Claisse LeDoser-12 Automated Flux Dispensing Balance

Overview

The Claisse LeDoser-12 is an industrial-grade automated flux dispensing balance engineered specifically for high-throughput, reproducible sample preparation in X-ray fluorescence (XRF), atomic absorption (AA), and inductively coupled plasma (ICP) analytical workflows. Unlike conventional manual or semi-automated weighing stations, the LeDoser-12 integrates a precision analytical balance with programmable multi-step dispensing logic to deliver exact mass ratios of sample and flux—most commonly lithium tetraborate or lithium metaborate—directly into platinum crucibles. Its operation is grounded in gravimetric control: each dispensing cycle measures actual mass incrementally, compensating for bulk density variations, powder flow inconsistencies, and operator-induced variability. This eliminates reliance on pre-weighed samples and ensures stoichiometric consistency across hundreds of fusion runs per day. Designed for integration into regulated laboratory environments, the system supports audit-ready data integrity through barcode-driven sample identification, LIMS-compatible data export, and full traceability of every weighing event—including timestamps, operator IDs, target/actual masses, and error margins.

Key Features

• 12-position dispensing carousel with dual 6-position rotating wheels for efficient crucible handling and minimized cross-contamination risk
• High-resolution analytical balance with 0.0001 g readability and built-in drift compensation for stable performance under ambient lab conditions (25 °C)
• Three configurable dispensing modes: fixed-ratio (sample:flux), fixed-mass, and variable-mass—enabling flexibility across diverse matrix types and regulatory requirements
• Touchscreen HMI with multilingual interface (English, French, German, Spanish, Chinese), intuitive workflow navigation, and real-time display of all weighing parameters and deviations
• Integrated barcode reader for unambiguous sample tracking; prevents misidentification and supports GLP/GMP-compliant recordkeeping
• Automatic crucible detection and low-pressure sensing inside the furnace chamber to prevent dispensing errors during loading/unloading
• Conformal-coated PCBs for enhanced resistance to corrosive flux vapors and long-term reliability in demanding fusion labs
• One-touch operation with fully automated sliding door, eliminating manual intervention during dispensing cycles
• Onboard storage (4 GB CompactFlash) for >1,000 customizable dispensing programs, including multi-step flux addition protocols
• Optional stirring module for homogeneous melt precursor mixing prior to fusion

Sample Compatibility & Compliance

The LeDoser-12 accommodates standard 30 mL and 40 mL platinum crucibles and is compatible with all common borate-based fusion reagents—including Li₂B₄O₇, LiBO₂, and mixed eutectics—as well as alternative fluxes used in specialized geochemical or metallurgical applications. It operates within ISO/IEC 17025-accredited laboratories and meets key regulatory prerequisites: CE and CSA certification confirm electromagnetic compatibility and electrical safety; UL 94 V-0 rating guarantees flame-retardant housing; RoHS compliance ensures restricted substance control. For FDA-regulated environments, the instrument supports 21 CFR Part 11 readiness via secure user authentication (password-protected access levels), electronic signature logging, and immutable audit trails exported in CSV or XML format. All weighing events are timestamped, operator-tagged, and stored locally with optional synchronization to enterprise LIMS platforms.

Software & Data Management

The embedded firmware provides granular control over dispensing logic—including number of steps, target mass per step, tolerance thresholds (±mg), and calculation method (absolute vs. relative error). Calibration routines are accessible directly through the touchscreen interface and can be scheduled or triggered manually. Two USB ports enable firmware updates, program backup, and direct data transfer to external drives. The system exports structured datasets containing sample ID, crucible position, nominal/actual masses, deviation %, operator code, and completion timestamp—compatible with major LIMS vendors (e.g., LabWare, Thermo Fisher SampleManager, Agilent OpenLab). Optional software modules support statistical process monitoring (SPC), trend analysis of dispensing repeatability, and automated report generation aligned with ISO 80000 or ASTM E177 standards.

Applications

The LeDoser-12 is deployed globally in cement, mining, environmental, and metallurgical laboratories where XRF fusion bead quality directly impacts quantitative accuracy. It enables robust preparation of silicate rocks, ores, slags, ceramics, and fly ash—materials prone to heterogeneity and moisture sensitivity. By removing manual weighing variability, it improves inter-operator reproducibility (RSD < 0.3% for 100 mg flux additions) and reduces total sample turnaround time by up to 90% versus conventional methods. Its throughput of 40–100 samples/hour supports both routine QC and high-volume exploration campaigns. The system also serves as a critical pre-fusion checkpoint in method validation studies requiring strict adherence to USP <731>, ISO 12847, or ASTM C114 protocols.

FAQ

Does the LeDoser-12 require pre-weighed samples?

No. It accepts roughly measured or scooped samples and determines exact mass in situ during dispensing.
Can it handle multiple flux types in one run?

Yes—via programmable multi-step dispensing with independent mass targets and tolerances for each flux component.
Is calibration traceable to national standards?

Yes. Internal calibration uses certified weights traceable to NIST or equivalent national metrology institutes.
What maintenance is required?

Annual verification of balance performance and crucible wheel alignment; no routine consumables beyond standard platinum crucibles.
How does it integrate with existing fusion furnaces?

It outputs ready-loaded crucibles compatible with Claisse Fusion Machine series (e.g., Fluxy, PrepX) and third-party furnaces using standardized crucible dimensions.