Most Common Devices in Industrial Plants

The most common limit switch or visual position indicator found in process plants meet one of two basic specifications. Either the device will operate in a general purpose environment where the chief concern is the environmental conditions of the installation. Or as the second application commonly known as is Hazardous Areas where potentially explosive gases and dusts are typically present in normal plant operations.

Environmental Concerns

• General Purpose Type 4, 4x (IP 65/67)
  • Standard on-off indicator in black/yellow or red/green patterns
    
  • Two mechanical SPDT switches, one for each end of travel
    
  • Aluminum Enclosure
    
  • Direct shaft to actuator mounting (for NAMUR ¼ turn actuators)
    
  • Mounted indoors or outdoors
    

• Explosion-Proof Type 4, 4x, 7, 9 (Hazardous Areas – North America)
  • Standard on-off indicator in black/yellow or red/green patterns
    
  • Two mechanical SPDT switches, one for each end of travel
    
  • Aluminum Enclosure
    
  • Direct shaft to actuator mounting (for NAMUR ¼ turn actuators)
    
  • Mounted indoors or outdoors
    

Suitability

Moniteur’s line of limit switches are a quality products that are interchangeable with virtually all of the products found in the market. The products represent a substantial upgrade in terms of general reliability and product longevity from other lines. This is particularly true in harsh environments.