Samson 3730-2 - Explosion Protection

8 EB 8384-2 EN
Safety instructions and measures
Personal protective equipment
Nopersonalprotectiveequipmentisrequiredforthedirecthandlingofthepositioner.Work
on the control valve may be necessary when mounting or removing the device.
Î Observetherequirementsforpersonalprotectiveequipmentspeciedinthevalvedocu-
mentation.
Î Check with the plant operator for details on further protective equipment.
Revisions and other modications
Revisions,conversionsorothermodicationsoftheproductarenotauthorizedbySAMSON.
They are performed at the user's own risk and may lead to safety hazards, for example. Fur-
thermore, the product may no longer meet the requirements for its intended use.
Safety features
Upon failure of the air supply or electric signal, the positioner vents the actuator, causing the
valve to move to the fail-safe position determined by the actuator.
Warning against residual hazards
Thepositionerhasdirectinuenceonthecontrolvalve.Anyhazardsthatcouldbecausedin
the valve by the process medium, the signal pressure or by moving parts are to be prevented
by taking appropriate precautions. They must observe all hazard statements, warning and
caution notes in these mounting and operating instructions, especially for installation, start-
up and service work.
If inadmissible motions or forces are produced in the pneumatic actuator as a result of the
supply pressure level, it must be restricted using a suitable supply pressure reducing station.
Explosion protection
− Explosive dust atmospheres of zone21 or zone22
ThefollowingappliestotypeofprotectionExiincombustibledustatmospheres:
Ifintrinsicsafetyisimpairedbytheinuenceofdust,anenclosurecomplyingwith
Clause6.1.3ofEN60079-11withatleastindegreeofprotectionIP5Xmustbeused.
TherequirementsaccordingtoClause6.1.3applytothecableglandsaccordingly.The
degreeofingressprotectionisveriedbyatestaccordingtoIEC60529andEN60079-
0(e.g.performedbyVDE).
For use in the presence of combustible dust in compliance with type of protection
ExtbIIIC(protectionbyenclosure),observeClause5.6.3ofEN60079-14.