ABB NTAI02 Analog Input Termination Unit

Description

The ABB NTAI02 is a 16-channel Analog Input Termination Unit (AITU) designed for the Bailey Infi 90, Network 90, and Symphony Plus distributed control systems (DCS). It serves as the physical interface for landing field wiring from thermocouples or millivolt sensors, providing essential signal conditioning and a local cold-junction reference before passing data to the system's slave and master analog modules.

Specifications

• Part Number: NTAI02 (Alternates: YNTAI02, PNTAI02)
  
• Input Type: 16 independent thermocouple or millivolt (mV) signals.
  
• Compatibility: Interfaces with IMASM02 Thermocouple Slave Modules and IMAMM03 Analog Master Modules.
  
• Power Requirements: +24 VDC at approximately 10 mA per slave module (0.25A fuse protected).
  
• Isolation: Galvanically isolated signal paths to protect against common-mode noise.
• Environmental Range: 0°C to 70°C (32°F to 158°F) operating temperature.
  
• Mounting: Standard field termination panel (NFTP01) or Harmony rack system.
  
• Dimensions: 17.8 cm x 2.5 cm x 17.8 cm (7.0" x 1.0" x 7.0").
  

Features

• Cold Junction Compensation: Includes an onboard temperature reference to ensure accurate thermocouple readings without external compensation hardware.
  
• Interconnection Scalability: Supports the linking of up to four NTAI02 units to expand signal monitoring capabilities within a single controller node.
  
• Diagnostic Tools: Equipped with a dedicated calibration socket and test input/output posts for on-site troubleshooting and loop verification.
  
• Field-Replaceable Protection: Features standard 0.25A / 250V glass fuses to shield the internal system from field-side electrical faults or short circuits.
• Legacy Support: Fully compatible with both older Network 90 hardware and newer Symphony Plus architectures, making it a critical part for maintenance and retrofits.