The positive displacement principle is the only accurate method of measuring liquid flow. No other technology e.g. turbine meters can achieve the same level of accuracy. This is particularly true in depot applications where flow rates, pressure and temperature can vary during a delivery. The Avery Hardoll Bulkmeter positively measures fluid volume with minimum scope for error and with minimal effect from pressure variations, temperature change or turbulence from near by valves or bends etc.
The product enters the meter and causes the rotor to revolve by pressure on the vanes.The proximity of
the rotor to the body forms an efficient seal, whilst the profile of the body ensures that the vanes are
guided through the measuring crescent , where the volume of product is accurately measured.
An extension shaft driving through a pressure tight gland in the meter front cover, transmits the rotor
revolutions either directly to a pulse transmitter or through gearing to a stepless mechanical calibrator
driving the counter.
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