform thermal source or sink—delivering consistent heat transfer to external devices (e.g., viscometers, spectrophotometer jackets, reaction blocks) or directly stabilizing samples immersed in its 6-liter stainless steel bath chamber. The system operates on the principle of convective thermal equilibrium: a low-heat-generation circulation pump ensures laminar, non-turbulent fluid motion, while PID-controlled feedback regulates power delivery to both heating and cooling subsystems in real time—enabling high reproducibility in temperature-sensitive protocols such as enzyme kinetics, polymer crystallization studies, calibration of thermal sensors, or stability testing per ICH Q1 guidelines.

Key Features

• High-resolution backlit LCD display with simultaneous readout of setpoint and actual bath temperature, powered by XMT-series analog-digital PID controller for responsive, overshoot-minimized regulation.
• ABS-molded ergonomic housing with rounded-edge safety design, minimizing accidental impact injury during routine lab operation.
• Hermetically sealed air-cooled compressor refrigeration system incorporating dual-stage thermal protection—guarding against coil overheat and motor overcurrent failure under sustained low-temperature load.
• Brushless, maintenance-free circulation pump with thermally isolated motor windings; delivers 10 L/min flow at minimal acoustic emission (<45 dB(A)) and negligible self-heating effect on bath fluid.
• 304 stainless steel bath vessel and deck surface, electropolished and passivated to resist corrosion from aqueous buffers, organic solvents, and saline solutions—compatible with ISO 8573-1 clean air standards for adjacent instrumentation zones.
• Multi-layer safety architecture: dry-run detection via level sensor, independent over-temperature cutoff (mechanical + electronic), dual-mode alarm activation (visual LED + audible buzzer), and automatic power cut-off upon fault confirmation.
• Independent functional toggles for heating, cooling, and circulation modes—enabling rapid thermal ramping (e.g., −20 °C → 25 °C in <12 min) without mode conflict or controller reset.
• Front-accessible side panels secured by tool-free latches; integrated rear-mounted ventilation grilles ensure unimpeded convection cooling of compressor and power electronics—reducing thermal drift during extended operation (>72 h).
• Hidden bottom-mounted drain valve and standardized 304 stainless steel bayonet-style fluid ports (inlet/outlet/drain) rated for continuous use at full pressure and temperature extremes.
• Standard accessories include insulated silicone circulation tubing (with thermal wrap), hermetic bath lid, and quick-connect drainage spigot—supporting GLP-compliant setup documentation and traceable fluid handling.

Sample Compatibility & Compliance

The DLT-2006 accommodates immersion of standard laboratory vessels (up to Ø120 mm × 150 mm height) and interfaces seamlessly with external equipment via 1/4″–1/2″ NPT or hose-barb fittings. Its 304 stainless steel wetted surfaces meet ASTM A240 requirements for corrosion resistance in neutral-to-moderately acidic media. While not certified to UL/CSA or CE for standalone medical device integration, the unit complies with IEC 61010-1:2010 safety standards for laboratory electrical equipment. Its temperature stability of ±0.05 °C satisfies calibration traceability requirements for secondary reference baths used in ISO/IEC 17025-accredited testing laboratories—particularly when validating thermistor probes, RTDs, or infrared thermometers per ASTM E74 or ISO 17037.

Software & Data Management

The DLT-2006 operates as a stand-alone analog-digital hybrid instrument with no embedded firmware or network interface. All control logic resides in the XMT PID module, which supports manual parameter tuning (P/I/D gains, cycle time, anti-windup) via front-panel keypad. For regulated environments requiring audit trails, optional RS485 Modbus RTU output (add-on module) enables integration with SCADA systems or LIMS platforms supporting FDA 21 CFR Part 11-compliant electronic records—provided external data loggers capture timestamped temperature readings with NIST-traceable calibration certificates. No proprietary software is required; configuration remains fully accessible through physical controls, ensuring long-term operational continuity without vendor lock-in or OS dependency.

Applications

• Calibration of temperature-sensitive analytical instruments (e.g., HPLC column ovens, FTIR sample compartments, differential scanning calorimeters).
• Controlled-rate cooling/heating of chemical reaction mixtures in jacketed reactors or glassware assemblies.
• Stability testing of pharmaceutical formulations per ICH Q5C and USP , including freeze-thaw cycling and accelerated degradation studies.
• Thermal conditioning of materials prior to tensile, rheological, or dielectric property measurement (ASTM D638, ISO 3146, IEC 60250).
• Supporting cryo-microscopy sample stages, electrophoresis buffer tanks, and cell culture incubator auxiliary cooling loops.
• Quality control verification of thermal switches, thermostats, and temperature transmitters in manufacturing QA labs.

FAQ

What is the minimum ambient operating temperature for the DLT-2006?

The unit is rated for operation in ambient environments between 15 °C and 30 °C. Below 15 °C, compressor oil viscosity increases, potentially delaying startup and reducing refrigeration efficiency.
Can the DLT-2006 maintain −20 °C with 100% bath fill volume?

Yes—full 6 L capacity is supported at all temperatures within specification; however, cooling time to −20 °C increases by ~25% compared to 3 L fill due to higher thermal mass.
Is deionized water recommended for long-term use?

Deionized water is acceptable but requires periodic biocide treatment (e.g., silver ion cartridges) to prevent microbial growth; 10–20% ethylene glycol/water mixture is preferred for sub-zero operation and corrosion mitigation.
Does the unit support external temperature probe feedback for chamber control?

No—the DLT-2006 regulates only based on internal Pt100 sensor input; external probe integration requires third-party PID controllers with analog input capability.
What maintenance intervals are recommended for the compressor system?

Annual inspection of condenser coil cleanliness and refrigerant charge verification by qualified HVAC-R technician is advised; no scheduled oil changes are required for the sealed rotary compressor.