SOR Mechanical Level Switch

Models 100, 200, 300, 108/208, 400, 700, 730, 740, 750 and 800

Float and Displacer Operated Level Switch

SOR Mechanical Level Switch Product imageThe SOR mechanical level switch is a rugged, industrial product specifically designed for versatility of application. The downloadable PDF  catalog contains application and ordering data for float and displacer operated level switches. Switches are available with flanged or sealed chambers or as insertion models.

Options available for each type of mechanical level switch include: switch type and number, housing type, chamber material, process connections, accessories, and more. Units may be customized to suit customers’ needs.

Inside this catalog you will find solutions to your level sensing puzzles. SOR mechanical level switches have many configurations available. If you don’t see what you need, we will engineer a solution for your application.

Features and Benefits

  • Five-year warranty
  • ASME Section IX and AWS qualified welding system
  • Designed to ANSI/ASME B31.1 and B31.3 guidelines
  • Hermetically sealed switching mechanisms available
  • Stainless steel switching mechanisms
  • High-temperature capability
  • Wide variety of explosion-proof housings
  • Versatile switching mechanisms which retro-fit into other manufacturers’ units
  • Worldwide listings and certifications
  • Quick worldwide delivery
  • Only ASTM grade materials with certified mill test reports used

Safety Certified to IEC 61508 (SIL) SOR products are certified to IEC 61508 for non-redundant use in SIL1 and SIL2 Safety Instrumented Systems for most models. For more details or values applicable to a specific product, see the Safety Integrity Level Quick Guide (Form 1528).

Float-Operated Level Switches Model Series 100, 200 and 300

SOR Mechanical Level Switch Specification 1The float rides on the process liquid surface, precisely tracking liquid surface motion.

Rising liquid level lifts the float, sliding the attraction sleeve up inside the enclosing tube and into the magnetic field to actuate the electrical or pneumatic switch (signaling liquid presence).

Subsequently, falling liquid level lowers the float, drawing the attraction sleeve out of the magnetic field to deactuate the electrical or pneumatic switch (signaling liquid absence). Float-type level switches are generally able to handle high-temperature applications, and sometimes prove useful for close interface detection.

Floats can operate up to three switching elements. Independent switching levels may be obtained with tandem floats. Consult the factory for special float switching arrangements.

Float-Operated Level Switches Model Series 108/208 and 400

The float rides on the process liquid surface, precisely tracking liquid surface motion.

Rising liquid level lifts the float via a pivot mechanism, sliding the attraction sleeve down inside the enclosing tube and out of the magnetic field to deactuate the electrical or pneumatic switch (signaling liquid presence).

Subsequently, falling liquid level lowers the float, drawing the attraction sleeve into the magnetic field to actuate the electrical or pneumatic switch (signaling liquid absence). Float-type level switches are generally able to handle high-temperature applications.

SOR Mechanical Level Switch Specification 2

Displacer-Operated Level Switches Model Series 700, 730, 740, 750 and 800

SOR Mechanical Level Switch Specification 3Displacer controls offer alternative features to the float-operated control. The sensor is a weight (displacer), heavier than the liquid, that is suspended by a spring. When liquid contacts the displacer, a buoyancy force is produced, which causes the effective weight of the displacer to change. This causes the spring to retract slightly to a new equilibrium position. When the spring retracts, the attraction sleeve also moves upward into the field of the external magnet, thus overcoming the force of the bias spring and actuating the switching element.

This principle provides for narrow or wide switching differential, and allows switching point alteration by moving the displacer(s) up or down the suspension cables.

Displacers may be arranged in combinations of narrow and wide differential to operate up to three switching stages. Displacer controls operate under higher pressure conditions than float-operated switches.

 Download SOR Mechanical Level Switch Specifications (PDF)
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