Flow Switch

Paddle Type Flow Switch

IF3 Series [Option]

How to Order
Flow switches, IF3 series detect
and confirm liquid flow, generally
used in fields such as air condi- IF3 1 1 N 10 1 1
tioning, water supply equipment,
CE-compliant
etc. Nil None

 Piping sizes ranges from 3/4B to Paddle type Q CE-compliant

flow switch
6B. Seal material of
 Wide range of applicable fluids. wetted parts
Wetted metal part materials: Copper alloy, 0 NBR
Enclosure
Stainless steel 1 FPM
0 Open type
 Various enclosures (No water Dripproof/Rainproof type Metal material
1
protected). (Equivalent to IP42) for wetted parts
Open type, Dripproof/Rainproof, Splashproof 0 Brass, Phosphor bronze
Splashproof/Low jetproof type
/Low jetproof type 2
(Equivalent to IP44) 1 Stainless steel 304

Port size
06 3/4
ON-flow range Thread type
10 1
0 14 to 60 L/min Nil R
Note 1) IF30 is available for
1 20 to 1500 L/min N NPT “06”.
3 36 to 2600 L/min Note 2) IF31 and IF33 are
available for “10”.

Specifications

Copper alloy Water/Non corrosive liquid

Fluid
Stainless Liquid, which does not corrode stainless steel 304.
steel 304
Max. pressure 1 MPa
Water resistance 1.75 MPa
Insulation resistance 100 MΩ (500 DC by megameter)
Withstand voltage 1500 VAC for one min.
Contact 1ab
Port size 3/4, 1

Micro Switch Ratings

Non inductive load (A) Inductive load (A)

Voltage Load resistance Light load Inductive load Motor load
N.C. N.O. N.C. N.O. N.C. N.O. N.C. N.O.
125 VAC 15 15 3 1.5 15 15 5 2.5
250 VAC 15 15 2.5 1.25 15 15 3 1.5
8 VDC 15 15 3 1.5 15 15 5 2.5

14 VDC 15 15 3 1.5 10 10 5 2.5

30 VDC 6 6 3 1.5 5 5 5 2.5

125 VDC 0.5 0.5 0.5 0.5 0.05 0.05 0.05 0.05
250 VDC 0.25 0.25 0.25 0.25 0.03 0.03 0.03 0.03

402
 Flow Switch
Paddle Type Flow Switch IF3 Series
Fluid and Ambient Temperature Range Enclosure

Fluid temperature Applicable ambient temperature Note) Open type Using indoors away from water drop
70°C or less 70°C (70°C) or less Dripproof/Rainproof type When using indoors or outdoors, where it is
80°C 58°C (60°C) or less (JIS C 0920) exposed to water drop. (Equivalent to IP42)

90°C 47°C (50°C) or less Splashproof/ Sealed construction. When using in a bad
environment, such as outdoors, or areas
100°C 35°C (40°C) or less Low jetproof type
exposed to water stream temporarily, or near
(JIS C 0920) the coast. (Equivalent to IP44)
Note) ( ) For IF32
∗ To protect the microswitch, ambient temperature must be lowered when
the fluid temperature exceeds 70°C.

Construction Flow Rate Characteristics

Fluid: Water, Outlet pressure: 0 MPa

Upper insulator Sealing thread depth: 9 mm (3/4), 11 mm (1)
Micro switch Flow range (L/min)
Mounting
Minimum Maximum ON-flow
Retaining screw Flow rate/setting
switch Port Paddle ON OFF ON OFF
Flow adjusting (m/s)
screw size size flow flow flow flow
(min) (min)
Retaining screw 3/
4 Long 14 7 38 33 0.66 to 1.79
IF30-06 3/
4 Middle 18 9 50 44 0.85 to 2.36
3/ Short 22 11 60 53 1.04 to 2.83
4

