ABB Bailey NTAI02 Termination Unit NTAI-02

ABB Bailey NTAI02 Analog Input Termination Unit

The ABB Bailey NTAI02 is an Analog Input Termination Unit (AITU) for the INFI 90 distributed control system. It bridges the gap between analog field devices (sensors, transmitters) and the digital world of the DCS, providing signal conditioning, isolation, and conversion for reliable process variable measurement.

Key Specifications

• Part Number: NTAI02
• Product Type: Analog Input Termination Unit
• Series: INFI 90 / Symphony
• Manufacturer: ABB / Bailey Controls
• Channels: 8 or 16 (varies by configuration)
• Input Signal Types: Voltage (±10 mV to ±10 V), current loop, thermocouple, RTD
• Accuracy: ±0.1% to ±0.3%
• Power Supply: 24 V DC
• Interface: Arcnet (backplane communication)
• Material: High-grade aluminum alloy
• Dimensions: 127 × 152 × 102 mm (5.0" × 6.0" × 4.0") or 177.8 × 35.6 × 127 mm (7.0" × 1.4" × 5.0")
• Weight: 0.3 kg (0.66 lbs) to 0.8 kg (varies by source)
• Operating Temperature: -20°C to +60°C
• Storage Temperature: -40°C to +85°C
• Humidity: 5% to 95% non-condensing
• Mounting: INFI 90 field termination panel or DIN rail

Features & Benefits

1. Signal Conditioning: Amplifies, filters, and isolates raw analog signals for high-fidelity data acquisition.
2. Digital Conversion: Converts conditioned analog signals into digital data for INFI 90 DCS processing.
3. Multi-Sensor Support: Accepts voltage, current, thermocouple, and RTD inputs for flexible application coverage.
4. Enhanced Data Integrity: Minimizes noise and interference for accurate control decisions.
5. Durable Construction: High-grade aluminum alloy housing withstands industrial environments.

Applications

• Temperature transmitter signal termination
• Pressure and flow transmitter interfaces
• Analytical sensor (pH, conductivity) connections
• Level and position sensor signal conditioning

FAQ

Q: What is the difference between NTAI02 and NTAI04?
A: The NTAI02 is a general analog input termination unit supporting voltage, current, and some temperature inputs. The NTAI04 is specifically an RTD analog input termination unit optimized for resistance temperature detector inputs.

Q: Does NTAI02 support 4-wire RTD connections?
A: The NTAI02 supports thermocouple and some RTD configurations. For dedicated 3-wire or 4-wire RTD applications, the NTAI04 is recommended.

Installation Guide

1. Mount NTAI02 in INFI 90 field termination panel or DIN rail.
2. Connect field analog signals to designated input terminals.
3. Verify shield grounding for each signal cable.
4. Link NTAI02 to corresponding IMASI02/IMASI03 slave module via backplane.
5. Configure channel scaling and sensor type in MFP function blocks.
6. Calibrate against known reference signals.

Selection Tips

• Sensor Type: Confirm your field devices output signals compatible with NTAI02 input ranges.
• Channel Count: 8-channel vs. 16-channel variants available—match to your I/O density requirements.
• Accuracy: ±0.1% accuracy suits most process control; specify higher precision if required for critical loops.