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D-67466 Lambrecht
Phone: +49 63 25 / 188-01
 
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Continuous liquid level measurement with
TSQ 4-20/... and TSK 4-20/...
for remote transmission of liquid levels using the float method
 
 

TSQ 4-20/... liquid level indicators
consisting of
- sensor:
  Switchable resistances activated by float via reed contacts.

- transmitter:
  A 2-wire module in the terminal box of the liquid level indicator converts the resistance
  values into a load-independent current signal 4 ... 20 mA.
 

Working principle
A float with built-in permanent magnet moves up and down with
the liquid level on the probe tube
of the TSQ 4-20/... liquid level
indicator.

Inside the probe tube, there is a chain made up of reed contacts and seriesconnected resistors.

The magnet in the float switches the reed contact(s) which
are at the same position as the float. This results in quasi-
continuous heightproportional
resistance measurement.

The change in resistance resulting from the upward and downward motion of the float is recorded via a current loop transmitter in the terminal box of the TSQ 4-20/... liquid level indicator and converted into a load-independent current 4 ... 20 mA.
 

Area of application
The TSQ 4-20/... liquid level indicator is designed for use in low-viscosity liquids or liquids with
only low solid content in open or closed tanks. It is not suitable for use in liquids that are
prone to deposit formation, adhesion or crystallisation which might hinder the movement of the
 float on the probe tube. It is also not suitable for use in liquids with permanently moving
surface and/or on vibrating machines.
The following types are available, please click on images to enlarge!
 

TSK 4-20/... liquid level indicator
Consisting of
- sensor:
   Potentiometer adjusted by float via a transmission chain.

- transmitter:
  A 2-wire module in the terminal box of the liquid level indicator converts the potentiometer
  position into a load-independent current signal 4...20 mA.
 

Mode of operation
A float with built-in permanent magnet moves up and down on the probe tube of the
TSK 4-20/... liquid level indicator with the liquid level. Inside the robe tube, there is a second magnet integrated in a
circulating endless chain inside the bigger of the two guide tubes. The magnet follows the float magnet and therefore the liquid level. This in turn moves the endless chain, which then acts on a potentiometer via a gear in the terminal box of the TSK 4-20/... liquid level indicator. This results in continuous heightproportional
resistance measurement.

The change in resistance resulting from the upward and downward motion of the float is recorded via a transmitter in the terminal box of the TSK 4-20/... liquid level indicator and converted into
a load-independent current
4 ... 20 mA.
 
Area of application
The TSK 4-20/... liquid level indicator is designed for use in low-viscosity liquids or liquids
with only low solid content in open or closed tanks. It is not suitable for use in liquids that are
prone to deposit formation, adhesion or crystallisation which might hinder the movement of
the float on the probe tube. It is also not suitable for use in liquids with permanently moving
surface and/or on vibrating machines.
 
Kontinuierliche Füllstandsanzeigen
 
SKG 420 switching unit for signalling 1 limit level,
with integrated liquid level indicator feed

ZKG 420 switching unit for level regulation
between 2 limit levels,
with integrated liquid level indicator feed

VKG 420-1020 switching unit for comparison of 2 signals,
with integrated liquid level indicator feed

Indicating instrument
 
 
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.