|Internal Mechanical Limit Switch|
|Internal Magnetic Limit Switch|
When applying limit switches on industrial valve application one should consider the following:
- Environment - is the limit switch in an area where there may be dust, spray-down, rain, corrosive gasses, combustible gases, or require sanitary conditions. Choosing the correct NEMA classification is critical.
- The electrical rating of the signal being transmitted. AC or DC? High voltage or low?
- Operation Frequency and Cycle life - will the switch only open/close occasionally, or will it cycle every few seconds? Mechanical switches have inherently shorter cycle lives than do proximity or magnetic switches. Choose the best switch considering load and cycle life.
- Visual indication - do you need to see the valve status from a distance?
- Auxiliary outputs - besides opening of closing the primary signal, are their other signals you must send by using additional switches in the housing.