Sellersville, PA: The global leader in functional safety, industrial cybersecurity, and alarm management for the process industries, exida, has certified Tokyo Keiso’s Torque Tube Type Level Transmitter FST4000 Series for Safety Integrity Level (SIL) 2 capability per IEC 61508: 2010. FST4000 is a torque tube displacement type level indicating transmitter with intelligent data-processing functionality.
In 2010, Tokyo Keiso Co., Ltd contracted exida with a hardware assessment of the FST4000. An FMEDA was completed, and the calculated values were within the range for hardware architectural constraints of SIL 2 according to IEC 61508. However, the systematic failures were not covered by the assessment, so the Tokyo Keiso team consulted exida for a way to come to a judgement of the systematic capability based on the ANSI-accredited exida assessment process.
Tokyo Keiso plans to work with exida for future projects with different types of sensors. “We appreciate exida’s guidance,” said Nagaoki Kayama, Technical Adviser to Tokyo Keiso. “We are delighted to receive the SIL 2 certification.”