Control of liquids

Float levels switch


Intended use:

The float level switch B-EX 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 where an additional security is required with a end switch suitable to use it in potential explosion zones due to Dust or Gas. 


The B-EX 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. 

Mechanical connection:

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 are given in mm. 




Technical data:

Name Float switch    
Type B-EX ref: 2505-1  
Category <Ex> II 2 GD    
Cable length Standard 2.000 mm
(Other lenghts under request)
Product density 0.5 kg/l    
Tank pressure Atmospherical    
Cable entry 3 of M20x1.5    
Switching voltage 500 V AC / 250 V DC    
Switching function 1 NO + 1 NC Double-Pole Double- Throw (DPDT)    
Capacity of the contact 6 A / 240 V AC
(for resistive loads)
For inductive or capacitive loads, reduce at 50%
Liquid temperature -20 °C ... +60 °C    
Switch temperature -20 °C ... +40 °C    
Protection Gas: Ex d IIC T6
Dust: Ex tD A21 IP66/67 T85 ºC
Weight 0.30 kg    
Float weight 0.23 kg    
Counterweight weight 0.16 kg    
Switch Aluminium    
Float Stainless Steel 1.4401    
Counterweight Stainless Steel 1.4305    
Mechanical stops Stainless Steel AISI 1.4305    
Cable Stainless Steel 1.4401