Critical Technical Advantages
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Optimized for Thermocouples: The TMT128 is engineered to handle the unique millivolt signals generated by thermocouples. It includes integrated cold junction compensation, ensuring that the temperature measurement remains accurate despite changes in the ambient temperature at the transmitter terminals.
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Compact Cabinet Integration: With a housing width of only 22.5 mm, this transmitter is ideal for mounting on standard DIN rails (IEC 60715). Its slim profile allows maintenance teams to pack a large number of temperature channels into a single control panel.
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High Ambient Stability: The device maintains high precision throughout the entire ambient temperature range of the cabinet. This robustness is critical for preventing measurement drift in environments where cooling may be inconsistent.
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Safety and Fault Monitoring: Fully compliant with NAMUR NE 43, the TMT128 identifies sensor breaks or short circuits and immediately drives the 4 to 20 mA signal to a designated error level. This allows the PLC or DCS to trigger safety protocols instantly.
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Galvanic Isolation: The transmitter features 2 kV galvanic isolation between the sensor input and the current output. This protects your control system from ground loops and electrical noise, which is particularly important when using ungrounded thermocouples in high-interference environments.
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International Approvals: The TMT128 is certified for use in hazardous areas (ATEX Ex ia, FM IS, CSA IS) and carries GL shipbuilding approval, making it a versatile choice for both onshore plants and offshore vessels.
Technical Performance Matrix
| Feature | Details |
| Input | 1 x Thermocouple (TC) (Fixed range) |
| Output | 4 to 20 mA (Analog) |
| Accuracy | High precision with cold junction compensation |
| Housing Width | 22.5 mm (DIN rail mounting) |
| Safety Compliance | NAMUR NE 43 (Fault signaling) |
| EMC Compliance | NAMUR NE 21, CE |
| Galvanic Isolation | Yes |
Primary Applications
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High-Temperature Monitoring: Utilizing thermocouples for furnaces, kilns, and exhaust gas monitoring where RTDs would exceed their temperature limits.
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Marine and Shipbuilding: Monitoring engine temperatures and thermal processes on ships requiring GL certification.
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Hazardous Area Measuring Points: Safe operation in explosive gas or dust atmospheres via intrinsically safe (Ex ia) installation.
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Centralized Control Panels: Consolidation of multiple high-temperature points into a single 4-20 mA bus for factory automation.
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General Industry Utilities: Reliable monitoring of steam lines, boilers, and heat treatment processes.
