DRETOP TDK-B22 Electrically Heated Constant Temperature Bath

Overview

The DRETOP TDK-B22 Electrically Heated Constant Temperature Bath is a precision-engineered laboratory thermal management system designed for stable, uniform, and reproducible temperature control in aqueous or oil-based media. Operating on resistive heating principles with PID-regulated feedback control, the unit maintains setpoint accuracy within ±0.2 °C across its full operational range (RT+5 °C to 65 °C), making it suitable for applications requiring tight thermal consistency—such as enzyme incubation, sample equilibration prior to analytical measurement, solvent conditioning for extraction protocols, and calibration of temperature-sensitive sensors. Its external circulation capability enables integration with auxiliary equipment—including spectrophotometer cells, viscometers, or reaction jackets—ensuring thermal homogeneity beyond the bath chamber itself. Constructed for long-term reliability in regulated environments, the TDK-B22 complies with general electrical safety standards (IEC 61010-1) and supports documentation practices aligned with GLP and ISO/IEC 17025 laboratory quality frameworks.

Key Features

• Microprocessor-based PID temperature controller with dual digital display: simultaneous readout of setpoint and real-time bath temperature
• High-precision platinum resistance temperature sensor (PT100-class equivalent) integrated into the heating element assembly for direct medium temperature sensing
• 304 stainless steel inner tank with laser-cut perforated baffle plate to enhance convective heat transfer and minimize thermal stratification
• Electrostatically coated steel exterior housing with multi-layer insulating cavity—reducing ambient heat loss and improving energy efficiency
• Integrated electromagnetic circulation pump enabling continuous external flow (max. head: 2.5 m; flow rate: ~8 L/min at 0.5 bar backpressure)
• Auto-recovery function preserving user-defined parameters after power interruption or system reset
• Digital overtemperature alarm with configurable threshold and audible/visual alert—compliant with IEC 60335-1 thermal cut-off requirements
• Low-water level detection circuit with automatic heater shutdown and fault indication to prevent dry-run damage
• Front-panel one-touch drain valve for rapid, spill-free medium replacement

Sample Compatibility & Compliance

The TDK-B22 accommodates standard laboratory glassware up to Ø180 mm in diameter and 300 mm in height. It is compatible with deionized water, distilled water, silicone oils (up to 65 °C), and low-viscosity glycol–water mixtures. Use of tap water is discouraged due to scale formation risk on the immersion-type heating element; routine descaling with 5% citric acid solution is recommended every 200 operating hours when non-purified water is used. The unit meets CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). While not certified to FDA 21 CFR Part 11 out-of-the-box, audit-ready operation is supported via optional RS485 interface (MODBUS RTU protocol) and third-party validated data logging software.

Software & Data Management

The TDK-B22 operates as a standalone instrument but supports optional digital connectivity through an RS485 port (available as factory-installed accessory). When paired with DRETOP’s proprietary LabLink™ communication suite (v3.2+), users can remotely configure temperature profiles, monitor real-time thermal drift, export timestamped CSV datasets, and generate PDF reports compliant with ALCOA+ data integrity principles. The 30-segment programmable controller (optional upgrade) permits time–temperature ramping sequences—for example, simulating accelerated aging protocols per ASTM E1980 or ISO 11348. All configuration changes are logged with operator ID, timestamp, and parameter delta—enabling traceability during internal QA audits.

Applications

• Pre-equilibration of HPLC mobile phases and GC injection liners
• Controlled solubility testing of pharmaceutical excipients per USP <728>
• Thermal stabilization of photometric cuvettes during UV-Vis absorbance measurements
• Incubation of microbiological culture media prior to pour-plating
• Calibration verification of thermistors, RTDs, and infrared thermometers against NIST-traceable references
• Supporting ASTM D2196 (viscosity of paints) and ISO 3219 (rheological behavior of polymer solutions) test methods
• Environmental simulation for corrosion testing of metal coupons per ASTM G31

FAQ

Is the TDK-B22 suitable for use with organic solvents such as acetone or ethanol?
No—this model is rated exclusively for aqueous and high-flash-point silicone oils (flash point >150 °C). Flammable liquids pose explosion hazards and may degrade seals or sensor coatings.
Can the external circulation port be connected to a chiller for sub-ambient operation?
Not without modification. The TDK-B22 is a heating-only system. For cooling capability, consider the DRETOP WDC-B54 series or add-on refrigerated circulators compatible with 1/4″ NPT inlet/outlet fittings.
What maintenance intervals are recommended for optimal performance?
Inspect water level sensor and drain valve monthly; clean interior tank and heating element quarterly using food-grade citric acid solution; verify temperature accuracy annually using a calibrated reference thermometer per ISO/IEC 17025 clause 6.5.
Does the unit support validation documentation packages for GMP environments?
Yes—DRETOP provides IQ/OQ templates upon request, including installation checklists, operational boundary testing protocols, and electronic signature-ready calibration records compatible with most QMS platforms.
Is the 22 L capacity nominal or usable volume?
The 22 L figure refers to the total internal volume of the stainless steel tank. Usable working volume is approximately 19.5 L when accounting for pump intake clearance and recommended minimum fill level (15 cm above heater element).