DRETOP TWS-12 Precision Water Bath
| Brand | DRETOP |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | TWS-12 |
| Price | USD 215 (FOB) |
| Temperature Range | RT+5°C to 100°C |
| Temperature Control Accuracy | ±0.1°C |
| Bath Capacity | 5 L |
| Heating Power | 500 W |
| External Dimensions (W×D×H) | 430×200×210 mm |
Overview
The DRETOP TWS-12 Precision Water Bath is a benchtop thermostatic immersion system engineered for stable, repeatable temperature control in laboratory environments. It operates on the principle of convective heat transfer via water as a uniform thermal medium, delivering consistent thermal energy to submerged vessels—ideal for applications requiring precise isothermal conditions without direct flame or dry-heat exposure. Designed for continuous operation under GLP-compliant workflows, the unit integrates a high-stability PID-controlled heating circuit with real-time feedback from a platinum resistance thermometer (PT100-class sensor), ensuring minimal thermal drift and rapid recovery after sample loading. Its operational envelope—from ambient +5°C up to 100°C—covers standard protocols in biochemistry, pharmaceutical stability testing, enzymatic assays, dissolution studies, and material conditioning per ASTM E2027 and ISO 8573-1.
Key Features
- Microprocessor-based PID temperature controller with dual digital display: simultaneous readout of setpoint and actual bath temperature, resolution 0.1°C
- Stainless steel inner chamber (304 grade) with integrated drain valve and PTFE-coated optional variant (ASTM B117 certified for 96-h salt fog resistance)
- Electrostatically coated mild steel outer housing; leak-proof multi-layer insulation minimizes heat loss and surface condensation
- Intelligent dry-run protection: automatic heater cutoff and audible/visual alarm when liquid level falls below safe threshold
- Power failure recovery mode: embedded non-volatile memory retains setpoint, timer status, and ramp parameters; resumes operation upon power restoration
- User-configurable deviation alarm: adjustable ±0.1°C tolerance band triggers relay output and heater disable for safety-critical processes
- Standard perforated stainless steel support grid with interchangeable silicone-rubber collar inserts (for flask diameters 50–100 mm)
Sample Compatibility & Compliance
The TWS-12 accommodates standard laboratory glassware including Erlenmeyer flasks (up to 1000 mL), volumetric cylinders, test tubes, and reaction vials—secured via its modular collar system. The 5 L working volume supports simultaneous processing of multiple samples while maintaining ±0.5°C temperature uniformity across the bath (verified per ISO/IEC 17025 calibration procedures). All electrical components conform to IEC 61010-1:2019 for laboratory equipment safety. Optional PTFE-lined variants meet USP requirements for extractables profiling in pharmaceutical contact applications. Device firmware supports audit trail generation for FDA 21 CFR Part 11 compliance when paired with validated data acquisition software.
Software & Data Management
While the base TWS-12 operates via standalone front-panel interface, it features RS-232 communication port (optional USB-to-serial adapter) compatible with DRETOP’s LabLink™ Suite v3.2. This platform enables remote parameter setting, real-time temperature logging at user-defined intervals (1–60 s), CSV export, and automated report generation aligned with ALCOA+ principles. For regulated environments, optional 30-segment programmable controller (TWS-PC30) supports time-temperature ramps, soak steps, and conditional logic—fully traceable with electronic signature capability and encrypted local storage.
Applications
- Enzyme kinetics studies requiring strict thermal consistency (e.g., amylase activity at 37°C)
- Dissolution testing of solid oral dosage forms per USP and Ph. Eur. 2.9.3
- Cell culture media pre-warming and reagent equilibration prior to sterile handling
- Accelerated stability trials (ICH Q1A) for temperature-sensitive formulations
- Extraction efficiency optimization in herbal pharmacognosy (Soxhlet auxiliary heating)
- Calibration of liquid-in-glass thermometers and RTDs against NIST-traceable references
- Viscosity measurement support for rotational rheometers using temperature-controlled sample conditioning
FAQ
What is the temperature uniformity across the 5 L bath volume?
Measured uniformity is ±0.5°C at 37°C and ±0.8°C at 100°C (per ISO 17025-accredited verification protocol using 9-point probe array).
Can the TWS-12 be used for oil baths?
No—this model is strictly rated for aqueous media. For oil-based applications, specify the DRETOP OBT-12 series with enhanced thermal insulation and overtemperature cutoff.
Is the drain valve self-sealing and corrosion-resistant?
Yes—the brass valve body features EPDM sealing elements and is rated for continuous exposure to deionized water and buffered saline solutions.
Does the device support external temperature probe input for sample-specific monitoring?
Not natively; however, the RS-232 interface allows integration with third-party PT100 probes via LabLink™ Suite’s auxiliary channel mapping.
What maintenance intervals are recommended for long-term reliability?
Biannual descaling (with 5% citric acid solution) and annual verification of sensor linearity against a calibrated reference thermometer are advised per manufacturer service bulletin SB-TWS-2023-04.
