SOR® mechanical level switches are rugged, industrial products specifically designed for versatility of application. This 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 switch include: switch type and number, housing type, chamber material, process connections, accessories, and more. Units may be customized to suit customers’ needs.
These switches utilize a float or a displacer to operate the switching mechanism.
Configuration choices are available for:
- Chamber material - Material used for chamber
- Process connections - for flanged or NPT connections
- Trim material - for different materials used for the float/displacer
- Switching mechanism - for different AC/DC ratings and temperature thresholds
- Housings - for General Purpose or Explosion Proof capabilities
- Accessories - For miscellaneous such as Certificates, Special Coatings, Additional Tests, Manual Check options
There are several types of Chambered Level Switches available:
- Float-Operated Level Switches - Vertical
- Float-Operated Level Switches - Horizontal
- Displacer-Operated Level Switches
The 1710 Compact Level Switch is also available as a float-operated level switch. However, its chamber is optional.
For more information on this compact level switch, download 1710 Side Mounted Level Switch (Form CAT864).
For more information, download Level Switches (Form CAT912).
Float-Operation Level Switches - Vertical
Model Series 100, 200 and 300
The 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 two switching elements. Independent switching levels may be obtained with tandem floats.
Float-Operated Level Switches - Horizontal
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.
Displacer-Operated Level Switches
|Model Series 700, 730, 740, 750 and 800
Displacer 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.
The 1710 Compact Level Switches
1710 is a horizontally oriented, float-operated level switch suitable for plant and OEM applications where open or closed contacts are required to signal the presence or absence of liquid at a discrete level. The float extension arm moves a magnet which actuates (de-actuates) an electromechanical switching element.
The 1710 unit allows for a smaller installation foot print, making it more compact and economical than most traditional vertical chambers. Although the 1710 is more compact, it provides the rugged reliability customers have come to expect from SOR.
The design starts with a high pressure float counter-weighted with a magnet. The magnet is coupled with another magnet inside the housing which is attached to the switching mechanism. The key is that the two magnets are separated by a pressure retaining wall of non-magnetic material. The magnets interact with each other as the float goes up and down, providing a safe and reliable system you can depend on for the most critical of applications.