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Home > Models A10/A15 Single Stage Displacer Switches
 Models A10/A15 Single Stage Displacer Switches   Printer Friendly Version
Single Stage displacer switches utilize one electrical control mechanism and are factory calibrated.

Series A10 are wide differential units calibrated to actuate as a liquid level reaches a given displacer and to deactuate when the level reaches a second displacer.

The minimum differential band is approximately 6 inches (152 mm) in water and varies somewhat with liquid specific gravity. The maximum differential is determined by the length of the displacer suspension cable.

Series A15 are calibrated to operate over a narrow level differential band and are ideally suited for liquid level alarm applications on either high or low level.

The operating level is fully adjustable simply by repositioning the displacer along its suspension cable. The differential band varies slightly with liquid specific gravity.
Operating Principle Features Industries Options Downloads Approvals
 
Operation is based upon simple buoyancy, whereby a spring is loaded with weighted displacers which are heavier than the liquid. Immersion of the displacers in the liquid results in buoyancy force changing to net force acting on the spring. The spring compresses as the buoyancy force increases.

A magnetic sleeve is connected to the spring and operates within a non-magnetic barrier tube. Spring movement causes the magnetic sleeve to move into the field of a pivoted magnet, actuating a switch mechanism located outside the barrier tube. Built-in limit stops prevent over stroking of the spring, under level surge conditions.

 

  • Narrow or wide level range capabilities
  • A variety of displacer materials available
  • Field-adjustable set point and switch differential
   

  • Electric or pneumatic switch mechanisms and enclosures
  • Displacer cable length
  • Materials of construction
  • Tank connection
  • Floating roof detection
  • Proof-er ground checker control
 
 Literature: (US English)
  Electric Switch Manual
  J Series Pneumatic Switch
  Series K Pneumatic Switch
  Hermetically Sealed Switches
  Sales Literature
  Instruction Manual
  Technology Brochure
  Test Report FMEDA
  SIL Brochure
  R Series High Temp Switch

  
  • XP   

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  • XP   

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  • ELV   
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  • XP   

  • IS   

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  • YES   
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    XP = Explosion Proof  •  IS = Intrinsically Safe  •  NI = Non-Incendive  •  NS = Non-Sparking  •  ELV = EMC/Low Voltage