DB-3B Stainless Steel Digital Temperature-Controlled Electric Heating Plate

Overview

The DB-3B Stainless Steel Digital Temperature-Controlled Electric Heating Plate is a robust, benchtop thermal platform engineered for consistent, repeatable heating in sample preparation, open-vessel digestion, solvent evaporation, and reagent warming workflows. It operates on resistive heating principles, utilizing a high-density embedded heating element beneath a seamless 304 stainless steel work surface—designed for chemical resistance, mechanical durability, and ease of decontamination. Unlike hot plates with analog dials or basic bimetal thermostats, the DB-3B integrates a Pt100 resistance temperature detector (RTD) paired with proportional-integral (PI) digital temperature control, enabling stable setpoint maintenance across its full ambient-to-300 °C range. Its architecture meets fundamental safety and operational requirements for ISO/IEC 17025-accredited laboratories performing non-critical thermal conditioning steps prior to analysis by ICP-OES, AAS, or titration.

Key Features

• 304 stainless steel top plate—non-porous, corrosion-resistant, and compatible with common acids (e.g., HNO₃, HCl) used in EPA Method 3050B and ASTM D5681 sample digestion protocols
• Digital LED display with real-time temperature readout and intuitive up/down keypad interface for precise setpoint entry (1 °C resolution)
• 1500 W heating capacity delivering rapid thermal response—reaches 150 °C in ≤12 minutes under no-load conditions
• Over-temperature safety cutoff at 320 °C prevents thermal runaway during unattended operation or sensor failure
• Stable thermal uniformity: ±5 °C across the central 80% of the 400 × 300 mm working area (verified per ASTM E220 calibration practice)
• Low electromagnetic interference design—suitable for proximity to sensitive instrumentation including pH meters and balances

Sample Compatibility & Compliance

The DB-3B accommodates standard laboratory glassware (e.g., 50–1000 mL beakers, Erlenmeyer flasks, digestion tubes) and PTFE or quartz vessels used in trace-metal analysis. Its flat, non-magnetic surface ensures compatibility with magnetic stirrers placed beneath the plate (stirring not integrated). While not certified for GLP/GMP production environments, the unit supports documented method execution under ISO 17025 Clause 6.4.3 (equipment verification) when accompanied by routine thermometric validation using NIST-traceable reference thermometers. It complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and carries CE marking per EU Low Voltage Directive.

Software & Data Management

The DB-3B is a standalone, microprocessor-controlled instrument without USB, Bluetooth, or network connectivity. All operational parameters—including setpoint, actual temperature, and elapsed heating time—are displayed locally via the integrated LED screen. For auditability in regulated settings, users are advised to record setpoints and observed temperatures manually in lab notebooks or electronic lab notebooks (ELNs) compliant with FDA 21 CFR Part 11. Optional external data loggers (e.g., Omega OM-DAQPRO-5300) may be interfaced via analog voltage output (0–5 V) for continuous temperature trending and QC documentation.

Applications

• Open-beaker acid digestion of environmental soils and sediments per EPA SW-846 Method 3050B
• Controlled evaporation of organic solvents (e.g., acetone, hexane) prior to gravimetric analysis
• Pre-heating of buffers, standards, and calibration solutions in clinical chemistry and microbiology labs
• Thermal conditioning of polymer samples prior to melt flow index testing (ASTM D1238)
• Supporting role in Karl Fischer titration sample preparation where controlled drying is required
• Routine warming of culture media and reagents in teaching and QA/QC laboratories

FAQ

Does the DB-3B include a built-in stirrer?
No. It is a heating-only platform. Magnetic stirring requires an external stirrer placed beneath or adjacent to the plate.
Is the temperature calibration traceable to national standards?
The unit itself is not supplied with a calibration certificate. Users must perform periodic verification using a NIST-traceable thermometer per their internal SOPs.
Can it be used under a fume hood?
Yes—its low-profile design (75 mm height) and absence of moving parts make it suitable for installation inside standard fume hoods; ensure adequate clearance around vents.
What is the expected service life under continuous use?
With proper ventilation and avoidance of thermal shock (e.g., placing cold glassware directly on a 300 °C surface), the heating element and controller typically exceed 10,000 hours of operational life.
Is replacement of the RTD sensor possible in-field?
The Pt100 sensor is factory-integrated and not user-replaceable; service requires return to authorized distributor for recalibration or component-level repair.