Systems and methods for providing network connectivity and remote monitoring, optimization, and control of pool/spa equipment are provided. “Internet-of-Things” (IoT) functionality is provided for pool and spa equipment in a flexible and cost-effective manner. Network connectivity and remote monitoring/control of pool and spa equipment is provided by various components such as a network communication and local control subsystem installed in pool/spa equipment, and other components. Also disclosed are various control processes (“pool logic”) which can be embodied as software code installed in any of the various embodiments of the present disclosure.

Systems and methods for controlling a fluid-based system are disclosed. The systems and methods may include generating a model output using a model processor, processing a model input vector and setting a model operating mode, and setting dynamic states of the model processor, the dynamic states input to an open loop model based on the model operating mode. Synthesized parameters are generated as a function of the dynamic states and the model input vector based on a series of utilities, where at least one of the utilities is a configurable utility including one or more sub-utilities. An estimated state of the model is determined based on at least one of a prior state and the synthesized parameters. An actuator associated with the control device is directed as a function of a model output, where the model output includes an estimated thrust value for the control device.

Systems and methods for providing network connectivity and remote monitoring, optimization, and control of pool/spa equipment are provided. “Internet-of-Things” (IoT) functionality is provided for pool and spa equipment in a flexible and cost-effective manner. Network connectivity and remote monitoring/control of pool and spa equipment is provided by various components such as a network communication and local control subsystem installed in pool/spa equipment, and other components. Also disclosed are various control processes (“pool logic”) which can be embodied as software code installed in any of the various embodiments of the present disclosure.

Mass flow controllers and methods for controlling mass flow controllers are disclosed. One method includes providing a process gas through a flow sensor of the mass flow controller, obtaining a gas-adjusted sensitivity coefficient for the flow sensor, and obtaining gas-adjusted nonlinearity data for the flow sensor. The method also includes producing gas-adjusted characterization data for the flow sensor using the gas-adjusted sensitivity coefficient and the gas-adjusted nonlinearity data. A flow value from the gas-adjusted characterization data is obtained using a flow sensor signal from the flow sensor, and the flow value is used along with a setpoint signal to control a valve of the mass flow controller.

Disclosed are devices, systems and methods for operation and control of gravity-fed fluid flows in water and wastewater related systems. The disclosed flow control system uses gravity to provide a flow of a fluid from a fluid source and a motorized flow control device fluidically coupled to the fluid source to control a defined flow rate of the flow by changing a position of an internal volume of the flow control device through which the fluid flows relative to a fixed level of the fluid in the fluid source. The disclosed devices, systems and methods can be used in a wide variety of systems for environmental and low-energy demand applications such as, for example, a wastewater treatment system to control a flow of wastewater in the system.

Mass flow controllers and methods for controlling mass flow controllers are disclosed. One method includes providing a process gas through a flow sensor of the mass flow controller, obtaining a gas-adjusted sensitivity coefficient for the flow sensor, and obtaining gas-adjusted nonlinearity data for the flow sensor. The method also includes producing gas-adjusted characterization data for the flow sensor using the gas-adjusted sensitivity coefficient and the gas-adjusted nonlinearity data. A flow value from the gas-adjusted characterization data is obtained using a flow sensor signal from the flow sensor, and the flow value is used along with a setpoint signal to control a valve of the mass flow controller.

An assembly for use with a water meter includes: a housing including a meter portion integrally formed with a valve portion; and a valve positioned in the valve portion and in sealable communication with an inner surface of the housing, the valve defining a valve inlet portion and a valve outlet portion, the valve inlet portion defining a vertical portion and separated from the valve outlet portion by a top edge portion defined in the vertical portion, the valve inlet portion sealable from the valve outlet portion by a diaphragm assembly of the valve, the diaphragm assembly defining a water leak passthrough configured to allow passage of water from a first side of the diaphragm assembly to a second side of the diaphragm assembly opposite from the first side.

For controlling opening (B2) of a valve in an HVAC system to regulate the fluid flow through a thermal energy exchanger and adjust power transfer of the thermal energy exchanger, a control system sets (S6) a control signal for the valve to different setpoints and records (S1) a plurality of data points. Each data point includes for a certain setpoint operating data values related to the power transfer effectuated by the thermal energy exchanger with the control signal set to the certain setpoint. The control system determines (S2) a fitting curve for the data points and determines (S3) a transformation which transforms the fitting curve into a transformed curve having a given target shape. The control system controls (B2) the opening of the valve by transforming (S5) the setpoint to a transformed setpoint, using the transformation, and setting (S6) the control signal for the valve to the transformed setpoint.

A buoyancy method for deploying a plurality of floats of a buoyancy system of an aircraft. The plurality of floats comprises a plurality of main floats and a plurality of secondary floats that are folded in flight. The method comprises a step of deploying the main floats in flight prior to ditching, and a step of deploying the secondary floats after ditching.

An exemplary time fault circuit interrupter for interrupting a power supply to an equipment unit upon the occurrence of a trip condition may include a sensor configured to monitor a current flow to the equipment unit. The circuit interrupter may also include a trip mechanism configured to interrupt the current flow. The circuit interrupter may further include a processor in communication with the sensor and the trip mechanism, and the processor may be configured to cause the trip mechanism to interrupt the current flow when a current flow time has reached a predetermined time limit.