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Reliable Partial Stroke Test Independent from Valve Status

2015-01-30

SIL 3 safety solenoid driver with HART positioner

SIL 3 solenoid driver
Benefit from the SIL 3 solenoid driver!

Safety valves regulate dangerous overpressure and protect people and machines. In safety loops of permanently operating plants, these valves very often remain in one stop position because their safety function is rarely used. In order to ensure their operability, the valve movement has to be tested regularly by partial stroke tests. With the SIL 3 solenoid driver KFD2-RCI-EX1, you can execute these tests at any time independently from valve status, and also save an additional analog module.

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Partial stroke test – an essential safety requirement

A partial stroke test is used for testing safety valve functions. According to IEC 61508 and IEC 61511, this procedure is essential in safety applications in order to ensure availability and detect failures. Partial stroke tests:

  • Reduce the probability of failure in safety functions
  • Reveal malfunctions
  • Keep the PFD (probability of dangerous failure on demand) low

Limits of previous solutions

Conventional valves in safety applications typically contain two components: a binary input for emergency shutdown according to SIL 3, and an additional positioner for 4…20 mA / HART operation. The partial stroke test is either initiated in active mode via HART communication or by using a second signal connection between the control system and valve.

Optimized solution with SIL 3 solenoid driver

In case intelligent field devices are used, solutions with the KFD2-RCI-Ex1 are the right choice. The solenoid driver communicates with the field device using one connection. It offers complete diagnostic information even when the valve status is OFF. For this solution, only the single channel isolated barrier is necessary. The solenoid driver converts the digital switch signal of the safety control system into a feed current. The communication with the intelligent field device is independent of the valve status which is defined as a 4 mA ... 20 mA signal that is overlaid by the HART communication.

An Asset Management System is able to initiate a partial stroke test at any time and ensures communication even when the valve is in OFF-mode. Due to the 2-wire-connection, all diagnostics information is available at any time. Additionally, the solenoid driver KFD2-RCI-EX1 meets all SIL 3 requirements according to IEC 61508.

The SIL 3 solenoid driver at a glance

  • The communication with intelligent valves is independent of the valve position.
  • The partial stroke test can be executed even in case the valve is in OFF-mode.
  • Complete diagnostic information is available at any time.
  • The usage of a common 2-wire-connection saves costs and reduces wiring effort.
  • The solenoid driver meets all SIL 3 requirements according to IEC 61508.

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