Flow Switch, Diaphragm Type, IFW5 Series

A pressure switch made by SMC.

[Features]
· Low flow (1 L/min) setting is possible
· Easy to set
It can be set with a screwdriver from the outside without removing the cover
· With light

[Applications]
· Used for detection and confirmation of flow as a general-purpose water cutoff, water reduction relay in cooling water fixtures in general industrial machinery.

(i)Remark

See catalog for specification details.
Product pictures are representations. CAD data is not supported for some model numbers.

Part Number

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Product specification
Part Numbers
Catalog

Specifications of Diaphragm-Type Flow Switch IFW5 Series

External appearance of IFW5 Series

Fluid	Water / Non corrosive liquid*
Operating Pressure	0.1 to 0.6 MPa
Water resistance	1.2 MPa
Operating temperature range	-5 to 60°C (no freezing)
Action	Diaphragm Regulator
Insulation Resistance	100 MΩ or more (500 DC by insulation resistance tester)
Withstand Voltage	1,500 V AC for 1 minute
Contact	Without terminal box: 1ab
Contact	With terminal box: 1a and 1b
Connection port size	3/8, 1/2, 3/4
Liquid-contacting parts material	Body	CAC408
	Rod	C3604B
	Diaphragm	*)NBR

* Please contact the manufacturer support center for further details of use.
*) Select "-X404" for ozone environment.

Model

Model	Set flow rate range L/min	Maximum flow rate L/min	*) Hysteresis L/min
IFW510	1 to 10	20	1 or less
IFW520	10 to 20	25	1.5 or less
IFW550	20 to 50	60	3 or less

*) Hysteresis is the flow rate required to move the micro switch from the operating position (ON signal) to the return position (OFF signal). (Typical value)

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	5	5	1.5	0.7	4	4	2.5	1.3
AC250V	5	5	1	0.5	4	4	1.5	0.8
DC8V	7	5	3	3	5	4	3	3
DC14V	5	5	3	3	4	4	3	3
DC30V	5	5	3	3	4	4	3	3
DC125V	0.4	0.4	0.1	0.1	0.4	0.4	0.1	0.1
DC250V	0.3	0.3	0.05	0.05	0.3	0.3	0.05	0.05

Structure and operating principle diagram

IFW5 Series structure and operating principle diagram

Operating Principle

When water flows, a differential pressure is generated before and after the orifice at the port of body 1. This differential pressure is detected by a pair of upper and lower diaphragms, rod 2 is displaced downward, operating lever 4 is lowered, and the micro switch is turned on.
If the flow rate is increased, the rod will be displaced downwards by 2, and if it is decreased, it will be displaced upwards. In addition, the adjustment gear 5 can be rotated and the gear 3 can be moved vertically to detect signals at any flow rate.

Number	Part Name	Material
1	Body	CAC408
2	Rod	C3604B
3	Gear	POM

Number	Part Name	Material
4	Operating lever	SPCC
5	Adjusting gear	POM

Flow Characteristics (Representative Values)

IFW510 flow rate characteristics (Typical value)

IFW520 flow rate characteristics (Typical value)

IFW550 flow rate characteristics (Typical value)

Dimensions

(Units: mm)

Dimensional drawing of IFW5□0-□□-00 to 04 (without terminal box)

Dimensional drawing of IFW5□0-□□-10 to 24 (with terminal box)

Dimensional drawing of IFW5□0-□□-55 to 86 (with 24 V DC lamp and terminal box)

Internal wiring diagram

Internal wiring diagram of IFW5□0-□□-00, 10, 20

Symbol	Contact	Lead Wire Color
C	COMMON	Black
A	NORMALLY OPEN	White
B	NORMALLY CLOSED	Red

Internal wiring diagram of IFW5□0-□□-01 to 04, 11 to 14, 21 to 24

Symbol	Contact	Lead Wire Color
C	COMMON	Black
A	NORMALLY OPEN	White
B	NORMALLY CLOSED	Red

Notes

Mounting/wiring

* 1Please mount the switch so as to align the arrow on the side of the body with the flow of fluid.
* 2Always fill the flow path with liquid.
* 3The mounting direction can be horizontal or vertical.
* 4Before 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.
* 5For wiring, refer to the above internal wiring diagram or catalog.
* 6If there is no terminal box, select 1a or 1b as the contact for wiring. In that case, the unused lead wires requires to be insulated.
* 7As it is an open type, it cannot be used in a place where water or oil is scattered.
* 8It cannot be used when water hammer or pulsating pressure is applied to the fluid.
* 9A filter of approximately 100 mesh on the inlet side of the flow switch should be installed to prevent malfunction and diaphragm damage due to dust and cutting chips in the fluid.

