I am trying to build a circuit using relays to fill a tank. The tank will have two float switches. The lower float switch will control the amount of water going into the tank. The upper float switch will control the amount of concentrate going into the tank.
The water is controlled by a solenoid valve. The concentrate is controlled by a pneumatic pump with the air controlled by a solenoid valve, as well as a solenoid valve on the concentrate pipe to prevent siphoning.
The process should be as follows: When the start button is pressed, if the lower level is not reached the water valve is activated and the tank fills with water. When/If the lower level is reached then the water valve is closed and the air valve opens and starts the pump and the concentrate solenoid valve opens. When the upper level is reached all valves close and the process stops. If the stop button is pressed at any time, all valves close and the process stops. If the process is stopped in this manner, when the start button is pressed again, the process needs to start in the correct part of the sequence.
I have a 110ACto 24DC transformer and several 4PDT relays that I would like to use, if possible. The float switches I have only have one set of contacts, and will function as NO or NC depending on which way they are installed.
Attached is a sketch of my installation.
The water is controlled by a solenoid valve. The concentrate is controlled by a pneumatic pump with the air controlled by a solenoid valve, as well as a solenoid valve on the concentrate pipe to prevent siphoning.
The process should be as follows: When the start button is pressed, if the lower level is not reached the water valve is activated and the tank fills with water. When/If the lower level is reached then the water valve is closed and the air valve opens and starts the pump and the concentrate solenoid valve opens. When the upper level is reached all valves close and the process stops. If the stop button is pressed at any time, all valves close and the process stops. If the process is stopped in this manner, when the start button is pressed again, the process needs to start in the correct part of the sequence.
I have a 110ACto 24DC transformer and several 4PDT relays that I would like to use, if possible. The float switches I have only have one set of contacts, and will function as NO or NC depending on which way they are installed.
Attached is a sketch of my installation.