JRY JRY-500-36XZ Graphite Block Digestion System for Kjeldahl Nitrogen Analysis
| Brand | JRY |
|---|---|
| Origin | Hunan, China |
| Manufacturer Type | Direct Manufacturer |
| Region Category | Domestic (China) |
| Model | JRY-500-36XZ |
| Price | USD 2,800 (approx.) |
Overview
The JRY JRY-500-36XZ Graphite Block Digestion System is a programmable, high-temperature thermal digestion platform engineered for reproducible and complete sample mineralization in Kjeldahl nitrogen analysis workflows. It operates on the principle of conductive heating via a precisely machined, corrosion-resistant graphite block—providing uniform thermal distribution across all 36 digestion positions. Unlike open-flame or ceramic-heater-based systems, this instrument delivers stable, gradient-free temperature profiles (up to 450 °C) essential for consistent sulfuric acid–catalyzed decomposition of organic matrices. Designed specifically for Kjeldahl digestion tubes (e.g., 100–500 mL borosilicate glass digesters), it supports both classical macro- and micro-Kjeldahl protocols per ISO 8968, AOAC 984.13, and USP , and serves as a validated post-microwave acid removal (‘acid evaporation’ or ‘gassing-off’) station where residual H2SO4 must be carefully driven off prior to distillation.
Key Features
- Radiation-free, uniform conductive heating: Precision-machined graphite block ensures ±1.5 °C temperature homogeneity across all 36 positions at setpoints from ambient to 450 °C—critical for inter-sample comparability in regulatory testing.
- High-thermal-capacity architecture: Optimized thermal mass minimizes overshoot during ramping and sustains stable plateau temperatures even under full-load conditions with concentrated H2SO4.
- Programmable digital controller: Dual-display PID interface with independent time/temperature programming; optional external timer module enables unattended multi-step digestion sequences (e.g., ramp-hold-cool cycles).
- Chemical-resistant construction: Graphite surface coated with PTFE–silicone composite; stainless-steel housing with acid-resistant powder coating; compatible with boiling H2SO4, HNO3, HClO4, and mixed-acid systems used in protein, soil, feed, and wastewater analysis.
- Ergonomic and safety-integrated design: Integrated fume extraction collar (compatible with standard lab ducting), over-temperature cut-off, and auto-shutdown on lid removal—meeting IEC 61010-1 requirements for laboratory electrical equipment safety.
Sample Compatibility & Compliance
The JRY-500-36XZ accommodates standard Kjeldahl digestion tubes (100 mL, 250 mL, 300 mL, and 500 mL capacities) made from low-extractable borosilicate glass (e.g., DIN 12331-compliant). It is routinely deployed in laboratories performing routine protein quantification (AOAC 981.10, ISO 20483), total nitrogen in environmental samples (EPA 350.1, ISO 11261), and heavy metal pre-digestion prior to ICP-OES/MS (EPA 3050B, ISO 11466). The system supports GLP-compliant operation when paired with audit-trail-capable data loggers and meets mechanical safety requirements under EN 61000-6-3 (EMC) and EN 61000-6-2 (immunity).
Software & Data Management
While the base unit features an embedded microprocessor with non-volatile memory for storing up to 10 user-defined methods, optional RS-485 or USB-to-serial interfaces enable integration with LIMS or custom SCADA platforms. When connected to JRY’s optional DigControl™ software (v3.2+), users gain real-time temperature logging, method versioning, electronic signature support, and 21 CFR Part 11–compliant audit trails—including operator ID, parameter changes, and run completion timestamps. All firmware updates are delivered via signed HEX packages verified against SHA-256 checksums.
Applications
- Protein determination in dairy, meat, cereal, and plant-based foods per AOAC and Codex Alimentarius standards
- Total Kjeldahl nitrogen (TKN) in municipal wastewater, sludge, and agricultural runoff
- Nitrogen speciation in fertilizers and soil amendments (ISO 13878)
- Acid digestion of biological tissues (liver, muscle, blood) prior to amino acid or elemental analysis
- Post-microwave acid removal for samples processed in closed-vessel systems (e.g., CEM MARS 6, Anton Paar Multiwave PRO)
- Preparation of certified reference materials (CRMs) requiring trace-metal-clean digestion conditions
FAQ
What tube sizes are supported?
Standard Kjeldahl tubes ranging from 100 mL to 500 mL (outer diameter ≤ 60 mm); custom inserts available for tapered or non-standard geometries.
Is the system compatible with perchloric acid digestion?
Yes—when used with appropriate fume hood certification, explosion-proof ventilation, and strict adherence to ASTM D5191 guidelines for perchloric acid handling.
Can digestion methods be exported or backed up?
Yes—via DigControl™ software, methods and historical logs can be archived in CSV or PDF format with embedded digital signatures.
Does the unit meet CE or UKCA marking requirements?
The JRY-500-36XZ complies with the essential health and safety requirements of the EU Machinery Directive 2006/42/EC and Electromagnetic Compatibility Directive 2014/30/EU; CE marking is applied following third-party notified body assessment (TÜV Rheinland Certificate No. R 50521254 0001).
What maintenance is required for long-term accuracy?
Annual calibration verification using NIST-traceable PT100 probes; graphite block surface inspection for pitting or carbon loss every 6 months in high-acid-use environments.
