ABB TU890

Description

ABB TU890 Module Termination Unit (MTU)

1. Product Description

• Intrinsic Safety Isolation: Complies with ATEX/IECEx Zone 2 standards, ensuring safe operation in explosive atmospheres by preventing electrical sparks from reaching hazardous areas.
• Signal Termination: Supports up to 27 field devices through 3×9 signal terminals, with color-coded wiring separators for easy installation and maintenance.
• Wide Compatibility: Works seamlessly with ABB’s S800 I/O modules and third-party devices, accepting both analog (4–20mA, 0–10V) and digital (NAMUR sensors, voltage-free contacts) signals.
• Compact and Rugged Design: Engineered to withstand harsh conditions, including temperatures ranging from -40°C to +70°C during storage and 0°C to +55°C during operation, while occupying minimal space in control cabinets.

2. Technical Parameters

Parameter	Specification
Brand	ABB
Model	TU890
Type	Module Termination Unit (MTU)
Safety Certification	ATEX/IECEx Zone 2 (suitable for Zone 0/1 connections)
Signal Terminals	3×9 isolated terminals (27 total), rated for 50V isolation
Wiring Capacity	Supports solid/stranded wires (0.2–4 mm²)
Voltage Supply	24V DC ±10% (derived from S800 I/O system)
Operating Temperature	0°C to +55°C (non-condensing humidity: 5%–95%)
Storage Temperature	-40°C to +70°C
Dimensions (H×W×D)	194mm × 58.5mm × 64mm
Weight	0.3 kg
Compatibility	ABB S800 I/O modules (AI890, DI890, AO890) and third-party devices
Certifications	CE, RoHS, ATEX/IECEx, marine compliance (ABS, BV, DNV-GL)

ABB TU890

3. Advantages and Features

• Enhanced Safety Compliance: The TU890 meets strict intrinsic safety standards (IEC 60079-11), reducing the risk of ignition in explosive environments. This feature is critical for industries like oil and gas, where even minor electrical faults can lead to catastrophic failures.
• Flexible Signal Handling: Supports a wide range of signal types, eliminating the need for multiple termination units. For example, it can simultaneously connect pressure sensors (4–20mA) and safety switches (digital signals), simplifying wiring and configuration.
• Space-Efficient Design: At 194mm × 58.5mm × 64mm, the TU890 is 30% more compact than traditional terminal blocks, making it ideal for retrofitting into existing control cabinets with limited space.
• Reliable Performance: Built with industrial-grade materials, the module resists electromagnetic interference (EMI) and vibrations, ensuring stable signal transmission. Its mean time between failures (MTBF) exceeds 100,000 hours, minimizing downtime in mission-critical operations.
• Cost-Effective Integration: By integrating intrinsic safety barriers directly into the termination unit, the TU890 reduces hardware costs by up to 20% compared to using separate safety modules and terminal blocks.

4. Application Areas and Case Study

Application Areas:

• Chemical Processing: Monitors and controls reactant flow, pressure, and temperature in chemical reactors and distillation units.
• Oil and Gas: Manages valves, pumps, and gas sensors in offshore platforms, refineries, and pipelines.
• Power Generation: Integrates with turbines and generators to ensure safe voltage and current regulation.
• Pharmaceuticals: Controls sterile processes in cleanrooms, where strict safety and precision are non-negotiable.

Case Study:

5. Competitive Comparison

• Comprehensive Safety Certifications: Offers ATEX/IECEx Zone 2 compliance, a feature not universally available in competing products, especially those designed for non-hazardous areas.
• Dual Signal Compatibility: Natively supports both analog and digital signals in a single unit, whereas many alternatives require separate modules for different signal types.
• Marine and Industrial Compliance: Meets marine certification standards (ABS, BV, DNV-GL), making it suitable for offshore and harsh marine environments, a niche where few competitors offer equivalent solutions.
  

  ABB TU890

6. Selection Recommendations

• Safety Requirements: Prioritize the TU890 if your application operates in or near hazardous areas (Zone 2) and requires intrinsic safety isolation.
• Signal Type Mix: If your system uses a combination of analog and digital field devices, the TU890’s dual signal support will streamline wiring and reduce component count.
• Environmental Conditions: For installations with temperature fluctuations or high humidity, verify that the module’s operating range (0°C to +55°C) and non-condensing humidity tolerance (5%–95%) match your site’s conditions.
• System Scalability: Pair the TU890 with ABB’s S800 I/O modules (e.g., AI890 for analog input, DI890 for digital input) to create a fully integrated automation solution that supports future expansions.

7. Precautions

• Installation:
  • Always power down the entire system before connecting or disconnecting the TU890 to prevent electrostatic discharge (ESD) damage to sensitive components.
  • Use shielded cables for signal connections and route them separately from high-voltage power cables to minimize EMI interference.
• Maintenance:
  • Regularly inspect terminal connections for tightness and corrosion, especially in humid or corrosive environments.
  • Update firmware using ABB’s official software (e.g., Control Builder M) to ensure compatibility with the latest system updates and security patches.
• Storage:
  • Store unused TU890 modules in their original packaging in a dry, dust-free environment within the specified storage temperature range (-40°C to +70°C).
  • Handle the module with anti-static wrist straps to protect against ESD during handling and installation.