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PKG 4-20 Liquid Level Transmitter
for continuous level measurement
for remote transmission of liquid levels using the air bubbler method

 

 

Mode of operation

Due to the force of gravity and as a function of the specific gravity of the liquid, the pressure
at the bottom of a tank is proportional to the liquid level in the tank. The pressure
corresponding to the liquid level is measured by means of an immersion bell mounted just
above the bottom of the tank or an immersion tube which is open at the end and
suspended slightly above the bottom of the tank. An air pump integrated in the liquid level
transmitter pumps air into the bell or tube via a hose for 10 seconds every 50 seconds.

The air pressure at the bottom edge of the immersion bell or at the end of the immersion
tube following the injection of air is equal to the pressure generated by the liquid. The air
pressure in the immersion bell or immersion tube is measured by a pressure sensor
integrated in the liquid level transmitter and converted into a load-independent current
signal of between 4 and 20 mA via an integrated current loop transmitter.

Area of application

The PKG 4-20 liquid level transmitter with accessories is suitable/not suitable for use
in the following liquids and/or the following areas:

Suitable for use:
- in clean, low-viscosity liquids (e.g. cooling water) through to soiled liquids with high solid
content (e.g. milk of lime) in non-pressurised open tanks or shafts.

Not suitable for use:
- in liquids which, due to deposits, bonding or crystallisation, might prevent the injection of
air into the immersion bell or immersion tube
- in liquids whose viscosity is so high that they do not allow the surplus air bubbles to
escape through the liquid to the top
- in liquids with a tendency to foam
- in liquids that attack the materials used
- in liquid foodstuffs
- in contaminant liquids (as, if the air hose ruptures above the filling level, the suction action
in the hose could allow contaminant liquids to escape)
- in liquids in tanks that are under pressure
- in dusty rooms (as installation site for the PKG 4-20 liquid level transmitter)
- in potentially explosive areas
These units must only be mounted and connected by a qualified specialist personnel.
 
Manufacturer reserves the right to alter the design and the technical data at his own discretion.
 

The details in this brochure are product specification descriptions and do not constitute assured properties in the legal sense.
 

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