5
Directives and standards
Pressure Equipment Directive (PED) 2014/68/EU
Water level limiters are safety accessories as defined in the Pressure Equipment Directive (PED). The
level electrode NRG 16-36 in conjunction with level switch NRS 1-50 is EC type approved according to
EN 12952/EN 12953. These Directives state, among other things, the requirements made on limiting
systems and equipment for steam boiler plants and (pressurised) hot-water installations.
ATEX (Atmosphère Explosible)
The level electrodes NRG 1...-50, NRG 1...-11 and NRG 16-36 are simple items of electrical equipment
as specified in EN 60079-11 section 5.7. According to the European Directive 2014/34/EU the equipment
must be equipped with approved Zener barriers if used in potentially explosive areas. Applicable in
Ex zones 1, 2 (1999/92/EC). The equipment does not bear an Ex marking.
Note that the requirements of the IEC 61508 are not met if the NRG 1...-50, NRG 1...-11, NRG 16-36 +
Zener ba NRS 1-50 are interconnected!
VdTÜV Bulletin "Wasserstand 100" (= Water Level 100)
The level electrodes NRG 1-50, NRG 1...-11 and NRG 16-36 in conjunction with the level switch
NRS 1-50 are type approved according to the VdTÜV Bulletin "Water Level 100".
The level electrode NRG 16-36 is also type approved in conjunction with level switches NRS 1-52 /
NRS 1-55 or NRS 1-2 / NRS 1-5.
The VdTÜV Bulletin "Wasserstand (=Water Level) 100" specifies the requirements made on water level
control and limiting equipment for boilers.
Functional Safety acc. to IEC 61508
The level electrodes NRG 1...-50 / NRG 16-36 are certified acc. to IEC 61508 only if used in
combination with level switch NRS 1-50. This standard describes the functional safety of safety-
related electrical/electronic/programmable electronic systems.
The equipment combination NRG 1...-50 or NRG 16-36 + NRS 1-50 corresponds to a type B sub-
system with Safety Integrity Level (SIL) 3.
Note on the Declaration of Conformity / Declaration by the Manufacturer
For details on the conformity of our equipment according to the European Directives see our
Declaration of Conformity or our Declaration of Manufacturer.
The current Declaration of Conformity / Declaration of Manufacturer are available in the Internet under
www.gestra.com/documents or can be requested from us.
