The float level switch B-1 is used to keep between 2 points the level of liquid like water, oil, chemical products, etc., conductive or not, in tanks or recipients at atmospheric pressure.

The float of the model B-1 2P is designed to can be introduced into the normally thread socket 2 " of the fuel or oil tanks and deposits.

The B-1 bases its work due to the movement of a float. When the level of liquid rises up, the float reaches the mechanical stop and pull up the lower counterweight. This enables the action of the lever and reverses the position of the switch.

The adjustment of the commutation of the switch is obtained adjusting the mechanical stops at the desired cable point. If the float is blocked with the mechanical stops, it can be obtained only one punctual signal.

It is simple: the float must be vertically installed on the top of the tank with an appropiate support to fix it. The tank can have a cap to preserve the liquid against dust. Just a little hole in the cap allows the free movement of the cable.


Approximate measures given in mm.

Technical data

NameFloat switch
TypeB-1 – ref: 2505
B-1 2P – ref: 2505-2P
Cable lengthStandard 2.000 mm
(Other lenghts under request)
Product densityB-1– 0,5 Kg/l
B-1 2P – 0,7 Kg/l
Tank pressureAtmospherical
Cable entry3 of M20x1,5
Switching voltage240 V AC
Switching function1 NO + 1 NC Double-Pole Double-Throw (DPDT)
Capacity of the contact3 A / 240 V AC (for resistive loads)
For inductive or capacitive loads, reduce at 50%
Liquid temperature-20° C – +300° C
Switch temperature-20° C – +70° C
ProtectionIP66 according to DIN EN60529
Weight0,30 Kg
Float weightB-1 – 0.18 Kg
B-1 2P – 0.10 Kg
Counterweight weight0,16 Kg
FloatStainless Steel 1.4401
CounterweightStainless Steel 1.4305
Mechanical stopsStainless Steel AISI 1.4305
CableStainless Steel 1.4401

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