Key Parameters
Parameter Specification
Model Yokogawa AC8222
Type Analog Control Unit
System Compatibility CENTUM CS 3000 DCS
Input Signals Analog voltages (e.g., 1-5 V) or currents (e.g., 4-20 mA)
Output Signals Analog currents (e.g., 4-20 mA)
Control Algorithms PID, ON/OFF, ratio, cascade, and advanced control
Processing Speed ≤100 ms (typical scan cycle)
Accuracy ±0.1% of full scale (typical)
Isolation Channel-to-channel and field-to-system isolation
Operating Temperature 0°C to 50°C (32°F to 122°F)
Storage Temperature -40°C to 70°C (-40°F to 158°F)
Humidity Range 5-95% RH (non-condensing)
Power Supply 24 V DC (from DCS backplane)
Redundancy Support Optional redundant configuration
Certifications CE, UL, cUL, ATEX (for hazardous areas)
Key Features
High Precision Control: Advanced PID algorithms with auto-tuning capabilities.

Flexible I/O Handling: Supports multiple analog input and output signal types.

Seamless Integration: Fully compatible with CENTUM CS 3000 DCS engineering tools.

Robust Isolation: Protects against noise and ground loops for reliable operation.

Redundancy Ready: Optional hot-standby configuration for critical processes.

Diagnostic Functions: Self-diagnostics and status monitoring for maintenance.

Applications:

Process control in chemical and petrochemical plants

Temperature and pressure regulation in HVAC systems

Flow control in water and wastewater treatment

Level control in tanks and vessels

Energy management in industrial facilities