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The ABB TR104 is a high-performance, rail-mountable temperature transmitter designed for precise and reliable industrial process control. As part of ABB's comprehensive temperature measurement family, this specific model is engineered to convert signals from resistance thermometers (Pt100) into a standardized, linear 4-20 mA analog output . The ABB TR104 is recognized for its robust design, high accuracy, and flexibility, making it a core component for monitoring and controlling temperatures in demanding environments across the chemical, petrochemical, power generation, and food & beverage industries . Its availability in standard and intrinsically safe Ex versions allows for deployment in a wide range of applications, including hazardous areas .

Model Number ABB TR104 (also TR104-Ex, TR104-ExN for hazardous areas)

Primary Function Rail-Mounted Temperature Transmitter

Input Type Resistance thermometer (Pt100 according to IEC 751)

Measuring Range -200°C to +850°C

Output Signal 4-20 mA, temperature-linear, two-wire technology

Supply Voltage 10.5 - 30 V DC (reverse polarity protected)

Accuracy High precision due to digital, low-drift signal processing

Ex (Hazardous Area) Approval Intrinsic safety: II 2 G EEx ia IIC T6 (zone 1); Non-sparking: II 3 G EEx nA II T6 (zone 2)

Operating Temperature -40°C to +85°C

Sensor Lead Resistance Max. 100 Ω for 3-wire/4-wire configurations

Mounting Rail / ExRail mounting

Weight Approx. 200g

Proper handling of the ABB TR104 during operation is essential for system integrity. Follow these steps for installation and setup:

Pre-Installation Verification: Before handling, ensure the system power is disconnected. Verify that the model variant (standard or Ex) matches your area classification and system requirements.

Physical Mounting: Mount the ABB TR104 onto a standard DIN rail or an ExRail in hazardous areas. The rail-mount design allows for space-saving installation in control cabinets . For field mounting, versions with a flange for direct attachment to pipes or tanks are available .

Electrical Connections: Connect the Pt100 sensor and power supply according to the terminal designations. The model supports 2-wire, 3-wire, and 4-wire sensor configurations. For 3-wire connections, ensure the lead resistance is balanced to minimize error . Connect the positive supply to the "+" terminal and the negative to the "-" terminal for the two-wire 4-20 mA loop .

Configuration and Power-On: For versions supporting HART 7, use a HART communicator or PC-based software to configure the measuring range and damping . Restore power and verify the ABB TR104 output signal corresponds to the measured temperature via the control system.

Adhering to these precautions will safeguard both the operator and the equipment when handling this model:

ESD Safety: The ABB TR104 contains sensitive electronic components. Handle the module by its edges and avoid touching circuit boards or connectors to prevent electrostatic discharge damage.

Environmental Control: Install the model in an area free from strong electromagnetic interference. Ensure the ambient temperature remains within the specified range, and humidity is below 95% RH for non-Ex versions .

Hazardous Area Compliance (Ex Versions): For the ABB TR104-Ex installed in explosive atmospheres, follow all local regulations and installation control drawings. The interconnection with associated apparatus must be verified, and the maximum permissible ambient temperature for the temperature class must be observed . The device must be installed by qualified personnel familiar with intrinsic safety requirements.

Verify Wiring: Before energizing, double-check all sensor and power connections against the wiring diagram. Confirm the supply voltage at the model's terminals is a minimum of 10.5 V at maximum loop current .

Sensor Compatibility: Ensure the connected sensor type (Pt100) and wiring configuration (2, 3, or 4-wire) match the model's setup. Incorrect wiring can lead to significant measurement errors.

Regular maintenance ensures the longevity and reliability of the ABB TR104:

Periodic Inspection: Annually, inspect the model for any signs of dust accumulation, loose connections, or corrosion. Use clean, dry compressed air to remove debris from the unit's surfaces.

Diagnostic Monitoring: For HART-enabled versions, periodically use a HART communicator to read diagnostic data such as sensor failure codes, loop resistance, and electronics temperature . The model features error signaling for sensor line break and short-circuit .

Calibration Verification: Verify the ABB TR104 accuracy against a calibrated temperature source as per site procedures. The recommended verification interval according to some metrology records is 2 years .

Connection Tightness: During scheduled system downtime, verify that all field wiring connections to the model are secure, as thermal cycling and vibration can cause loosening over time .

Fault Handling: If output is abnormal (underranging: 2.5-3 mA; overranging: 22-26 mA), first check sensor connections for looseness or breakage, or use a HART terminal to review the fault log .

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