DRETOP TDK-8AX Benchtop Heating Water Bath

Overview

The DRETOP TDK-8AX Benchtop Heating Water Bath is a precision-engineered, non-circulating laboratory water bath designed for stable, uniform thermal conditioning of samples in research, quality control, and routine analytical workflows. Operating on the principle of direct resistive heating via a fully submerged, sealed tubular heater, the unit maintains setpoint temperature through a closed-loop PID control system that continuously monitors bath temperature using a high-accuracy Pt100-class sensor. Unlike recirculating systems, the TDK-8AX relies on natural convection and optimized internal geometry—including a laser-cut, perforated 304 stainless steel liner—to promote thermal homogeneity across its 22 L working volume. Its RT+5°C to 100°C operating range supports common applications including enzyme incubation, sample thawing, reagent pre-warming, dissolution testing, and auxiliary heating for jacketed reactors or distillation setups. The device complies with fundamental electrical safety requirements per IEC 61010-1 and is constructed to meet general laboratory environmental conditions defined in ISO/IEC 17025 Annex A.3 for equipment used in accredited testing laboratories.

Key Features

• Microprocessor-based PID temperature controller with LED digital display, offering 0.1°C resolution and ±0.5°C stability at setpoint
• 304 stainless steel inner tank and lid—corrosion-resistant, non-reactive, and compatible with aqueous and mild chemical media
• Electrostatically coated cold-rolled steel outer housing for mechanical durability and chemical splash resistance
• Multi-layer insulated chamber design minimizing heat loss and improving energy efficiency (1500 W nominal input)
• Integrated dry-run protection: automatic heating cutoff and audible alarm triggered by real-time water level sensing
• Over-temperature safety cutoff with independent thermal fuse, preventing thermal runaway beyond 105°C
• One-touch drain valve for rapid, spill-free medium replacement; compatible with deionized or distilled water only
• Power-loss memory function retaining last-used settings and enabling automatic recovery upon grid restoration

Sample Compatibility & Compliance

The TDK-8AX accommodates standard laboratory glassware—including beakers, flasks, test tubes, and reaction vessels—up to 200 mm in height and 150 mm in diameter. Its open-bath configuration permits direct immersion of temperature probes, sensors, or sample containers without flow restrictions. While not certified for GLP/GMP production environments, the unit meets functional prerequisites for method validation under USP , ISO 13485 Annex C, and ASTM E2592–18 (Standard Practice for Calibration of Laboratory Water Baths). It supports traceable calibration using NIST-traceable reference thermometers (e.g., Fluke 1523 or similar) and is routinely deployed in educational labs, QC labs for pharmaceutical excipient testing, and environmental sample preparation per EPA Method 1664B. Note: Use of tap water is strictly discouraged due to scale formation risk; only distilled or Type III purified water is recommended to preserve heater longevity and sensor accuracy.

Software & Data Management

The TDK-8AX operates as a standalone analog-digital hybrid instrument with no embedded firmware-based data logging. All operational parameters—including setpoint, real-time temperature, timer status, and alarm events—are displayed locally via the front-panel LED interface. For integration into networked lab environments, optional RS485 communication modules (sold separately) enable Modbus RTU protocol connectivity to SCADA or LIMS platforms. When paired with DRETOP’s optional 30-segment programmable controller (model PC-30), users can define time-temperature profiles for unattended operation, supporting protocols such as ISO 17025 Clause 5.5.2 (equipment software verification). Audit trails are maintained manually via operator logbooks; electronic audit trail functionality requires external data acquisition hardware compliant with FDA 21 CFR Part 11.

Applications

• Pre-incubation of microbial cultures and cell suspensions prior to plating or assay setup
• Controlled warming of viscous reagents (e.g., agarose, glycerol stocks, polymer solutions) to ensure homogeneity before pipetting
• Support heating for Soxhlet extraction, Kjeldahl digestion, and hot-stage microscopy sample preparation
• Temperature stabilization of pH electrodes, conductivity cells, and dissolved oxygen probes during calibration
• Thermal equilibration of reference standards used in calorimetry or thermal analysis instrumentation
• Education-focused demonstrations of heat transfer kinetics, phase change behavior, and Arrhenius reaction rate dependence

FAQ

Is the TDK-8AX suitable for use with organic solvents?
No. This unit is rated exclusively for aqueous media. Immersion of flammable or corrosive solvents poses fire hazard and material compatibility risks.
Can the temperature resolution be improved beyond 0.1°C?
No. The built-in controller provides fixed 0.1°C resolution; higher-resolution measurement requires an external calibrated thermometer.
Does the unit include a calibration certificate?
No. Factory calibration is performed per internal QA procedures; users must perform initial and periodic verification using traceable standards.
What maintenance is required to ensure long-term accuracy?
Monthly descaling with 5% citric acid solution (if using non-distilled water), quarterly inspection of drain valve seal integrity, and annual verification of sensor offset against a reference thermometer.
Is it possible to retrofit a circulation pump?
Not without voiding warranty and compromising safety certification; circulation capability requires structural redesign and is available only in the TDK-B series models.