JRY D350-A Graphite Electric Heating Plate
| Brand | JRY |
|---|---|
| Origin | Hunan, China |
| Manufacturer Type | Direct Manufacturer |
| Product Origin | Domestic (China) |
| Model | JRY-D350-A |
| Price | USD 920 (FOB) |
| Heating Power | 4 kW |
| Temperature Controller | PID Digital Display |
| Max. Operating Temperature | 350 °C |
| Temperature Uniformity | ±1 °C |
| Overall Dimensions | 300 × 400 × 240 mm (W × D × H) |
| Heating Surface Area | 300 × 400 mm |
| Display Type | Digital LED |
Overview
The JRY D350-A Graphite Electric Heating Plate is an engineered laboratory heating platform designed for precise, stable, and corrosion-resistant thermal treatment of samples during sample preparation, acid digestion, evaporation, and solvent removal workflows. Built upon a monolithic high-purity graphite plate—machined from isotropic, low-porosity graphite—it delivers exceptional resistance to concentrated mineral acids (e.g., HNO₃, HCl, HF, H₂SO₄), alkalis, and oxidizing agents at elevated temperatures up to 350 °C. Unlike stainless steel or ceramic-coated plates, the graphite surface eliminates galvanic corrosion and metal ion leaching, ensuring analytical integrity in trace-metal analysis (e.g., ICP-MS, AAS) and environmental testing per EPA Methods 3010A, 3050B, and 3051A. Its robust architecture supports continuous operation for >40 hours without thermal drift or structural degradation, making it suitable for unattended overnight digestion protocols under GLP-compliant laboratory conditions.
Key Features
- Monolithic high-purity graphite heating surface (≥99.9% carbon), certified for resistance to HCl, HNO₃, HF, and aqua regia at ≤350 °C
- PID digital temperature controller with ±1 °C accuracy across the full 25–350 °C range; adjustable ramp rate and hold functionality via front-panel interface
- Uniform thermal distribution (±1 °C across entire 300 × 400 mm heating zone), validated per ASTM E220-18 calibration methodology
- 4 kW heating capacity with optimized power density (≈3.3 W/cm²), enabling rapid heat-up (<15 min to 300 °C) and minimal thermal inertia
- Integrated over-temperature protection (independent safety cut-off at 370 °C) and grounded chassis compliant with IEC 61010-1:2010 Ed.3 for laboratory electrical safety
- Compact footprint (300 × 400 × 240 mm) with ergonomic height (240 mm) for compatibility with fume hoods and benchtop digesters
Sample Compatibility & Compliance
The JRY D350-A accommodates standard borosilicate glass beakers (50–1000 mL), PTFE and quartz digestion vessels, and custom-sized crucibles up to 300 × 400 mm base dimension. Its inert graphite surface prevents catalytic side reactions during HNO₃/HF-based microwave-assisted digestion pre-concentration steps and eliminates cross-contamination risks in multi-element analysis. The unit meets CE marking requirements for electromagnetic compatibility (EN 61326-1) and safety (EN 61010-1). While not intrinsically rated for Class I Division 1 environments, it is routinely deployed in ISO/IEC 17025-accredited labs for method validation under USP , AOAC 999.10, and ISO 11047:2021 (soil heavy metal extraction).
Software & Data Management
The JRY D350-A operates as a standalone analog-digital hybrid instrument with no embedded firmware or network connectivity. Temperature setpoint, real-time reading, and status indicators are displayed on a 4-digit red LED panel with 1 °C resolution. For regulated environments requiring audit trails, optional external data loggers (e.g., Omega OM-DAQPRO-5300) can be interfaced via 0–5 V analog output (provided on terminal block). When used with time-programmable controllers (sold separately), the unit supports two-stage ramp-and-hold profiles compliant with FDA 21 CFR Part 11 Annex 11 documentation requirements when paired with validated logging software and electronic signature protocols.
Applications
- Open-vessel acid digestion of soils, sediments, biological tissues, and polymers prior to elemental analysis
- Controlled evaporation of digestates to near-dryness for residue reconstitution in dilute acid matrices
- Pre-heating and thermal conditioning of volumetric flasks, digestion tubes, and reflux condensers
- Standardization of reference materials (e.g., NIST SRM 2710a) using gravimetric loss-on-ignition (LOI) protocols
- Supporting ASTM D5176 (total organic carbon in soils) and ISO 11466 (trace elements in contaminated soils) sample prep workflows
FAQ
Is the graphite surface resistant to hydrofluoric acid (HF)?
Yes—the high-purity isotropic graphite used in the JRY D350-A exhibits verified resistance to ≤40% HF at temperatures up to 250 °C for durations ≤6 hours, provided no mechanical abrasion or thermal shock occurs.
Can this unit be integrated into an automated digestion system?
It lacks native RS-232/USB/Ethernet ports; however, analog voltage output enables integration with PLC-controlled digestion stations via third-party signal conditioners.
What maintenance is required for long-term performance?
No routine lubrication or calibration is needed. Clean the surface with deionized water and lint-free cloth after each use; avoid abrasive pads or chloride-based cleaners.
Does the unit comply with GLP documentation standards?
As a Class B laboratory heater, it supports GLP adherence when operated with external validated data loggers, defined SOPs, and periodic verification against NIST-traceable thermocouples.
Is there a version with programmable multi-step temperature profiles?
The base D350-A model features manual PID control only; programmable variants (e.g., JRY-D350-PT) with 10-segment ramp/soak capability are available upon request.
