And if something catches fire while there s excess pressure valves controlling the supply of water to sprinklers may not open on time.
Low pressure switch vs pressure switch.
Essentially they work by converting the positive pressure signal to an electrical output thus only responding to changes in the positive pressure chamber.
Low cost differential pressure switch.
The low water pressure switch attachment drops to turn off the pump when it loses its prime and the pressure drops to a specific low pressure cut off point.
A pressure switch is a device that can measure pressure electromechanically in a process pressure switch can complete the function of on and or off when a pressure reaches the given limited high or low points that predefined in case of that the switch can open or close contact or break a circuit and move into one of two positions by the pressure of medium it measured.
That added pressure could damage pressure activated valves and other components in fire sprinkler systems.
Square d by schneider electric 9013fsg2j24m4 air pump pressure switch nema 1 40 60 psi pressure setting 20 65 psi cut out 15 30 psi adjustable differential low pressure cut off 4 6 out of 5 stars 189.
Low pressure cut off pressure switches turn the pumps off if the water pressure dips below 15 psi.
Thus the switch is designed to respond only changes in the negative pressure chamber.
These switches can handle higher temperatures than other medium pressure switches.
They electrically activate automated controls or alarms when a set pressure is reached.
They can be wired normally open no or normally closed nc.
Negative low pressure switches function by converting the negative pressure signal to an electrical output.
Switches are single pole double throw spdt so they switch one circuit on or off.
The low pressure shut off switches are available with low pressure cut off point of approximately 8 to 10 lbs.
Shop for pressure switches and other water pump accessories in our online store.
Positive low pressure switches function in much the same way.
Switches for high and low air pressure play the same role but also detect increases in pressure.
Epd1s series differential pressure compact economical stripped can be used for high low limit control working ranges from 22 150 psi set point range from 22 40 psi.
In this video tutorial we explain how these switches work and the pros and cons in using them with your pump installation.