Flow sensor with extended low flow range

Details Flow sensor with extended low flow range Flow sensor with extended low flow range

1982-12-07

1984-07-17

Swisher, S. Clement

Measuring and testing

Volume or rate of flow

Using differential pressure

73197, G01F 122

Patent

active

044598602

ABSTRACT:
In a flow sensing device in which flow is measured by the linear displacement of a moveable bobbin within a throat, the bobbin contains a cylinder and piston arrangement, with the piston linked to the same linear displacement sensing device as the bobbin. Fluid pressures upstream and downstream of a calibrated orifice parallel to the throat, is applied to opposite ends of the piston. Low flow rates are measured by the displacement of the piston, with movement of the bobbin together with the piston taking over the flow sensing function at higher flow rates.

REFERENCES:
patent: 3472275 (1969-10-01), Castro et al.
patent: 3910112 (1975-10-01), Gerlach
patent: 4235105 (1980-11-01), Walters
patent: 4366718 (1983-01-01), Nelson

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