Overview
The Bailey 6634679F1 NTAI02 is a thermocouple input termination unit designed for the ABB Infi 90 and Network 90 distributed control systems. This module facilitates the connection and termination of analog thermocouple and millivolt signals from field instruments to the control system. The NTAI02 mounts within the Field Termination Panel (NFTP01) and provides robust signal conditioning with integral cold-junction reference capability for accurate temperature measurement.
Key Features
- Terminates 16 thermocouple or millivolt input signals from field devices
- Supports thermocouple types B, E, J, K, N, R, S, and T
- 16-bit analog-to-digital conversion with 0.1% full-scale accuracy
- Integral cold-junction reference for automatic thermocouple compensation
- Up to four NTAI02 units can be cascaded for expanded I/O capacity
- CSA certified for ordinary (nonhazardous) industrial locations
- Dedicated calibration socket and test input/output posts for field verification
- No configuration required—plug-and-play operation in INFI 90 cabinets
Technical Specifications
- Input Channels: 16 thermocouple or millivolt inputs
- Input Signal Types: Thermocouple (Types B, E, J, K, N, R, S, T), millivolt (±10 mV to ±10 V)
- Resolution: 16-bit digital
- Accuracy: 0.1% of full scale
- Isolation: 250 Vrms between channels and power
- Supply Power: +24 VDC with 0.25 A fuse (250 V)
- Mounting: Field Termination Panel (NFTP01)
- Operating Temperature: Per Infi 90 cabinet specifications
- Surge Protection: Meets IEEE-472-1974 Surge Withstand Capability
- Certification: CSA certified for process control equipment (ordinary locations)
- Compatibility Models: YNTAI02, RNTAI02, PNTAI02, NTAI-02
Typical Applications
- Process control systems monitoring temperature via thermocouples
- Power generation, oil and gas, chemical, and water treatment facilities
- Data acquisition and logging of multi-point temperature signals
- Industrial automation where analog thermocouple inputs interface with Infi 90 or Network 90 controllers
- Legacy DCS retrofit and system expansion projects
Compatibility & Replacements
Compatible With
- ABB Infi 90 distributed control system (DCS)
- Bailey Network 90 control systems
- IMASM02 Thermocouple Input Slave Module
- IMAMM03 Analog Master Module
- NFTP01 Field Termination Panel
- Infi 90 cabinet power and communication networks
Replaces / Drop-In Replacement For
- Bailey NTAI02 (any variant or refurbished unit)
- Verify specific compatibility with your system integrator or engineering team before ordering.
Works With
- NKTU01 and NKTU11 termination unit cable assemblies
- NKAI01 interconnect cable for multi-unit cascading
- Bailey Controls configuration and calibration software
- Standard thermocouple input slave modules (IMASM02)
