Paddle Flow Switches | McMaster-Carr

	Pipe Size Pipe Size

1/2

3/4

1 1/2

	For Use With For Use With

	Connection Style Connection Style


Threaded	Socket Weld

	Body Material Body Material

	Mounting Location Mounting Location

Insertion

Side

Top

	Shape Shape


Straight	90° Elbow

	Voltage Voltage

120V AC

240V AC

	Maximum Temperature Maximum Temperature

	Connection Type Connection Type

Pipe

Conduit

	Paddle Material Paddle Material

Stainless Steel

Plastic

	Maximum Pressure Maximum Pressure

	Gender Gender

Male

Female

	Set Point Configuration Set Point Configuration

Adjustable

Nonadjustable

	Specifications Met Specifications Met

CE Marked

CSA

	Environment Environment

	Mounting Orientation Mounting Orientation

Horizontal

Vertical

	Electrical Connection Type Electrical Connection Type

	Current Current

	Switch Starting Position Switch Starting Position

1 Off (Normally Open) or 1 On
(Normally Closed)

1 Off (Normally Open)

2 Off (Normally Open) or 2 On
(Normally Closed)

	Number of Circuits Controlled Number of Circuits Controlled

	Maximum Set Point Maximum Set Point

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Minimum Set Point Minimum Set Point

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21 Products

Insertion Flow Switches for Water

Install these switches in tees or pipe outlets to detect the flow rate of liquid in contact with the sensing paddle. They activate or deactivate equipment when the flow rate reaches your set point. Switches are single pole, double throw (SPDT) and can be installed to turn one circuit from “off” to “on” (normally open) or from “on” to “off” (normally closed). They come with four sensing paddles that can be trimmed to fit a range of pipe sizes. The flow rate varies based on the pipe size and paddle used.

Switch with a 316 stainless steel body is more corrosion resistant than switches with a brass body.

Switch with an enclosure that meets NEMA 4X provides protection from dirt, washdowns, and corrosive liquids.

For technical drawings and 3-D models, click on a part number.

Brass Body
Pipe Size	Thread Type	Gender	For Pipe Size	Set Point, gpm	Max. Pressure	Temp. Range, °F	Voltage	Current	Body Ht.	Environmental Rating	Specifications Met		Each
1	NPT	Male	1 to 6	5 to 245	160 psi @ 70° F	33° to 225°	120V AC/ 240V AC	7.4 A @ 120 V AC	5"	NEMA 4X	C-UL Listed, UL Recognized Component	000000	0000000
1	NPT	Male	1 to 6	6 to 166	160 psi @ 70° F	33° to 300°	120V AC/ 240V AC	7.4 A @ 120 V AC	5"	__	C-UL Listed, UL Listed	000000	000000
316 Stainless Steel Body
1	NPT	Male	1 to 6	6 to 166	160 psi @ 70° F	33° to 300°	120V AC/ 240V AC	7.4 A @ 120 V AC	5"	__	C-UL Listed, UL Listed	000000	000000

Compact Insertion Flow Switches for Water

With Socket-Weld Connection

With Threaded Connection

At half the height of standard insertion flow switches, these are often installed in tees or pipe outlets in low-clearance areas. They’re installed in tees or pipe outlets to detect the flow rate of liquid in contact with the sensing paddle. They activate or deactivate equipment when the flow rate reaches your set point. Switches are single pole, double throw (SPDT) and can be installed to turn one circuit from “off” to “on” (normally open). The flow rate varies based on the pipe size and the paddle length.

Maximum flow rate is how much water can temporarily flow through your pipe without damaging the switch.

Switches with a socket-weld connection are for use with unthreaded male pipe. Those with a threaded connection are for use with NPT female pipe.

Switches with a trimmable paddle can be cut to fit a range of pipe sizes. Those with a 301 stainless steel paddle can be used with higher maximum flow rates than switches with a Noryl plastic paddle.

For technical drawings and 3-D models, click on a part number.

