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Directives and Standards
Pressure Equipment Directive (PED) 2014/68/EU
The level switch NRS 1-51 in conjunction with level electrode NRG 1...-51 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.
VdTÜV Bulletin “Wasserstand 100” (= Water Level 100)
The level switch NRS 1-51 in conjunction with the level electrodes NRG 1...-51 and NRG 1...-12 is type
approved according to the VdTÜV Bulletin "Water Level 100".
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 switch NRS 1-51 is certified acc. to IEC 61508 only if used in combination with level elec-
trode NRG 1...-51. This standard describes the functional safety of safety-related electrical/electronic/
programmable electronic systems.
The equipment combination NRG 1...-51 + NRS 1-51 corresponds to a type B subsystem with Safety
Integrity Level (SIL) 3.
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)
The level switch NRS 1-51 meets the requirements of the Low Voltage Directive 2014/35/EU and the
EMC Directive 2014/30/EU.
Summary of Contents for NRS 1-51
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