uipment per UL
Standard 508 Industrial

UL Guide (MFHX) for heating/cooling appliance switch per UL
Standard 353 Limit Controls

CSA Class (321106) for industrial control equipment per CSA
Standard C22.2 No. 14-M Industrial Control Equipment
Maximum Service Pressure: 250 PSI
Enclosure:
NEMA Type 1 (For indoor use only)

Formed sheet metal with powdercoat nish.

(Not for use in hazardous locations.)
IFS Contacts:

IFS-1 / IFSS-1: One SPDT (Form C) switch

IFS-2 / IFSS-2: Two sets of SPDT (Form C) switches to provide
versatility in wiring two separate circuits.

15 Amps at 125/250VAC

.5 Amps at 125VDC

.25 Amps at 250VDC
Motor Ratings : 120VAC 240VAC
Horsepower
:
1/8
1/4

AC F.L.A. : 3.8
2.9

AC L.R.A. : 22.8
17.4

Pilot Duty Rating : 125 VA 120/240 VAC
IFS-HC Contacts:

IFS-HC-1 / IFSS-HC-1: One SPDT (Form C) switch

IFS-HC-2 / IFSS-HC-2: Two sets of SPDT (Form C) switches to
provide versatility in wiring two separate circuits.

22 Amps at 125/250VAC
Motor Ratings : 120VAC
240VAC
Horsepower
:
1/2
1

AC F.L.A. : 9.8
8.0

AC L.R.A. : 58.8
48.0

Pilot Duty Rating : 125 VA 120/240 VAC
Ambient Temperature Range:
32°F/176°F
(0°C/80°C)
Media Temperature Range:
32°F/250°F
(0°C/121°C)
IFS / IFS-HC Pipe Connection:

1 in. NPT Brass
IFSS / IFSS-HC Pipe Connection:

1 in. NPT 316 Stainless Steel
Conduit Entrance: Two openings for 1/2" conduit
Usage: For pipe sizes 1" - 8"
Note:
Model IFS-WP available with NEMA 4 enclosure for


outdoor use. (See bulletin no. 5401041).
IFS-1 Stock No. 9000001 (CE Marked)
IFS-2 Stock No. 9000002 (CE Marked)
IFS-HC-1 Stock No. 9000003
IFS-HC-2 Stock No. 9000004
IFSS-1 Stock No. 9000310 (CE Marked)
IFSS-2 Stock No. 9000311 (CE Marked)
IFSS-HC-1 Stock No. 9000312
IFSS-HC-2 Stock No. 9000313
General
The Model IFS is a ow switch used in liquid ow lines carrying
water or any uid not harmful to brass, stainless steel, EPDM or
uorosilicone, and not classi ed as a hazardous uid.
This switch can serve as a way to start and stop electrically operated equipment
when a ow or no ow condition occurs in a variety of applications.
This device is designed for use only as an operating control. Where an
operating control failure would result in personal injury and/or loss of
property, it is the responsibility of the installer to add devices (safety,
limit controls) that protect against, or systems (alarm, supervisory
systems) that warn of control failure.
Potter Electric Signal Company 2081 Craig Road, St. Louis, MO, 63146-4161 Phone: 800-325-3936/Canada 888-882-1833

www.pottersignal.com
This device is not intended for applications in explosive environments. MFG. #5401022 - REV P
3/04
PRINTED IN USA
PAGE 2 OF 3
IFS/IFSS SERIES
INDUSTRIAL FLOW SWITCH
Mounting And Installation
The Model IFS may be mounted in a horizontal pipe line or a vertical
pipe line with upward liquid ow. It is not recommended for installations
where ow is downward. When mounted in a horizontal pipe line the
switch will trip at a lower ow rate than shown in Fig. 7.
Mount the device in a section of pipe where there is a straight run of
at least 5 pipe diameters on each side of the ow switch. Do not locate
adjacent to valves, elbows or ori ces. The switch should be mounted so
the terminals or wire leads are easily accessible for wiring.
IFS models with exible paddles are furnished with 4 paddles. Rigid
paddle models are furnished with 2 paddles. For pipe sizes 1",2",3",6",or
8", use the paddles provided. Intermediate sizes may be trimmed from
the appropriate paddle using the paddle template in Fig. 5. The paddle
must not touch the inside of the pipe or bind in any way. Paddles smaller
than the actual pipe size should be used for added support and higher
sensitivity. See Fig. 3. The paddles must be properly attached and the
screw that holds the paddle must be securely tightened.
For a 1" pipe application mount in a standard 1" x 1" x 1" tee. Use a
reducing tee for larger sizes of pipe to keep ow switch close to pipe
and provide adequate paddle length in the ow stream.
Example: Use a 2" x 2" x 1" tee for 2" pipe. A weldolet may also be
used. Screw the device into the tee tting as shown in Fig. 4. The at of
the paddle must be at a right angle to the ow. The arrow on the side of
the bushing must point in the direction of ow.
Use the drawing at right as a template
and trim at the dotted arc when
trimming the appropriate paddle for
intermediate pipe sizes.
Fig. 3
Typical paddle arrangement
for 6" to 8" pipe.
Note:
Turn screw clockwise
to increase the ow
rate required to
activate the switch.