Noryl Plastic Body
Pipe Size	Thread Type	Gender	For Pipe Size	Set Point, gpm	Set Point Adjustment Method	Paddle Material	Max. Flow Rate, gpm	Max. Pressure	Temp. Range, °F	Voltage	Current	Body Ht.	Environmental Rating		Each
Socket-Weld Connection
1/2	__	__	1/2	0.97 to 1.03	__	Noryl Plastic	7.9	160 psi @ 70 ° F	-13° to 212°	120V AC/ 240V AC	1 A @ 120 V AC	2 1/2"	IP65	00000000	0000000
3/4	__	__	3/4	1.87 to 1.94	__	Noryl Plastic	21	160 psi @ 70 ° F	-13° to 212°	120V AC/ 240V AC	1 A @ 120 V AC	2 1/2"	IP65	00000000	000000
3/4	__	__	1 1/2 to 3	2.6 to 50	Trimmable Paddles	301 Stainless Steel	650	160 psi @ 70 ° F	-13° to 212°	120V AC/ 240V AC	1 A @ 120 V AC	2 1/2"	IP65	00000000	000000
3/4	__	__	1 1/2 to 3	8 to 23	Trimmable Paddles	Noryl Plastic	390	160 psi @ 70 ° F	-13° to 212°	120V AC/ 240V AC	1 A @ 120 V AC	2 1/2"	IP65	0000000	000000
1	__	__	1	2.4 to 2.7	__	Noryl Plastic	40	160 psi @ 70 ° F	-13° to 212°	120V AC/ 240V AC	1 A @ 120 V AC	2 1/2"	IP65	00000000	000000
Threaded Connection
1/2	NPT	Male	3/4 to 8	4 to 240	Trimmable Paddles	Noryl Plastic	1,100	160 psi @ 70 ° F	-13° to 212°	120V AC/ 240V AC	1 A @ 120 V AC	2 1/2"	IP65	0000000	000000
1/2	NPT	Male	1 1/2 to 3	2.6 to 176	Trimmable Paddles	301 Stainless Steel	650	160 psi @ 70 ° F	-13° to 212°	120V AC/ 240V AC	1 A @ 120 V AC	2 1/2"	IP65	00000000	000000

Hazardous Location Insertion Flow Switches for Water, Oil, Air, and Inert Gas

For installation in environments with flammable gases and combustible dust, these flow switches are UL listed for hazardous locations. They meet NEC Class I, Divisions 1 and 2, Groups C and D; and NEC Class II, Divisions 1 and 2, Groups E, F, and G. They’re installed in tees or pipe outlets to detect the flow rate of liquid in contact with the sensing paddle. Switches activate or deactivate equipment when the flow rate reaches your set point. All come with five sensing paddles that can be trimmed to fit a range of pipe sizes. The flow rate varies based on the pipe size and paddle used.

SPDT switches control one circuit. They can be installed to turn the circuit from “off” to “on” (normally open) or from “on” to “off” (normally closed).

DPDT switches control two circuits. They can be installed to turn both circuits from “off” to “on” (normally open) or from “on” to “off” (normally closed).

Switches with a 316 stainless steel body are more corrosion resistant than switches with a brass body.

For technical drawings and 3-D models, click on a part number.

				Set Point						Conduit
Pipe Size	Thread Type	Gender	For Pipe Size	For Water and Oil, gpm	For Air and Inert Gas, scfm	Max. Pressure	Temp. Range, °F	Voltage	Current	Trade Size	Thread Type	Gender	Body Ht.		Each
SPDT
Brass Body
1 1/2	NPT	Male	1 1/2 to 20	3 to 2,400	17 to 10,000	1000 psi @ 70° F	-4° to 275°	120V AC 240V AC	10 A @ 120 V AC	3/4	NPT	Female	8"	00000000	0000000
316 Stainless Steel Body
1 1/2	NPT	Male	1 1/2 to 20	3 to 2,400	17 to 10,000	2000 psi @ 70° F	-4° to 275°	120V AC 240V AC	10 A @ 120 V AC	3/4	NPT	Female	8"	00000000	000000
DPDT
Brass Body
1 1/2	NPT	Male	1 1/2 to 20	3 to 2,400	17 to 10,000	1000 psi @ 70° F	-4° to 275°	120V AC 240V AC	10 A @ 120 V AC	3/4	NPT	Female	8"	00000000	000000
316 Stainless Steel Body
1 1/2	NPT	Male	1 1/2 to 20	3 to 2,400	17 to 10,000	2000 psi @ 70° F	-4° to 275°	120V AC 240V AC	10 A @ 120 V AC	3/4	NPT	Female	8"	00000000	000000