1 Short 20 10 60 55 0.56 to 1.67

11/4 Short 34 17 100 90 0.57 to 1.67
11/2 Short 52 26 160 140 0.63 to 1.95
2 Middle 45 23 140 125 0.34 to 1.06
IF31-10 21/2 Middle 90 45 280 250 0.41 to 1.29
3 Long 80 40 250 220 0.26 to 0.81
4 Long 170 85 550 480 0.33 to 1.05
5 Long 300 150 1,000 870 0.37 to 1.24
6 Long 460 230 1,500 1,300 0.40 to 1.32
PFM
1 Short 36 18 110 100 1.00 to 3.05
PFMB
11/4 Short 54 27 160 140 0.90 to 2.67
11/2 Short 90 45 270 230 1.10 to 3.29 PFMC
Component Parts 2 Middle 90 45 270 230 0.68 to 2.05
Material
PFMV
No. Description IF33-10 21/2 Middle 160 80 500 420 0.74 to 2.30
IF30 IF31 IF32
1 Cover SPCD SPCD ADC 12
3 Long 160 80 500 420 0.52 to 1.63 PF2A
Mounting plate 4 Long 320 160 1,000 800 0.61 to 1.91
2 SPCC Stainless steel 304 Stainless steel 304
3 Bellows PBP or Stainless steel 304 5 Long 560 280 1,800 1,450 0.69 to 2.23
PF3W
4 Body C3604B or Stainless steel 304
5 Mobile bar C2700W or Stainless steel XM7
6 Long 800 400 2,600 2,000 0.70 to 2.28
LFE
ON-flow: Flow volume under which a microswitch starts activation while
6 Paddle Stainless steel 304
7 O-ring NBR or FPM
flow is increasing.
OFF-flow: Flow volume under which a microswitch starts activation while
PF2D
flow is decreasing.
• The maximum flow is twice the maximum ON-flow. IF
• Data shows the reference value. Operating flow values may differ from
those shown above as a result of sealing depth and direction of mount-
ing, piping conditions or variations among individual items, so take pre-
cautions when using at levels near the minimum and maximum values of
the set flow rate.

403
IF3 Series
ON-flow Change due to Pressure Pressure Drop Curve

60

50 0.05

Pressure drop (MPa)

pe
ON-flow change (%)

40 w 0.04
-flo

pi
ON e

pe
4B
n. 3/ p
Mi pi

pi
30 0.03 1B , 3B
2B
20 ipe
0.02 Bp
,5
, 4B
10
Max. ON-flow 0.01 11 /4 pipe
, 6B
21 /2B
11 /2B,
0 0
0.2 0.4 0.6 0.8 1.0 1 2 3 4 5
Pressure (MPa) Flow speed (m/s)

Precautions
Be sure to read this before handling the products.
Refer to back page 50 for Safety Instructions and pages 202 and 203 for Flow Switch Precautions.

