What information is needed to select a suitable Pressure Switch?

Answering the eleven basic questions below will make the selection process much quicker and will ensure you get a switch that meets your expectations and is a suitable pressure switch for the application.

 

11 Questions

#1 – What is the pump motor horsepower (HP)  = ½ HP

#2 – What is the pump motor voltage (V) 110/115, 220/230, 460/575 = 110 VAC

#3 – What is the power phase (Ph Single (1 Ph), Polyphase (3 Ph) or direct Current (DC) =

#4 – Action type (A) Standard Action – Contacts Normally Open (NO) vs. Reverse Action “R”  -  Contacts Normally Closed (NC) = Standard

#5 – Desired pressure setting – PSI for Pump on and Pump Off (Note the differential will need to be with in the switches limitations)= ?

Standard Action

Cut-In Pressure (Pump Start) Contacts close on falling pressure. =  

Cut-Out (Pump Stop) Contacts open on rising pressure =

Reverse Action -   https://support.boshart.com/what-is-a-reverse-acting-pressure-switch

Cut-In Pressure (Pump Start) Contacts close on rising pressure. = 

Cut-Out (Pump Stop) Contacts open on falling pressure  =

#6 – Connection type / size

#7 - Encloser type – NEMA Type 1 General Purpose, NEMA Type 3R Rainproof, NEMA Type 4 Watertight, NEMA Type & & 9 Hazardous Locations =

#8 - Media Temperature Range (Min. – Max)

#9 - Ambient Temperature Range (Min. – Max)

#10 - Do you need any unique features listed below Yes - NO? If yes =

  • Maintained Manual Cut-Out Lever (AUTO-OFF)
  • Maintained Manual Cut-In Lever (AUTO-ON)
  • Three-Way Lever (ON-AUTO-OFF)                                          
  • Low Pressure Cut-Off (AUTO-START-OFF) Operates at Approximately 10 PSI Below Cut-in and will turn off the pump https://support.boshart.com/what-is-a-pressure-switch-with-low-pressure-cut-off-feature
  • Pulsation Plug                                 
  • 2-Way Pressure Release  (Unloader) Valve                                         
  • Plastic Flange (max. temp. 120°F) (max. pressure 80 psi - 1/4" FPT only)                                
  • One Normally Open - One normally closed Contact                                        
  • Pilot Light - Indicates Contacts Closed                                   
  • Other - Please Specify                                  

#11 – Do you have a brand preference- BOSHART – SQUARE D – FURNAS / HUBBELL – Does not Matter? =

Most pressure switches are field adjustable, if you need to adjust a switch, please visit the link below.

https://support.boshart.com/how-do-i-adjust-a-pressure-switch