Continuous level measuring system
NB 4000
Technical information / Instruction manual
page G
Electrical installation
Handling
In case of improper handling or handling malpractice, the electric safety of the device cannot be
guaranteed.
Installation regulations
The local regulations or VDE 0100 (Regulations of German Electrotechnical Engineers) must be
observed.
Fuse
Use a fuse as stated in the connection diagrams.
RCCB protection
In case of a fault, the supply voltage must be automatically switched off by a RCCB protection switch
to protect against indirect contact with dangerous voltages.
Power supply switch
A voltage disconnection switch must be provided near the device.
Wiring diagram
The electrical connections are made in accordance with the wiring diagram.
Supply voltage
Compare the supply voltage applied with the specifications given on the name plate before switching
the device on.
Cable gland
Make sure that the screwed cable gland safely seals the cable and that it is tight (danger of water
intrusion).
Cable glands that are not used have to be sealed with a blanking element.
Conduit system
In case of using a conduit system (with NPT thread) instead of a cable gland the regulations of the
country, where the unit is installed, must be observed. The conduit must have a tapered thread either
NPT 1/2“ or NPT 3/4” in accordance with the unit and ANSI B 1.20.1. Not used inlets must be closed
tight with a metal blanking element.
Field wiring cables
All field wirings must have insulation suitable for at least 250V AC. The temperature rating must be at
least 80°C (176°F).
Relay protection
Provide protection for relay contacts to protect the device against inductive load surges.
Protection against static
charging
The housing of the unit must be grounded to avoid static charging of the unit. This is particularly
important for applications with pneumatic conveying and non-metallic containers.
General Safety Instructions
External equipotential
bonding terminal
Field wiring
A strain relief must be provided for the field wiring cables, if the device is installed with the factory
provided cable glands.
Cable glands for ATEX
Hazardous Locations
The used entry devices and blanking elements must have an adequate type approval and a
temperature range as defined in the technical data of the unit. In addition they shall be suitable
for the conditions and correctly installed. Where available the provided original parts of the
manufacturer must be used.
Conduit system for
ATEX and FM
Hazardous Locations
In addition the regulations of the country must be observed. The used flameproof seals and blanking
elements must have an adequate type approval and a temperature range as defined in the technical
data of the unit. In addition they shall be suitable for the conditions and correctly installed. Where
available the provided original parts of the manufacturer must be used.
Comissioning / opening
the lid
Comissioning only, when there are no dust deposits or swirls present.
Additional Safety Instructions for Hazardous Locations
Connect to equipotential
bonding of the plant
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NB 4000
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