Truelab DZTW Series Benchtop Magnetic Stirring Hot Plate with Analog Temperature Display
| Brand | Truelab |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Product Origin | Domestic (China) |
| Model Range | 100 mL – 20 L capacities |
| Heating Power | 150–2500 W (model-dependent) |
| Max Operating Temperature | 200 °C |
| Temperature Uniformity | ±0.1 °C |
| Heating Surface Diameter | 100 mm |
| Heating Zone Diameter | 100 mm |
| Display Type | Analog Dial Thermometer |
Overview
The Truelab DZTW Series is a line of entry-level, analog-controlled benchtop heating plates engineered for consistent, safe, and reproducible thermal support in routine laboratory sample preparation workflows. Unlike digitally regulated hot plates or magnetic stirrer-heaters, the DZTW series employs robust resistive heating elements embedded beneath a precision-machined aluminum alloy heating surface, delivering stable conductive heat transfer to round-bottom flasks, Erlenmeyer flasks, and other standard borosilicate glass vessels. Its design follows classical thermal management principles—heat is transferred via direct conduction from the heated plate surface to the vessel base, minimizing convective losses and ensuring predictable ramp rates and plateau stability under open-air ambient conditions. Intended for non-GMP, non-regulated applications such as preliminary digestion, solvent evaporation, reagent warming, and basic reflux setups, the DZTW platform prioritizes mechanical durability, electrical safety, and operational simplicity over programmability or data logging.
Key Features
- Electro-mechanical temperature control via calibrated rotary potentiometer—enabling continuous analog adjustment across the full 0–200 °C range
- Analog dial thermometer display with high-visibility scale and ±0.1 °C uniformity across the 100 mm active heating zone
- Cold-rolled steel housing with electrostatic epoxy powder coating—providing resistance to chemical splashes, abrasion, and long-term UV-induced degradation
- Aluminum alloy heating plate with optimized thermal mass—ensuring rapid warm-up (typical t90 ≤ 8 min to 150 °C) and low thermal inertia for responsive manual regulation
- Over-temperature cut-off protection circuitry compliant with IEC 61000-4-2 (ESD immunity) and IEC 61000-4-3 (radiated RF immunity)
- UL-listed internal wiring and Class H insulation materials—rated for continuous operation at 200 °C without derating
Sample Compatibility & Compliance
The DZTW series accommodates standard laboratory glassware from 100 mL to 20 L capacity, including ASTM E2779-compliant round-bottom flasks (e.g., 24/40, 29/42, 45/50 joints), flat-bottom boiling flasks, and wide-mouth digestion vessels. The 100 mm heating diameter ensures full contact coverage for vessels up to 100 mm base diameter; larger volumes require use with compatible support stands or clamps. While not certified for use in explosion-proof environments or classified hazardous locations (per NEC Article 500), the unit meets general-purpose electrical safety requirements per GB 4706.1–2005 (equivalent to IEC 60335-1). It is suitable for ISO/IEC 17025-accredited labs performing non-critical heating steps where traceable calibration is not mandated—though optional NIST-traceable external probe verification is supported via third-party thermocouple insertion.
Software & Data Management
The DZTW series operates without embedded firmware, microprocessor control, or digital communication interfaces. As a purely analog device, it generates no electronic audit trail, does not store temperature logs, and is not compliant with FDA 21 CFR Part 11 or EU Annex 11 requirements for electronic records. This architecture eliminates cybersecurity vulnerabilities and reduces validation burden in low-risk workflows. For laboratories requiring documented thermal profiles, integration with external USB data loggers (e.g., Omega OM-DAQPRO-5300 series) is feasible using Type K thermocouples inserted through flask necks or mounted on vessel exteriors. All models ship with a factory calibration certificate indicating measured surface temperature deviation against reference RTD at three points (50 °C, 100 °C, 150 °C).
Applications
- Controlled-temperature solvent evaporation during sample concentration prior to GC or HPLC analysis
- Pre-warming of reagents and standards in environmental testing (e.g., EPA Method 3010A acid digestion prep)
- Low-intensity heating for enzymatic reactions where precise ramp control is unnecessary
- Support heating for simple distillation or steam distillation assemblies
- General-purpose benchtop warming of culture media, buffers, or calibration standards in teaching labs and QC screening environments
- Standby thermal maintenance for reaction mixtures during intermittent manual sampling
FAQ
Is the DZTW series compatible with magnetic stirring?
No—this model lacks an integrated stir motor or magnetic coupling. For combined heating and stirring, consider the Truelab DZTW-M series (separate product line).
Can the unit be used under a fume hood?
Yes—its passive cooling design and absence of forced-air components make it suitable for enclosed ventilation environments, provided minimum clearance (≥5 cm) is maintained around all sides.
What calibration documentation is included?
Each unit ships with a manufacturer’s Certificate of Conformance and a single-point verification report at 100 °C using a calibrated PT100 reference sensor.
Are replacement heating elements available?
Yes—Truelab offers field-replaceable heater modules (P/N: DZTW-HEAT-ALU-100) with standardized M4 mounting and 2-pin JST connectors for service continuity.
Does the analog display require battery or external power?
No—the dial thermometer is a purely mechanical bimetallic gauge with no electrical dependency.
