Critical Technical Advantages
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Dual-Channel Universal Inputs: The TMT84 can process two independent signals from RTDs, thermocouples, resistance, or voltage transmitters. This allows for redundancy (Hot Backup) where the device automatically switches sensors if one fails, or differential temperature measurement for heat exchanger monitoring.
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PROFIBUS PA Integration: The device follows PROFIBUS PA Profile 3.02, ensuring standardized communication and easy integration into major control systems. Digital transmission eliminates the inaccuracies associated with analog 4-20 mA loops over long distances.
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FISCO/FNICO Conformity: Designing measuring points in hazardous areas is simplified due to FISCO/FNICO conformity according to IEC 600079-27. This allows for easier calculation of safety parameters for bus segments in explosive atmospheres.
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Advanced Sensor-Transmitter Matching: To achieve elite precision, the transmitter can be matched to the specific characteristics of the connected sensor. This minimizes the total measurement error and is essential for calibration-critical applications.
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Standardized Diagnostics (NE 107): The transmitter provides detailed health status according to NAMUR NE 107. It doesn’t just report a failure; it categorizes the issue (e.g., “Maintenance Required” or “Out of Specification”), allowing for targeted maintenance.
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Flexible Installation:
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Head Mount: Fits in standard DIN EN 50446 Form B terminal heads.
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Field Housing: Can be mounted in a robust field enclosure, including versions for Ex d (explosion-proof) applications, with options for pipe or wall mounting.
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Spring Terminal Technology: Optional tool-free spring terminals provide a fast, secure, and vibration-proof connection, reducing installation time and preventing loose wiring over time.
Technical Performance Matrix
| Feature | Details |
| Communication | PROFIBUS® PA Profile 3.02 |
| Input | 2 x Universal (RTD, TC, Ω, mV) |
| Accuracy | High precision with sensor-transmitter matching |
| Safety Approvals | ATEX (Ex ia, Ex nA), FM/CSA (IS, NI), FISCO/FNICO |
| EMC Compliance | NAMUR NE 21 |
| Galvanic Isolation | 2 kV (Sensor input to Bus) |
| Wiring | Optional tool-free spring terminals |
Primary Applications
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Critical Process Loops: High-availability applications where a sensor failure cannot be allowed to stop the process.
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Hazardous Area Bus Networks: Ideal for plants using PROFIBUS PA architecture in explosive gas or dust environments.
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Differential Temperature: Monitoring temperature gradients in reactors, boilers, or distillation columns.
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Asset Management: Using the digital bus to transmit extensive diagnostic data to central management software for predictive maintenance.
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Marine and Offshore: Reliable operation on vessels, meeting the strict environmental and EMC requirements of the marine industry.
