Brookfield BXW-SD-A/G Horizontal Cylindrical Steam Sterilizer (Radiation Grid Structure)

Overview

The Brookfield BXW-SD-A/G is a horizontal cylindrical steam sterilizer engineered for reliable, repeatable terminal sterilization of heat-stable laboratory and healthcare materials. It operates on saturated steam under pressure—principally leveraging moist-heat sterilization kinetics governed by the F₀ concept—to achieve ≥6-log reduction of microbial bioburden, including bacterial spores (e.g., Geobacillus stearothermophilus). The radiation grid structure within the chamber ensures uniform steam distribution and eliminates cold spots, a critical requirement for validation-compliant cycles. Unlike vertical autoclaves, its horizontal orientation facilitates efficient loading/unloading of large-volume or tray-based loads—including glassware, stainless steel instruments, culture media, and textile packs—while maintaining strict thermal homogeneity across the full 280 L chamber volume.

Key Features

• Chamber constructed from high-grade austenitic stainless steel (SUS 304), welded via TIG (tungsten inert gas) process to ensure corrosion resistance, structural integrity, and compliance with ASME BPVC Section VIII Div. 1 design principles.
• Microprocessor-based control system with real-time display of phase status (pre-vacuum, heating, sterilization, exhaust, drying), chamber temperature, pressure, and elapsed time—enabling full operational transparency and cycle traceability.
• Interlocked safety architecture meeting IEC 61010-1 requirements: (1) Sterilization cycle cannot initiate unless door is fully closed and mechanically locked; (2) Internal pressure > 0.01 MPa automatically engages door lock mechanism, preventing accidental opening.
• Self-expanding silicone door gasket ensures consistent sealing performance over >10,000 cycles without replacement; validated for leak rates ≤ 0.1 mbar·L/s per EN 285 Annex B.
• Integrated electric steam generator with automatic water feed pump and dual-level water level monitoring: low-water cutoff disables heating elements during sterilization and triggers audible/visual alarm; pressure-regulated operation with spring-loaded safety valve set at 0.25 MPa (±0.01 MPa).
• Programmable exhaust mode selection (slow exhaust, fast exhaust, vacuum-assisted exhaust) to prevent boil-over of liquids or deformation of heat-sensitive packaging.
• PID temperature regulation with adaptive tuning capability—minimizes overshoot (< ±0.5 °C) and maintains chamber setpoint stability within ±1.0 °C during hold phase.
• G-model variant includes a water-ring vacuum pump and dedicated drying heater, enabling post-sterilization vacuum drying per ISO 15883-1 Annex D; residual moisture content ≤ 0.2% w/w verified per standard test protocols.

Sample Compatibility & Compliance

The BXW-SD-A/G accommodates a broad range of load types: porous loads (textiles, pipette tips), non-porous items (metal instruments), liquid media (in sealed bottles or flasks), and wrapped configurations. Its radiation grid chamber geometry supports uniform steam penetration in accordance with EN 285 Clause 6.3. Validation-ready design includes provisions for thermocouple and biological indicator placement per ISO 17665-1 Annex A. Documentation package supports IQ/OQ/PQ execution, and firmware logs retain full cycle data (temperature, pressure, time stamps) for ≥1000 cycles—satisfying audit requirements under GLP, GMP, and FDA 21 CFR Part 11 when paired with optional RS232/USB data export or printer interface.

Software & Data Management

The embedded controller records all critical parameters with timestamp resolution of 1 second. Cycle data can be exported via USB flash drive or serial interface for integration into LIMS or electronic batch record systems. Optional thermal printer (model PT-232) provides hard-copy output compliant with ALCOA+ principles—each printout includes operator ID, cycle ID, start/end times, max/min/mean temperatures, pressure profile summary, and pass/fail status based on preset acceptance criteria. Audit trail functionality tracks user logins, parameter modifications, and alarm events with immutable timestamps.

Applications

This sterilizer serves core functions across academic research labs, pharmaceutical QC facilities, clinical microbiology departments, and medical device manufacturing cleanrooms. Typical use cases include: sterilization of agar plates and broth media prior to inoculation; depyrogenation of glass vials and syringes; routine decontamination of surgical instrument sets; preparation of sterile saline and buffer solutions; and validation of sterilization processes for Class B medical devices per EN 13060. Its 280 L capacity and horizontal configuration make it especially suitable for batch processing of ISO Class 5–7 cleanroom consumables.

FAQ

What sterilization standards does the BXW-SD-A/G comply with?
It meets the mechanical and performance requirements of ISO 17665-1, EN 285, and GB 8599. Design and safety features align with IEC 61010-1 and PED 2014/68/EU.
Can the unit perform vacuum-assisted air removal?
Yes—the G-model integrates a water-ring vacuum pump capable of achieving ≤10 mbar absolute pressure pre-sterilization, essential for porous load sterilization per EN 285 Annex C.
Is remote monitoring or network connectivity supported?
Standard configuration includes RS232 and USB ports for local data retrieval; Ethernet or Wi-Fi modules are available as custom OEM upgrades upon request.
What maintenance intervals are recommended for the steam generator and safety valves?
Steam generator descaling every 3 months (frequency depends on feedwater hardness); safety valve functional testing every 6 months and certified recalibration annually per EN 13445-3.
Does the system support programmable multi-step cycles?
Yes—up to 10 user-defined programs, each with configurable pre-vacuum duration, heating ramp rate, sterilization hold time, exhaust strategy, and drying parameters (G-model only).