AND AD4212A-100 Precision Microbalance with Integrated Load Cell

Overview

The AND AD4212A-100 is a high-precision, compact microbalance engineered for integration into automated printed electronics manufacturing lines—particularly where real-time, in-process mass verification of semiconductor components, photomask coatings, conductive inks, and photoresist dispense volumes is required. Unlike conventional benchtop analytical balances, the AD4212A-100 integrates a proprietary electromagnetic force compensation load cell directly into a minimized mechanical architecture (measuring head width: 80 mm), enabling stable, sub-milligram weighing under dynamic industrial conditions. Its operating principle relies on closed-loop electromagnetic force restoration, delivering metrological traceability to JIS B 7721 Class I and OIML R76-1 standards. Designed for ISO Class 5–7 cleanroom-adjacent environments, the unit meets IP54-rated protection against dust ingress and water splashing—critical for operation near inkjet deposition stations or roll-to-roll coating modules.

Key Features

• High-resolution weighing capability: 0.1 mg readability across full 110 g capacity, supporting gravimetric validation of <1 µL ink droplets and thin-film precursor dispenses.
• Ultra-fast stabilization: ≤1.1 seconds for loads up to 30 g and ≤1.3 seconds up to full scale—optimized for inline cycle-time reduction in high-throughput printing cells.
• Modular pan configuration: Removable standard pan and support bracket allow rapid interchange with application-specific fixtures (e.g., wafer carriers, stencil-mounted substrates, or ink reservoir adapters).
• Dual-mode comparator functionality: Three-stage pass/fail output with programmable tolerance bands (g, mg, %, count, carat, monme), synchronized with external PLCs via dry-contact relays and audible feedback.
• Industrial-grade connectivity: RS-232C serial interface compliant with EIA/TIA-232-F, supporting bidirectional data streaming at configurable baud rates (600–19200 bps) for SPC integration and MES synchronization.
• Cleanroom-compatible construction: Measuring head fabricated from electropolished SUS316 stainless steel; draft shield included as standard to mitigate airflow-induced drift during open-bench deployment.

Sample Compatibility & Compliance

The AD4212A-100 accommodates non-magnetic, low-static, and thermally stable samples typical in printed electronics fabrication—including silicon wafers, flexible PET/PI substrates, metalized foils, and viscous functional inks (e.g., Ag nanoparticle dispersions, PEDOT:PSS, ZnO sol-gels). Its 50 × 50 mm pan surface supports direct placement or fixture-based loading without requiring recalibration. The system complies with JIS B 7721-1:2019 (non-automatic weighing instruments), conforms to ISO/IEC 17025 calibration traceability requirements when serviced by accredited labs, and supports audit-ready documentation workflows aligned with GLP and GMP Annex 11 principles. While not FDA 21 CFR Part 11–certified out-of-the-box, its WinCT-compatible data logging enables implementation of electronic signature and audit trail protocols via validated third-party LIMS interfaces.

Software & Data Management

The balance operates natively with AND’s WinCT v4.x software suite (Windows 10/11 compatible), providing real-time graphing, statistical process control (SPC) charting (X̄-R, Cpk), batch export to CSV/Excel, and customizable report templates. Raw weight data streams include timestamp, stability flag, comparator status, and environmental metadata (if external temperature/humidity sensors are connected). All RS-232 transmissions adhere to AND’s ASCII protocol format—enabling seamless parsing by LabVIEW, Python (pySerial), or custom SCADA systems. Data integrity is reinforced through cyclic redundancy check (CRC) framing and optional hardware handshaking (RTS/CTS). Firmware updates are delivered via USB-to-serial adapter and preserve user-defined comparator thresholds and unit preferences.

Applications

• Gravimetric verification of inkjet-printed electrode patterns on flexible substrates (e.g., RFID antennas, touch sensor traces).
• In-line mass monitoring of photoresist spin-coating uniformity prior to UV exposure.
• Quantitative dispensing validation for silver nanowire inks used in transparent conductor patterning.
• Batch consistency checks of solder paste volume per stencil aperture in hybrid microelectronics assembly.
• Calibration reference mass handling in cleanroom-based metrology labs supporting semiconductor packaging processes.

FAQ

Is the AD4212A-100 suitable for use inside a nitrogen-purged glovebox?
Yes—the unit operates within ambient temperatures of 10–30 °C and relative humidity ≤80% RH (non-condensing); its IP54 rating and absence of internal batteries or vented components permit safe installation in inert-atmosphere enclosures with appropriate cable feedthroughs.
Can the comparator outputs drive a PLC input directly?
Yes—each of the three relay contacts provides isolated, normally open (NO) dry-contact switching rated at 24 VDC / 0.5 A, compatible with standard industrial PLC digital input modules.
Does the balance support automatic internal calibration?
No—the AD4212A-100 relies on external calibration using the supplied 100 g Class M1 stainless steel weight; however, it retains calibration coefficients across power cycles and supports scheduled manual recalibration via front-panel menu or WinCT command.
What is the maximum sampling rate when streaming data via RS-232C?
At 19200 bps with minimal protocol overhead, the balance can transmit stabilized weight values at up to 10 Hz—sufficient for closed-loop feedback control in semi-automated dispensing setups.
Is the draft shield removable for integration into custom enclosures?
Yes—the acrylic draft shield is mechanically detachable and may be replaced with OEM-designed optical access ports or laminar flow shrouds without compromising metrological performance.