Omega FPD-4000 Series, Руководство пользователя

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7
Installation
Preferred Flow Direction
The preferred flow direction is marked with an arrow on the meter showing the flow
direction in which the flow meter was calibrated (see figure 2). However, the flow
meters have bi-directional flow capabilities and are often used for bi-directional
flow applications. Since the meters indicate flow in both directions, if reverse flow
detection is not desired, install a check valve up-stream of the flow meter.
Preferred Orientation
The preferred orientation for mounting gear meters, especially in low flow and
or low viscosity applications, is so that the internal shaft/gear assembly is in a
horizontal orientation (housing bolts facing sideways, not up/down). This allows
for the least amount of internal drag due to mass of gears.
Location
It is important to make sure that the flowmeter is always full of fluid and never
partially filled. Do this by making sure there is always a small amount of
backpressure on the meter, usually 2 to 5 psi minimum.
Create backpressure by making sure there is some flow restriction downstream
from the flowmeter such as a check valve, regulator, or piping rising above
location of flowmeter. See Figure 1.
Backpressure from control valving is beneficial for stable running. In similar
fashion, if a flowmeter is installed with fluid flow in a downward direction, the fluid
cannot exit the flowmeter directly into a container with no restriction due to the
fact the meter will not be full of fluid, causing inaccurate measurement.
CAUTION: Eliminate all dirt, debris and metal shavings from the piping, as
the liquid must be free from any particles larger than what the manufacturer’s
specifications allow. Install any recommended filtration before operation, as
potential plugging most often occurs at startup.
Filtration
Filtration depends on the model. Make sure to follow proper filtration requirements
for your specific model. Because the internal assembly has very small clearances,
small filter sizes are required, especially for ball-bearing flowmeter versions.
NOTE: Filters are meant to filter out impurities in the fluid stream. If you are measuring fluids with
fillers, even if the fillers are smaller than the maximum recommended filter size, please consult the
factory for correct meter selection.