DRETOP UHP-28 Precision Constant-Temperature Water Bath

Overview

The DRETOP UHP-28 Precision Constant-Temperature Water Bath is an engineered laboratory thermal platform designed for high-reproducibility temperature-controlled immersion applications. Operating on resistive heating with closed-loop PID feedback control, it maintains stable thermal environments within a working range of ambient +5°C to 100°C—ideal for applications requiring precise thermal conditioning of samples in glassware, reaction vessels, or biological containers. Its architecture integrates thermal insulation, stainless steel construction, and real-time monitoring logic to support unattended operation in regulated environments. Unlike basic water baths, the UHP-28 implements dual-sensor redundancy, programmable alarm thresholds, and non-volatile parameter retention—features aligned with GLP-compliant workflows where traceability, repeatability, and failure resilience are mandatory.

Key Features

• Microprocessor-based PID temperature controller with dual digital display: simultaneous readout of setpoint and actual bath temperature, resolution 0.1°C
• High-stability temperature control: ±0.1°C accuracy, ±0.5°C uniformity across the 17 L stainless steel bath chamber
• Integrated dry-run protection: automatic heater cutoff when liquid level falls below safe threshold; visual and audible alert activation
• Intelligent power-loss recovery: EEPROM-backed parameter storage preserves setpoint, timer status, and ramp profiles during unexpected shutdowns
• Configurable over-temperature alarm: user-defined deviation limit (±0.1°C adjustable), triggering both audiovisual alerts and immediate heating termination
• Electrostatically coated exterior housing with 304 stainless steel inner tank and lid; optional PTFE-coated interior available for enhanced corrosion resistance (ASTM B117 compliant)
• Ergonomic design: front-mounted drain valve, removable perforated stainless steel shelf, and interchangeable collar inserts for flask diameters from 25 mm to 100 mm

Sample Compatibility & Compliance

The UHP-28 accommodates standard laboratory glassware—including Erlenmeyer flasks, round-bottom flasks, test tubes, and sample vials—via its modular collar system. The 17 L bath volume supports immersion of up to eight 1000 mL flasks or four 2000 mL vessels simultaneously. All wetted surfaces meet ISO 8573-1 purity class 4 for non-contaminating contact with aqueous and mildly acidic/basic solutions. The unit complies with IEC 61010-1:2010 safety standards for electrical equipment used in laboratory environments. Optional firmware upgrades enable audit-trail logging and electronic signature support per FDA 21 CFR Part 11 requirements—suitable for GMP/GLP-regulated quality control labs conducting dissolution testing, enzyme incubation, or reagent pre-warming.

Software & Data Management

While the base UHP-28 operates via standalone microcontroller interface, it supports optional integration with DRETOP’s PC-based LabLink Suite (v3.2+). This software enables remote monitoring, 30-segment programmable temperature ramping, time-stamped data export (CSV/Excel), and automated report generation with metadata embedding (operator ID, batch number, instrument serial). All logged temperature events—including alarms, power interruptions, and manual overrides—are timestamped with millisecond precision and stored in tamper-evident binary logs. Data integrity is enforced via SHA-256 checksum validation and write-once archive mode, satisfying ALCOA+ principles for raw data handling in regulated settings.

Applications

• Pharmaceutical QC: USP dissolution medium conditioning, tablet disintegration testing, and buffer equilibration
• Biochemistry: enzyme kinetics assays requiring thermal stabilization at 37°C, 42°C, or 65°C
• Environmental analysis: BOD incubation, extraction solvent preheating (e.g., Soxhlet), and EPA Method 1664 lipid extraction
• Materials science: polymer solubilization, viscosity standardization, and thermal aging of coatings
• Academic research: cell culture media warming, PCR tube pre-equilibration, and crystallization studies under controlled thermal gradients

FAQ

What is the maximum recommended operating temperature for continuous use?
The UHP-28 is rated for sustained operation at 100°C; however, prolonged use above 95°C may accelerate evaporation and require more frequent refilling. For optimal long-term stability, we recommend maintaining setpoints ≤90°C when operating unattended.
Does the unit support external temperature probe input for sample-specific monitoring?
Yes—optional RS-485 interface allows connection to external PT100 probes placed directly in sample vessels; temperature feedback can be configured as primary control input or secondary verification channel.
Is calibration documentation provided with shipment?
Each unit ships with a factory calibration certificate traceable to NIM (National Institute of Metrology, China), covering temperature accuracy at 37°C, 60°C, and 95°C. Full ISO/IEC 17025-accredited calibration services are available upon request.
Can the UHP-28 be integrated into a central lab management system?
Via Modbus RTU protocol over RS-485, the device supports bidirectional communication with LIMS and SCADA platforms for status polling, setpoint updates, and alarm forwarding.
What maintenance intervals are recommended for optimal performance?
We advise quarterly inspection of the water level sensor, annual verification of thermal sensor drift using a calibrated reference thermometer, and biannual cleaning of the heating element surface with citric acid solution to prevent scale accumulation.