Emerson EL-O-Matic F Series Safety Manual

2
SIL Safety Manual
DOC.SILM.EF.EN Rev. 1 September 2018
Functional Specication
Section 2: Functional Specication
The safety function for El-O-Matic F-Series pneumatic actuator is dened as follows:
Double-Acting Scenario:
a. When an unsafe condition is detected in a plant by a process sensor, the
controller, via actuator control system, drives the Actuator to close the
shut-down valve, depressurizing (if under pressure) the Opening side of
the actuator and pressurizing the Closing side of the actuator.
b. When an unsafe condition is detected in a plant by a process sensor, the
controller, via actuator control system drives the Actuator to open the
blow-down valve, depressurizing (if under pressure ) the Closing side
of the pneumatic actuator and pressurizing the Opening side of the
pneumatic actuator.
Single-Acting Scenario:
a. When an unsafe condition is detected in a plant by a process sensor, the
controller, via actuator control system drives the Actuator to rotate with
sufcient torque to move a valve to its fail-safe state when hold-position
air pressure is released.
The El-O-Matic brand Actuator Selection Procedure provides functional denition with
specics on input variables and performance.
In any case, the choice of the safety function to be implemented is responsibility of the
system integrator.
Section 2: Functional Specification

Emerson EL-O-Matic F Series Specifications

General

Brand	Emerson
Model	EL-O-Matic F Series
Category	Controller
Language	English