3 Pipe Size Flowmeters | McMaster-Carr

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16 Products

Easy Read Flowmeters


Style B—Left to Right	Style B—Right to Left

Style B—Bottom to Top	Style B—Top to Bottom

A large dial instead of a scale makes it easier to read the flow rate from a distance. As liquid flows through these flowmeters, it pushes a needle along the dial, showing you the flow rate. They measure flow correctly no matter the mounting orientation.

These flowmeters are calibrated with water but can be used with other liquids. If you’re using these with a liquid other than water, you’ll need to calculate the flow rate by multiplying the number shown on the scale by the specific-gravity conversion factor for your liquid.

Choose a direction of flow that matches your pipe system, so you don't have to tilt your head to read the dial.

Choose a fitting material that is compatible with the liquid you're running through your line.

Bronze Fitting—Bronze fittings resist impact better than PVC fittings.

Style B—Style B flowmeters should be installed away from other fittings to get the most accurate reading. To determine how far away from the fittings it should be, take your pipe's diameter and multiply it by 10.

								Temp., ° F
	Style	Flow, gpm	Dial Size	End-to-End Lg.	Overall Ht.	Accuracy	Max. Pressure @ Temp.	Min.	Max.	Seal Material	Mounting Position	Choose a Direction of Flow		Each
Bronze Body with Bronze Fittings







				3 NPT Female

				B	40 to 300	3 1/2"	9 13/16"	9 13/16"	±3%	180 psi @ 70° F	-30	212	Buna-N	Any Angle	Left to Right, Right to Left, Bottom to Top, Top to Bottom	9858K57	000000000

Easy-Read Flowmeters for Gases

Instead of a scale, these flowmeters have a large dial that makes it easy to read the flow rate of your gas from a distance. As gas flows through, it pushes a needle along the dial, showing you the flow rate.

These flowmeters are calibrated with air but can be used with other gases. If you’re using these with a gas other than air, you’ll need to calculate the flow rate by multiplying the number shown on the scale by the specific-gravity conversion factor for your gas.

Bronze Body with Bronze Fittings


Female Left to Right	Female Right to Left	Female Bottom to Top	Female Top to Bottom

Flowmeters with a bronze body should be installed away from other fittings to get the most accurate reading. To determine how far away from the fittings it should be, take your pipe's diameter and multiply it by 10. Choose a direction of flow that matches your pipe system, so you don't have to tilt your head to read the dial.

						Temp., ° F					3 1/2" Dial Size
	Flow, scfm	End-to-End Lg.	Overall Ht.	Accuracy	Max. Pressure @ Temp.	Min.	Max.	Seal Material	Mounting Position	Choose a Direction of Flow		Each
3 NPT Female



		300 to 2,000	4 9/16"	9 13/16"	±3%	180 psi @ 70° F	-30	212	Buna-N	Any Angle	Left to Right, Right to Left, Bottom to Top, Top to Bottom	42005K37	000000000

Build-Your-Own Flanged Pipe Flow Transmitters

Components Sold Separately (Pipe Flanges

Not Included)

Install these transmitters between two flanges in a flanged pipe system to measure flow rate and send the data to a remote display or programmable logic controller (PLC). For easy cleaning and maintenance, you can slide the transmitter out from between the flanges. A complete transmitter consists of a flow transmitter, display, and mounting hardware kit (all components sold separately). Flowing liquid turns the turbine in the transmitter, while the easy-to-read display counts the number of turns to measure and transmit the flow. The display also shows total and batch flow volumes. Use these transmitters with clean, low-viscosity liquids to avoid clogging or other damage to the internal parts. Mount them inline with your pipe system. They’re accurate in any mounting orientation.

Also known as transducers, these transmitters help you monitor status or control equipment by converting measurements to a digital pulse that can be interpreted by receiving devices. Each pulse is a spike of voltage. The higher the flow, the more pulses they send. For your receiving device to interpret the signal from the transmitter, you will need to calibrate it for the measurement range and output signal of the transmitter. Transmitters will only provide accurate readings within the rated measurement range.

The transmitters are calibrated with water but can be used with other liquids.

Flow Transmitters

					Flange
	Flow Measurement Type	Pipe Size	Flow Range, gpm	Bore Size	OD	Type	For Flange ANSI Class	End-to-End Lg.	Accuracy	Max. Pressure @ Temp.	Temp. Range, ° F	Mounting Position	Field Recalibratable	Pulse Frequency per Volume, pulse per gal.		Each
One Digital Pulse Output—2-Pin BNC Connection Plug







				316/316L Stainless Steel Body with 316/316L Stainless Steel Fitting

				Turbine	3	60 to 600	3"	5"	Round	150	4 1/4"	±1.0%	285 psi @ 70° F	-150 to 350	Any Angle	No	50	4408N14	000000000

Flow Transmitter Repair Kits

For Pipe Size	For Bore Size	For Flange ANSI Class	Includes		Each
3	3"	150	6 Screws, 2 Rotor Supports, One Rotor Assembly, One K-Factor Tag	4408N23	000000000

Mounting Hardware Kits

Image of Product. Front orientation. Flow Transmitters. Build-Your-Own Flanged Pipe Flow Transmitters, Mounting Hardware.

For Flange ANSI Class	Includes		Each



3	150	4 Studs, 12 Nuts, 2 Gaskets, 2 Centering Rings	4408N17	0000000

Flanged Flowmeter/Totalizers


	Replacement Displays

Using the flanged ends, securely install these flowmeter/totalizers in large, high-flow pipelines to measure the flow rate and total volume of liquid flowing through. They use ultrasonic waves to measure flow, so they don’t have any internal moving parts that can break or get stuck. You can reset the batch total, but you can't reset the cumulative total. They measure accurately in any mounting orientation.

