Improved YT-3400 valve positioners from Rotork deliver enhanced hardware and diagnostics


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Improved YT-3400 valve positioners from Rotork deliver enhanced hardware and diagnostics

Rotork has improved its range of smart positioners to offer enhanced diagnostic and operating abilities. Valve positioners adjust an actuators position based on a control signal to meet specific process parameters (such as flow, pressure or temperature). This precise control of a valve actuator’s position makes Rotork’s smart positioners ideal for process control applications. The addition of enhanced diagnostic capabilities makes these positioners a great asset for on/off valve applications where detailed diagnostics are required. 

The YT-3400 smart valve positioner has undergone extensive hardware and software development to extend and enhance Rotork’s range of smart explosionproof pneumatic positioners. The YT-3400 range is available in multiple housing options (aluminium and stainless steel) for different regional certification requirements, making it highly versatile and ideal for a broad range of applications.

The YT-3400 now has improved diagnostic information and alarm monitoring, as well as offline diagnostic capabilities. Valve signature, advanced step tests and Partial Stroke Test (PST) can be operated from local or remote positions. Local display and push buttons allow fast setting and commissioning operations, while remote position triggering via the Digital Input control simplifies (for example) PST activation when the device is not easily reachable. Alarm prioritisation is available with clear NE107 symbols, while Device Description (DD) and Device Type Manager (DTM) files allow for full HART host compatibility.

The internal non-contact sensor (NCS) has been developed to increase stability and performance, reducing possible movement around the set point in extremely fast control systems. It no longer uses gears, reducing mechanical hysteresis and potential wear, resulting in more precise positioning around the set point. The printed circuit board, chip and electrical components have been updated to increase calculation speed, reactiveness and dynamic performance. All automated operations and positioning evaluations are 10 time faster than before. Auto-calibration, tests and automatic mode analysis have been enhanced, reducing downtime and operating time. These digital valve positioners are well-suited for use with control valves, operating valve modulation inside various production processes. They are also ideal for critical on/off applications in oil and gas processes, such as Emergency Shutdown (ESD) isolation systems.

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