A positive displacement metering system measures the rate of travel of a free piston in a cylinder of known volume to determine the flow rate of a fluid out of the cylinder. The system may also measure and record the inlet and outlet pressures or the differential pressure between the fluid inlet and outlet. The control program positions a four-way valve which may function as an adjustable metering orifice in response to the measured flow rate and/or changes in the inlet and outlet pressures to achieve the desired flow rate. At the end of each stroke, the four-way valve is repositioned to reverse fluid flow through the metering cylinder. The system may revise the valve position settings for both forward and reverse strokes based on the measured time required for a full stroke of the piston within the cylinder at a certain valve position or a measured rate of movement of the free piston.

The present invention relates to a measurement device (10) for measuring a volume of liquid contained in a vessel, comprising: a main vessel (12) for receiving a liquid; a reference vessel (14) which has a smaller volume than the main vessel (12), wherein the main vessel (12) and the reference vessel (14) are fluidly connectable to each other as communicating vessels; a pump (16) which is connected to the main vessel (12) and the reference vessel (14) for extracting liquid from the main vessel (12) and the reference vessel (14); a minimum level sensor (26) which is configured to send a reference signal if a minimum liquid level within the reference vessel (14) is reached; a first valve (20, 20) via which the reference vessel (14) is fluidly connected to the pump (16), wherein the first valve (20, 20) is configured to be closed off if the minimum liquid level within the reference vessel (14) is reached; and a control unit (30) which is connected to the minimum level sensor (26, 26) and the pump (16) and configured to measure a reference time between an activation of the pump (16) and a receipt of the reference signal, wherein the control unit (30) is further configured to calculate, based on the reference time and a flow rate of the pump (16), a liquid volume within the main vessel (12) and/or a total liquid volume within the main vessel (12) and the reference vessel (14) together. has been deleted and The present invention relates to a measurement device (10) for measuring a volume of liquid contained in a vessel, including: a main vessel (12) for receiving a liquid; a reference vessel (14) which has a smaller volume than the main vessel (12), wherein the main vessel (12) and the reference vessel (14) are fluidly connectable to each other as communicating vessels; a pump (16) which is connected to the main vessel (12) and the reference vessel (14) for extracting liquid from the main vessel (12) and the reference vessel (14); a minimum level sensor (26) which is configured to send a reference signal if a minimum liquid level within the reference vessel (14) is reached; a first valve (20, 20) via which the reference vessel (14) is fluidly connected to the pump (16), wherein the first valve (20, 20) is configured to be closed off if the minimum liquid level within the reference vessel (14) is reached; and a control unit (30) which is connected

The present invention relates to a measurement device (10) for measuring a volume of liquid contained in a vessel, comprising: a main vessel (12) for receiving a liquid; a reference vessel (14) which has a smaller volume than the main vessel (12), wherein the main vessel (12) and the reference vessel (14) are fluidly connectable to each other as communicating vessels; a pump (16) which is connected to the main vessel (12) and the reference vessel (14) for extracting liquid from the main vessel (12) and the reference vessel (14); a minimum level sensor (26) which is configured to send a reference signal if a minimum liquid level within the reference vessel (14) is reached; a first valve (20, 20) via which the reference vessel (14) is fluidly connected to the pump (16), wherein the first valve (20, 20) is configured to be closed off if the minimum liquid level within the reference vessel (14) is reached; and a control unit (30) which is connected to the minimum level sensor (26, 26) and the pump (16) and configured to measure a reference time between an activation of the pump (16) and a receipt of the reference signal, wherein the control unit (30) is further configured to calculate, based on the reference time and a flow rate of the pump (16), a liquid volume within the main vessel (12) and/or a total liquid volume within the main vessel (12) and the reference vessel (14) together. has been deleted and The present invention relates to a measurement device (10) for measuring a volume of liquid contained in a vessel, including: a main vessel (12) for receiving a liquid; a reference vessel (14) which has a smaller volume than the main vessel (12), wherein the main vessel (12) and the reference vessel (14) are fluidly connectable to each other as communicating vessels; a pump (16) which is connected to the main vessel (12) and the reference vessel (14) for extracting liquid from the main vessel (12) and the reference vessel (14); a minimum level sensor (26) which is configured to send a reference signal if a minimum liquid level within the reference vessel (14) is reached; a first valve (20, 20) via which the reference vessel (14) is fluidly connected to the pump (16), wherein the first valve (20, 20) is configured to be closed off if the minimum liquid level within the reference vessel (14) is reached; and a control unit (30) which is connected

