ABB NTAI04 Analog Input Termination Unit

Description

The ABB NTAI04 is a specialized RTD Analog Input Termination Unit designed for the Bailey Infi 90 and Symphony Plus systems. It serves as the physical interface for landing field wiring from Resistance Temperature Detectors (RTDs). The unit conditions the signals and routes them to the associated Analog Input Slave modules (typically the IMASI03 or IMASO11) for processing by the DCS.

Specifications

• Part Number: NTAI04 (Alternates: PNTAI04, YNTAI04)

• Input Channels: 16 independent channels.

• Sensor Type: Supports 3-wire RTDs (10 $\Omega$ Copper, 100 $\Omega$ Platinum, 120 $\Omega$ Nickel).

• Power Requirements: +24 VDC (0.25 A fuse protected).

• Module Compatibility: Primarily used with the IMASI03 Universal Analog Input Module.

• Accuracy: High-precision signal path designed to maintain the RTD's inherent accuracy.

• Cable Interface: Connects to the slave module via a standard NKAI03 or NKAI01 cable.

Features

• Lead-Wire Compensation: Specifically designed for 3-wire RTD configurations to automatically compensate for lead-wire resistance, ensuring temperature reading accuracy over long distances.

• Onboard Filtering: Includes passive RC filtering on each input to eliminate high-frequency noise and 50/60 Hz interference common in industrial environments.

• Individual Fusing: Each unit is equipped with a fuse (typically 0.25A) to protect the Infi 90 system from field-side electrical surges or wiring shorts.

• Calibration Support: Features a dedicated calibration socket and test points, allowing technicians to verify loop integrity without disconnecting field wiring.

• Modular Mounting: Designed to snap onto standard field termination panels (NFTP01), providing a clean and organized wiring architecture within the control cabinet.