NBK-19
Seite 4
NBK-19 K03/0322
4. Regulation Use
Any use of the Bypass-Level Indicator, model: NBK-19, which exceeds the
manufacturer’s specifications, may invalidate its warranty. Therefore, any
resulting damage is not the responsibility of the manufacturer. The user assumes
all risk for such usage.
5. Operating Principle
The Kobold bypass level indicator type NBK-19 is based on the simple principle
of cable and deflection pulley. The tank float, made of PPH or stainless steel, is
moved upwards and downwards by the medium according to the liquid level in
the tank. The tank float has a counter float (counterweight) which moves in a
transparent PVC tube depending on the liquid level. The two floats are connected
to each other through a cable and 2 deflection pulleys. The magnetic counter float
has a ring marker for reading of the scale on the bypass PVC tube.
The following options are available:
Magnet roller indicator
When the counter float travels past the red/white rollers, they rotate through
180°. The rollers change from white to red when the liquid level rises and from
red to white when the level falls. The liquid level is continuously indicated as a
red column, even in the event of a power outage.
Measurement transducer:
For remote transmission of the liquid level, a measurement transducer with
reed chain or a magnetostrictive sensor can be mounted on the outside of the
bypass tube. Using a built in transducer, a continuous standard signal of 4 to
20 mA is transmitted. This standard signal can be displayed using an
analogue or digital indicator device.
Universal indicator device:
An ADI series universal indicator device can be connected to indicate and
evaluate the standard signal (4 to 20 mA) produced by the measurement
transducer. For reasons of stability, this device is not mounted on the bypass
tube, but is supplied with wall mountings.
Limit contacts:
One or more reed contacts can be attached to the bypass tube to monitor the
limit values or to control the liquid level.
