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D-67466 Lambrecht
Phone: +49 63 25 / 188-01
 
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Liquid level indicator

TSQ 4-20/EW/E 5/7,5


  
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.


Float suitable for use in liquids with a specific gravity >=0.7 g/cm³
Brochure Continuous liquid level measuring with liquid level transmitter TSQ 4-20/… and TSK 4-20/… [PDF]
Sensor

Probe tube material		 stainless steel 316 Ti
Probe tube diameter max. 20 mm
Probe tube length max. 1,500 mm
Screw-in nippel material stainless steel 316 Ti
Screw-in nippel dimension G1
Float material stainless steel 316 Ti
Float form ball float
Float diameter 97 mm
Terminal box 
A 307 made of PP, 120 x 80 x 55 mm, 
protection class IP 65
Mounting orientation vertical
Mounting from the top
Temperature application
range		 
- 20° C to + 80° C
Pressure resistance 
max. 12 bar at + 20° C
Measuring principle 
the magnet of the float activates switchable 
series-connected resistances via reed contacts. 
This provides a quasi-continuous height-proportional 
measuring signal

Measuring precision:
7.5 mm distance between 2 reed contacts
Transmitter 
Measuring electronics: 2 wires (independent of polarity)
Setting possibility: 0% value not adjustable,
100 % value adjustable via a potentiometer
Power supply: DC 15 - 30 V (independent of polarity)
Measuring signal: 4 ... 20 mA
Admiss. load in the current loop:
max. 200 ohm at 15 V;
max. 900 ohm at 30 V
Connecting terminals:
for max. 2.5 mm² solid cable or max. 1.5 mm² flexible cable
 
Probe tube length: 
according to customer specification taking into account the probe tube length.

Screw-in nipple: 
on request G1½ or G2; on request with reducing nipple made of cast iron R1½ 
or R2 conical or cast steel G2

Measuring:
precision to be specified: ... mm distance between 2 reed contacts 
(additional type designation):
- 3.75
- 7.5
 
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 series-connected 
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 height-proportional 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.


EMC: for interference emission in accordance with the appliance-specific requirements for 
households, business and commerce as well as small companies, and for interference 
immunity in accordance with the appliance-specific requirements for industrial companies.

 
Measure drawing
Basic circuit
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