Badger Meter Hydrometer - Manual (Page 4)

Section I
Paragraphs 1-11 to 1-13
1-11. TUBES (fig. 2). Tubes are precision molded of
borosilicate glass with four float guides and tapered flutes
integral with the tube. The inner diameter across the guides is
the same from top to bottom but the inner diameter of the
tapered flutes expands logarithmically giving an increasing
flow area past the float as it rises. The guides confine the float
to the central axis of the tube and diminish swirls of fluid
passing through the tube. Tubes have flowmeter serial
number and tube size etched near the top of the tube.
1-12. FLOATS (fig. 2). Floats are machined of a material
impervious to the fluid used and precisely fitted to the tube
making a matched assembly of float and tube. Floats are
provided with a short threaded stub extension for attachment
of a rod to facilitate removal or installation. Floats are etched
with the flowmeter serial number and tube size.
NOTE
Tubes, floats, and scales are calibrated as a unit
and are not interchangeable. If a tube is broken,
a new tube, float, and scale must be ordered. An
unserviceable float can be replaced by fitting and
recalibrating a new float to the old tube.
Damaged scales can be replaced if flowmeter
serial number, tube number, and sizes are
furnished.
1-13. SCALES (fig. 4). Each tube with its float is accurately
calibrated and its scale graduated to agree with the calibration.
The 18-inch logarithmic type scale provides the same degree
of reading accuracy throughout the flow range. Scales are
made of plastic or aluminum and engraved with contrasting
figures. Scales are attached to adjustable support posts which
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