Patent ID: 7740399

Claim:
A dry chemical feeder system for dispensing dry chemical and converting the dry chemical into a chemical mixed solution, the dry chemical feeder system comprising: a hopper for receiving the dry chemical, a feed tube joined to the hopper, a mixing tank with the feed tube extending into the mixing tank, a first solenoid actuator operatively associated with a first solenoid actuated gate disposed in the feed tube, a second solenoid actuator operatively associated with a second solenoid actuated gate disposed in the feed tube below the first solenoid actuated gate, high and low liquid level sensors disposed in the mixing tank with the high liquid level sensor being disposed above the low liquid level sensor, a process water inlet pipe having a solenoid valve that is joined to the mixing tank for delivering process water to the mixing tank, a mixing tank outlet pipe joined at one end to the mixing tank and joined at the other end to a metering pump and the metering pump for pumping the chemical mixed solution out of the mixing tank through the mixing tank outlet pipe, and a central controller having a microprocessor in communication with and for sending command signals to the first and second solenoid actuators and the solenoid valve to control the delivery of dry chemical and process water into the mixing tank, and the central controller is in communication with the high and low liquid level sensors for receiving and processing information regarding the level of chemical mixed solution in the mixing tank, and the central controller is in communication with the metering pump to control the pumping of the chemical mixed solution out of the mixing tank based on signals received from the high and low liquid level sensors.