Turn screw counter-
clockwise to decrease
the ow rate required
to activate the switch.
Fig. 1
Fig. 2
Fig. 4
Screw the device into the TEE tting as shown.
Care must be taken to properly orient the device
for the direction of the ow. Do not tighten
by grasping the switch enclosure. Use the
wrenching ats on the bushing only. Turning
radius required for mounting the IFS is 3".
Fig. 5
The paddle must not touch the inside of
the pipe or bind in any way. MFG. #5401022 - REV P
3/04
PRINTED IN USA
PAGE 3 OF 3
IFS/IFSS SERIES
INDUSTRIAL FLOW SWITCH
SWITCH ACTION
ON FLOW
DECREASE
SWITCH ACTION
ON FLOW
INCREASE
SWITCH ACTION
ON FLOW
INCREASE
SWITCH ACTION
ON FLOW
DECREASE
SECOND SWITCH
PROVIDED ON
MODEL IFS02
SECOND SWITCH
PROVIDED ON
MODEL IFSH2
DWG# 1022-2
COM. N.C. N.O.
COM.
COM.
COM.
COM.
COM.
N.O.
N.O.
N.O.
N.O.
N.O.
N.C.
N.C.
N.C.
N.C.
COM. N.O. N.C.
TOP OF SWITCH(ES)
N.C.
N.C.
N.O.
COM.
TOP OF SWITCH(ES)
Wiring
Use properly rated temperature supply wire for the anticipated
service temperature.
Make all electrical connections in accordance with the National
Electrical Code and local regulations.
See Figs. 6A and 6B for diagrams illustrating switch action.
Adjustment
Remove switch cover and turn the sensitivity adjusting screw
clockwise to increase the ow rate required to actuate the switch.
Turn the sensitivity adjusting screw counter-clockwise to decrease
the ow rate required to actuate the switch. (See Fig. 1.) Be sure to
replace the cover upon completion of the installation and adjustment.
Notes:
1. Typical ow rates for 1" to 1 1/2" pipe sizes are averages which may
vary approximately ±1 GPM with the use of a bronze reducing tee.
2. Typical ow rates for 2" to 8" pipe sizes are averages which may
vary ±10% with the use of a 1" weldolet.

(*) Flow rates for these sizes are calculated.
IFS-1/IFS-2 Switch Information
IFS-HC-1/IFS-HC-2 Switch Information
Check the installation for "no- ow"
switch operation. Make appropriate
adjustments to the sensitivity
adjustment screw to be sure the switch
restores fully at the desired ow rate.
Fig.
6A
Fig.
6B
Fig. 7
Typical Flow Rates-GPM Required to Actuate Switch (For Vertical Pipe Installations)
Pipe Size (Inches)
1
1¼
1½
2
2½
3
4
*5
6
*8
Minimum
Adjustment
Flow
Increase
4.5
4.5
6
7.5
13.5
18
35
50
70
210
Flow
Decrease
3.5
3.5
5
5.5
9.5
13
25
40
60
190
Maximum
Adjustment
Flow
Increase
9.5
10
13.5
20
29
50
70
120
180
410
Flow
Decrease
7
8.5
10.5
18.5
26
45
65
105
160
380 MFG. #5401041 - REV L
3/04
PRINTED IN USA
PAGE 1 OF 4
IFS-WP 1&2/IFSS-WP 1&2
INDUSTRIAL FLOW SWITCH
Listings/Approvals:

UL Guide (NKPZ) for industrial control equipment per UL
Standard 508 Industrial Control Equipment

UL Guide (MFHX) for heating/cooling appliance switch per UL
Standard 353 Limit Controls

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

CE
Marked
Maximum Service Pressure: 250 PSI
Enclosure: Die-cast grey powdercoat nish on cover.

Plated steel base.

Not for use in hazardous locations.
Contacts:

IFS-WP1 / IFSS-WP1: One SPDT (Form C) switch

IFS-WP2 / IFSS-WP2: Two sets of SPDT (Form C) switches to
provide versatility in wiring two separate circuits.

15 Amps at 125/250VAC

.5 Amps at 125VDC

.25 Amps at 250VDC
Motor Ratings : 120VAC 240VAC
Horsepower
:
1/8
1/4

AC F.L.A. : 3.8
2.9

AC L.R.A. : 22.8
17.4
Pilot Duty Rating : 125VA 120/240VAC
Environmental Speci cations:
Suitable for indoor or outdoor use with factory installed gasket
and die-cast housing.
NEMA 4 Rated Enclosure - use with appropriate conduit tting.
Ambient Temperature Range:

32°F to 176°F (0°C to 80°C)
Media Temperature Range:

32°F to 250°F (0°C to 121°C)
IFS-WP1 / IFS-WP2 Pipe Connection:

1 in. NPT Brass
IFSS-WP1 / IFSS-WP2 Pipe Connection:

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 applications in explosive
environments.
IFS-WP1 Stock No. 9000005
IFS-WP2 Stock No. 9000006
IFSS-WP1 Stock No. 9000314
IFSS-WP2 Stock No. 9000315
General
The Model IFS-WP is a ow switch used in liquid ow lines carrying
water or any uid not harmful to brass, stainless steel, EPDM or
uorosilicone, and not classi ed as a hazardous uid.
This switch can serve as a way to start and stop electrically operated
equipment when a ow or no ow condition occurs in a variety of
applications.
This device is designed for use only as an operating control. Where an
operating control failure would result in personal injury and/or loss of
property, it is the responsibility of the installer to add devices (safety,
limit controls) that protect against, or systems (alarm, supervisory