Description
Detailed Parameter Table
| Parameter Name | Parameter Value |
| Product Model | ABB TU840 |
| Manufacturer | ABB |
| Product Category | Temperature Transmitter |
| Input Type | RTD (Pt100/Pt1000) or Thermocouple |
| Output Signal | 4-20mA HART |
| Accuracy | ±0.1% of span |
| Temperature Range | -200°C to +850°C (depends on sensor) |
| Operating Temperature | -40°C to +85°C |
| Power Supply | 12-30V DC |
| Protection Rating | IP67 |
| Hazardous Area Cert. | ATEX, IECEx |
| Mounting Type | DIN Rail or Head Mount |
| Dimensions | 22.5 x 100 x 115 mm |
ABB TU840
Product Introduction
The ABB TU840 is a high-precision temperature transmitter designed for industrial process measurement and control applications. As part of ABB’s renowned temperature measurement portfolio, this compact yet robust device converts signals from RTDs or thermocouples into standardized 4-20mA output with HART communication capability.
Engineered for reliability in harsh environments, the ABB TU840 features exceptional measurement accuracy and long-term stability, making it ideal for critical temperature monitoring in oil & gas, chemical processing, and power generation applications. Its flexible configuration options allow seamless integration with both new and existing control systems.
Core Advantages and Technical Highlights
Superior measurement performance: The ABB TU840 delivers industry-leading ±0.1% accuracy across its full measurement range, ensuring precise temperature monitoring for process optimization and quality control. Advanced signal processing algorithms provide stable readings even in electrically noisy environments.
Robust construction: With IP67 protection and wide operating temperature range (-40°C to +85°C), the ABB TU840 withstands demanding industrial conditions including moisture, dust, and vibration. Its corrosion-resistant housing ensures reliable operation in offshore and chemical plant applications.
Flexible configuration: The transmitter supports multiple sensor types (Pt100, Pt1000, various thermocouples) and offers programmable measurement ranges, damping time, and other parameters through convenient HART communication interface.
Intrinsic safety: Certified for hazardous areas (ATEX, IECEx), the ABB TU840 can be installed in Zone 0/1/2 environments, providing safe temperature measurement in potentially explosive atmospheres.
Typical Application Scenarios
The ABB TU840 excels in critical temperature measurement applications across multiple industries:
In oil & gas production, it monitors process temperatures in pipelines, separators, and storage tanks, withstanding harsh offshore conditions while maintaining measurement integrity.
For chemical processing plants, the transmitter provides accurate temperature data for reactor control, distillation columns, and heat exchangers, with its corrosion-resistant design handling aggressive media.
In power generation, the ABB TU840 ensures safe operation by monitoring temperatures in turbines, boilers, and cooling systems, with its high reliability minimizing unplanned downtime.
Food & pharmaceutical manufacturers benefit from its hygienic design options and precise temperature control for pasteurization, sterilization, and other thermal processes.
ABB TU840
Related Model Recommendations
ABB TU830: Basic version without HART communication
ABB TU845: Dual-channel version for redundant measurements
ABB TU860: Field-mounted version with LCD display
ABB TU870: High-temperature version (up to 1200°C)
ABB TU880: PROFIBUS-PA version for digital bus systems
ABB TU890: Foundation Fieldbus version
ABB TZIDC: Positioner with similar housing design
These models provide alternatives for different communication protocols, temperature ranges, and installation requirements while maintaining the same quality standards as the ABB TU840.
Installation, Commissioning and Maintenance Instructions
Installation preparation: Before installing the ABB TU840, verify the ambient conditions match the specified operating range. Ensure proper cable glands are used for IP67 protection in outdoor installations. For hazardous areas, follow the appropriate installation guidelines for intrinsic safety.
Maintenance suggestions: Regular verification of calibration is recommended annually or per process requirements. Check for moisture ingress in the terminal compartment during routine inspections. The ABB TU840 requires minimal maintenance, but sensor and wiring integrity should be verified periodically. Configuration changes can be made via HART communicator without opening the housing.
Service and Guarantee Commitment
ABB provides a 36-month warranty for the ABB TU840, covering material and manufacturing defects. Global service support includes calibration services, technical consultation, and rapid replacement options. The product meets all relevant international standards (IEC 60751, IEC 61508) and comes with complete documentation for validation in regulated industries. ABB’s application engineers are available for specific integration support and troubleshooting.
