Methods and apparatus for proving gas meters

Details Methods and apparatus for proving gas meters Methods and apparatus for proving gas meters

1974-12-05

1976-02-10

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01F 2500

Patent

active

039370488

ABSTRACT:
There is disclosed methods and apparatus for proving fluid meters, particularly gas meters of the positive displacement, diaphragm-operated type in which the number of cycles of operations of the valve mechanism of the meter is used as a factor in proving the accuracy of the meter, the number of said cycles being determined by sensing a series of pressure waveforms in the test gas entering and leaving the diaphragm chambers of the meter, which waveforms are characteristic of the particular meter being tested and occur in each cycle and reoccuring cycle of operation of the meter when operating, detecting a characteristic waveform in each series of waveforms, amplifying and shaping the characteristic waveform and counting a predetermined number of cycles of said waveforms and comparing the volume of test gas which has passed through the meter as measured by a test bell with the amount that should have passed during that predetermined number of cycles of operations of the meter. The proving of the gas meter by the bell method may be carried out with negative pressure to determine gas drawn through the meter or by positive pressure by forcing gas through the meter. To carry out the above method of proving a meter, there is provided by the present invention improved apparatus for performing the proving operations in which the various valves, provided for the purpose, are operated by solenoids controlled by electronic means including a time controlled function selector, function performing circuits, a shift register for causing the functions to be performed consecutively and a malfunction detector.

REFERENCES:
patent: 2931216 (1960-04-01), Rauth
patent: 3035434 (1962-05-01), St. Clair
patent: 3063284 (1962-11-01), Ott
patent: 3605480 (1971-09-01), St. Clair

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