METTLER TOLEDO BBA238 Bench Scale

Overview

The METTLER TOLEDO BBA238 Bench Scale is an industrial-grade, hygienic weighing solution engineered for demanding environments where washdown capability, operational simplicity, and regulatory compliance are critical. Designed according to the principles of legal-for-trade metrology under OIML R76 and EN 45501, the BBA238 operates as a Class III approved scale—ensuring traceable accuracy for non-automatic weighing applications in production, packaging, food processing, and pharmaceutical support operations. Its core architecture integrates a hermetically sealed stainless-steel load cell with full weld-seam construction, enabling reliable performance under repeated exposure to water, cleaning agents, and mild sanitizing solutions. Unlike general-purpose platforms, the BBA238 is purpose-built for environments requiring frequent wet cleaning—not steam sterilization or high-pressure jetting—but consistent rinsing per ISO 14159 hygiene design guidelines. The indicator’s IP66/IP67 rating and the platform/load cell’s IP68/IP69K certification confirm its suitability for Zone 22 dust environments and intermittent liquid ingress scenarios common in HACCP-aligned facilities.

Key Features

• Hygienic stainless-steel construction: AISI 304 housing, pan, column, and platform frame ensure corrosion resistance and compatibility with standard food-grade cleaning protocols.
• IP69K-rated weighing platform and load cell assembly: Withstands high-volume, low-pressure冲洗 (up to 80–100 bar at 15°C), meeting stringent EU Machinery Directive and FDA-recommended equipment surface criteria.
• Large 60 mm high-contrast LCD display with adjustable white backlight: Ensures legibility under variable ambient lighting—from cold storage rooms to brightly lit production lines—without parallax error.
• Dual programmable function keys (F1/F2): Enable rapid access to user-defined workflows (e.g., toggle between checkweighing thresholds and counting modes), reducing operator steps and minimizing training overhead.
• Real-time status indication: Visual cues—including dynamic target weight bars and pass/fail icons—support immediate decision-making during inline checkweighing, aligning with ISO 2859-1 sampling plans.
• Mechanical overload protection system: Integrated limit stops prevent sensor damage beyond 150% of maximum capacity, preserving long-term repeatability and reducing calibration drift risk.
• Stabilization time <1 second: Achieved via adaptive digital filtering and optimized analog front-end signal conditioning—critical for high-throughput packaging lines.

Sample Compatibility & Compliance

The BBA238 accommodates diverse sample types—from bulk commodities and packaged goods to live animals—within its defined capacity range. Its open-frame platform design minimizes trapping points for particulates, supporting effective cleaning validation per ATP bioluminescence or microbial swab testing. The scale complies with mandatory regional metrological requirements including MID 2014/32/EU (Measuring Instruments Directive), NTEP Certificate of Conformance (USA), and JCSS accreditation (Japan). For regulated industries, it supports audit-ready operation when paired with METTLER TOLEDO’s optional data logging modules compliant with FDA 21 CFR Part 11 (electronic records/signatures) and GLP/GMP documentation standards. All firmware revisions undergo formal change control and version-locking to maintain data integrity across software updates.

Software & Data Management

The BBA238 features embedded firmware with configurable data handling logic. Standard RS232 serial output enables direct integration with label printers (e.g., Zebra ZT series), PLCs, or MES systems using ASCII protocol—no proprietary drivers required. Optional real-time clock (RTC) allows timestamped weight records aligned to enterprise time servers. While the base unit does not include internal memory or Ethernet/Wi-Fi, third-party middleware (e.g., LabX Lite or custom OPC UA gateways) can extend functionality for SPC charting, batch reconciliation, or ERP-linked inventory updates. Audit trail generation is supported through external logging devices compliant with ISO/IEC 17025 Clause 7.7.

Applications

• Checkweighing in primary and secondary packaging lines—verifying fill consistency against upper/lower tolerance bands per USP & Ph. Eur. monographs.
• Dynamic counting of components with automatic average piece weight calculation, used in electronics assembly and medical device kit preparation.
• Animal weighing in veterinary clinics and agricultural feedlots, leveraging hold-and-stabilize algorithms to compensate for movement-induced noise.
• Accumulation of sequential weighments for batch formulation—e.g., raw material dosing prior to mixing in nutraceutical manufacturing.
• Simple gross/net/tare operations in warehouse receiving, cross-docking, and returns processing—meeting ISO 9001 clause 8.5.2 traceability expectations.

FAQ

Is the BBA238 suitable for steam sterilization or high-pressure cleaning?
No. The indicator is rated IP66/IP67 and the platform/load cell IP68/IP69K—validating resistance to powerful water jets and immersion, but not saturated steam or >100 bar pressure. Refer to METTLER TOLEDO’s Cleaning Validation Guide for validated wipe-down and rinse procedures.
Can the BBA238 be calibrated internally without external weights?
No. It requires external calibration weights traceable to national standards (e.g., NIST, PTB). Internal calibration is not supported; however, the scale retains calibration stability over temperature ranges of 10–40°C per OIML R76 Annex C.
Does the RS232 interface support bi-directional communication?
Yes—when configured in command-response mode, the scale accepts remote commands (e.g., tare, print, zero) and transmits weight data, status flags, and error codes in ASCII format.
What is the battery life specification under typical use conditions?
With optional NiMH rechargeable battery, continuous operation exceeds 80 hours at 25°C ambient; standby current draw is 12 months shelf life when disconnected.
How does the BBA238 meet food safety requirements in HACCP-based facilities?
Its seamless stainless-steel surfaces, absence of crevices or threaded fasteners on wetted parts, and IP69K-certified sealing eliminate harborage points for Listeria or Salmonella—validated per EHEDG Doc. Type A and 3-A Sanitary Standards 12-04.