885 Compact Oven Sample Changer

Significance of the Topic

Moisture determination is critical in quality control and research across pharmaceuticals, food, chemicals and environmental analysis. The 885 Compact Oven Sample Changer enhances Karl Fischer titration by enabling thermal sample preparation, improving automation, precision and throughput.

Objectives and Overview of the Document

This document defines the standard scope of delivery and optional accessories for the Metrohm 885 Compact Oven Sample Changer. It serves as a reference for ordering, installing and configuring all components needed for reliable moisture analysis.

Used Instrumentation

• 885 Compact Oven Sample Changer: Oven module heating samples to 250 °C for moisture evaporation and transfer into the KF titration cell.
• Heating tube stopper: Sealed connection for coulometric Karl Fischer vessels and heatable tubing.
• Screw caps with septa (100 pcs): Compatible with 8 mL sample glasses for secure, inert sample capping.
• Drying flask cap and bottle (2 × 100 mL): GL45 threaded assembly for moisture trap and carrier gas drying.
• FEP tubing (13 cm, 25 cm, 60 cm) with light and kink protection: Gas transfer lines.
• Thread and tubing adapters (M6–M8): Interface between oven, tubing and instruments.
• Filter tube: Retains particulates when using drying bottles or Rancimats.
• Heating tubing: For integration with KF Thermoprep, 885 and 874 ovens.
• Holding clips and needle holders: Secure reagent bottles and septum piercing needles during operation.
• USB Mini OTG–A adapter: Digital communication with USB-based titration instruments.
• Sample glasses (8 mL, 100 pcs): Glass vials for sample introduction.
• Hexagon key, wrench and dust filter: Tools and accessories for assembly and maintenance.
• Molecular sieve (250 g, 0.3 nm pores): Desiccant for gas drying.
• Septum piercing and outlet needles: Injection and gas outlet components for ovens and Thermoprep.

Main Features and Discussion

The 885 Compact Oven Sample Changer integrates an electrically heated oven with a programmable sample carousel. Samples are placed in threaded glass vials sealed by septa and processed sequentially. Moisture evaporated at high temperature is swept by a dry carrier gas through FEP tubing into the titration cell for coulometric determination. Adapters and connectors ensure leak-free operation. Filter tubes and drying bottles protect sensitive detectors from particulates and residual moisture.

Benefits and Practical Applications

• Fully automated operation reduces manual handling and operator error.
• High throughput suits routine QC laboratories.
• Temperature control up to 250 °C allows analysis of low-volatility and high-boiling samples.
• Modular accessories enable customization for specific sample matrices.
• Compatibility with Metrohm KF Thermoprep and Oven Sample Processor series.

Future Trends and Potential Applications

Advances may include wireless temperature and gas-flow monitoring, integration with laboratory information management systems (LIMS), miniaturized ovens for microscale samples, and AI-driven method optimization to further enhance speed and reproducibility.

Conclusion

The 885 Compact Oven Sample Changer and its comprehensive accessory set provide a robust solution for automated moisture analysis by Karl Fischer titration. Its modular design and high-temperature capability support diverse sample types, boosting laboratory efficiency and data quality.

Reference

No external literature references were provided in the original document.