Daxluot DLT-1006 Low-Temperature Constant-Temperature Circulating Bath

Overview

The Daxluot DLT-1006 Low-Temperature Constant-Temperature Circulating Bath is an engineered thermal management system designed for precise, stable, and bidirectional temperature control in laboratory and quality assurance environments. Operating on a dual-mode refrigeration–heating principle, it utilizes a hermetically sealed air-cooled compressor paired with PID-controlled resistive heating elements to maintain setpoint accuracy across its full operational range of −10 °C to 100 °C. Unlike passive water baths, the DLT-1006 integrates a high-efficiency, low-heat-generation circulation pump capable of delivering 10 L/min flow—enabling uniform thermal distribution both within the 6 L stainless steel bath chamber and through external process loops (e.g., jacketed reactors, viscometers, or spectrophotometer cells). Its core function is to serve as a reliable, externally referenced thermal source or sink, supporting applications requiring dynamic thermal conditioning under controlled ambient conditions.

Key Features

• High-resolution backlit LCD display with real-time monitoring of setpoint and actual bath temperature, powered by XMT-series analog-digital PID control architecture for minimized overshoot and rapid stabilization.
• Ergonomic ABS-molded controller housing featuring rounded-edge (R-corner) design to reduce impact risk and enhance operator safety during routine handling.
• Integrated closed-loop refrigeration system with dual-stage protection: compressor over-temperature cutoff and motor over-current interruption—ensuring long-term reliability under continuous operation.
• Low-noise, brushless circulation motor coupled with a non-heat-generating impeller design; operates at <45 dB(A), suitable for noise-sensitive analytical labs.
• 304 stainless steel bath interior, top plate, and coil-mounted refrigeration manifold—resistant to corrosion from aqueous buffers, organic solvents, and mild acids commonly used in QC and R&D workflows.
• Multi-layer safety architecture including dry-heater protection (triggered at low liquid level), independent over-temperature alarm (adjustable threshold), and simultaneous visual–audible alert activation.
• Modular functional control: discrete ON/OFF toggles for heating, cooling, internal circulation, and external circulation—allowing flexible configuration for method-specific thermal protocols.
• Tool-free side panel access via snap-fit mounting; integrated rear ventilation grilles and optimized internal airflow routing prevent thermal buildup around electronics and compressor housing.
• Hidden bottom-mounted drain valve with 304 stainless steel bayonet-style connectors for inlet/outlet ports—compatible with standard 10 mm OD silicone tubing and quick-disconnect fittings.

Sample Compatibility & Compliance

The DLT-1006 accommodates a broad spectrum of sample containers—including glass beakers (up to 1 L), metal reaction vessels, and immersion probes—within its 270 × 200 × 130 mm working chamber. Its open-top configuration (180 × 140 mm aperture) permits unobstructed access for sensor insertion, stirrer placement, or optical path alignment. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets CE marking requirements for electromagnetic compatibility (EN 61326-1). While not certified for GMP production environments, its temperature stability (±0.05 °C) and traceable calibration capability support GLP-aligned validation per ISO/IEC 17025:2017 Annex A.2 when operated with NIST-traceable reference thermometers.

Software & Data Management

The DLT-1006 operates as a standalone analog-digital hybrid instrument without embedded firmware or network connectivity. All parameter settings—including temperature setpoint, PID tuning constants (P/I/D), and alarm thresholds—are configured locally via membrane keypad and retained in non-volatile memory during power loss. For laboratories requiring electronic recordkeeping, optional third-party data loggers (e.g., Omega OM-DAQPRO-5300) may be interfaced via the analog 0–5 V output port (scalable to full temperature range), enabling time-stamped acquisition compliant with FDA 21 CFR Part 11 when deployed with validated software and audit-trail-enabled systems.

Applications

This circulating bath supports reproducible thermal conditioning in diverse domains: rheological testing (e.g., Brookfield viscometer calibration at fixed shear temperatures), pharmaceutical dissolution apparatus temperature control (USP ), polymer crystallization kinetics studies, enzyme activity assays requiring sub-ambient incubation, and calibration of RTDs and thermistors against primary standards. It is routinely deployed in university teaching labs for heat transfer experiments, in petrochemical QA labs for flash point and distillation simulations, and in food science facilities for accelerated shelf-life thermal stress testing.

FAQ

What is the minimum recommended fluid volume to ensure safe operation?
The bath must contain ≥4.5 L of compatible fluid (deionized water, 30% ethylene glycol/water mix, or silicone oil) to activate low-level protection and prevent heater dry-firing.
Can the unit maintain −10 °C while simultaneously supplying external flow?
Yes—external circulation remains active across the full temperature range; however, sustained sub-zero operation with high external flow (>6 L/min) may extend stabilization time by up to 12 minutes due to thermal load inertia.
Is the stainless steel bath resistant to acetone or methanol exposure?
304 stainless steel exhibits good resistance to short-term immersion in these solvents; prolonged contact (>24 h) is not recommended without post-rinse with deionized water to prevent surface passivation breakdown.
Does the unit include factory calibration documentation?
A basic verification report (showing three-point temperature deviation check at 0 °C, 25 °C, and 60 °C) is supplied; full ISO/IEC 17025 calibration certificates require third-party service.
What maintenance intervals are recommended for optimal longevity?
Compressor oil inspection every 24 months; condenser coil cleaning every 6 months in dust-prone environments; annual verification of PID loop response using a calibrated reference thermometer.