High-Speed, High-Precision Weighing Indicator
AD-4421 is a weighing indicator/controller for an automatic weighing process system, which helps to boost productivity and quality in filling/dosing applications.
Brochure (PDF 425 KB)Manual (PDF 5 MB)Simplified manual (PDF 1.9 MB)
Display & Design
Clearly Visible LCD
White-segment LCD with:
Main Display: 8 digits, 14.5 mm character height
Sub Display: 20 digits, 5 mm character height
16-status indicators for real-time status and function display
Compact Panel Mount Design
Dimensions: 144 (W) x 72 (H) x 134.7 (D) mm
Panel cutout: 138 x 68 mm
IP65 Front Panel Protection
Ensures dust and water resistance when properly mounted to the control panel
High-speed & High-accuracy Weighing
High Performance Digital Filter (HPDF）
Effectively eliminates vibrations for stable and accurate weighing,
even in harsh environments. Reduces the need for mechanical anti-vibration measures,
cutting costs and maintenance. High-Speed Sampling
1200 times/second sampling rate enables fast and accurate measurements,
especially when combined with HPDF Easy HPDF Tuning
Use the free WinCT-AD4421 software to visually adjust filter strength and response speed.
Advanced Weighing Functions
Filling & Dosing Modes
Four modes for hopper and packer scales: simple and sequential filling/dosing Checkweighing Mode
Classifies products by weight using comparator outputs (up to 5 levels) Automatic Accumulation
Automatically totals net weights; can exclude over/underweight values 100-code Memory
Stores up to 100 sets of comparison groups (for filling and dosing modes)
and accumulation results Supplemental Filling
Automatically adds small amounts if the target weight is not reached
in filling and dosing modes
Versatile I/O Interfaces
Standard Interfaces
・ Control I/O: 6 inputs / 8 outputs (open collector, customizable)
・ Serial Output: For A&D printers and remote displays (20 mA current loop)
・ RS-485: For PC communication and command input (Modbus-RTU supported)
・ USB Type-C: For PC connection and data backup via WinCT-AD4421
Optional Interfaces
・ BCD Output: Outputs weighing data in BCD format
・ RS-422/485: Additional communication channel (Modbus-RTU supported)
・ RS-232C: For external displays, printers, or PC control
・ Analog Output: 4–20 mA / 0–10 V analog signal output
・ Modbus-TCP: Easy integration with PLCs and HMIs via Ethernet
