Description
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Input Sensor | Pt100 RTD (IEC 751) |
| Temperature Range | -200°C to +850°C (configurable spans) |
| Output | 4-20 mA |
| Minimum Span | Per ordering information |
| Mounting | DIN rail |
| Power Supply | Typical 24 V DC loop powered |
| Accuracy | High accuracy per Pt100 standard |
| Housing | Rail mount enclosure |
| Ex Version | TR104-Ex available for hazardous areas |
4. Product Introduction
The ABB TR104 is a rail-mounted temperature transmitter that converts Pt100 resistance thermometer signals into a standard 4-20 mA output. It mounts on DIN rail in control cabinets for process temperature monitoring in industrial plants.
Technicians use it for reliable, accurate temperature signal transmission from field RTDs to DCS or PLC analog inputs. The fixed or configurable ranges and rail mounting make it straightforward to integrate into existing panels without head-mounted limitations.
- TR104
- TR104
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No output current | Loop power missing | High | Measure loop voltage (~24 V DC) | Check power supply and wiring |
| Output stuck at 4 mA | Open RTD circuit | High | Measure resistance at input terminals | Verify Pt100 sensor and 3-wire connections |
| Erratic reading | Wiring noise or ground loop | Medium | Check shield grounding | Use twisted shielded cable, single-end ground |
| Incorrect scaling | Wrong range configured | High | Compare output mA to expected temperature | Confirm configuration matches sensor range |
| Output at maximum | Short or sensor fault | High | Disconnect sensor and check output | Test with precision resistor simulator |
RTD wiring problems cause most field issues. If the transmitter itself is suspected after basic checks, swap with a spare and bench test.
6. Frequently Asked Questions (FAQ)
What sensors does the TR104 support? Primarily Pt100 RTDs in 3-wire configuration. It handles standard IEC 751 Pt100 over a wide temperature span.
Is this new original stock? Yes, New Original / New Surplus. Each unit undergoes visual inspection and basic loop testing prior to shipment.
How do I configure the measuring range? Many versions use fixed ranges per ordering code. For adjustable models, follow the front-panel or dip-switch instructions in the manual. We can supply pre-configured units for your specific range.
Can it be used in hazardous areas? Yes, the TR104-Ex variant is certified for Zone 1/0 applications. Confirm the exact part number for your environment.
What is the typical power requirement? Loop-powered 4-20 mA output, usually 12-36 V DC depending on load. Verify exact limits in your unit’s datasheet.
How accurate is the transmitter? It delivers high accuracy consistent with Pt100 class standards and transmitter linearization. Refer to the datasheet for specific error figures.
Do you provide calibration or test reports? Yes. Basic functional test reports are included. Full calibration certificates available upon request for critical applications.
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