Installation and Connection
page 35
NF 650 - rev. 01 / 29.06.2020
21 Electrical Installation
DANGER
Danger from electrical current
Disconnect the unit from mains power.
Working on electric wiring may cause electric shock. Observe electric information provided
on the nameplate.
Non-observance may result in personal injuries.
Note
Observe the national installation regulations.
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Be sure to take the following precautions:
1. Installation work should be carried out by qualified personnel only.
2. For electrical installation the local regulations in the respective countries (in Ger-
many e.g. VDE 0100) shall be referred to.
3. Further statutory standards (local), regulations and technical rulings have to be
taken into account.
4. For installation in wet environments or in areas subject to flooding risk, extra
protection such as by using a residual-current-operated protective device (RCD) is
necessary if required.
5. Regarding Ex protection check whether the instrument’s power supply needs to be
integrated into the facility’s emergency shut-down concept.
6. Before feeding the rated voltage, transmitter and sensor installation must be cor-
rectly completed. Check that the installation is correct.
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How to connect the sensors can be found starting at page 46, connecting the power
supply is described on page 42.
21.1 Wiring to the Terminal Blocks
All NivuFlow transmitters are equipped with push-in tension clamp terminals. The use of these
push-in tension clamp terminals enables an easy pre-installation of the transmitter. This allows
verifying individual sensors, input and output signals etc. as well as easy transmitter replace-
ment if required.
The tension clamp terminal blocks are suitable for connecting single-wire and multiple wire
copper cables. These cables are vibration-proof.
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To open the contacts on the tension clamp terminal blocks, use gentle pressure with a slot
screwdriver on the front-side orange elements.
To connect the power supply, push-in and screw-type tension clamp terminal blocks are used.
To connect the power supply, use a slot screwdriver with a blade width of 3.0...3.5 mm.
Important note
Unplug and connect the tension clamp terminal blocks only in de-energised condition
disconnected from mains power.
