Choosing the Right United Electric Differential Pressure Switch

Below is a quick side-by-side spec comparison to help you find the right UE pressure, differential pressure, or temperature switch for your application.

Key: standard= Standard feature. optional= Optional.

Differential Pressure Switch J21K 24
Delta Pro		 100 400 120 Spectra 12 One Series
Enclosure Rating and Construction
NEMA 1 General Service standard            
NEMA 4   standard          
NEMA 4X Watertight     standard standard standard standard standard
NEMA 7         optional standard  
NEMA 9     standard   optional standard  
Division 1 Hazardous Environments         standard standard  
Division 2 Hazardous Environments         standard   standard
Sanitary     optional   optional    
Switch Output
One SPST             standard
One SPDT standard standard standard standard standard    
DPDT     optional   optional standard  
Two SPDT       standard standard standard  
Three SPDT       standard      
Hermetically Sealed SPDT or DPDT         optional standard  
MOSFET/Solid State Relay             standard
Adjustment
External Adjustment         standard    
Internal Adjustment     standard standard standard    
Reference Scale/Dial     standard standard standard    
Sensor Type
Welded Stainless Steel standard   standard standard standard   standard
Elastomer Diaphragm     standard standard standard    
Brass/Bronze Bellows standard   standard standard standard    
Piston standard     standard standard