Description:

The Type JHFR variable area flow meter is designed for measurement of high flow liquids & gases. The conical glass metering tube has a free rotating float. The flow is indicated by the top of the float and can be read from standard scale on metering tube or from a connected scale.

Features:

- Wide selection of measuring ranges.

- High accuracy of the rotating float even at low flow rates.

- Low pressure loss.

- Non-powered local indication.

-Optional Built-in needle valve.

- Light weight and rugged.

-Excellent long – term stability.

Applications:

The type JHFR is an ideal for any application that requires high flow measuring of either gas or liquid.

-Fine metering and gas chromatography

-On-line flow monitoring

Operations:

PRINCIPLE OF OPERATION:

The type JHFR is made of annealed Borosilicate glass / salfone, transparent, continuously tapered tube. The outlet will be of larger diameter through inlet and the plummet / float is designed so that it occupies almost all the total tube area when it as at the small end of the tube. As the fluid is allowed into the tube, the float will be pushed up until the differential pressure across the float results in a force under it that is just equal to the effective weight of the float.

The effective weight is equal to the weight of the float minus the buoyant force of the fluid being measured. For a given fluid and a particular plummet, the effective weight is constant. Since the effective weight is constant, the differential pressure across the plummet is constant. As the flow rate changes, the annular area must change to accommodate the various flow rates. Since the variable is area, the position of the float within the length of the tube can be used as a measure of the area for a given tube. Hence the float position can be used to determine flow.