Level limit switch
Series RF 3000
Technical Information / Instruction manual
page
Electrical installation
Handling
In the case of inexpert handling or handling malpractice the electric safety of the device cannot be
guaranteed.
Protective earthing
Before any electrical installation, the terminal inside the housing must be connected to the protective
earth.
Installation regulations
The local regulations or VDE 0100 (Regulations of German Electro technical Engineers) must be
observed.
WIth use of 24V supply voltage, an approved power supply with reinforced insulation to mains is
required.
Fuse
Use a fuse as stated in the connection diagrams.
RCCB protection
In the case of a defect, the distribution voltage must automatically be cut off by a RCCB protection
switch so as to protect the user of the device from indirect contact with dangerous electric tensions.
Power supply switch
A Power-supply-disconnecting switch must be provided and marked near the device.
Wiring diagram
The electrical connections have to be made according to the wiring diagram.
Supply voltage
Compare the supply voltage applied with the specifications given on the electronic and name plate
before switching the device on.
Cable gland / closing
element
The screwed cable gland and closing element must have following specifications:
Ingress protection IP67, temperature range from -40°C to +80°C, UL or VDE certified (depending on
the country where the unit is installed), pull relief.
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 locked with a closing element.
A strain relief must be provided for the field wiring cables, when the device is installed with the factory
provided cable glands.
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 closing element.
Field wiring cables
• The diameter has to match to the clamping range of the used cable gland.
• The cross section has to match with the clamping range of the connection terminals and consider
the max. current.
• All field wirings must have insulation suitable for at least 250V AC.
• The temperature rating must be at least 90°C (194°F).
• If higher immunity interferences as specified in the stated EMC standards are present (see chapter
approval), a shielded cable is required, otherwise an unshielded instrumentation cable is
satisfactory.
Connecting the terminals
Make sure that max. 8mm (0.31“) of the pigtails are bared (danger of contact with live parts).
Guiding the cables in the
terminal box
Cut the field wiring cables to appropriate length to fit properly into the terminal box.
Remote housing
The remote cable must be installed sepatated from power supply lines to avoid immunity
interferences The min. bending radius of 50mm must be observed.
General Safety Instructions
RFnivo
®
1
2
3
4
5
6
7
8
9
10
11
12
RF 3000 d
gi241014
19
