May 7, 2018 - With Sitrans TH320/420 and TR320/420, Siemens introduces HART (Highway Addressable Remote Transducer Protocol) temperature transmitters for a range of sensor types suitable for mounting in sensor head and rail mounting. Due to the safety integrity level (SIL) 2/3 certification according to IEC 61508 the temperature transmitters are particularly suited for safety-critical applications. The devices also have a number of country specific explosion protection certificates for all zones.. Main application areas include industries such as chemical, oil and gas, marine and power generation.
Deviations can be detected and monitored through the drift detection with dual-channel transmitters, e. g. for preventive maintenance. Electronic device descriptions (EDD, DTM and FDI) allow the transmitters to be used in all current distributed control systems. A quick start wizard is just one example of their features.
Measurement values, device functions and visual alarm signals can be displayed and operation planning and implementation uses special visualization components for Simatic PCS 7 (Sitrans Library).
The Sitrans TH420 and TR420 sensor backup function, drift detection and alarming uses the 4 wire connection, allowing a transition to the second sensor in case the first sensor fails. The continuous balancing of the two independent sensors measuring in parallel, while detecting and monitoring measuring value deviations, allows the scope of maintenance to be planned as required. Balancing the sensors using the Callendar-van Dusen method also meets the challenge of sensor inaccuracy caused by individual deviation from standardized Pt100 curves or by aging.