Critical Technical Advantages
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Optimized for Thermocouple Inputs: The TMT188 is specifically engineered to handle the millivolt signals of thermocouples. It features integrated cold junction compensation, which ensures that temperature readings remain accurate even as the ambient temperature at the connection head fluctuates.
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Fixed-Range Simplicity: By utilizing a fixed measuring range, the TMT188 offers a “fit and forget” solution. This reduces commissioning time and prevents unauthorized or accidental changes to the device settings in the field.
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Compact Head Mounting: Designed to fit into a standard DIN Form B terminal head, the TMT188 allows for the conversion of the sensor signal directly at the point of measurement. This reduces the risk of electromagnetic interference that can occur when sensitive TC wires are run over long distances.
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Safety and Reliability: The transmitter is compliant with NAMUR NE 43, meaning it will automatically drive the output signal to a specific error level in the event of a sensor break or short circuit. This immediate failure information is critical for maintaining process safety.
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Robust Isolation and Protection: With built-in galvanic isolation and EMC performance according to NAMUR NE 21, the TMT188 provides a clean, stable signal even in electrically noisy industrial environments.
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Comprehensive Approvals: The device is certified for use in hazardous areas (ATEX Ex ia, FM IS, CSA IS) and includes specific dust zone 22 protection. It also carries marine approvals, making it suitable for engine room and exhaust gas monitoring on vessels.
Technical Performance Matrix
| Feature | Details |
| Input | 1 x Thermocouple (TC) (Fixed range) |
| Output | 4 to 20 mA (Analog) |
| Accuracy | High precision with integrated cold junction compensation |
| Safety Compliance | NAMUR NE 43 (Fault signaling) |
| EMC Compliance | NAMUR NE 21, CE |
| Galvanic Isolation | Yes |
| Approval | ATEX, FM, CSA, Marine |
Primary Applications
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High-Temperature Processes: Monitoring furnaces, ovens, and kilns where thermocouples are required for their high thermal limits.
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Marine Exhaust Gas: Tracking the temperature of engine exhaust on ships, where vibration resistance and marine certifications are mandatory.
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Hazardous Area Measuring Points: Providing intrinsically safe temperature data from explosive gas or dust environments (Zone 0, 1, or 22).
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Industrial Utilities: Monitoring steam lines and heat exchangers in chemical or food processing plants.
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OEM Equipment: A reliable, standardized component for machine builders who require consistent temperature monitoring with minimal setup.
