DRETOP TWS-11 Precision Water Bath
| Brand | DRETOP |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Model | TWS-11 |
| Operating Temperature Range | RT + 5°C to 100°C |
| Temperature Control Accuracy | ±0.1°C |
| Bath Capacity | 2.5 L |
| Heating Power | 400 W |
| External Dimensions (W×D×H) | 300 × 200 × 210 mm |
Overview
The DRETOP TWS-11 Precision Water Bath is a benchtop thermostatic immersion system engineered for stable, repeatable temperature control in laboratory applications requiring gentle, uniform heating of samples in aqueous or water-miscible media. It operates on the principle of resistive heating combined with closed-loop PID feedback regulation, delivering precise thermal environments for protocols such as enzyme incubation, sample thawing, reagent equilibration, dissolution testing, and controlled evaporation. Designed for continuous operation under standard ambient conditions (15–30°C), the unit maintains setpoint stability within ±0.1°C across its full operating range (RT + 5°C to 100°C), making it suitable for routine QC/QA workflows and academic research where thermal reproducibility is critical.
Key Features
- Microprocessor-based PID temperature controller with dual digital display: simultaneous readout of setpoint and real-time bath temperature, backed by 0.1°C resolution and ±0.1°C control accuracy.
- Stainless steel inner chamber with PTFE-coated option (available upon request) — certified per ASTM B117 for 96-hour neutral salt spray resistance, ensuring long-term corrosion resilience against acidic, alkaline, or saline solutions.
- Integrated dry-run protection: automatic heater cutoff and audible/visual alarm activation when water level falls below the minimum operational threshold — no user calibration required.
- Intelligent power-fail recovery: embedded non-volatile memory preserves all active parameters (setpoint, timer, ramp profiles) during unexpected power interruption; resumes operation automatically upon restoration of supply voltage.
- Ergonomic design: front-panel one-touch switch, bottom-mounted drain valve for rapid fluid exchange, electrostatically coated exterior housing, and removable perforated stainless steel support tray compatible with multiple flask diameters via interchangeable silicone-rimmed collar inserts.
Sample Compatibility & Compliance
The TWS-11 accommodates standard laboratory glassware including Erlenmeyer flasks (50–1000 mL), beakers, test tubes, and volumetric cylinders. Its 2.5 L working volume supports single-vessel immersion up to Ø150 mm diameter. The device complies with IEC 61010-1:2010 safety standards for electrical equipment used in laboratory environments. Optional configurations meet GLP/GMP documentation requirements through audit-trail-capable firmware (when paired with programmable controller add-on), supporting 21 CFR Part 11-compliant electronic records when integrated into validated networked lab systems.
Software & Data Management
While the base model operates via standalone front-panel interface, optional accessories expand digital functionality: a 30-segment programmable controller enables time-temperature ramping, hold steps, and cycle repetition — ideal for multi-stage protocols such as polymer hydration or protein denaturation studies. Data logging capability (via RS485 or USB interface) allows export of timestamped temperature histories in CSV format for traceability. All firmware updates are performed via secure offline binary upload to ensure integrity and prevent unauthorized modification.
Applications
- Biological sample preparation: controlled thawing of cryopreserved cell cultures and serum aliquots without thermal shock.
- Pharmaceutical quality control: USP compliant temperature stabilization of sterile preparations prior to filtration or assay.
- Environmental analysis: digestion of water and soil extracts at defined temperatures prior to heavy metal quantification (EPA Method 3050B).
- Chemical synthesis: reflux support for low-boiling-point solvents and catalyst activation under inert atmosphere.
- Materials science: conditioning of polymer films and hydrogels to assess swelling kinetics at physiological or accelerated aging temperatures.
FAQ
What is the minimum ambient temperature required for stable operation?
The unit is rated for use in environments between 15°C and 30°C. Operation below 15°C may extend warm-up time and affect long-term stability due to increased thermal load.
Can the TWS-11 be used with organic solvents?
No — this model is designed exclusively for aqueous or water-miscible media. For flammable or volatile organic solvents, a circulating oil bath or specialized solvent-safe bath (e.g., DRETOP UHP series) is recommended.
Is calibration certificate included with shipment?
A factory-issued calibration report (traceable to NIM China) is provided standard. ISO/IEC 17025-accredited third-party calibration is available as an optional service.
How often should the water bath be cleaned and descaled?
We recommend weekly visual inspection and biweekly cleaning with mild detergent; descaling frequency depends on local water hardness but typically ranges from monthly to quarterly using food-grade citric acid solution.
Does the unit support remote monitoring via Ethernet or Wi-Fi?
Not natively — however, the optional programmable controller includes Modbus RTU over RS485, enabling integration into SCADA or LabVantage systems via industrial gateway hardware.
