Flowserve NRS1-8 - Manual (Page 4)

4
Important Notes
Danger
The terminal strip of the NRS -8 is live during operation. This presents the danger
of electric shock!
Cut off power supply before attaching or detaching the housing lid and the terminal
strips of the equipment.
Usage for the intended purpose
Use level switch NRS -8 only in conjunction with level electrodes NRG 6-, NRG 7-, NRG 9-
for level control (high level alarm).
Safety note
The equipment must only be installed and commissioned by qualified and competent staff.
Retrofitting and maintenance work must only be performed by qualified staff who – through adequate
training – have achieved a recognised level of competence.
Explanatory Notes
Scope of supply
NRS 1-8
 Level switch NRS -8
 Installation manual
Description
Self-monitoring high-level alarm with periodic self-checking routine, designed for use in conjunction
with level electrodes NRG 6-, PN 40, NRG 7-, PN 63, NRG 9-, PN 60. The equipment
combination detects the max. water level (high level alarm).
Application in steam and (pressurized) hot water boilers in accordance with TRD 60 and TRD 604
sheet  and sheet  as well as EN 95 and EN 953.
ATEX (Atmosphère Explosible)
The equipment constitutes a simple item of electrical equipment as defined in DIN EN 5000 section
5.4. According to the European Directive ATEX 94/9/EC the equipment may only be used in potentially
explosive atmosphers if it is provided with approved Zener barriers.
Applicable in Ex zones ,  (999/9/EC). The equipment does not bear a CE marking. The suitability of
the Zener barriers is certified in a separate document.