Embodiments of the present disclosure provide a method and a smart gas Internet of Things (IoT) system for remote control of an ultrasonic metering device. The method is implemented based on a smart gas device management platform of the IoT system and comprises: obtaining metering data of at least one ultrasonic metering device; determining any one of the at least one ultrasonic metering device as a current metering device; determining an accuracy of the current metering device through verifying the current metering device based on metering data of the current metering device and metering data of a related metering device; and sending an adjustment instruction to a target metering device based on the accuracy of at least one current metering device corresponding to the at least one ultrasonic metering device.

In order to provide a fluid device that makes it possible for operation command signals other than existing operation command signals to be received without a software modification having to be implemented in an already constructed system, in a fluid device that measures or controls physical quantities of a fluid, there are provided a command signal receiving unit that receives a predetermined plurality of types of operation command signals, and also command signal modes, which are values thereof or time series variations of the values thereof, and a command signal recognition unit that, when the command signal mode of a predetermined operation command signal received by the command signal receiving unit falls outside predetermined conditions that have been set in advance, recognizes the predetermined operation command signal that contains the command signal mode as being a different type of operation command signal.

The embodiments of the present disclosure provide a method and system for monitoring ultrasonic metering based on smart gas Internet of Things implemented based on a system for monitoring ultrasonic metering, the system includes a smart gas user platform, a smart gas service platform, a smart gas device management platform, a smart gas sensor network platform, and a smart gas object platform that are connected in sequence. The method includes: in response to a query instruction issued by the smart gas user platform, obtaining target monitoring data at a target time point, a first monitoring data sequence within a first preset time period, and a second preset time period within a second preset time period; judging whether the target monitoring data being interference data through an interference data determination model; and in response to the target monitoring data being the interference data, performing interference processing on the interference data.

Safety monitoring systems and methods include a mesh communications network and an EVC (Electronic Volume Corrector) installed in one or more gas distribution components and/or industrial metering components in a gas distribution station and/or an industrial metering station. A group of sensors can be configured, which includes, for example, a gas leak sensor, a pressure transducer, a temperature transducer, an intrusion sensor and/or other types of sensors. Such sensors can be located within the gas distribution station and/or industrial metering station. The sensors communicate wirelessly with the EVC and the gas distribution and/or industrial metering components through the mesh communications network.

The invention relates to methods for verification of correct function of sampling equipment is disclosed, wherein said method comprises the steps of: a) providing a pump assembly (1) comprising an inlet (2) and an outlet (3), a flow channel (4) extending between said inlet (2) and outlet (3), a pump located along said flow channel (4) adapted to force an gas flow through said flow channel (4), a first mass flow sensor (6) located inside said flow channel (4), a first pressure sensor (7) located near said first mass flow sensor (6) adapted to measure a first pressure inside said flow channel (4), and a second pressure sensor (8) located outside said flow channel (4), said second pressure sensor (8) being adapted to measure a second pressure being the ambient atmospheric pressure, b) calculating the pressure difference between said first pressure and said second pressure c) calculating any error in an output signal from the mass flow meter by comparing said pressure difference with a value in a pre-calibrated table of mass flow output signal values as a function of said pressure difference, d) providing an error signal comprising a value of said calculated error if said value of said calculated error is above a predetermined threshold. The invention further relates to alternatives to said method.

A thermal type flowmeter includes a sensor, a correcting unit, and a flow-rate calculating unit. The sensor outputs a sensor value (first value) corresponding to the state of thermal if fusion in a fluid heated by a heater which is being driven in such a manner that the difference between the temperature of the heater and the temperature of the fluid at a location free from thermal influence of the heater is equal to a predetermined temperature difference. The correcting unit calculates a corrected sensor value (second value) by correcting the sensor value output by the sensor, in accordance with the temperature of the fluid, and outputs the corrected sensor value. The flow-rate calculating unit calculates the flow rate of the fluid from the corrected sensor value calculated by the correcting unit.

Flow measurement device includes flow rate measurement unit, arithmetic unit that calculates a difference value between a the first flow rate value and a second flow rate value, and difference value conversion unit that calculates a flow rate ratio, based on the difference value. In addition, flow measurement device includes appliance characteristic extraction unit that extracts at least one appliance characteristic quantity indicating a characteristic of a flow rate change, and that extracts a value calculated from a first flow rate value and a second flow rate value, as at least one appliance characteristic quantity, in a case where the flow rate ratio falls within a reference range. Furthermore, flow measurement device includes appliance inherent characteristic information holding unit that holds one or more appliance inherent characteristic quantities indicating a characteristic flow rate state of a specific gas appliance, and appliance discrimination unit that discriminates a gas appliance, based on a comparison between the appliance characteristic quantity and the appliance inherent characteristic quantity.

A gas supply system includes a flow controller, a first shutoff valve provided downstream of the flow controller, a second shutoff valve provided in a first flow passage communicating with the downstream side of the first shutoff valve, a second flow passage branching from the first flow passage, a third shutoff valve provided in the second flow passage, a pressure sensor that detects a pressure in a flow passage surrounded by the first, second, and third shutoff valves, a temperature sensor that detects a temperature in the flow passage, a volume measuring tank having a known volume connected downstream of the third shutoff valve, and a controller that obtains a volume of the flow passage by applying Boyle's law to open and closed states of the third shutoff valve and calculates the flow rate using the passage volume and outputs of the pressure and temperature sensors.

Provided are a heater that heats a fluid, and a temperature detector that detects a temperature of the fluid, and a flow rate of the fluid flowing through a main channel is corrected based on a tendency of a detection value detected by the temperature detector to change over time.

A mass flow control system can be self verified for its accuracy when controlling a flow to a process. The system comprises: a control valve for controlling the flow of fluid through the system as a function of a control signal; a controller for generating the control signal as a function of measured flow of fluid through the system and a targeted flow set point; a pressure sensor for measuring the controlling fluid pressure for use in measuring and verifying the flow rate; and a source of fluid for providing a known volume of fluid for use in verifying the system accuracy anytime between steps of the flow control process.