NBK-01
NBK-01 K05/0322
page 5
5. Operating Principle
Kobold Bypass Level Indicators are used for continuous measurement, display and
monitoring of liquid levels. The bypass tube is attached onto the side wall of the
vessel.
According to the law of communicating tubes the level in the bypass tube equals
the level in the vessel. A float with embedded circular magnets in the bypass tube
follows the liquid level and transfers it in a non-contacting manner to a display or a
monitoring device fitted outside the tube. The following indication and monitoring
devices are available:
Magnetic roller indicator
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 advantage of ball displays is the higher
protection category, good visibility of 180 ° and higher vibration resistance with
filled version. The level in a tank or a mixer is continuously displayed as a red
column, even when the power supply fails.
Transmitter
A magnetostrictive transmitter can be mounted outside the bypass tube to
teletransmit the level. A continuous standard signal of 4-20 mA is output by means
of a fitted transmitter.
Limit contacts
One or more reed contacts for limit-value acquisition or also for level control can
be attached to the bypass tube.
