Flow Switch, Paddle Style Flow Switch, IF3 Series

A flow switch made by SMC.

[Features]
· Piping sizes range from 3/4B to 6B
· Supports equivalent to IP42, IP44

[Applications]
Used to detect and confirm liquid flow as a general-purpose water cutoff and water reduction relay in air conditioning, water supply equipment, etc.

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Product specification
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Specifications of Flow Switch Paddle Type Flow Switch IF3 Series

External appearance of IF3 Series

Fluid	Copper alloy	Water and non corrosive liquid
Fluid	SUS304	Liquid that does not corrode SUS304
Maximum operating pressure	1.0 MPa
Water resistance	1.75 MPa
Insulation Resistance	100 MΩ or more (500 DC by insulation resistance tester)
Withstand Voltage	1,500 V AC for 1 minute
Contact	1ab
Connection port size	3/4, 1

Microswitch rating

Voltage	Non-inductive load (A)				Inductive load (A)
	Load resistance		Lamp load		Inductive load		Electric motor load
	N.C.	N.O.	N.C.	N.O.	N.C.	N.O.	N.C.	N.O.
AC125V	15	15	3	1.5	15	15	5	2.5
AC250V	15	15	2.5	1.25	15	15	3	1.5
DC8V	15	15	3	1.5	15	15	5	2.5
DC14V	15	15	3	1.5	10	10	5	2.5
DC30V	6	6	3	1.5	5	5	5	2.5
DC125V	0.5	0.5	0.5	0.5	0.05	0.05	0.05	0.05
DC250V	0.25	0.25	0.25	0.25	0.03	0.03	0.03	0.03

Liquid temperature and applicable ambient temperature range

Fluid Temperature	*) Applicable ambient temperature
70°C or less	70°C (70°C) or less
80°C	58°C (60°C) or less
90°C	47°C (50°C) or less
100°C	35°C (40°C) or less

*) () is for IF32□
* To protect the micro switch, the ambient temperature should be low when the liquid temperature exceeds 70°C.

Waterproof type

Open type	When used indoors where any water droplets do not splash
Drip-proof/rain-proof type (JIS C0920)	When used indoors or outdoors where water droplets may splash (IP42 equivalent)
Splash-proof/water-jet-protection type （JIS C0920）	It has a sealed structure and when used outdoors and in locations temporarily exposed by a flow of water, or in adverse environmental conditions such as near the coast (IP44 equivalent)

Diagram

Structural drawing of IF3 Series

Number	Name	Material
Number	Name	IF30□	IF31□	IF32□
1	Cover	SPCD	SPCD	ADC12
2	Mounting plate	SPCC	SUS304	SUS304
3	Bellows	PBP or SUS304
4	Main body	C3604B or SUS304
5	Movable rod	C2700W or SUSXM7
6	Paddle	SUS304
7	O-ring	NBR or FPM

Flow Rate Characteristics Table

Fluid: Water, outlet pressure: OMPa
Threaded depth: 9 mm (3/4), 11 mm (1)

Flow Switch	Installation classification		Set flow rate adjustment range L/min				ON flow rate setting flow velocity range m/s
	Installation classification		Minimum		Max.
	Tubing outer diameter	Paddle size	ON flow rate	OFF flow rate min	ON flow rate	OFF flow rate min
IF3□0-06	3/4	Length	14	7	38	33	0.66 to 1.79
	3/4	Medium	18	9	50	44	0.85 to 2.36
	3/4	Short	22	11	60	53	1.04 to 2.83
IF3□1-10	1	Short	20	10	60	55	0.56 to 1.67
	1 1/4	Short	34	17	100	90	0.57 to 1.67
	1 1/2	Short	52	26	160	140	0.63 to 1.95
	2	Medium	45	23	140	125	0.34 to 1.06
	2 1/2	Medium	90	45	280	250	0.41 to 1.29
	3	Length	80	40	250	220	0.26 to 0.81
	4	Length	170	85	550	480	0.33 to 1.05
	5	Length	300	150	1,000	870	0.37 to 1.24
	6	Length	460	230	1,500	1,300	0.40 to 1.32
IF3□3-10	1	Short	36	18	110	100	1.00 to 3.05
	1 1/4	Short	54	27	160	140	0.90 to 2.67
	1 1/2	Short	90	45	270	230	1.10 to 3.29
	2	Medium	90	45	270	230	0.68 to 2.05
	2 1/2	Medium	160	80	500	420	0.74 to 2.30
	3	Length	160	80	500	420	0.52 to 1.63
	4	Length	320	160	1,000	800	0.61 to 1.91
	5	Length	560	280	1,800	1,450	0.69 to 2.23
	6	Length	800	400	2,600	2,000	0.70 to 2.28

