Watts FS20 User Manual download pdf

Series FS20

Nema 4X Flow Switch

Sizes: For pipes 1"- 6" (25 – 150mm)

Series FS20 provides accurate monitoring of liquid flow in

pipelines servicing water systems, heating systems, air condi-

tioning, and processing installations for industrial and commer-

cial applications. The FS20 series is recommended for use in

areas of high humidity for indoor or outdoor installations requir-

ing Nema 4X watertight, dust-tight, and corrosion-resistant

enclosures. The switch is epoxy coated and corrosion resist-

ant. The Nema 4X Flow Switch is designed to act as an auto-

matic control or safety device for liquid flow. The single-pole,

double-throw switch can be wired to start or stop a motor

when a flow or no flow condition exists or activate an alarm

when flow is inadequate. The switch then turns off the alarm

when adequate flow is restored. Series FS20 flow switches

can be installed in a tee for horizontal or vertical piping.

Features

• Beryllium copper paddle

• Brass alloy bellows seals switch assembly from the line

• Two adjusting screws, fine and coarse, to adjust sensitivity

•

⁄2" (15mm) threaded conduit hub accepts standard

vapor-proof connectors

• Removable cover for easy access to switch terminals

• Corrosion-resistant

• Zinc die-cast enclosure

• Epoxy-coated finish

• 1" (25mm) NPT connection

• Switch assembly independent and removable from

mounting adapter

Standards

Underwriter’s Laboratories Listed U.S.A. No. 11S1

Pressure -Temperature

Maximum Working Pressure: 150psi (10.3 bar) at 300ºF (148.9ºC)

For Commercial and Industrial Applications

ES-FS20

Job Name

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Contractor

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Job Location

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Approval

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Engineer

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Contractor’s P.O. No.

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Approval

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Representative

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Nema 4X Flow Switch

Paddles

3 in 1 Paddle – A segmented beryllium copper paddle is quick-

ly adaptable for 1" through 3" pipe (25 through 80mm). The

extended beryllium copper paddle, also included, is for larger

pipe sizes up to 6" (150mm). Paddle length conforms to ASTM

tee standards.

Materials

Body: Cast brass ASTM

Bellows: Brass ASTM B-36

Cover: Epoxy coated die cast zinc

Enclosure: Epoxy coated die cast zinc

Paddle: Beryllium Copper ASTM B-194

Coupling: Brass ASTM B-36

O-rings: Buna N

GENERAL

SIGNALING

EQUIPMENT

11S1

Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,

please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with-

out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

ES-FS20.qxd 6/9/09 10:00 AM Page 1

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Summary of Contents

Page 1 - Series FS20

Series FS20Nema 4X Flow SwitchSizes: For pipes 1"- 6" (25 – 150mm)Series FS20 provides accurate monitoring of liquid flow inpipelines servic

Page 2 - Flow Rates

Dimensions31⁄4"(82mm)31⁄4"(82mm)25⁄16" (59mm)113⁄16" (284mm)31⁄4" (82mm)7⁄8" (22mm)17⁄8" (48mm)HEX1⁄2" (15mm)T

Watts FS20 User Manual

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Watts FS20 User Manual

Browse online or download User Manual for Water equipment Watts FS20. Watts FS20 User Manual

Summary of Contents

More documents for Water equipment Watts FS20

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