4
GES_FE51-52-53SP+FE121SP_1116.docx
1. Introduction
1.3 Intended
use
Intended use
Cylinder pressure regulators of Series FE51/52/53-SP and FE121-SP are intended for use with corrosive
gases up to quality 6.0. The permissible gases and pressure ranges are specified on the type plate.
Cylinder pressure regulators reduce a variable inlet pressure to an outlet pressure which is as constant as
possible.
Introduction of pressure for the process gas is effected via the inlet screw fitting (e.g. cylinder connection).
Appropriate measures must be taken to prevent the introduction of pressure via the pressure regulator
outlet.
Cylinder pressure regulators with the designation FE51/52/53-SP2A can be purged with the process gas via
the two valves installed in the outlet.
Cylinder pressure regulators with the designations FE51/52/53-SP2, FE51/52/53-SP3 and FE121-SP are
equipped with an additional inlet valve, providing the option of purging the fitting with a separate purge gas.
Pressure regulators without electrical components (such as a contact pressure gauge or pressure
transducer) may be used in potentially explosive atmospheres, since they do not have a potential ignition
source of their own (ignition hazard evaluated in accordance with DIN EN 13463-1).
The ignition hazard has to be taken into account with pressure regulators with electrical components. The
ignition hazard must be evaluated based on the documentation for the respective electrical components,
taking into account their incorporation into the overall system, and Directives 2014/34/EU (ATEX 114) and
1999/92/EC (ATEX 137) must be observed.
Foreseeable misuse
The following operating conditions are deemed to constitute misuse:
Operation with gases that are not specified on the type plate
Use with gases in their liquid state
Operation outside the permissible technical limit values
Non-observance of the legal regulations and other
provisions valid on-site
Failure to comply with this Operating Manual
Failure to carry out inspection and maintenance work
Failure to heed the information on the type plate and in the product data sheet
Pressurisation counter to the normal direction of flow
The mixing of gases via the normal gas inlet and the purge gas inlet
