Abstract: A flowmeter of the thermal type, having a heated flow-sensing probe and a temperature-sensing reference probe, in which the flow is passed through nozzles to form two jets and those jets are directed at the heated portion of the heated probe and the temperature-sensing portion of the reference probe, while flow around the supporting portion of the heated probe is minimized. Such a flowmeter allows low gas flows to be measured without the use of capillary elements that are subject to plugging and can create unwanted pressure drops.

Abstract: A flowmeter of the thermal type, having a heated flow-sensing element and a temperature-sensing reference element, the elements constructed and arranged to be installed in a pressurized pipe. The flowmeter has one probe with the heated element and a separate second probe with the reference element. The probes are constructed and arranged to pass through the pipe wall in separate through-holes. There is a mounting structure such as a split ring that is adapted to be mounted to the pipe. Two valves operatively coupled to separate locations of the mounting structure, where one probe passes through each valve and into the pipe.

Abstract: A flowmeter of the thermal type, having a heated flow-sensing probe and a temperature-sensing reference probe, in which the flow is passed through nozzles to form two jets and those jets are directed at the heated portion of the heated probe and the temperature-sensing portion of the reference probe, while flow around the supporting portion of the heated probe is minimized. Such a flowmeter allows low gas flows to be measured without the use of capillary elements that are subject to plugging and can create unwanted pressure drops.

Abstract: A flowmeter of the thermal type, having a heated flow-sensing element and a temperature-sensing reference element, the elements constructed and arranged to be installed in a pressurized pipe. The flowmeter has one probe with the heated element and a separate second probe with the reference element. The probes are constructed and arranged to pass through the pipe wall in separate through-holes. There is a mounting structure such as a split ring that is adapted to be mounted to the pipe. Two valves operatively coupled to separate locations of the mounting structure, where one probe passes through each valve and into the pipe.

Abstract: A flowmeter of the thermal type, having a heated flow-sensing element and a temperature-sensing reference element, the elements constructed and arranged to be installed in a pressurized pipe. The flowmeter has one probe with the heated element and a separate second probe with the reference element. The probes are constructed and arranged to pass through the pipe wall in separate through-holes. There is a mounting structure such as a split ring that is adapted to be mounted to the pipe. Two valves operatively coupled to separate locations of the mounting structure, where one probe passes through each valve and into the pipe.

Abstract: A flowmeter which clamps around and seals to a pipe with probes projecting into the pipe through holes in the pipe, the useful separation of the probes being achieved by their entering the pipe through separate holes.

Abstract: A flowmeter which clamps around and seals to a pipe with probes projecting into the pipe through holes in the pipe, the useful separation of the probes being achieved by their entering the pipe through separate holes.

Abstract: Methods of maintaining a record of a samples of a time-dependent variable in a computer memory whereby any period of time extending backward from the present, having a duration between a pre-determined minimum and a pre-determined maximum, is represented by samples whose spacing is short in relation to the duration of the time period represented.