Dwyer FS - Manual

Specifications - Installation and Operating Instructions
DESCRIPTION
Industrial
Direct-Reading Series FS Flowmeters are
rugged, low cost, and simple to install. The Series FS
offers visual flow rate indication and an adjustable flow
alarm to open or close AC electrical circuits, trigger
warning lights, or activate other process control
equipment. Operating within ±5% of full scale accuracy,
the Series FS can be installed vertically or horizontally
without installing any special plumbing. The Series FS is
constructed of high impact resistant polysulfone. This
series offers excellent structural integrity against operating
pressures up to 325 psi (22.4 bar) for liquids and 125 psi
(8.6 bar) for gases. The Series FS can withstand fluid
temperatures up to 250°F (121°C) and is compatible with a
wide range of chemicals.
Bulletin # F-41-FS
Series FS Flowmeter with Limit Switch
PHYSICAL DATA
Accuracy: ±5% Full Scale.
Repeatability: 1.0%.
Set Point: Adjustable 0 to
100% FS.
Pressure Limits: 325 psi (22.4
bar)
Temperature Limits: 250°F
(121°C).
Supply Voltage: 115 VAC, 140
VAC max.
On-State Current: 0.02 to 1.0
A AC.
Connections: 1˝ male NPT
Polysulfone or 3 /
4
˝ male NPT
Brass.
Flow Scale: Calibrated at 1.0
specific gravity @ 70°F (21°C).
Wetted Materials: Polysulfone
body, Barium Ferrite, Stainless
Steel spring and retaining
rings.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
TO OPEN FLAMES OR EXCESSIVE HEAT. The meter may
melt, crack, or distort. Some pipe dope formulas will react
adversely with polysulfone. Use Teflon
® tape as if sealing
material is necessary.
The Series FS can be mounted in any plane of orientation.
Horizontal or vertical mounting does not effect flowmeter
accuracy. The inlet and outlet of the flowmeter should be
aligned, particularly when high temperature, high
pressure, or a combination of both may be encountered.
Install the flowmeter in the direction of the indicating
arrow on the scale. The Series FS Flowmeter does not
require lengths of straight pipe at the inlet, or outlet, to
stabilize flow through the meter. These meters can
tolerate particles that normally will jam other flow controls.
If large amounts of particulates are encountered, a 200
mesh or 74 million micron filter is recommended.
A separate four conductor female connector is supplied
with the limit switch assembly. The connector must be
disassembled to solder wired onto it. See Figure 1. the
Connector has four solder lugs labeled 1, 2, 3, and 4.
Terminals 3 and 4 are not used. It should be noted before
reassembly, which wire is connected to which solder plug.
Color coding or labeling the wires is advised. Secure
OPERATING PRINCIPLE
The Series FS is a piston-type variable area flow meter
that uses a sharp-edged annular orifice formed between
an open-centered piston and tapered metering cone. the
piston is held in a “no flow” position at the base of the
cone by a precision retention spring. Flow through the
meter creates a pressure differential across the piston
orifice, moving the piston against the spring. Piston
movement and orifice area are proportional to the rate of
flow. Therefore, the greater the rate of flow, the further the
piston moves along the tapered metering cone. The flow
rate is measured by the viewing the red indicator ring
mounted on the piston relative to a graduated flow scale
affixed to the outer surface of the flow meter body.
MECHANICAL INSTALLATION
CAUTION: DO NOT OVER TIGHTEN THE THREADS ON
THE PLASTIC BODY. Overtightening the NPT threads may
cause fracturing of the plastic flowmeter body. The
flowmeter is constructed of polysulfone and remains
stable to 210°F (99°C). DO NOT EXPOSE FLOWMETER
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