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Flow Meter Types |
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| Positive
Displacement (PD) Flowmeters |
Positive
Displacement (PD) - PD flowmeters measure
the volumetric flow rate of a liquid or gas by
separating the flow stream into known volumes
and counting them over time. Vanes, gears, pistons,
or diaphragms are used to separate the fluid.
PD flowmeters provide good to excellent accuracy
and are one of only a few technologies that can
be used to measure viscous liquids.
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| Featured Positive
Displacement (PD) Flowmeters Suppliers |
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The Brooks® portfolio of products includes additional liquid metering and controlling devices. This includes Brooks’ Oval Gear positive displacement meters, which are ideal for highly viscous liquids in applications where accuracy and repeatability are critical
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| Featured Positive
Displacement (PD) Flowmeters Products |
| Brooks® Oval Gear Positive Displacement
Meters |
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The Brooks BM01 and BM02 are low flow positive
displacement oval flowmeters designed for
applications requiring the high accuracy measurement
of clean liquids with viscosities less than 1000 Cp.
Units are available with a pulse output from a Reed
switch or solid state Hall effect switch for remote
registration and/or totalization.
- Low flow measurement, 0.53 to 132 GPH
(2 to 500 LPH)
- Very low pressure drop
- Viscosity to 1000 Cp (Centipoise)
- High Accuracy, 1% rate or better
- 0.03% repeatability
- Only two moving parts
- Reed or solid state Hall Effect Switch
- ¼ inch female NPT standard
- Available in PPS or 316 Stainless Steel
(Hastelloy® C shaft option)
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Positive Displacement (PD) Flowmeters |
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The
Sliding Vane Meter - Sliding vanes rotate
in contact with the meter casing. |
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The
Oval Gear Meter - Oval gears , intermeshed
and sliding around in close proximity to a fixed
casing. The Piston Displacement Meter - Reciprocating
Pistons interconnected with a common crankshaft
displacing fluid through a unidirectional valve
arrangement. |
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The
Rotary Piston Meter - A rotating piston displacing
fluid by moving eccentrically around the inside
of the meter casing between inlet and outlet ports,
the piston being a sliding fit around the inside
of the meter casing. |
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The
Nutating Disc Meter - A nutating disc moving
in close contact with a machined casing is caused
to displace a fixed volume per revolution by the
fluid passage. |
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The
Bi-Rotor Meter - Two Rotors geared to move
with a small clearance around the meter casing
, containing machined recesses to pass a fixed
volume of fluid per revolution. |
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The
Helix Flowmeter - Two radially -pitched helical
rotors geared to move together with a small clearance
between themselves and the casing . The two rotors
when running together thus displace fluid axially
from one end of the chamber to the other. |
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Flow Indication & Control |
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