Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1979-11-13
1981-12-29
Gill, James J.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73234, 73861, G01F 302, G01F 2500
Patent
active
043076017
ABSTRACT:
Measuring apparatus for calibrating flow meters and the like comprising a piston slidably mounted within piston cylinder means which receives gas passing through the flow meter being calibrated to cause the piston to be lifted. A precision encoder is rotated responsive to the movement of tape means aligned with the central axis of the piston and entrained about a pulley driving said encoder means. The tape is also connected to counterbalancing weight means for enhancing the sensitivity and accuracy of the measuring apparatus. The system electronics initiate operation of timer means upon the first pulse generated by the encoder means after operation of a start button and terminates the operation of the timer means upon the first encoder pulse generated after operation of stop button.
Temperature and pressure in the piston cylinder are constantly monitored. These readings are employed at the time flow rate calculations are performed to correct the flow rate calculated to standard temperature and pressure.
A release valve and/or limit switch means is provided to protect both the equipment and operators from damage or injury due to malfunctions, the release valve being adapted to open when the pressure within the container builds to a predetermined level and the limit switch being adapted to shut down the apparatus when the piston moves beyond a predetermined limit position.
An arrangement for collecting the mercury employed in the sliding liquid seal is designed to prevent intermixing of the gas and the mercury.
REFERENCES:
patent: 3125879 (1964-03-01), Porter
patent: 3457768 (1969-07-01), Jasek
patent: 3933027 (1976-01-01), Mehall
patent: 3937048 (1976-02-01), St. Clair et al.
patent: 4253156 (1981-02-01), Lisle et al.
Arcstart, Inc.
Gill James J.
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