UL 508 Flow Switches | McMaster-Carr

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7 Products

Insertion Flow Switches

Socket Connection with IP65 Rating

Threaded
Connection
with IP65 Rating

Avoid complicated inline installation—these flow switches insert into a tee or pipe outlet, so you don’t need to disassemble your pipeline. They have a paddle that’s pushed as your liquid moves through to determine flow. When the paddle reaches a set position determined by the set point, it activates or deactivates equipment. They are single pole, double throw (SPDT) and can either turn one device from off to on (normally open) or on to off (normally closed). They should be mounted vertically into a large-diameter horizontal pipeline, so liquid pushes the paddle.

These flow switches are calibrated with water. You can use them with other liquids, but they may not measure accurately if the liquid’s viscosity differs from water.

Switches with a Noryl plastic body have a paddle that you trim to adjust the set point. The more you trim, the higher the set point.

Choose a fitting material that is compatible with the liquid you're running through your line. Noryl plastic fittings work with a wide range of chemicals. Brass and 316 stainless steel fittings resist impact better than Noryl plastic fittings.

Socket-connect flow switches bond to an unthreaded PVC pipe tee or pipe outlet with PVC cement and primer (not included).

IP65 rated switches seal out dust and can be lightly rinsed.

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

Noryl Plastic Body with Noryl Plastic Fittings
Pipe Size	Thread Type	Gender	For Pipe Size	Set Point Range, gpm	Max. Flow Rate, gpm	Set Point Adjustment Method	Paddle Material	Max. Pressure	Temp. Range, °F	Max. Switching Current @ Voltage	Body Ht.	Environmental Rating	Specifications Met		Each
Socket Connection
3/4	__	__	1 1/2 2 3	7.7 to 19.3 10.3 to 21 16.5 to 52	110 150 390	Trimmable Paddles	Noryl Plastic	160 psi @ 70° F	-13° to 212°	1 A @ 230 V AC 1 A @ 48 V DC	2 1/2"	IP65	UL 508	0000000	0000000
3/4	__	__	1 1/2 2 3	7.9 to 15 10 to 22 18 to 50	144 240 650	Trimmable Paddles	301 Stainless Steel	160 psi @ 70° F	-13° to 212°	1 A @ 230 V AC 1 A @ 48 V DC	2 1/2"	IP65	UL 508	00000000	000000
Noryl Plastic Body with Brass Fittings
Threaded Connection
1/2	NPT	Male	1 1/2 2 3 4 8	7.7 to 19.3 10.3 to 21 16.5 to 52 25.5 to 68 126 to 240	110 150 390 420 1100	Trimmable Paddles	Noryl Plastic	160 psi @ 70° F	-13° to 212°	1 A @ 230 V AC 1 A @ 48 V DC	2 1/2"	IP65	UL 508	0000000	000000
1/2	NPT	Male	1 1/2 2 3 4 8	7.9 to 15 10 to 22 18 to 50 25 to 66 114 to 176	144 240 650 800 1900	Trimmable Paddles	301 Stainless Steel	160 psi @ 70° F	-13° to 212°	1 A @ 230 V AC 1 A @ 48 V DC	2 1/2"	IP65	UL 508	00000000	000000

Fixed-Setpoint Insertion Flow Switches

Easy to install, these flow switches come already set to a specific set point and don’t require you to disassemble your pipeline. Instead of mounting them inline, insert them into an unthreaded PVC pipe tee or pipe outlet in large-diameter pipe. They have a paddle that’s pushed as your liquid moves through to determine flow. When the paddle reaches a set position determined by the set point, it activates or deactivates equipment. All are single pole, double throw (SPDT) and can either turn one device from off to on (normally open) or on to off (normally closed). IP rated, they seal out dust and can be lightly rinsed.

They should be mounted vertically into a horizontal pipeline, so liquid pushes the paddle. Secure them with PVC cement and primer (not included).

These flow switches are calibrated with water. You can use them with other liquids, but they may not measure accurately if the liquid’s viscosity differs from water.

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

Noryl Plastic Body
Pipe Size	For Pipe Size	Set Point, gpm	Max. Flow Rate, gpm	Max. Pressure	Temp. Range, °F	Max. Switching Current @ Voltage	Body Ht.	Environmental Rating	Specifications Met		Each
Socket Connection
1/2	1/2	1.03	7.9	160 psi @ 70° F	-13° to 212°	1 A @ 230 V AC, 1 A @ 48 V DC	2 1/2"	IP65	UL 508	00000000	0000000
3/4	3/4	1.94	21	160 psi @ 70° F	-13° to 212°	1 A @ 230 V AC, 1 A @ 48 V DC	2 1/2"	IP65	UL 508	00000000	000000
3/4	1, 1 1/4	2.7, 6.8	31, 40	160 psi @ 70° F	-13° to 212°	1 A @ 230 V AC, 1 A @ 48 V DC	2 1/2"	IP65	UL 508	00000000	000000