Adjustment

* 1To set the flow rate, remove the grommet at the top of the cover and turn the flow rate adjustment gear with a straight-slot screwdriver. Turning it clockwise increases the set flow rate, and turning it counterclockwise decreases it.
* 2The flow rate set point is the ON flow rate set point, so for the 1a contact, the ON signal is output when the flow rate exceeds the set flow rate.
* 3In case of 1b contact, the ON signal is output when the flow rate decreases by hysteresis from the set flow rate.
* 4To prevent chattering due to fluctuations in the operating flow rate, make the difference between the set flow rate and the operating flow rate as large as possible.
* 5Use below the maximum operating pressure and flow rate.
* 6The scale on the window name plate is a standard. For precise settings, please mount a flow meter to the outlet side of the flow rate switch. When setting a low flow rate when using at a pressure of 0.2 MPa or more, the indicator needle and scale plate may interfere. In this case, remove the indicator needle and scale plate and set. After setting, attach the indicator needle and scale plate at any positions.

Additional Precautions

*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
IFW510-03-00-Q
IFW510-03-01-Q
IFW510-03-10
IFW510-03-11-Q
IFW510-03-20-Q
IFW510-03-55-Q
IFW510-03-65-Q
IFW510-03-66-Q
IFW510-03-76
IFW510-03-76-Q
IFW510-03-85-Q
IFW510-03-86
IFW510-04-00-Q
IFW510-04-01-Q
IFW510-04-04-Q
IFW510-04-10-Q
IFW510-04-11-Q
IFW510-04-55-Q
IFW510-04-56-Q
IFW510-04-65-Q
IFW510-04-66-Q
IFW510-04-76-Q
IFW510-04-85-Q
IFW510-04-86-Q
IFW510-06-00-Q
IFW510-06-10-Q
IFW510-06-11-Q
IFW510-06-21-Q
IFW510-06-65-Q
IFW510-06-75
IFW510-06-76-Q
IFW510-06-85-Q
IFW510-06-86-Q
IFW520-03-10-Q
IFW520-03-20-Q
IFW520-04-00-Q
IFW520-04-01-Q
IFW520-04-10-Q
IFW520-04-11-Q
IFW520-06-00-Q
IFW520-06-10-Q
IFW520-06-66-Q
IFW520-06-75-Q
IFW520-06-76-Q
IFW520-06-85-Q
IFW550-04-10-Q
IFW550-04-75-Q
IFW550-06-00-Q
IFW550-06-10-Q
IFW550-06-66-Q

