Metrohm 814 Automatic Sample Processor

Overview

The Metrohm 814 Automatic Sample Processor is an OEM-engineered electrochemical sample handling module designed for integration into standardized potentiometric, coulometric, and volumetric titration workflows. It operates as a dedicated peripheral unit under the real-time command of a Metrohm Titrando series titrator—serving as the mechanical execution layer for sample sequencing, reagent delivery, electrode positioning, and endpoint-triggered liquid transfer. Its architecture follows the Couette-flow-compatible design principles common to high-reproducibility electrochemical automation systems, ensuring minimal carryover (<0.01% v/v) and positional repeatability within ±0.1 mm across all axes. The system is not a standalone analyzer but a precision motion and fluidics controller optimized for compliance-driven environments where traceability, method integrity, and audit-ready operation are mandatory.

Key Features

• Optical tray recognition system enabling automatic detection of interchangeable sample carriers—supporting standardized 75 mL glass or polymer vials as well as custom-format racks (e.g., 100 mL conical, 250 mL wide-mouth).
• Single-tower mechanical platform with modular pump configuration: users may install one or two peristaltic pumps (Metrohm Type 801/802) for independent reagent/solvent delivery or dual-channel KF electrolyte management.
• Movable arm with programmable horizontal stroke (±120 mm from centerline) and vertical lift (0–150 mm), configurable for left- or right-handed laboratory bench layouts without hardware modification.
• Dedicated external titration position for offline electrode conditioning, rinsing, or auxiliary measurement—fully synchronized with Titrando’s sequence logic via MSB protocol.
• Native support for coulometric Karl Fischer water determination: integrated current-source triggering, bipotentiostatic control handshake, and drift-compensated endpoint calculation—all coordinated through host firmware.
• Method memory architecture compliant with GLP requirements: each of the 999 stored methods includes immutable timestamps, operator ID binding (via Titrando login), and full step-level audit trail exportable in CSV or XML.

Sample Compatibility & Compliance

The 814 accommodates standard laboratory containers ranging from 75 mL to 250 mL nominal volume, including DIN 12500-compliant borosilicate glass vials, polypropylene screw-cap tubes, and ASTM D6304-specified KF sample vessels. All wetted materials conform to USP Class VI biocompatibility standards; pump tubing is platinum-cured silicone (FDA 21 CFR 177.2300 compliant). The device meets IEC 61326-1 (EMC) and IEC 61010-1 (safety) requirements for laboratory electrical equipment. When operated under a validated Titrando host running Metrohm MagIC Net™ software, the full system satisfies FDA 21 CFR Part 11 electronic record/signature requirements—including role-based access control, electronic signatures, and immutable audit logs covering method execution, parameter changes, and calibration events.

Software & Data Management

Control and configuration occur exclusively through Metrohm MagIC Net™ (v3.3 or later) running on the connected Titrando instrument. The 814 appears as a native hardware node in the device tree—enabling drag-and-drop method assignment, real-time status monitoring (pump RPM, arm position, tray ID), and error-code diagnostics mapped to ISO/IEC 17025 root-cause categories. All method definitions—including step-level dwell times, aspiration volumes, rinse cycles, and conditional branching—are stored in encrypted binary format on the Titrando’s internal SSD. Raw positional and fluidics event logs are timestamped at 10 ms resolution and exportable alongside titration curves for full forensic reconstruction during regulatory review.

Applications

• High-throughput coulometric Karl Fischer water analysis in pharmaceutical excipients (per USP and Ph. Eur. 2.5.12).
• Sequential acid-base, redox, and complexometric titrations across QC labs handling raw materials, intermediates, and finished dosage forms.
• Automated electrode cleaning and reference junction maintenance prior to pH or ion-selective electrode measurements.
• Multi-step sample pretreatment workflows—e.g., dilution, pH adjustment, and precipitant addition—prior to potentiometric titration.
• Method validation studies requiring ≥100 consecutive injections with full intermediate precision tracking per ISO 5725-2.

FAQ

Is the 814 compatible with non-Metrohm titrators?
No. The 814 communicates exclusively via Metrohm Serial Bus (MSB) and requires firmware-level handshake protocols embedded only in Titrando series instruments.
Can the 814 perform gravimetric sample introduction?
No. It supports volumetric liquid handling only; integration with analytical balances requires external PLC coordination via digital I/O modules—not natively supported.
Does the optical tray sensor recognize barcoded vials?
No. It detects physical tray geometry and reflective marker patterns—not barcode or RFID data.
What is the maximum allowable viscosity for aspirated samples?
Up to 500 mPa·s at 20 °C when using Metrohm 802 dual-channel pumps with PTFE-coated tubing and extended dwell settings.
Is remote monitoring possible via Ethernet or Wi-Fi?
No. Communication is limited to MSB (dedicated serial bus) and USB (for firmware updates only); network connectivity must be implemented at the Titrando host level.