4: Actuator Accessories; 5: Instructions For Use In (Potential) Explosive Areas; Intended Use; Safety Instructions - Emerson EL-O-Matic F Series Sicherheitshandbuch

Safety Guide
DOC.SG.EF.EN Rev. 2
CAUTION - SPRING FORCE
„
Spring-return actuators contain springs in a compressed state. Follow these instructions
to release the spring force safely. The end caps of spring-return actuators sizes 25 to 600
should be free of the spring load after 10 full turns (crosswise relaxing) of the end cap
screws. If there is still spring load on the end cap, this might indicate a broken spring
cartridge. Stop this disassembly procedure immediately. Continuing might cause the end
cap to be "shot" away causing serious injury. Spring return actuator size 950 to 4000 have
long end cap screws to release the spring load safely.
Refer to Appendix A of manual DOC.IOM.EF.EN for the instructions on how to safely remove
the spring load before disassembling the end cap from the spring-return actuator.
„
A spring-return actuator mounted on a valve, which is stuck in mid stroke, contains a high
spring load which will cause a sudden rotation during disassembly of the actuator versus the
valve or valve bracket. This can cause serious injury to personnel or equipment damage.
Refer to Appendix A of manual DOC.IOM.EF.EN for instructions to safely remove the spring
load before disassembling the actuator from a valve, which is stuck in mid stroke.
4. Actuator Accessories
The actuator may be equipped with components for control and/or feedback. Check
the instructions of these components for installation, operation and maintenance
instructions.
5. Instructions For Use in (potential) Explosive Areas

5.1 Intended use

The EL-O-Matic F-Series pneumatic actuators are intended for use in areas in which
explosive atmospheres caused by mixtures of air and gases, vapours, mists or by
air/dusts are likely to occur. Therefore it may be used in classified Zones 1, 2 (Gases)
and/or 21, 22 (Dust).

5.2 Safety instructions

1. Assembly, disassembly and maintenance, is only allowed at the actuator, when, at
the time of the activity, there are no explosive mixtures.
2. Prevent entry of explosive mixtures into the actuator. We suggest utilizing a
solenoid with a "breather" function on spring-return actuators when used in
potentially explosive atmospheres.
3. Provided plastic position indicator is approved for use in potentially explosive (Ex)
gas group IIB areas.
—
In areas where Ex gas group IIC requirements apply, the plastic indicator for
actuator sizes 25 to 350 is approved for use.
—
In areas where Ex gas group IIC requirements apply, do not use the plastic
position indicator (for actuator sizes 600 up to 4000).
EL-O-Matic F-Series
April 2018
6
EN