Listings/Approvals:• UL Guide (NKPZ) for industrial control

equipment per UL Standard 508 Indus-trial Control Equipment

• UL Guide (MFHX) for heating/coolingappliance switch per UL Standard 353Limit Controls

• CSA Class (321106) for industrial con-trol equipment per CSA Standard C22.2No. 14-M Industrial Control Equipment

• CE MarkedMaximum Service Pressure: 250 PSIEnclosure: Die-cast housing and high impact

resistant polycarbonate cover.Not for use in hazardous loca-tions.

Contacts:One SPDT (Form C) switch10 Amps at 125/250VAC.5 Amps at 125VDC.25 Amps at 250VDC

Motor Ratings : 115VAC 230VACHorsepower : 1/3 1/3

AC F.L.A. : 7.2 3.6AC L.R.A. : 43.2 21.6

Pilot Duty Rating : 332VA 120/240VACEnvironmental Specifications:

• Suitable for indoor or outdoor use withfactory installed gasket and die-cast hous-ing.

• NEMA 4 Rated Enclosure - use with appro-priate conduit fitting.

Ambient Temperature Range:32°F to 151°F (0°C to 66°C)

Media Temperature Range:-20°F to 250°F (-29°C to 121°C)

Pipe Connection:IFSWSB: 1 in. NPT BrassIFSWSS: 1 in. NPT 316 Stainless Steel

Conduit Entrance: One opening for 1/2"conduit

Usage: For pipe sizes 1" - 8"Caution: This device is not intended for appli-

cations in explosive environments.

GENERALThe IFSWS Series is a low turn radius (1.88")flow switch used in liquid flow lines carryingwater or any fluid not harmful to brass, stain-less steel, EPDM or fluorosilicone, and notclassified as a hazardous fluid.

This switch can serve as a way to start andstop electrically operated equipment when aflow or no flow condition occurs in a variety ofapplications.

This device is designed for use only as anoperating control. Where an operating controlfailure would result in personal injury and/orloss of property, it is the responsibility of theinstaller to add devices (safety, limit controls)that protect against, or systems (alarm, super-visory systems) that warn of control failure.

# 5401117-REV E

EFFECTIVE: March 17, 2004

102-026

Instruction SheetIFSWS Industrial Flow Switch

SUPERCEDES: 102-026 DATED January 1, 2002

MOUNTING AND INSTALLATIONThe IFSWS Series may be mounted in a hori-zontal pipe line or a vertical pipe line withupward liquid flow. It is not recommended forinstallations where flow is downward. Whenmounted in a horizontal pipe line the switchshould be mounted on the top side of the pipewhere it will be accessible. The switch will trip ata lower flow rate than shown in Table 1.

Mount the device in a section of pipe wherethere is a straight run of at least 5 pipe diameterson each side of the flow switch. Do not locateadjacent to valves, elbows or orifices. The switchshould be mounted so the terminals or wire leadsare easily accessible for wiring.

IFS models with flexible paddles are furnishedwith 4 paddles. Rigid paddle models are fur-nished with 2 paddles. For pipe sizes 1", 2", 3",6" and 8", use the paddles provided. Intermedi-

FIG. 2FIG. 1

Sensitivity Adjustment Note:Turn sensitivity screw clockwise to increase theflow rate required to activate the switch.Turn sensitivity screw counter-clockwise to de-crease the flow rate required to activate theswitch.

Turn radius = 1.88"

ate sizes may be trimmed from the appropriatepaddle using the paddle template in Fig. 5. Thepaddle must not touch the inside of the pipe orbind in any way. Paddles smaller than the ac-tual pipe size should be used for added supportand higher sensitivity, see Fig. 3. The paddlesmust be properly attached and the screw thatholds the paddle must be securely tightened.

For a 1" pipe application mount in a standard1"x1"x1" tee. Use a reducing tee for larger sizesof pipe to keep flow switch close to pipe andprovide adequate paddle length in the flowstream.

Example: Use a 2"x2"x1" tee for 2" pipe. Aweldolet may also be used. Screw the device intothe tee fitting as shown in Fig. 4. The flat of thepaddle must be at a right angle to the flow. Thearrow on the side of the bushing must point in thedirection of flow, see Fig. 1.

FIG. 4

CAUTION:Screw the device into the TEE fitting as shown. Caremust be taken to properly orient the device for thedirection of the flow. Do not tighten by grasping theswitch enclosure. Use the wrenching flats on thebushing only. Turning radius required for mountingthe IFSWS is 1.88".

FIG. 5

Use the drawing atright as a templateand cut at the dottedarc when trimmingthe appropriatepaddle for interme-diate pipe sizes.

CAUTION:The paddle must nottouch the inside ofthe pipe or bind inany way.

FIG. 3

Typical paddle arrangementfor 6" to 8" pipe, using smallerflexible paddles for addedsupport and higher sensitiv-ity.

NOTE:When installing rigidpaddles, do notstack paddles. Onlyinstall ONE paddlethat best fits the pipe.

WIRING

Use properly rated temperature supply wire forthe anticipated service temperature.

Make all electrical connections in accordancewith the National Electrical Code and local regu-lations.

See Fig. 6 for diagram illustrating switch action.

ADJUSTMENT

Remove switch cover and turn the sensitivityadjusting screw clockwise to increase the flowrate required to actuate the switch. Turn the

sensitivity adjusting screw counter-clockwise todecrease the flow rate required to actuate theswitch. (See Fig. 6.) Be sure to replace the coverupon completion of the installation and adjust-ment.

CAUTION: Check the installation for "no-flow"switch operation. Make appropriate adjustmentsto the sensitivity adjustment screw to be sure theswitch restores fully at the desired flow rate.

FIG. 6 SWITCH INFORMATION

TABLE 1

NOTES:

1. Typical flow rates for 1" to 1 1/2" pipe sizesare averages which may vary approxi-mately ±1 GPM with the use of a bronzereducing tee.

2. Typical flow rates for 2" to 8" pipe sizes areaverages which may vary ±10% with theuse of a 1" weldolet.

(*) Flow rates for these sizes are calcu-lated.

SNOITACIFICEPS

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)sehcni(eziSepiP 1 4/11 2/11 2 2/12 3 4 5* 6 8*

muminiMtnemtsujdA

wolFesaercnI 5.4 5.4 0.6 5.7 5.31 81 53 05 07 012

wolFesaerceD 5.3 5.3 0.5 5.5 5.9 31 52 04 06 091

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wolFesaercnI 5.9 0.01 5.31 0.02 0.92 05 07 021 081 014

wolFesaerceD 0.7 5.8 5.01 5.81 0.62 54 56 501 061 083

NOTE: Turn sensitivity screw clockwise to increasethe flow rate required to activate the switch.Turn sensitivity screw counter-clockwiseto decrease the flow rate required to acti-vate the switch.