ON flow rate: Flow rate at which the micro switch operates when the flow rate increases
OFF flow rate: Flow rate at which the micro switch operates when the flow rate decreases

* The maximum flow rate is twice the maximum ON flow rate.
* The above data is for reference only. The operating flow rate may differ from the above values due to the threaded depth, orientation, piping conditions and individual product variations during installation, therefore, due care is needed to use it near the minimum and maximum values of each set flow rate adjustment range.

Change in ON flow rate due to pressure (Typical value)

Graph of change in ON flow rate with pressure (typical value)

Flow rate-pressure drop curve (Typical value)

Graph of flow rate-pressure drop curve (typical value)

Dimensions

(Units: mm)

Open type: Dimensional drawing of 300, 301, 303

Part number	Dimensions
Part number	Connection port size	A	B	C	D	E	F
IF300	3/4	28	31	34	22	137	101
IF301	1	37	62	89	28	188	98
IF303	1	29	39	56	28	155	98

Drip-proof/rain-proof type: Dimensional drawing of 310, 311, 313

Part number	Dimensions
Part number	Connection port size	A	B	C	D	E	F
IF310	3/4	28	31	34	22	137	101
IF311	1	37	62	89	28	188	98
IF313	1	29	39	56	28	155	98

Splash-proof/water-jet-protection type: Dimensional drawing of 320, 321, 323

Part number	Dimensions
Part number	Connection 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

Flow rate-velocity diagram (* Typical value)

Graph of flow rate-velocity

* The number in parentheses indicates the inner diameter of the gas pipe

Notes

Installation/wiring

1.Screw in the arrow on the cover according to the flow of fluid. The screw-in depth should be 9 mm ± 1 mm for 3/4B and 11 mm ± 1.2 mm for 1B.
2.The mounting direction can only be vertical to the horizontal pipe.
3.Before and after the pipe on which the product is mounted, a straight section that is 5 times or more the opening diameter of the pipe should be provided in order to keep away as far as possible from anything that disturbs the flow such as elbows and valves.
4.Each model comes with 3 types of paddles, short, medium and long. Use one paddle according to the pipe size and the set flow rate.
5.IF3 * If the long paddle is mounted to the O type, the pipe may contact the tip of the paddle. This is because the gap between the paddle and the pipe is reduced to detect a small flow rate. Therefore, if the paddle comes in contact, please make alteration to the paddle tip.
6.If any piping such as one not in line with standards is used, the paddle may come into contact with the pipe. In that case, perform alteration to the paddle.
7.It cannot be used when water hammer or pulsating pressure is applied to the fluid.
8.Wire the micro switch according to the symbols on the upper insulator. (It is the opposite of the terminal symbol on the micro switch. The terminals are screw terminals. )
9.The screws used for the terminal are M4.
10.Use JIS standard products for mounting piping fittings. Please use commercially available reducing tee for 1 1/4B to 3B. For 4B to 6B, cut the 1B socket in half and weld it.

