Model for vertical mounting with Nylon or Popypropylene (PP), Ø 21x30 mm float, 1 NO contact reversible to NC, with extension under request, thread process connection and DIN 43650 output.

These devices are used to control the level in tanks, containers, bypass pipes, ... of liquids like waters, oils, chemical products, ... with non-ferric particles in suspension are used. This model is specially indicated to be control the maximum, minimum or an alarm level in small tanks.

The indicator LRNH-P are the float switches LS with an extension.

The magnetic float switches have an articulated body with a float. Inside the body there is a REED contact that changes its position due to the magnetic field of the magnet placed inside the float when the level of the liquid reaches its level due to the angle deviation of the float.

To reverse the NO contact to NC contact, change the mounting position of the float 180º.

The standard form is mounting the device with the thread connection in the side of the tank or container or through a tube. The thread is G 3/4 " male, and can be fixed introducing it into a threaded socket or using 1 nut.

For a correct use of the level switch, the float must not touch the walls of the tank and it is necessary to ensure the free movement of the float.


Approximate measures given in mm.

Technical data

NameMagnetic float switch
TypeLRNH-31P – ref: 2506-0-P...
LRNH-51P – ref: 2506-1-P...
Body length90 – 1.000 mm (including float VS)
Body diameter Ø 18,5 mm
Number of contacts1
ContactsNO (NC reversing the float)
Position of the contactsMinimum
Capacity of the contact15 W, 0.5 A, 230 V AC (for resistive loads)
For inductive or capacitive loads reduce at 50%
Electrical outputDIN 43650 Connector
Thread Proccess connectionG 3/4”
FloatØ 17x50 mm
Product densityLRNH-31P – 0,85 Kg/l
LRNH-51P – 0,80 Kg/l
ProtectionIP65 according DIN EN60529 with Epoxy resin protection, non-removable contact
Maximum pressure+1 bar
Ambient temperatureLRNH-31P – -30º C – +80º C
LRNH-51P – -30º C – +60º C
Weight0,25 Kg
Body and floatLRNH-31P – Nylon 6.6 blue
LRNH-51P – Polypropylene dark grey
Extension and ThreadPVC

Explore all our level controls

Need more information?