BM SERIES METERS
Avery-Hardoll bulkmeters are precision made, positive displacement, liquid measuring instruments,which maintain accurate metering over long periods of operation. Simplicity of design and construction together w
ith sustained accuracy has led to the widespread use of these meters on aviation refuelling vehicles, in oil
terminals throughout the world and also as master meters for use in calibration.
The positive displacement principle is the ONLY accurate method of measuring fluid flow. No othert echnology can achieve such accuracy because measurement becomes inferred, that is indirect and subject to assumption.The Avery-Hardoll bulkmeter directly converts volume to rotational output with minimum scope for error and with minimal disturbance from surrounding conditions, eg. turbulence from nearby valves, bends, etc.The product enters the meter through the inlet manifold (1) and causes the rotor (4) to revolve by pressure on the vanes (3). The proximity of the rotor (4) to the body (2) forms an efficient seal, whilst the profile of the casing ensures that the vanes (3) are guided through the measuring crescent (5), where the volume of product is accurately measured. Product at line pressure fills the spaces between the inner (6) and outer (7) end covers providing `pressure balanced inner end covers' which are therefore protected from distortion due to changes in line pressure. An extension shaft driving through a pressure tight gland in the meter front cover, transmits the rotor revolutions to the calibrating gearing (8) which drives the counter (9).
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