NBK-04
page 6
NBK-04 K01/0922
5. Electrical connection
Optional electrical add-on parts (transmitter and limit contacts)
There is a separate operating manual for the assembly and commissioning of the
optional electrical add-on parts “
Operating manual for NBK transmitters and
limit contacts
”.
These operating instructions document the following electrical add-on parts:
Transmitter:
Reed contact resistor chain model
W
Reed contact resistor chain with transmitter model
M
Magnetostrictive sensor with transmitter model
T
Reed contact resistor chain with transmitter model
AE/AC
Reed contact resistor chain with transmitter HART model
HE/HC
Reed contact resistor chain with transmitter FF model
F
Limit Contacts:
Reed switch limit contact model
NBK-R
Limit contact high temperature model
NBK-RT200/RT400
Reed switch limit contact model
NBK-RV200NO/RV200NC
Reed switch limit contact NAMUR model
NBK-RV200NO/RV200NC
6. Operating Principle
A float in a dip pipe is connected with the magnet actuator inside the over-head
tube via a connecting rod.
The built-in magnet inside the magnet carrier triggers the mounted display and
other options (e.g. switches/transmitters) attached to the tube externally, in a non-
contacting manner.
Magnet roller indication
As the float passes by, the red/white rollers are rotated in succession by 180°
around their own axes. The rollers change from white to red as the level rises and
from red to white as the level falls. The level in a tank or a mixer is continuously
displayed as a red column, even when the power fails.