Standard Unit Price	Minimum order quantity	Standard Shipping Days ?	Flow Rate Range (Max. Value) (L/min)	Output Method	Plumbing Thread Type	Nominal Pipe Thread Size	No. of Outputs	Applicable Fluid	Rated Pressure Range	Rating Flow Range (L/min)	Contact configuration	Terminal box	Lamp	CE compliant
165.82 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1ab	Without terminal box	Without light	CE-compliant product
184.15 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1ab	Without terminal box	With neon light (110 V AC, red)	CE-compliant product
188.52 €	1	26 Days	-	-	[Rc (R)] Rc	[3/8] 3/8	-	-	-	1 to 10	1a	With terminal box	Without light	None
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box	With neon light (110 V AC, red)	CE-compliant product
188.47 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1b	With terminal box	Without light	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1b	With terminal box (For 24 V DC/+COM)	With LED light (24 V DC, red)	CE-compliant product
206.82 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (For 24 V DC/+COM)	With LED light (24 V DC, red)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (For 24 V DC/+COM)	With LED light (24 V DC, green)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1b	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, green)	Non-Compatible
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1b	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, green)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, red)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (24 V DC / -COM)	With LED light (24 V DC, green)	None
165.82 €	1	4 Days	-	-	[Rc (R)] Rc	[1/2] 1/2	-	-	-	1 to 10	1ab	Without terminal box	Without light	CE Marked
184.19 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1ab	Without terminal box	With neon light (110 V AC, red)	CE-compliant product
184.19 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1ab	Without terminal box	With neon lamp (220 V AC, green)	CE-compliant product
188.47 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box	Without light	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box	With neon light (110 V AC, red)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1b	With terminal box (For 24 V DC/+COM)	With LED light (24 V DC, red)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1b	With terminal box (For 24 V DC/+COM)	With LED light (24 V DC, green)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (For 24 V DC/+COM)	With LED light (24 V DC, red)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (For 24 V DC/+COM)	With LED light (24 V DC, green)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1b	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, green)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, red)	CE-compliant product
206.82 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, green)	CE-compliant product
165.82 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1ab	Without terminal box	Without light	CE-compliant product
188.52 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box	Without light	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box	With neon light (110 V AC, red)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1b	With terminal box	With neon light (110 V AC, red)	CE-compliant product
206.82 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (For 24 V DC/+COM)	With LED light (24 V DC, red)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1b	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, red)	Non-Compatible
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1b	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, green)	CE-compliant product
206.82 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, red)	CE-compliant product
206.61 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	1 to 10	1a	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, green)	CE-compliant product
188.52 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1a	With terminal box	Without light	CE-compliant product
188.52 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/8] 3/8	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1b	With terminal box	Without light	CE-compliant product
165.82 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1ab	Without terminal box	Without light	CE-compliant product
184.19 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1ab	Without terminal box	With neon light (110 V AC, red)	CE-compliant product
188.47 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1a	With terminal box	Without light	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1a	With terminal box	With neon light (110 V AC, red)	CE-compliant product
165.82 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1ab	Without terminal box	Without light	CE-compliant product
188.52 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1a	With terminal box	Without light	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1a	With terminal box (For 24 V DC/+COM)	With LED light (24 V DC, green)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1b	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, red)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1b	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, green)	CE-compliant product
206.89 €	1	26 Days	10～Less than 50	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	10 to 20	1a	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, red)	CE-compliant product
188.52 €	1	26 Days	50～Less than 100	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	20 to 50	1a	With terminal box	Without light	CE-compliant product
206.89 €	1	26 Days	50～Less than 100	Switch	[Rc (R)] Rc	[1/2] 1/2	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	20 to 50	1b	With terminal box (For 24 V DC/-COM)	With LED light (24 V DC, red)	CE-compliant product
165.82 €	1	26 Days	50～Less than 100	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	20 to 50	1ab	Without terminal box	Without light	CE-compliant product
188.52 €	1	26 Days	50～Less than 100	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	20 to 50	1a	With terminal box	Without light	CE-compliant product
206.89 €	1	26 Days	50～Less than 100	Switch	[Rc (R)] Rc	[3/4] 3/4	1	Water / Non corrosive liquid*	0.1 to 0.6 MPa	20 to 50	1a	With terminal box (For 24 V DC/+COM)	With LED light (24 V DC, green)	CE-compliant product

Basic information

Type	Flow Switch	Fluid Type	Water	Sensor/Monitor Configuration	Integrated Type
Pipe Port Type	Female Thread	Fluid Characteristics	Noncorrosive

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50Suggestion of an applicable part number.

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Basic Attributes

Flow Rate Range (Max. Value)(L/min)
- 10～Less than 50
- 50～Less than 100
Clear
Output Method
- Switch
Clear
Nominal Pipe Thread Size
- 3/8
  - 3/8
- 1/2
  - 1/2
- 3/4
  - 3/4
Clear
No. of Outputs
- 1
Clear
Applicable Fluid
- Water / Non corrosive liquid*
Clear
Rated Pressure Range
- 0.1 to 0.6 MPa
Clear
Rating Flow Range(L/min)
- 1 to 10
- 10 to 20
- 20 to 50
Clear
Contact configuration
- 1a
- 1ab
- 1b
Clear
Terminal box
- With terminal box (24 V DC / -COM)
- With terminal box (For 24 V DC/-COM)
- With terminal box (For 24 V DC/+COM)
- With terminal box
- Without terminal box
Clear
Lamp
- With LED light (24 V DC, green)
- With LED light (24 V DC, red)
- With neon light (110 V AC, red)
- With neon lamp (220 V AC red)
- With neon lamp (220 V AC, green)
- Without light
Clear
CE compliant
- CE-compliant product
- CE Marked
- Non-Compatible
- None
Clear
Type
- IFW510
- IFW520
- IFW550
Clear
Plumbing Thread Type
- Rc (R)
  - Rc
- G
  - G
- NPT
  - NPT
Clear
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- 2D
- 3D
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