Critical Technical Advantages
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Dual-Channel Universal Inputs: The TMT85 features two independent sensor inputs that accept RTDs, thermocouples, resistance, and voltage signals. This supports advanced process strategies such as sensor redundancy (automatic switchover upon failure), differential measurement, and average temperature calculation.
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Control in the Field (CiF): As a FOUNDATION Fieldbus™ device, the TMT85 can host function blocks (such as PID control), allowing control loops to be executed directly at the device level. This increases system availability by reducing the reliance on a central PLC or DCS for basic control logic.
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FISCO/FNICO Compliance: Designing segments in hazardous areas is simplified through FISCO/FNICO conformity. This standardization allows for the connection of multiple devices to a single bus segment in explosive atmospheres without complex individual safety calculations.
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Advanced Sensor-Transmitter Matching: To achieve the highest possible measurement accuracy, the transmitter can be programmed with specific sensor characteristics. This eliminates the “interchangeability error” common in standard probes, which is vital for high-precision thermal processes.
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Standardized Diagnostics: Following NAMUR NE 107, the TMT85 provides clear status signals regarding the health of the device and the sensors. It includes hardware fault recognition and sensor monitoring functions that identify issues like wire breaks or drift before they impact the process.
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Flexible Installation Options:
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Head Mount: Fits standard DIN EN 50446 Form B terminal heads.
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Field Housing: Can be installed in a robust field enclosure for direct outdoor or Ex d (explosion-proof) applications, complete with wall or pipe mounting brackets.
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Tool-Free Spring Terminals: Optional spring terminal technology allows for fast, secure, and vibration-proof wiring, significantly reducing installation time and the risk of loose connections in high-vibration environments.
Technical Performance Matrix
| คุณสมบัติ | รายละเอียด |
| Communication | FOUNDATION Fieldbus™ H1 |
| 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 |
| Galvanic Isolation | 2 kV (Sensor input to Bus) |
| Function Blocks | Analog Input (AI), PID, etc. |
| Wiring | Optional tool-free spring terminals |
Primary Applications
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Critical Process Control: High-availability applications where redundant temperature sensing is required to prevent unscheduled shutdowns.
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Hazardous Area Bus Segments: Ideal for chemical and oil & gas plants utilizing FOUNDATION Fieldbus™ architecture in explosive environments.
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Heat Exchanger Monitoring: Using the dual-channel input for real-time differential temperature measurement to track efficiency.
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Safety Instrumented Systems (SIS): Deploying reliable, digitally-monitored sensors in safety-critical loops.
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Asset Management: Utilizing the digital bus to provide rich diagnostic and proactive maintenance data to central plant management systems.
