Measuring and testing – Volume or rate of flow – Thermal type
Patent
1978-11-07
1980-04-01
Watkins, Donald
Measuring and testing
Volume or rate of flow
Thermal type
73DIG5, 73432A, 116204, G01F 124
Patent
active
041955188
ABSTRACT:
An armored rotameter capable of accurately measuring low flow rates, the meter including a metal body provided with a bore defining a vertical flow tube having a lower inlet into which a fluid to be metered is admitted and an upper outlet from which the fluid is discharged. Disposed in the flow tube is a float having a guided stem which includes a lateral pin projecting through a slot in the front wall of the meter body, the pin riding up and down the slot as the float moves up and down the tube as a function of flow rate. The pin is coupled to one end of a bar magnet link that is external to the meter body and is swingable about a center pivot, the link being caused to swing to an extent and direction in accordance with float movement. The slot and link are sealed by a pressure plate secured to the front face of the meter body. External to the pressure plate and parallel to the link is a bar magnet pointer swingable about a center pivot in axial alignment with the link pivot, the link and pointer being in magnetically attractive relation whereby as the link swings, its movement is followed by the pointer to provide a flow rate indication on a scale associated therewith.
REFERENCES:
patent: 2425691 (1947-08-01), Brewer
patent: 3164989 (1965-01-01), Busillo et al.
patent: 3315523 (1967-04-01), Conkling
patent: 3977248 (1976-08-01), Metzger
patent: 4016827 (1977-04-01), Lawrence
Ebert Michael
Fisher & Porter Company
Watkins Donald
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