RWD R548 Automated Filter Cartridge Weighing Station

Overview

The RWD R548 Automated Filter Cartridge Weighing Station is an engineered precision weighing solution designed specifically for real-time mass monitoring of active carbon or chemical absorbent filter cartridges used in veterinary and laboratory anesthesia systems. It operates on high-stability load cell technology calibrated for dynamic weight acquisition under operational conditions—accounting for mechanical vibration, airflow-induced micro-loading, and thermal drift common in mobile anesthetic circuits. Unlike generic bench scales, the R548 integrates proprietary zero-tracking algorithms and adaptive tare compensation to eliminate measurement artifacts caused by hose coupling, gas flow pressure differentials, or minor mechanical flexure at the filter interface. Its primary function is to quantify absorbed anesthetic waste gases (e.g., isoflurane, sevoflurane) via mass gain, enabling predictive maintenance and regulatory compliance with occupational exposure limits (OELs) and facility safety protocols.

Key Features

• One-touch tare function with real-time gross weight display; resolution: 1 g across full 0–1500 g range
• Three-tiered alarm system with configurable auditory and visual signaling: Level I (pre-saturation), Level II (saturation threshold), and Overload (structural limit)
• Automatic cartridge recognition logic distinguishes between standard (190–210 g saturation) and compact (40–50 g saturation) RWD filter canisters without manual configuration
• Integrated mechanical decoupling design minimizes transmission of tubing stress and pneumatic pulsation to the load cell, ensuring measurement integrity during active gas scavenging
• No cartridge removal or repositioning required—continuous weighing during system operation maintains workflow continuity and reduces contamination risk
• Dual-mode silence control: short press (5-minute mute), long press ≥3 s (30-minute mute), both with automatic alarm resumption
• Compact footprint (120 × 95 × 65 mm) optimized for integration into mobile anesthesia carts or fixed procedure stations
• Optional mounting bracket (R548-MB) enables secure attachment to RWD portable anesthetic machines and ISO-standard mobile medical equipment frames

Sample Compatibility & Compliance

The R548 is validated exclusively for use with RWD-branded activated charcoal and soda lime filter cartridges (models R540 series). It does not support third-party or non-RWD canisters due to proprietary dimensional encoding and weight signature recognition. The device complies with IEC 61000-6-2 (immunity to electromagnetic interference) and IEC 61000-6-3 (emission limits for industrial environments). While not a medical device per FDA 21 CFR Part 820, it supports GLP-aligned documentation workflows when paired with RWD anesthesia recorders. Alarm thresholds align with AANA (American Association of Nurse Anesthetists) recommended scavenging efficiency benchmarks and OSHA permissible exposure limits (PELs) for halogenated anesthetics.

Software & Data Management

The R548 operates as a standalone hardware module with no embedded firmware update capability or USB/Bluetooth connectivity. All calibration, alarm logic, and unit settings are factory-programmed and immutable per regulatory design controls. Weight data remains local and non-exportable—consistent with low-risk ancillary device classification under ISO 14971. Audit trails are maintained manually via operator logbooks referencing timestamped alarm events. For facilities requiring electronic records, integration is achieved indirectly through synchronized video logging or external digital capture of LED indicators and audible tones during routine QA checks.

Applications

• Continuous saturation monitoring of CO₂ absorbent and volatile anesthetic scavenging filters in veterinary surgical suites
• Preventive maintenance scheduling for mobile anesthesia units in field clinics and mobile spay/neuter operations
• Compliance verification for AAALAC-accredited animal research facilities performing inhalant anesthesia
• Reduction of technician exposure during filter change cycles by eliminating manual weighing and subjective endpoint estimation
• Workflow optimization in high-throughput clinical training labs where rapid filter turnover is critical

FAQ

Does the R548 support calibration by end users?
No. Calibration is performed at the factory using NIST-traceable deadweight standards and locked via hardware write-protection. Field recalibration is not supported.
Can the R548 be used with non-RWD filter cartridges?
No. Mechanical and weight-based identification logic is specific to RWD R540-series canisters. Attempted use with alternate brands may result in failed recognition or inaccurate alarm triggering.
Is the R548 certified for use in human medical settings?
It is intended for veterinary and preclinical research applications only. It carries no CE mark, FDA 510(k), or MDR classification for human clinical use.
What is the operating temperature range?
10 °C to 40 °C, relative humidity ≤80% non-condensing—validated per IEC 60601-1 environmental testing clauses.
How is overload protection implemented?
A mechanical stop limiter engages at 1500 g ±5 g to prevent permanent deformation of the load cell; sustained overloading voids warranty and requires factory inspection.