A&D AD-4408A Anti-Vibration Weighing Indicator
| Brand | A&D |
|---|---|
| Origin | Japan |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Product Origin | Imported |
| Model | AD-4408A |
| Pricing | Upon Request |
Overview
The A&D AD-4408A Anti-Vibration Weighing Indicator is a high-precision, industrial-grade digital weight transmitter engineered for stable and reliable operation in mechanically dynamic environments—particularly where structural vibration, conveyor-induced oscillation, or ambient mechanical noise compromises conventional load cell signal integrity. Built upon a Delta-Sigma analog-to-digital architecture with 24-bit effective resolution (1/16,000,000 internal A/D), the AD-4408A delivers metrologically robust weight data by combining ultra-low-noise analog front-end design (0.3 µVp-p max input noise) with adaptive digital filtering optimized to suppress resonance frequencies common in packaging lines, hopper feeders, and tank-level monitoring systems. Its core function is to condition, digitize, and display load cell signals from up to eight 350 Ω strain-gauge transducers powered by a tightly regulated 5 VDC ±5% excitation source. Designed for integration into automated process control architectures, it serves as a certified interface between analog weighing hardware and higher-level SCADA, MES, or PLC systems.
Key Features
- Anti-vibration digital filtering: Programmable low-pass and adaptive resonance-damping filters mitigate measurement drift caused by mechanical shock and periodic vibration—enabling stable readings even on non-isolated platforms.
- High-resolution signal acquisition: 100 Hz sampling rate with ≤0.005% F.S. nonlinearity and temperature drift compensation (±0.1 µV/°C max zero shift; ±15 ppm/°C max span drift).
- Robust analog input stage: Input sensitivity down to 0.15 µV/d, input range ±35 mV (±7 mV/V), and ≥10 MΩ input impedance ensure compatibility with precision load cells across diverse calibration scales.
- IP65-rated front panel: Sealed membrane keypad and gasketed enclosure support washdown-capable installations in food, pharmaceutical, and chemical processing environments.
- Modular fieldbus expansion: Optional Profibus-DP, Modbus-RTU (RS-485), and DeviceNet communication modules enable seamless integration into legacy and modern industrial networks without external gateways.
- Compliance-ready configuration: Supports audit-trail-enabled calibration logging (via optional software tools), zero/stable detection hysteresis adjustment, and dual-unit display (g/kg/t) with programmable division values (1, 2, 5, 10, 50).
Sample Compatibility & Compliance
The AD-4408A interfaces exclusively with analog strain-gauge load cells rated at 350 Ω nominal impedance and standard mV/V output (e.g., 2 mV/V, 3 mV/V). It supports both single- and multi-cell configurations (up to 8 sensors in parallel) with automatic zero balance adjustment across the full ±35 mV input range. The unit meets IEC 61326-1 (EMC for industrial environments), IEC 61000-4 series immunity standards (including surge, ESD, and conducted RF interference), and carries CE marking for use within the European Economic Area. While not intrinsically safe, its 10 VA power budget and isolated 20 mA current-loop output facilitate integration into SIL2-capable subsystems when deployed with appropriate safety relays. For regulated industries, the device supports traceable calibration workflows aligned with ISO/IEC 17025 documentation practices and can be validated under GMP Annex 11 and FDA 21 CFR Part 11 requirements when paired with compliant data capture software.
Software & Data Management
Local configuration is performed via front-panel keys with real-time feedback through six red status LEDs (ZERO, STABLE, GROSS, NET, HOLD, XX) and a six-digit green LED display (14.6 mm character height). All setup parameters—including filter coefficients, tare behavior, display units, and serial output protocol—are stored in non-volatile memory. The standard 20 mA current-loop output provides galvanically isolated analog transmission compatible with DCS analog input cards. When equipped with optional fieldbus modules, the AD-4408A exposes real-time weight, status flags, and diagnostic registers via standardized object dictionaries (e.g., Modbus holding registers 40001–40020). A&D’s proprietary PC configuration utility (Windows-based, USB-to-RS232 adapter required) enables batch parameter upload/download, firmware updates, and calibration certificate generation with timestamped operator ID logging.
Applications
- Dynamic checkweighing on high-speed packaging conveyors subject to belt vibration and product impact.
- In-line filling control for liquid, powder, or granular materials where platform instability affects repeatability.
- Hopper and silo level estimation using three-point load cell arrays in agitated or wind-exposed outdoor installations.
- Automated batching systems requiring synchronized weight acquisition and PLC-triggered discharge logic.
- Quality assurance stations in automotive component assembly where robotic handling induces transient mechanical noise.
- Pharmaceutical ingredient dispensing systems needing IP65 protection and audit-compliant weight recording.
FAQ
What types of load cells are compatible with the AD-4408A?
The indicator supports standard 350 Ω strain-gauge load cells with nominal outputs of 1–4 mV/V. It accommodates both single-ended and differential inputs within the ±35 mV range.
Can the AD-4408A perform internal calibration without external weights?
Yes—it supports both real-load calibration (using certified test masses) and digital calibration (via internal reference scaling), though NIST-traceable verification requires physical calibration weights.
Is the 20 mA current-loop output isolated?
Yes—the loop-powered output is fully galvanically isolated from the main power supply and sensor excitation circuitry.
Does the AD-4408A support multiple languages on the display?
No—the LED display uses fixed English abbreviations (NET, GROSS, ZERO, etc.) and does not support Unicode or multilingual firmware.
What is the maximum cable length between the AD-4408A and connected load cells?
For optimal noise immunity, A&D recommends ≤20 m total cable length with shielded twisted-pair wiring; longer runs require additional grounding strategy and may necessitate remote junction boxes.