Level Switches for Dry Materials

When dry material rises to the level of the rotating paddle, these switches actuate. All are rated NEMA 4X and IP66 for protection from corrosion and washdowns.

Switches with auxiliary SPDT relay activate an alarm (not included).

For technical drawings and 3-D models, click on a part number.

Level Switches

Horizontal Side Mount

Vertical Top Mount

							Paddle
Current	Max. Pressure	Temp. Range, °F	Insertion Dp.	Switch Starting Position	Industry Designation	Paddle Speed, rpm	Lg.	Wd.	Features	Environmental Rating	Specifications Met		Each
Horizontal Side Mount—0-30 lbs. per cu. ft. Capacity
8 A @ 120 V AC	30 psi @ 70° F	-40° to 110°	6 5/8"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	1	7"	2"	Auxiliary SPDT Relay LED Alarm Status Indicator LED Power Indicator	IP66, NEMA 4X, NEC Class I Divisions 1, 2 Groups C, D, NEC Class II Divisions 1, 2 Groups E, F, G	UL Listed C-UL Listed	00000000	0000000
20 A @ 120 V AC	30 psi @ 70° F	-40° to 110°	6 5/8"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	1	7"	2"	__	IP66, NEMA 4X, NEC Class I Divisions 1, 2 Groups C, D, NEC Class II Divisions 1, 2 Groups E, F, G	UL Listed C-UL Listed	00000000	000000
Vertical Top Mount—30-70 lbs. per cu. ft. Capacity
8 A @ 120 V AC	30 psi @ 70° F	-40° to 110°	12"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	1	5"	1 1/2"	Auxiliary SPDT Relay LED Alarm Status Indicator LED Power Indicator	IP66, NEMA 4X, NEC Class I Divisions 1, 2 Groups C, D, NEC Class II Divisions 1, 2 Groups E, F, G	UL Listed C-UL Listed	00000000	000000
20 A @ 120 V AC	30 psi @ 70° F	-40° to 110°	12"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	1	5"	1 1/2"	__	IP66, NEMA 4X, NEC Class I Divisions 1, 2 Groups C, D, NEC Class II Divisions 1, 2 Groups E, F, G	UL Listed C-UL Listed	00000000	000000

Replacement Paddles for Horizontal Side Mount Level Switches

Paddle Material		Each
316 Stainless Steel	00000000	000000

Replacement Motors for 20 A @ 120 V AC Level Switches

Voltage	Includes		Each
120V AC	Bracket, Washer	00000000	0000000

Airflow-Actuated HVAC Switches

Use this switch to sense changes in airflow velocity in duct. The paddle extends into the duct and actuates the switch when airflow reaches the setpoint. Switch is rated NEMA 3R for protection from dirt, falling liquids, and light splashing.

							Paddle
Setpoint, fpm	Temperature Range, °F	Current	Electrical Connection Type	Switch Type	For Conduit Trade Size	Knockout Dia.	Material	Ht.	Wd.	For Use Outdoors	Environmental Rating	Specifications Met		Each
Paddle Sensor
350-500	32° to 104°	10 A @ 240 V AC 16 A @ 120 V AC	Screw Terminal	SPDT	1/2	7/8"	Stainless Steel	6 7/8"	3 1/8"	Yes	IP43, NEMA 3R	UL Listed, C-UL Listed, CE Marked	0000000	0000000