Compatible fitting

(Units: mm)

1 1/4B to 3B

Piping B	Reducing tee B
1 1/4	1 1/4 × 1 1/4 × 1
1 1/2	1 1/2 × 1 1/2 × 1
2	2 × 2 × 1
2 1/2	2 1/2 × 2 1/2 × 1
3	3 × 3 × 1

Reducing tee: JIS B 2301
Socket: JIS B 2302
Tube: JIS B 3452

For 4B to 6B

Applicable fitting (For 4B to 6B)

Internal wiring diagram

Symbol	Contact
C	COMMON
A	NORMALLY OPEN
B	NORMALLY CLOSED

*See the SMC catalog for information other than that detailed above.
*Product pictures are representative images.

Data to be displayed: 30; 45; 60

Part Number
IF310-06-11-Q
IF311-10-01-Q
IF311-10-11-Q
IF321-10-11-Q

Standard Unit Price	Minimum order quantity	Standard Shipping Days ?	Flow Rate Range (Max. Value) (L/min)	Output Method	Pipe Port Type	Plumbing Thread Type	Nominal Pipe Thread Size	No. of Outputs	Liquid contact parts material	Applicable Fluid	Rating Flow Range (L/min)	Details Type	Liquid contact parts seal material	Contact configuration	CE compliant
310.10 €	1	16 Days	-	-	Female Thread	[Rc (R)] R	[3/4] 3/4	-	[Stainless Steel] Stainless Steel (EN 1.4301 Equiv.)	-	14 to 60	Drip Proof/Rain Proof	FPM	-	CE Marked
137.18 €	1	4 Days	-	-	Female Thread	[Rc (R)] R	[1] 1	-	[Copper Alloy] Copper Alloy	-	20 to 1500	Drip Proof/Rain Proof	FPM	-	CE Marked
310.10 €	1	12 Days	-	-	Female Thread	[Rc (R)] R	[1] 1	-	[Stainless Steel] Stainless Steel (EN 1.4301 Equiv.)	-	20 to 1500	Drip Proof/Rain Proof	FPM	-	CE Marked
379.11 €	1	26 Days	-	-	Female Thread	[Rc (R)] R	[1] 1	-	[Stainless Steel] Stainless Steel (EN 1.4301 Equiv.)	-	20 to 1500	Jet Proof/Splash Proof	FPM	-	CE Marked

Basic information

Type	Flow Switch	Fluid Type	Water / Coolant	Sensor/Monitor Configuration	Integrated Type
Fluid Characteristics	Noncorrosive

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Basic Attributes

Flow Rate Range (Max. Value)(L/min)
- 50～Less than 100
- 500～Less than 5000
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Output Method
- Switch
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Plumbing Thread Type
- Rc (R)
  - R
- NPT
  - NPT
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Nominal Pipe Thread Size
- 3/4
  - 3/4
- 1
  - 1
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No. of Outputs
- 1
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Liquid contact parts material
- Copper Alloy
  - Brass•Phosphor Bronze
  - Copper Alloy
- Stainless Steel
  - Stainless Steel (EN 1.4301 Equiv.)
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Applicable Fluid
- Liquid that does not corrode SUS304
- Water and non corrosive liquid
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Rating Flow Range(L/min)
- 14 to 60
- 20 to 1,500
- 20 to 1500
- 36 to 2,600
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Details Type
- Drip-proof/rainproof type (equivalent to IP42)
- Splash-proof/water-jet-protection type (IP44 equivalent)
- Drip Proof/Rain Proof
- Jet Proof/Splash Proof
- Open type
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Liquid contact parts seal material
- FPM
- NBR
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Contact configuration
- 1ab
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CE compliant
- CE-compliant product
- CE Marked
- Non-Compatible
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Type
- IF300
- IF301
- IF303
- IF310
- IF311
- IF313
- IF320
- IF321
- IF323
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Pipe Port Type
- Threads
  - Male thread
- Female Thread
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