ABB TU890 3BSC690075R1 Module Termination Unit (MTU) with intrinsic safety interface(XIONGBA)

ABB TU890 3BSC690075R1 Module Termination Unit (MTU) with intrinsic safety interface(XIONGBA)

Brand Model: ABB TU890 3BSC690075R1
Product Name: Module Termination Unit with Intrinsic Safety Interface
Size: 194 mm × 58.5 mm × 64 mm
Weight: 0.3 kg
Origin: Sweden/Bulgaria
Certifications: ATEX/IECEx Zone 2, CE, UL, CSA, marine approvals

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Description

limitations.

ABB TU890 3BSC690075R1 Module Termination Unit (MTU) with Intrinsic Safety Interface

Product Overview

The ABB TU890 3BSC690075R1 is a compact modular termination unit (MTU) designed for ABB’s S800 I/O system, serving as a critical interface between field devices and I/O modules in industrial automation. Optimized for intrinsically safe (IS) applications, it enables reliable connection and management of analog/digital signals while distributing the module bus to downstream MTUs and I/O modules. The TU890 is certified for ATEX/IECEx Zone 2 hazardous environments, making it ideal for industries such as oil & gas, chemical processing, and power generation where explosion-proof safety is paramount 23.


Key attributes include a rugged polycarbonate housing (IP20-rated), supporting DIN rail or panel mounting, and compatibility with a wide range of S800 I/O modules (e.g., AI 890, AO 895, DI 890). The TU890 plays a pivotal role in distributed control systems (DCS) like ABB’s Advant 800xA, ensuring seamless integration of sensors, actuators, and process equipment in hazardous areas 217.

Technical Specifications

Parameter Value
Product Model ABB TU890 3BSC690075R1
Manufacturer ABB
Product Type Module Termination Unit (MTU) with intrinsic safety interface
Function Signal distribution hub for field devices and I/O modules in hazardous areas
Rated Voltage 50 V AC/DC
Maximum Current 2 A per I/O channel (limited by connected I/O module)
Operating Temperature -25°C to +70°C (horizontal mounting)
Storage Temperature -40°C to +85°C
Humidity 5–95% non-condensing
Physical Dimensions 194 mm (height) × 58.5 mm (width) × 64 mm (depth)
Weight 0.3 kg (net)
Mounting Type DIN rail or panel-mounted
Channels 27 signal terminals (3×9)
Isolation Voltage 50 V AC (dielectric test voltage)
Protection Class IP20
Certifications ATEX/IECEx Zone 2, CE, UL, CSA, marine approvals (ABS, BV, DNV-GL)
Compatibility S800 I/O modules (AI 890, AO 895, DI 890, DO 890, etc.)

Key Features and Advantages

  1. Intrinsic Safety Compliance:
    The TU890 is ATEX/IECEx-certified for Zone 2 hazardous environments, ensuring safe operation in explosive atmospheres. It includes a wiring separator to isolate field signals from the module bus, preventing spark propagation 23.
  2. High-Density Signal Management:
    • 27 Signal Terminals: Manages up to 27 field devices in a compact form factor (194 mm × 58.5 mm × 64 mm), reducing cabinet space requirements.
    • Mechanical Keying: 6-position keys enable 36 configurations, preventing incorrect insertion of I/O modules and ensuring compatibility with specific signal types (e.g., analog vs. digital) 217.
  3. Enhanced Environmental Resilience:
    • Wide Temperature Range: Operates reliably from -25°C to +70°C, withstanding extreme conditions in offshore platforms or chemical plants.
    • Robust Construction: IP20-rated housing and corrosion-resistant materials ensure durability in harsh industrial environments 317.
  4. Tool-Free Installation:
    Spring terminals enable fast, secure wiring without tools, reducing downtime during maintenance. The lightweight design (0.3 kg) simplifies installation in space-constrained cabinets 217.
  5. Multi-Industry Compatibility:
    Supports seamless integration with ABB’s Advant 800xa DCS, AC500 PLCs, and third-party systems via Profibus DP or Ethernet/IP. It is widely used in oil & gas, water treatment, and manufacturing sectors requiring explosion-proof solutions 220.

Application Areas

The TU890 excels in industries requiring reliable high-channel density signal management and intrinsic safety compliance:


  • Oil & Gas: Manages wellhead pressure sensors, valve actuators, and flow meters in offshore platforms and refineries.
  • Chemical Processing: Controls reactor temperature transmitters, distillation column valves, and safety interlocks in hazardous zones.
  • Power Generation: Integrates turbine control systems and boiler sensors in gas-fired power plants.
  • Water Treatment: Manages pump stations and pH sensors in wastewater treatment plants with potentially explosive atmospheres 220.

Comparison with Related Models

Model Channels Rated Voltage Isolation Voltage Key Applications
TU890 27 50 V AC/DC 50 V AC Intrinsically safe environments
TU842 16 50 V AC/DC 500 V AC (test) High-availability, redundant systems
TU847 16 24 V DC 50 V AC Redundant CI840/CI840A configurations
TU891 27 50 V AC/DC 50 V AC Non-intrinsic safety applications


The TU890’s intrinsic safety certification and high-channel density distinguish it from the TU842/TU847 series, making it suitable for hazardous area applications where explosion-proof design is critical 211.

Installation and Maintenance

Installation Steps:


  1. Mounting: Secure the TU890 on a DIN rail in a dry, well-ventilated area.
  2. Wiring: Connect field wiring (24 V DC power and signal cables) using the spring terminals.
  3. Key Configuration: Adjust mechanical keys to match the connected I/O modules (e.g., AI 890 vs. DI 890) 217.


Maintenance Recommendations:


  • Periodic Inspections: Check for loose connections or corrosion, especially in humid or corrosive environments.
  • Firmware Updates: Ensure compatibility with the latest DCS software versions via ABB’s Automation Builder tool.
  • Diagnostic Monitoring: Use ABB’s diagnostic tools to monitor signal integrity and module health 221.

Product Availability

  • Warranty: 1 year against defects in materials and workmanship. Some distributors offer extended warranties (e.g., 2 years) 1718.
  • Inventory: Limited stock available globally, with expedited delivery options (e.g., 3–5 days for Xiamen, China-based orders) 617.


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