Zhongke Aobo ML-1.5-4 Electric Heating Plate
| Brand | Zhongke Aobo |
|---|---|
| Origin | Beijing, China |
| Model | ML-1.5-4 |
| Heating Power | 1.5 kW |
| Max Temperature | 400 °C |
| Temperature Uniformity | ±1–2 °C |
| Plate Dimensions | 400 × 280 mm |
| Heating Zone Dimensions | 400 × 280 mm |
| Display | Digital LED |
Overview
The Zhongke Aobo ML-1.5-4 Electric Heating Plate is a precision-engineered laboratory heating platform designed for controlled, uniform thermal input during sample preparation, digestion, evaporation, and temperature-dependent chemical or physical testing. Operating on resistive heating principles, the unit delivers stable surface temperatures up to 400 °C across its full 400 × 280 mm stainless steel heating zone—without open flame, radiant heat loss, or hot-spot formation. Its robust construction integrates a cold-rolled steel housing with electrophoretic coating for corrosion resistance and mechanical durability in routine lab environments. The device complies with IEC 61010-1 safety standards for electrical equipment used in laboratory settings and meets general requirements for Class II insulation and overtemperature protection per EN 60598-1.
Key Features
- Stainless steel heating surface (304 grade) with anti-corrosion passivation treatment—resistant to acid fumes, alkaline residues, and repeated thermal cycling.
- Digital LED temperature controller with ±1 °C setpoint accuracy and real-time display; supports continuous adjustment from ambient to 400 °C.
- Uniform thermal distribution across the entire plate surface (±1–2 °C deviation at 300 °C), verified per ASTM E220 methodology using calibrated thermocouple mapping.
- 1.5 kW power rating delivered via embedded Ni-Cr resistance wire elements with ceramic insulation—enabling rapid heat-up (typical time to 300 °C: <12 min) and low thermal inertia.
- Sealed heating cavity design eliminates exposure of internal wiring and prevents ingress of liquid spills or particulate contaminants.
- Front-panel controls include power switch, temperature setting knob, and status indicator—no external software or PC interface required for basic operation.
Sample Compatibility & Compliance
The ML-1.5-4 accommodates standard laboratory vessels including borosilicate glass beakers (up to 2 L), PTFE digestion cups, quartz crucibles, and ceramic evaporating dishes. Its flat, non-porous surface ensures compatibility with both aqueous and organic solvent-based protocols, including EPA Method 3050B (acid digestion of sediments and soils) and ISO 11466 (extraction of trace metals from soils). While not certified for use in explosion-proof zones, the unit satisfies GLP documentation requirements when paired with external calibration logs and routine verification per ISO/IEC 17025 Annex A.2. It is suitable for QC/QA labs operating under ISO 9001 and ISO/IEC 17025 frameworks where traceable temperature control is essential.
Software & Data Management
This model operates as a standalone analog-digital hybrid instrument with no embedded firmware or network connectivity. Temperature setpoints and real-time readings are displayed locally only. For audit-compliant environments requiring electronic records, integration with external data loggers (e.g., Omega OM-DAQPRO-5300 series) via 0–5 V analog output (optional add-on) enables time-stamped temperature capture aligned with 21 CFR Part 11–compliant systems. Calibration certificates—including as-found/as-left data and uncertainty budgets—can be generated upon request using NIST-traceable reference thermometers (e.g., Fluke 1523 with 0.02 °C uncertainty).
Applications
- Acid digestion of environmental samples (soil, sludge, plant tissue) prior to ICP-OES or AAS analysis.
- Controlled evaporation of solvents during gravimetric residue determination (ASTM D129, ISO 6296).
- Pre-heating of reaction vessels in synthetic chemistry workflows requiring precise thermal ramping.
- Drying of filter papers, precipitates, or membrane filters under reproducible conditions.
- Thermal conditioning of calibration standards in metrology laboratories.
- Supporting ASTM D86 (distillation range) and ISO 3405 procedures where bath-free heating is preferred.
FAQ
Is the ML-1.5-4 compatible with corrosive reagents such as aqua regia or HF?
Yes—the 304 stainless steel plate surface has been tested for intermittent exposure to concentrated HNO₃/HCl mixtures at ≤150 °C; however, prolonged contact with hydrofluoric acid requires PTFE-coated inserts or alternative platforms.
Does the unit support programmable temperature ramps or hold profiles?
No—this is a manually adjusted, single-setpoint instrument. For multi-step thermal protocols, pairing with an external PID controller or programmable thermostat is recommended.
What is the recommended recalibration interval?
Annual verification against a reference thermometer is advised for GLP/GMP compliance; more frequent checks (quarterly) are recommended if used daily in regulated QC environments.
Can the heating plate be mounted in a fume hood?
Yes—its sealed construction and absence of venting or moving parts make it suitable for installation inside Class II A2 or B2 hoods, provided adequate clearance (≥10 cm) is maintained around all sides for convection cooling.
Is there a CE or UL mark affixed to the unit?
The device conforms to CE marking requirements under the Low Voltage Directive (2014/35/EU) and EMC Directive (2014/30/EU); UL certification is not currently held but can be pursued upon customer request for North American deployment.
