Hengping MTC-24P Electric Hotplate Digestion System
| Brand | Hengping |
|---|---|
| Origin | Shanghai, China |
| Model | MTC-24P |
| Heating Power | 2300 W |
| Max. Operating Temperature | 250 °C |
| Temperature Uniformity | ±0.1 °C |
| Plate Dimensions | 405 × 405 × 275 mm |
| Heating Zone | 375 × 375 mm |
| Temperature Display Range | RT to 250 °C |
Overview
The Hengping MTC-24P Electric Hotplate Digestion System is a precision-controlled laboratory heating platform engineered for standardized acid digestion, sample evaporation, and solvent removal in analytical sample preparation workflows. Designed specifically for trace-metal analysis (e.g., ICP-MS, ICP-OES, AAS), the system operates on resistive heating with digital PID temperature regulation—ensuring stable thermal output across the entire ceramic-coated aluminum heating surface. Unlike open-flame or generic hotplates, the MTC-24P integrates a calibrated, high-resolution temperature feedback loop that maintains setpoint accuracy within ±0.1 °C under load, minimizing thermal gradient-induced variability in digestion kinetics. Its 375 × 375 mm uniform heating zone accommodates up to 24 standard PTFE or quartz digestion vessels (e.g., 50 mL Teflon®-lined microwave tubes or borosilicate glass beakers), supporting batch processing compliant with EPA Method 3050B, ISO 11466, and ASTM D5172 protocols.
Key Features
- 2300 W high-power heating element with rapid thermal response and sustained stability at 250 °C
- Ceramic-reinforced aluminum plate surface offering chemical resistance to concentrated HNO₃, HCl, HF, and aqua regia vapors
- Digital PID controller with real-time temperature monitoring and auto-tuning capability
- Front-panel LED display showing actual and setpoint temperatures from ambient to 250 °C in 0.1 °C increments
- Over-temperature protection circuit with independent safety cutoff at 260 °C
- Low-profile, ergonomically angled control interface for glove-compatible operation in fume hoods
- Integrated leveling feet and non-slip silicone base for vibration-dampened placement on analytical benches
Sample Compatibility & Compliance
The MTC-24P supports a wide range of digestion vessel materials—including PTFE, quartz, borosilicate glass, and high-purity graphite—without risk of metal leaching or thermal shock failure. Its uniform heating profile meets the spatial temperature consistency requirements defined in USP , CLSI EP23-A, and ISO/IEC 17025–accredited laboratories for method validation. When operated with trace-metal-clean reagents and Class 100 laminar flow hood protocols, the system enables reproducible recovery rates ≥98.5% for Cd, Pb, As, and Cr(VI) in certified reference materials (e.g., NIST SRM 2711a, GBW 07605). The unit complies with IEC 61010-1:2010 safety standards for laboratory electrical equipment and carries CE marking for EMC and low-voltage directive conformity.
Software & Data Management
While the MTC-24P operates as a standalone hardware platform, its analog voltage output (0–5 V DC) is compatible with optional data loggers (e.g., Omega OM-DAQPRO-5300) for time-stamped temperature recording. For GLP/GMP environments requiring audit trails, integration with LabArchives ELN or Thermo Fisher SampleManager LIMS is supported via RS-232 or USB-to-serial adapters. All temperature setpoints, dwell times, and ramp profiles can be manually documented per FDA 21 CFR Part 11 Annex 11 guidelines when paired with validated electronic notebooks. No proprietary software is bundled; configuration remains fully operator-defined without firmware lock-in.
Applications
- Open-vessel acid digestion of soils, sediments, and biological tissues prior to elemental analysis
- Controlled evaporation of digests to near-dryness for matrix simplification in multi-element ICP workflows
- Pre-concentration of aqueous environmental samples (e.g., wastewater, rainwater) for anion/cation speciation
- Heating step in EPA SW-846 Methods 3015A (microwave-assisted digestion follow-up) and 3051A (open-vessel reflux)
- Calibration standard preparation requiring precise thermal stabilization of stock solutions
- QC/QA verification of digestion efficiency using spiked recovery experiments
FAQ
What is the difference between the MTC-24 and MTC-24P models?
The MTC-24P includes programmable ramp-hold functionality and a higher-resolution temperature sensor (±0.05 °C typical), whereas the MTC-24 offers fixed-setpoint operation only.
Can the MTC-24P be used with hydrofluoric acid (HF)?
Yes—provided vessels are made of HF-resistant materials (e.g., PFA or quartz) and the plate surface is cleaned immediately after use with deionized water and ethanol to prevent ceramic coating degradation.
Is temperature calibration traceable to NIST standards?
The unit ships with a factory calibration certificate; field recalibration using a NIST-traceable RTD probe (e.g., Fluke 724) is supported via the rear-panel calibration port.
Does it support remote monitoring via Ethernet or Wi-Fi?
No native network interface is included; however, third-party industrial IoT gateways (e.g., Advantech ECU-1251) can bridge the analog output for cloud-based dashboards.
What maintenance is required for long-term accuracy?
Annual verification of thermal uniformity using a 9-point grid thermocouple array and visual inspection of ceramic surface integrity are recommended per ISO/IEC 17025 Clause 6.4.6.
