Apparatus and method for proving gas meters and improved sensor

Details Apparatus and method for proving gas meters and improved sensor Apparatus and method for proving gas meters and improved sensor

1990-03-06

1991-03-05

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

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

G01F 2500

Patent

active

049968700

ABSTRACT:
Apparatus and method for proving a test meter comprising a standard for a test gas to a meter; encoder means for determining the amount of test gas supplied from said standard; valve for regulating the flow of gas from said supply means; a sensor comprising two metallic reeds encapsulated in a housing, said reeds being maintained in a non-contacting position the magnetic field of at least two magnets, said sensor being placed in proximity to the oscillating diaphragm of a gas meter whereby said oscillating diaphragm periodically interferes with said magnetic field thereby resulting in the periodic contact of said reeds and the generation of a signal at said sensor representing the passage of a predetermined quantity of test gas; and an electronic sensing device which activates upon the contact of the metallic reeds. The mechanism includes a device for adjusting the sensitivity of the reeds.

REFERENCES:
patent: 3253099 (1966-05-01), Hess
patent: 3397347 (1968-08-01), Hoeppel
patent: 3937048 (1976-02-01), St. Clair et al.
patent: 4027523 (1977-06-01), St. Clair
patent: 4286854 (1981-09-01), Seckendorf
patent: 4301440 (1981-11-01), Kubota et al.
patent: 4315523 (1982-02-01), Mahawili et al.
patent: 4820888 (1989-04-01), Shields
Selecting Magnets For Reed Switch Actuation, by Lester R. Moskowitz, Franklin Institute Research Laboratories, Phila., PA.

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