Features 
 BK-1/EX liquid level switches are used in magnetic level gauge on the column turned the most reliable, practical level switch uses BURGESS company special days off, the magnetic drive cam so that the liquid level switch has a bistable state of memory write function. Switch board installed in the magnetic cylinder turned, and the level gauge in the same magnetic coupling system, no contact with the process media, high temperature, explosion-proof and shock protection. 

 Structure principle 
 Turned columns installed in the magnetic level gauge and level switch on the panel at the same level gauge magnetic coupling system, the level gauge float tube leading change with the liquid level moves up and down, bottom-up approach when the float level switch , float the magnetic field generated within the magnet switches and level repulsion in the magnetic field produced by magnets, the magnets push and level switches connected to drive the switching cam swing, float continues to rise, so do not switch to maintain the status change, down close to the level switch, magnetic repulsion between the switch again to convert the state level to promote and maintain, it has a bistable memory switch. Products use special switches, contacts, large capacity, high-power devices can directly drive is used in magnetic level gauge on the column turned the most practical and reliable additional control or alarm device. 

 Technical parameters 
 Switch Type: cam-driven switch, single pole double throw, with shock protection. 
 Contact capacity: 10A 250V AC 
 0.6A 125V DC 
 0.3A 250V DC 
 Operating temperature: -50 ~ 180 ℃, with a special installation and insulation attachment, process temperature up to 420 ℃ 
 Protection class: IP65 
 Explosion-proof mark: intrinsically safe: Exib Ⅱ CT4 
 Flameproof: Exd Ⅱ BT4 
 Electrical connection: M20 * 1.5 thread