www.AutomationDirect.com
16
12
8
4
80
60
40
20
GPM
LPM
Flow Rate
Indicator
Figure 2: Flow rate indicator
INSTALLATION
THIS UNIT SHOULD BE INSTALLED AND SERVICED BY TECHNICALLY
QUALIFIED PERSONNEL TRAINED IN MAINTAINING INDUSTRIAL
CLASS FLOW INSTRUMENTATION AND PROCESSING EQUIPMENT.
READ INSTRUCTIONS THOROUGHLY BEFORE INSTALLING THE UNIT.
IF YOU HAVE ANY QUESTIONS REGARDING PRODUCT INSTALLATION
OR MAINTENANCE, VISIT WWW.AUTOMATIONDIRECT.COM OR CALL
TECHNICAL SUPPORT FOR MORE INFORMATION (1-800-633-0405).
LIQUID PIPE SEALANTS, PVC/CPVC PRIMERS AND PVC/CPVC
CEMENTS CONTAIN SOLVENTS THAT ARE NOT COMPATIBLE WITH
POLYSULFONE PLASTIC. ALLOWING LIQUID PIPE SEALANTS TO
CONTACT THE PLASTIC FLOW METER WILL RESULT IN WEAKENING
OF THE FLOW METER BODY AND POTENTIALLY CAUSE FRACTURING
UNDER PRESSURE.
Precautions
•
Do not allow liquid pipe sealant, PVC/CPVC primer or PVC/CPVC
cements to come into contact with the plastic flow meter. These
contain solvents that are not compatible with polysulfone plastic
and result in the flow meter body weakening and potentially
fracturing under pressure. If a pipe sealant is required, use Teflon®
tape.
•
Do not install the flow meter in piping systems that are not aligned
or properly supported.
•
Do not connect the flow meter male plastic NPT fittings to female
metal NPT couplings. Differences in coefficients of expansion
between metals and plastics can cause the plastic flow meter body
to crack. Use a female-to-female plastic pipe coupling to connect
metal pipe to the plastic flow meter.
•
Do not use pipe wrenches on the flow meter body. Use an open-
end wrench on the integral hex flats during installation to avoid
scarring or otherwise damaging the external surface.
•
Do not subject the flow meter to back pressure or back flow. The
flow meter can be damaged if subjected to either condition.
•
Do not install the flow meter on systems with large degrees of
particulate contamination. Install a minimum filtration of 200 mesh
(74 micron) for trouble-free operation.
•
Do not install O-ring seals that have not been lubricated.
TO AVOID UNNECESSARY PIPE FLEXING THAT COULD CAUSE
STRUCTURAL STRESS ON THE FLOW METER BODY, INDEPENDENT
SUPPORT LOCATED AS NEAR AS POSSIBLE TO THE INLET AND
OUTLET OF THE METER SHOULD BE USED TO ISOLATE THE METER
FROM THE PIPING SYSTEM. FAILURE TO PROVIDE THIS SUPPORT
COULD REDUCE THE LIFE OF THE METER.
Properly align the piping with the meter inlet and outlet to minimize
structural stress on the plastic meter body. Special attention should be
given to this effort if higher operational pressures and/or temperatures
are anticipated. Firmly support the piping by using external mounting
brackets, both upstream and downstream from the meter to avoid any
pipe flexing that could reduce the life of the meter.
•
If the flow meter inlet or outlet is being rigidly mounted, and the
opposing port must be connected to a flexible hose, then the end
connected to the flexible hose must be rigidly mounted.
•
Flow meters can be installed immediately adjacent to 90° elbows or
other components, providing system design flexibility.
Flow Direction
These meters accept flow in one direction. Align the Flow Arrow, located
on the bottom of the meter’s flow scale, in the same direction as the
anticipated line flow. See
Figure 3
.
Flow Direction
Indicator
Figure 3: Flow direction indicator
Variable Area Flow Meter
FG1 Series User Guide
INTRODUCTION
The ProSense FG1 series flow meter is a rugged, low-cost direct reading
industrial class flow meter that is simple to install. It can be mounted in
any position without costly flow straighteners or other special plumbing.
Constructed of high impact polysulfone plastic, the ProSense FG1 series
offers excellent structural integrity and chemical compatibility with a
wide range of industrial chemicals.
ProSense FG1 flow meters provide instantaneous, direct-reading flow
rate measurement of liquids in closed piping systems. The transparent
polysulfone plastic body allows visual inspection of the fluid condition as
well as viewing of the internal flow indicator relative to a calibrated flow
scale. See
Figure 1
.
ProSense FG1 meters do not require electrical connections for operation,
and provide measurement by creating a predictable differential pressure
across a sharp-edged orifice that is located in the piston assembly.
Spring
Metering Cone
Limit Indicator
Flow Scale
End Fitting
Body
Serrated Rail
Piston Assembly
Flow Indicator
Retaining Ring
Figure 1: Parts location
OPERATING PRINCIPLE
The ProSense FG1 series flow meter is a piston-type variable area flow
meter that uses a sharp-edged annular orifice, formed between an open-
centered piston and a tapered metering cone. The piston is held in the
no-flow position at the base of the cone by a precision retention spring.
As flow in the pipe increases, the differential pressure correspondingly
increases across the piston orifice, and moves the piston/flow indicator
against the spring. The greater the flow rate, the further the piston moves
along the tapered metering cone.
The flow rate is measured by viewing the red indicator ring, mounted on
the piston, relative to a graduated flow scale located on the transparent
flow meter body. See
Figure 2
.
The unique design allows the meter to be mounted in any orientation,
horizontal, vertical or upside down, without sacrificing measurement
performance. Flow straighteners, located in the inlet and outlet, allow
the flow meter to be less sensitive to turbulent flow conditions. Liquid
measurements are provided in gpm and lpm.
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