Mounting & Wiring 9. Wire the microswitch according to the symbols on the upper
insulators. (They will be opposite the terminal symbols on the
Caution microswitch. The terminals are screw terminals.)
10. Threads used for the terminals are M4 type.
1. Mount the switch on top of horizontal pipe so that fluid flow is in
the direction of the arrow. Internal wiring diagram
Sealing depth should be 9 mm ± 1 mm for 3/4B and 11 mm ± 1.2 Symbol Contact
C (COM)
mm for 1B. A (NO)
C Common
2. Mounting orientation is only allowed to install it perpendicularly
to the horizontal pipe. A Normally Open
3. Provide a straight pipe portion that corresponds to approximately B (NC) B Normally Closed
5 times the bore of the pipe before and after the area of the pipe
on which the product is installed, thus keeping the product as far
away as possible from the elements that disturb the flow, such Adjusting
as elbows or valves.
4. Three types of paddles, short, medium, and long, are provided Caution
with each model. Use one of them according to the pipe size 1. Flow adjustment is done by turning the flow adjusting screw with
and the set flow rate. Phillips screwdriver. Turning clockwise can increase the set
5. When installing a paddle on IF3∗0 type, piping may be interfered flow and turning counterclock can decrease the set flow.
with by the tip of a paddle. 2. Flow rate % relation to the number of turns is shown in the table
Because this is used to detect a small flow rate, and to narrow below. However, this is just a guide. For precise setting use a
the distance between a paddle and piping, additional machining flow meter.
of the paddle tip may be necessary to eliminate interference Flow adjusting screw (Rotations) 0 1 2 3 4 5 6 7 8 9 10 11 12
between the two.
Contact ON-flow (%) 30 40 50 59 68 74 80 85 89 93 96 98 100
6. Use pipe fittings that comply with JIS specifications.
For 11/4B to 3B, use commercially available union tees of 3. The flow rate setting point is set at the ON-flow rate. Therefore,
different diameters. in case of 1a contact, ON signal is output when the fluid with
For 4B to 6B, use a 1B socket that has been cut in half and higher flow than the setting flow rate is flown.
welded. In the case of the 1b contact, the ON signal is output when the
7. When using piping which is non-standard, piping may interfere flow rate has decreased.
with the paddle. When this happens, please machine the paddle Refer to the flow rate characteristics table for details on the
accordingly. operation flow rate.
8. It cannot be used when a water hammer or pulsation pressure 4. Do not touch the two types of stop screws that are indicated in
is applied to the fluid. the construction diagram.
5. To prevent the chattering that is associated with the fluctuation
of the operating flow rate, set the difference between the set
Applicable fittings flow rate and the operating flow rate so that it is as large as
For pipe fitting 11/4B through 3B For pipe fitting 4B through 6B possible.
6. Use at or below the maximum operating pressure and maximum
Piping B Reducing tees B flow rate.
11/4 11/4 x 11/4 x 1 Welding Welding 7. Spare parts
11/2 11/2 x 11/2 x 1 Short, medium, and long paddles are provided as a 3 piece set
24 or less

2 2x2x1 with each model, so order with the part numbers listed below.
1B socket There is no compatibility between the paddle for a 3/4"
21/2 21/2 x 21/2 x 1
cut in half connecting bore and for a 1" because their installation pitches
3 3x3x1 differ.
Reducing tees : JIS B 2301 Applicable model no. Paddle set no.
Socket : JIS B 2302 IF30-06- 3102-13-22A
Pipe : JIS B 3452 Pipe 4B
through 6B Without flash
IF31-10- 3102-13-2A
IF33-10- 3102-13-12A
404
 Flow Switch
Paddle Type Flow Switch IF3 Series
Dimensions

Standard type: 300/301/303 Dripproof/Rainproof type: 310/311/313

2 x ø10 holes
ø10 holes
Regular hexagon For wiring Regular hexagon For wiring
width across flats 36 width across flats 36

A: Paddle short
A: Paddle short

B: Paddle middle
B: Paddle middle

Port size
C: Paddle long

C: Paddle long
Port size

Dimensions Dimensions
Part no. Port size A B C D E F Part no. Port size A B C D E F
IF300 3/
4 28 31 34 22 137 101 IF310 3/
4 28 31 34 22 137 101
IF301 1 37 62 89 28 188 98 IF311 1 37 62 89 28 188 98
IF303 1 29 39 56 28 155 98 IF313 1 29 39 56 28 155 98

Splashproof/Low jetproof type: 320/321/323

PFM
PFMB
PFMC
PFMV
PF2A
PF3W
LFE

G1/2 depth 17
PF2D
Regular hexagon
For wiring
width across flats 36
IF
A: Paddle short
B: Paddle middle

Port size
C: Paddle long

Dimensions
Part no. Port size A B C D E F
IF320 3/
4 28 31 34 22 141.3 105.4
IF321 1 37 62 89 28 194 104
IF323 1 29 39 56 28 161 104
405
IF3 Series
Flow Rate vs. Flow Speed ∗ Representing value

3/4B (ø21.6) 1B (ø27.6) 11/4B (ø35.7) 11/2B (ø41.6) 2B (ø52.9) 21/2B (ø67.9)
2

1.8

1.6
.7)
(ø80
3B
1.4
Flow speed (m/s)

1.2

1
5.3)
4B (ø10
0.8

0.6 )
5B (ø130.8
6B (ø155.2)
0.4

0.2

0
50 100 150 200 250 300 350 400

Flow rate (L/min)

( ): Gas pipe bore sizes

406