BM Series Meter
internal view of rotor
Avery-Hardoll flowmeters are precision made, positive displacement, liquid measuring instruments that maintain accurate metering over long periods of operation. Simplicity of design and construction together with sustained accuracy has led to the widespread use of BM Series meters on aviation refuelling vehicles as well as master meters for use in calibration throughout the world.
The BM Series flowmeter directly converts volume to rotational output with minimum scope for error and with minimal disturbance from surrounding conditions, such as turbulence from nearby valves, bends, and other system conditions.
The positive displacement principle is the ONLY accurate method of measuring fluid flow. No other technology can achieve such accuracy because measurement becomes inferred, which 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.
Manifold: Fabricated steel or ductile iron (ductile iron not available on triple capsule meters)
Body: Ni-Resist cast iron
Rotor: Aluminum or Ni-Resist cast iron
Outer Covers: Aluminum or Ni-Resist cast iron
Inner Covers: Ni-Resist cast iron
A full range of meter accessories are available for use with all Avery-Hardoll bulk meters listed below:
Avery-Hardoll bulkmeters can be used on all petroleum products of all viscosities. However there is obviously an increase in pressure drop with more viscous fuels which, under normal circumstances, will limit the maximum flow rate obtainable.
It is recommended that the pressure drop through a bulkmeter should not exceed 15 psi (one bar), above which the load on the bearings will start to cause wear. Consequently when using products with viscosities (at operating conditions) above 100 centistokes, it is necessary to reduce the maximum permitted flowrate. As a guide it is suggested that the pressure drop through the meter should not exceed 10 psi (0.7 bar) for continuous running at maximum speed or 15 psi (one bar) for continuous running at half speed.
The low pressure drop for the BM series of Avery-Hardoll bulkmeters is displayed below:
Maximum working pressure: 10.5 bar (150 psi)
Test pressure: 21 bar (300 psi)
Temperature range: -28ºC to 100ºC
Volume per revolution:
Repeatability (typically): .02%
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