Provided is a flow measurement system that creates distance information and flow velocity information of each of a plurality of measurement areas in a Field of View (FOV) zone of the surface of a river using radar electromagnetic waves by means of a multipoint radar flow velocity meter and that calculates a flow rate using the distance information and flow velocity information of each of the plurality of measurement areas, and meteorological observation information, level information, etc. of a river by means of an RTU.

A uni-directional drive gear includes a plurality of teeth each pivotably mounted on a mounting seat to be turned between driving and idle positions so as to permit the gear to rotate in a uni-rotational direction. A gear transmission device having the uni-directional drive gear can be configured to perform different transmissions to suit a wide variety of requirements.

A uni-directional drive gear includes a plurality of teeth each pivotably mounted on a mounting seat to be turned between driving and idle positions so as to permit the gear to rotate in a uni-rotational direction. A gear transmission device having the uni-directional drive gear can be configured to perform different transmissions to suit a wide variety of requirements.

An apparatus is provided and includes a rotary encoder that comprises a stator, a rotor, and a controller. The stator has an opening adapted to surround a first portion of a rotatable shaft, a transmit region, and a receive region. The rotor has an opening adapted to surround a second portion of the rotatable shaft, an annular conductive region, and at least one conductor electrically coupled with the annular conductive region. The controller has an input coupled to the receive region and has an output coupled to the transmit region. The controller is configured to transmit a first signal on the output of the controller and to the transmit region of the stator, receive a second signal on the input of the controller and from the receive region of the stator, and determine, based on the second signal, a proximity of the at least one conductor to the receive region.

A gas meter device of the present invention includes an inlet into which a fluid flows, and an outlet from which the fluid flows out, and is configured to derive a flow value of the fluid flowing from the inlet to the outlet. The gas meter device comprises plural measurement fluid passages provided in parallel between the inlet and the outlet; flow value measuring units provided in the plural measurement fluid passages, respectively, and configured to independently measure flow values of fluids flowing through the measurement fluid passages, respectively; an average flow value calculation unit configured to derive an average flow value of the flow values measured by the flow value measuring units, respectively; and a flow value comparison unit configured to obtain index values indicating a relation between the average flow value derived by the average flow value calculation unit and the flow values measured by the flow value measuring units, and determine whether or not each of the index values is equal to or larger than a predetermined value. Thereby, the present invention can determine whether or not there is an erroneous measurement flow value from only the separate flow values independently measured in the measurement fluid passages, respectively.

A gas meter device of the present invention includes an inlet into which a fluid flows, and an outlet from which the fluid flows out, and is configured to derive a flow value of the fluid flowing from the inlet to the outlet. The gas meter device comprises plural measurement fluid passages provided in parallel between the inlet and the outlet; flow value measuring units provided in the plural measurement fluid passages, respectively, and configured to independently measure flow values of fluids flowing through the measurement fluid passages, respectively; an average flow value calculation unit configured to derive an average flow value of the flow values measured by the flow value measuring units, respectively; and a flow value comparison unit configured to obtain index values indicating a relation between the average flow value derived by the average flow value calculation unit and the flow values measured by the flow value measuring units, and determine whether or not each of the index values is equal to or larger than a predetermined value. Thereby, the present invention can determine whether or not there is an erroneous measurement flow value from only the separate flow values independently measured in the measurement fluid passages, respectively.

An apparatus for use with a backup counter module, the apparatus having: a housing having a first end for coupling the housing to a gas meter body, and a second end for coupling an electronic counter module to the housing; and the second end having an inner surface with at least two sets of backup counter module engagement features for securing an output end of a backup counter module in one of at least two backup counter module positions. The housing may be coupled to a first gas meter body with a backup counter module positioned within the housing in one of the at least two backup counter module positions. The housing may alternatively be coupled to a second gas meter body with the backup counter module positioned within the housing in another of the at least two backup counter module positions.