Foxboro® provides Partial Stroke Testing Solutions with SRD991 and SRD960 positioners for Safety Systems and Emergency Shutdown (ESD) applications.

Business Value
With more than 50 years experience in valve positioners, Foxboro offers the most complete line of instrumentation available from pneumatic and analogue devices to
the most advanced smart positioners with Hart®, Profibus or Fieldbus communication.
The proven reliability and robustness of Foxboro positioners helps to improve process performance, providing predictive maintenance and Advanced Diagnostics.

Benefits
•Test interval of the ESD valves extended up to 5 years
•Increased safety in testing the SOV
•Spurious Trip kept to the lowest level

About Foxboro® Valve Positioners
Foxboro has been producing On-Off and Modulating Control valve positioners of the highest quality since 1961 and offers the widest range of valve posi-tioners, from pneumatic and analogue devices to the most advanced smart positioners with Hart, Profibus or Fieldbus communication, to work alongside any application in any industry.One particular application is Partial Stroke Testing. PST is a method where the ESD valve is typically moved 10-20% and returned to its original position in a short period of time. As the most common dangerous failure mode in a static ESD valve is “failure to move,” On-line Partial Stroke Testing generated by the smart positioner SRD991 (intrinsic safety application) and SRD960 (Explosion proof application) is the key to safety. Moreover, the PST positioner can offer operators a tool to enable predictive maintenance on the ESD valves with data history and friction analysis.

Parameter Name	Parameter Value
Options	digital