Images to the right are examples of the floats physical characteristics in a Variable Area Flowmeter.
Your Blue-White Flowmeter is clearly marked where you will need to read the float. Use this chart as a reference.
Read Float at Largest Diameter.
Please note the Floats up position when disassembling the flowmeter for cleaning.
Sharp Edge Float
Ball Float
Read Float at Top.
Please note the Floats up position when disassembling the flowmeter for
cleaning.
Hat Float
Slug Float
Tapered Tube.
The meter comprises a vertically tapered tube through which
the fluid to be measured is passed, from the smaller end up to the larger. As the fluid flows through the tube, it forces an
indicator (float) upward. The clearance space (area) between the float and tube increases as the float approaches the top of the
meter. This increasing area requires a larger amount of fluid to force the float higher. By varying the taper of the tube, the
mass of the float, and the length of the tube, different flow ranges can be calibrated.
The variable area flowmeter must
obviously be plumbed into a piping system the right way: that is, with the narrow part of the taper at the bottom. Usually printed on,
or next to, the tube are the flow increments (scale). The flow rate can be read by matching the increments on the tube with the
edge of the float.
