A fluid immersion control system may use a common electrode along with a plurality of sensor electrodes at a distal portion of an immersion microscope objective to monitor electrical resistance of a fluid as an indication of presence of a fluid layer used for immersion microscopy. The fluid immersion control system may activate replenishment of the fluid when the resistance indicates that a diameter of the microscope objective is not immersed in the fluid.

A fluid immersion control system may use a common electrode along with a plurality of sensor electrodes at a distal portion of an immersion microscope objective to monitor electrical resistance of a fluid as an indication of presence of a fluid layer used for immersion microscopy. The fluid immersion control system may activate replenishment of the fluid when the resistance indicates that a diameter of the microscope objective is not immersed in the fluid.

An irrigation system for use with a spa includes a water heating circuit, an automatic water fill valve connected to a water source, and an irrigation pump in fluid communication with the spa through a first irrigation line and electrically connected to a power source through a switch arrangement. The irrigation pump is adapted to pump water to at least one irrigation head. The automatic water fill valve then refills the spa from the water source. The system may include a fertilizer injector, a skin-product injector, a water softener, and various sensors running through an irrigation application on a smart phone to control the irrigation system and operation of the spa.

An irrigation system for use with a spa includes a water heating circuit, an automatic water fill valve connected to a water source, and an irrigation pump in fluid communication with the spa through a first irrigation line and electrically connected to a power source through a switch arrangement. The irrigation pump is adapted to pump water to at least one irrigation head. The automatic water fill valve then refills the spa from the water source. The system may include a fertilizer injector, a skin-product injector, a water softener, and various sensors running through an irrigation application on a smart phone to control the irrigation system and operation of the spa.

An accumulator assembly having a wastewater retention tank defining an interior chamber. A fluid level sensor is coupled to the waste retention tank and configured to sense a level of liquid in the chamber. An extraction pipe extends into the chamber and is coupled to an extraction valve. Coupled to the fluid sensor is a controller that is also coupled to the fluid level sensor and to the extraction valve. The controller is configured to open the extraction valve upon receipt of a signal from the sensor. The accumulator assembly also includes an odor mitigation subassembly in fluid communication with the chamber. The odor mitigation subassembly further includes an air displacement port, an odor filter and an overflow prevention device, the overflow prevention device being in fluid communication with the chamber and located downstream of the air displacement port and upstream of the filter.

A plant cultivating apparatus includes a body that defines a cultivation chamber, a cultivation bed disposed on the cultivation chamber and configured to move relative to the body, a nutrient storage configured to store nutrient solution, a pipe configured to supply the nutrient solution to the cultivation bed, a bed checker configured to detect movement of the cultivation bed, a level checker configured to detect a level of nutrient solution in the cultivation bed, and a controller configured to receive a signal from the bed checker and the level checker and to adjust the nutrient solution supplied to the cultivation bed. The cultivation bed includes a signal connector that is disposed on one surface of the cultivation bed corresponding to the bed checker and the level checker and that is selectively connected to the bed checker and the level checker according to whether to move the cultivation bed.

A plant cultivating apparatus includes a body that defines a cultivation chamber, a cultivation bed disposed on the cultivation chamber and configured to move relative to the body, a nutrient storage configured to store nutrient solution, a pipe configured to supply the nutrient solution to the cultivation bed, a bed checker configured to detect movement of the cultivation bed, a level checker configured to detect a level of nutrient solution in the cultivation bed, and a controller configured to receive a signal from the bed checker and the level checker and to adjust the nutrient solution supplied to the cultivation bed. The cultivation bed includes a signal connector that is disposed on one surface of the cultivation bed corresponding to the bed checker and the level checker and that is selectively connected to the bed checker and the level checker according to whether to move the cultivation bed.

A method and system to precision dose a fluid system with an injection fluid having chemicals is provided. The method and system includes providing a buffered dosing tank of a known geometry between a source tank and an injection pump. The fluid level detector measures the pressure of the dosing tank to determine a fluid level. The fluid level together with the known geometry allow for a controller to calculate a fluid volume in the dosing tank and a change of volume over time. Using the change of volume over time, the controller can calculate an actual dose rate and adjust a speed or duty cycle of the injection pump such that the actual dose rate is approximately the target dose rate.

A method and system to precision dose a fluid system with an injection fluid having chemicals is provided. The method and system includes providing a buffered dosing tank of a known geometry between a source tank and an injection pump. The fluid level detector measures the pressure of the dosing tank to determine a fluid level. The fluid level together with the known geometry allow for a controller to calculate a fluid volume in the dosing tank and a change of volume over time. Using the change of volume over time, the controller can calculate an actual dose rate and adjust a speed or duty cycle of the injection pump such that the actual dose rate is approximately the target dose rate.

An ice maker includes a refrigeration system, a water system, and a control system. The control system includes an air fitting disposed above the sump of the water system, a pneumatic tube, and a controller including a processor and an air pressure sensor. The air fitting defines a chamber in which air may be trapped and includes one or more openings through which water in the sump is in fluid communication with the air in the chamber. The pneumatic tube is in fluid communication with the air pressure sensor and the air fitting. The air pressure sensor is adapted to sense a pressure corresponding to a sump water level. The controller is adapted to control the operation of the refrigeration system and the operation of the water system based upon the sump water level. To avoid errors in water level measurements due to temperature changes, the system uses the pressure sensor data's noise level to detect when the water level reaches the bottom of the air fitting.