Leici DX-02 Multi-Parameter Digestion Block

Overview

The Leici DX-02 Multi-Parameter Digestion Block is a compact, benchtop-compatible digestion system engineered for standardized wet-chemical pretreatment of water and wastewater samples prior to spectrophotometric or instrumental analysis (e.g., COD, TP, TN, heavy metals). It operates on the principle of sealed micro-reflux digestion—eliminating the need for external condensers or circulating cooling water—thereby reducing laboratory footprint, operational complexity, and risk of reagent loss or vapor exposure. Designed in accordance with core principles of ISO 6060 (COD determination), ASTM D1252 (Chemical Oxygen Demand), and Chinese EPA standard HJ 828–2017, the DX-02 ensures method-compliant thermal decomposition under controlled, reproducible conditions. Its dual independent heating zones allow simultaneous execution of two distinct digestion protocols—such as low-temperature phosphorus digestion (120 °C) and high-temperature COD oxidation (165 °C)—without cross-zone interference, supporting multi-analyte workflows in environmental testing labs operating under GLP or routine monitoring regimes.

Key Features

• Dual-zone independent temperature control with real-time digital display and ±0.1 °C regulation stability, enabling parallel digestion of heterogeneous sample sets.
• 32-position digestion block accommodating standard φ16 mm borosilicate glass tubes—compatible with common pre-filled digestion vials used in EPA and HJ-certified test kits.
• Eight preloaded digestion methods compliant with national and industry standards (e.g., HJ 399–2007 for COD, HJ 671–2013 for total phosphorus), plus ten user-definable protocol slots with full parameter logging (temperature setpoint, ramp rate, hold time, heating mode).
• Configurable heating modes: continuous heating for rapid thermal equilibration; intermittent (pulse) heating to minimize energy consumption and extend heater lifespan during extended low-temperature protocols.
• Integrated safety architecture including over-temperature cutoff (auto-shutdown at ≥190 °C), transparent polycarbonate safety shield, audible end-of-digestion alarm, visual status LEDs, and countdown timer with minute-second resolution.
• High-resolution color TFT touchscreen interface with intuitive icon-based navigation, multilingual support (English/Chinese), and non-volatile memory retention—even after power interruption.

Sample Compatibility & Compliance

The DX-02 is validated for use with aqueous matrices including surface water, groundwater, domestic sewage, industrial effluents, and leachates. It accommodates standard 16-mm digestion tubes containing up to 10 mL of sample-reagent mixture (e.g., K₂Cr₂O₇–H₂SO₄ for COD, ammonium molybdate–ascorbic acid for orthophosphate). All thermal profiles meet traceability requirements for ISO/IEC 17025-accredited laboratories: temperature uniformity across the block (≤2 °C deviation at 165 °C) and time accuracy (±2% of programmed duration) are verified per internal calibration procedure aligned with JJG 874–2007 (National Metrological Verification Regulation for Laboratory Heating Devices). The unit bears CE marking for EMC and LVD compliance and conforms to IEC 61010-1:2010 safety requirements for electrical equipment used in measurement, control, and laboratory applications.

Software & Data Management

While the DX-02 operates as a standalone instrument, its embedded firmware supports full audit trail functionality: each digestion run logs timestamp, operator ID (via optional PIN entry), selected method, actual temperature/time profile, and final status (completed, aborted, or fault-triggered). Logs are exportable via USB flash drive in CSV format for integration into LIMS or QA documentation systems. Firmware updates are delivered via secure USB-based patching, ensuring continued alignment with evolving regulatory expectations—including data integrity provisions analogous to FDA 21 CFR Part 11 for electronic records (though the device itself does not require formal Part 11 validation due to its non-data-generating role in final quantification). No cloud connectivity or remote access capabilities are implemented, preserving network security in regulated lab environments.

Applications

• Routine COD analysis in municipal wastewater treatment plants and environmental monitoring stations.
• Total phosphorus and total nitrogen digestion prior to UV-Vis or ICP-OES quantification.
• Heavy metal digestion (e.g., Cr, Ni, Cu) in compliance with HJ 485–2009 and HJ 487–2009.
• Method development and validation studies requiring precise thermal ramping and dwell control.
• Field-deployable lab support: lightweight (5 kg) and universal-input power design enable operation from generators or lab-grade inverters in mobile environmental labs.

FAQ

Does the DX-02 meet international standards for COD digestion?
Yes—it implements sealed micro-reflux conditions and temperature profiles consistent with ISO 6060, ASTM D1252, and HJ 828–2017, with documented uniformity and accuracy within specified tolerances.
Can digestion methods be exported or backed up externally?
Yes—user-defined methods and run logs are exportable in CSV format via USB interface for archival or QA review.
Is the unit suitable for GMP-regulated pharmaceutical wastewater testing?
It may be deployed in such settings as a sample preparation tool, provided it is included in the lab’s equipment qualification (IQ/OQ/PQ) protocol and operated under documented SOPs referencing its calibration and maintenance history.
What maintenance is required to ensure long-term temperature accuracy?
Annual verification using NIST-traceable PT100 probe is recommended; heater elements and thermal sensors are field-replaceable with factory-specified parts.
Does the device support external triggering or integration with spectrophotometers?
No—the DX-02 is a dedicated digestion module without API, RS-232, or Ethernet interfaces; integration is manual via standardized tube handling protocols.