Daxluot DLT-0506 Low-Temperature Circulating Water Bath

Overview

The Daxluot DLT-0506 Low-Temperature Circulating Water Bath is a precision-engineered temperature control system designed for laboratory environments requiring stable, reproducible thermal conditions across a wide operational range (−5 °C to +100 °C). Utilizing a closed-loop refrigeration cycle with a hermetically sealed air-cooled compressor and PID-controlled resistive heating, the unit maintains thermal uniformity within ±0.05 °C — a performance level suitable for calibration-critical applications, material property testing, and process validation in regulated settings. Its 6-liter stainless steel bath chamber supports both internal temperature equilibration and external circulation via a low-heat-generation, brushless DC circulation pump delivering up to 10 L/min flow. The system is not merely a passive heat source or sink; it functions as an active thermal management platform capable of simultaneous heating and cooling modulation — enabling rapid ramping, precise setpoint hold, and dynamic thermal profiling when integrated with external devices such as viscometers, spectrophotometers, or reaction calorimeters.

Key Features

• High-resolution backlit LCD display with real-time dual-channel monitoring of setpoint and actual bath temperature
• XMT-series analog-digital PID controller offering adaptive tuning, hysteresis suppression, and programmable ramp/soak profiles
• ABS-molded front panel with ergonomic R-radius edges and IP20-rated enclosure for operator safety and lab aesthetics
• Hermetically sealed air-cooled refrigeration system with dual-stage protection: high-pressure cut-off and motor overcurrent sensing
• 304 stainless steel tank, top plate, and coil housing — electropolished and passivated to resist corrosion from aqueous, saline, or mildly acidic media
• Low-noise, maintenance-free circulation pump with thermally isolated magnetic coupling and sealed bearing assembly (L10 life > 20,000 hrs)
• Independent functional toggles for heating, cooling, internal circulation, and external circulation — enabling granular experimental control
• Modular side panels secured by tool-free latches; rear-accessible condenser fins and front-mounted drain valve with 304 stainless steel bayonet fitting
• Integrated dry-run detection circuitry that deactivates heater elements upon liquid level drop below critical threshold, accompanied by audible/visual alarm
• Standard accessories include insulated silicone circulation tubing, thermal cover plate, and quick-connect 304 stainless steel inlet/outlet ports

Sample Compatibility & Compliance

The DLT-0506 accommodates a broad spectrum of sample containers — including glass jacketed reactors (up to Ø150 mm), immersion probes, cuvette holders, and external heat exchangers — thanks to its 180 × 140 mm open-top aperture and 270 × 200 × 130 mm usable depth. Its construction complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets CE marking requirements for EMC (EN 61326-1) and low-voltage directives. While not certified to ISO/IEC 17025 or GLP out-of-the-box, the instrument’s traceable temperature stability (±0.05 °C), audit-ready alarm logs, and configurable setpoint history support integration into GxP-compliant workflows when paired with validated calibration procedures per ASTM E1137/E1137M (Standard Specification for Temperature Calibration Baths).

Software & Data Management

The DLT-0506 operates autonomously via its embedded XMT controller without dependency on PC software. However, optional RS485 Modbus RTU interface (available upon request) enables bidirectional communication with SCADA systems, LIMS, or custom Python/LabVIEW scripts for remote parameter setting, real-time data logging, and event-triggered alerts. All alarm events — including over-temperature, low-level, compressor fault, and sensor open-circuit — are timestamped and retained in non-volatile memory for post-event forensic review. When deployed in FDA-regulated environments, users may implement 21 CFR Part 11-compliant electronic records by coupling the unit with third-party validated data acquisition platforms that enforce user authentication, audit trails, and electronic signatures.

Applications

• Calibration of thermistors, RTDs, and infrared sensors against NIST-traceable references
• Thermal conditioning of optical components during interferometric alignment and laser cavity stabilization
• Viscosity measurement support for rotational rheometers requiring constant bath temperature during shear-rate sweeps
• Stability testing of pharmaceutical formulations per ICH Q1A(R2) guidelines under controlled thermal stress
• Cooling of HPLC column ovens and GC detectors to prevent thermal degradation of sensitive analytes
• Material testing per ASTM D341 (viscosity–temperature charts), ASTM D6377 (vapor pressure), and ISO 2555 (solution viscosity)
• Biological incubation support for enzyme kinetics assays where precise thermal control directly impacts k_cat and K_M determination

FAQ

What is the minimum operating temperature, and does it require pre-cooling?
The DLT-0506 achieves −5 °C without auxiliary pre-cooling; however, ambient temperatures above 30 °C may extend cooldown time. For consistent sub-zero operation, ensure adequate ventilation around the rear condenser grille.
Can the unit maintain temperature stability while circulating externally to a 5-meter tubing loop?
Yes — with proper insulation and flow optimization (recommended minimum 6 L/min), the system sustains ±0.05 °C stability even with 8 m of 10-mm-ID silicone tubing and one inline heat exchanger.
Is the bath fluid limited to water, or can ethanol/water mixtures be used?
The 304 stainless steel chamber is compatible with aqueous solutions and ethanol–water mixtures up to 30% v/v; glycol-based fluids require verification of pump seal compatibility prior to use.
Does the unit support external temperature feedback for cascade control?
No — the DLT-0506 uses only its internal Pt100 sensor for regulation. External probe input is not supported in standard configuration.
How often should the refrigerant charge and compressor oil be serviced?
Under normal laboratory use (8 hrs/day, 5 days/week), the sealed compressor requires no scheduled refrigerant recharge or oil replacement over its rated service life of ≥15 years.