These flowmeter/totalizers are calibrated with water.

	Flowmeter/Totalizers															Replacement Displays
												Flowmeter/Totalizers
							Max. Volume Displayed					Temp., ° F
	Connections	Flow, gpm	Flange OD	For Flange ANSI Class	End-to-End Lg.	Accuracy	Total	Batch	Max. Pressure @ Temp.	Mounting Position	Batteries Included	Min.	Max.		Each	Display Type		Each
Ultrasonic Flow Measurement







				PVC Body with PVC Fittings and EPDM Seal

				3 Pipe Size	2.06 to 309	7 1/2"	150	13 1/4"	±2%	999,999 Gallons	999,999 Gallons	200 psi @ 70° F	Any Angle	Yes	32	140	3777K61	000000000	Digital	3777K615	0000000

Flanged Totalizers for Drinking Water


Bronze Body Round Flange	Bronze Body Analog Display

Flanged ends let you securely integrate these totalizers into large drinking water pipelines to measure the cumulative amount of water flowing through them. They meet NSF/ANSI 61, so they're safe to use with drinking water. They measure flow volume by counting how many times their turbine turns as liquid flows through. To avoid clogging the turbine and other damage to the sensor, use them only with clean, low-viscosity liquids. Their total cannot be reset.

These totalizers 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.

		Flange							Temp., ° F					Bolt
	Connections	OD	Type	Flow, gpm	Maximum Total Volume Displayed	End-to-End Lg.	Accuracy	Max. Pressure @ Temp.	Min.	Max.	Seal Material	Mounting Position	Display Type	Hole Dia.	Circle Dia.	No. of Holes		Each
Bronze Body with Brass Fittings



		3 Pipe Size	7 1/2"	Round	5 to 530	99,999,000 Gallons	12"	±1.5%	175 psi @ 70° F	33	150	Buna-N	Horizontal	Analog	3/4"	6"	4	4189K32	000000000

Insertion Flowmeters

No need to disassemble your PVC pipeline—insert these flowmeters into a drilled hole and secure them using the included clamps. As liquid flows through the meter, it pushes an indicator up the scale, showing you the flow rate. They have a clear body, so you can check the color and clarity of flowing liquid to identify and diagnose problems. Mount these flowmeters vertically.

		Flow for Pipe Schedule, gpm					Temp., ° F
	Pipe Size	Schedule 40	Schedule 80	Overall Ht.	Accuracy	Max. Pressure @ Temp.	Min.	Max.	Seal Material	Mounting Position		Each
Acrylic Plastic Body with 316 Stainless Steel Fittings



		3	45 to 240	40 to 215	6"	±10%	75 psi @ 70° F	33	190	Neoprene	Vertical	4349K61	0000000

Any-Orientation Flowmeters

Female

A spring piston instead of a float allows these flowmeters to measure flow rate in any mounting orientation. As liquid passes through, it pushes an indicator up the scale, showing you the flow rate. They have union fittings on both ends, making it easy to position the scale so it’s visible.

Choose a fitting material that is compatible with the liquid you intend to run through your line.

Brass Fitting—Brass fittings resist impact better than polysulfone fittings.

					Temp., ° F
	Flow, gpm	End-to-End Lg.	Accuracy	Max. Pressure @ Temp.	Min.	Max.	Seal Material	Mounting Position		Each
Polysulfone Body with Brass Fittings







				3 NPTF Female

				25 to 275	10 3/4"	±5%	325 psi @ 70° F	33	250	Buna-N	Any Angle	4197K651	000000000

Socket-Connect Flowmeter/Totalizers

Shown with 90°

Display Adapter Kit

Image of Product. Front orientation. Flowmeters. Socket-Connect Flowmeter/Totalizers.

Image of Product. Front orientation. Flowmeter Displays. Socket-Connect Flowmeter/Totalizers, Flowmeter/Totalizers, Digital Display.

Replacement Displays

The unthreaded ends of these flowmeter/totalizers install into a PVC piping system, so you can measure the flow rate and volume of liquid passing through your system. Bond the joint together with PVC cement and primer. You can reset the batch total, but you can't reset the cumulative total. They measure flow correctly no matter the mounting orientation.

These flowmeter/totalizers are calibrated with water.

Ultrasonic Flow Measurement—Ultrasonic flowmeter/totalizers measure flow with ultrasonic waves, so they don’t have internal moving parts that can break or get stuck.

	Flowmeter/Totalizers														Replacement Displays
											Flowmeter/Totalizers
						Max. Volume Displayed					Temp., ° F
	Connections	Flow, gpm	Pipe Schedule	End-to-End Lg.	Accuracy	Total	Batch	Max. Pressure @ Temp.	Mounting Position	Batteries Included	Min.	Max.		Each	Display Type		Each
Ultrasonic Flow Measurement







				PVC Body with PVC Fittings and EPDM Seal

				3 Male	2.06 to 309	80	6 5/8"	±2%	999,999 Gallons	999,999 Gallons	200 psi @ 70° F	Any Angle	Yes	32	140	3777K51	000000000	Digital	3777K615	0000000

Insertion-Mount 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.

Choose a fitting material that is compatible with the liquid you're running through your line.

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

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

Brass Fitting—Brass and 316 stainless steel fittings resist impact better than Noryl fittings.

Noryl Fitting—Noryl fittings work with a wide range of chemicals.

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

	Paddle Material	Max. Pressure @ Temp.	Temp. Range, ° F	Max. Switching Current @ Voltage	Body Ht.	Enclosure Rating	Specs. Met		Each
Noryl Body with 3/4 Socket-Connect Noryl Fittings







	Set-Point-Adjustment Trimmable Paddles

	1 1/2 2 3	7.7 to 19.3 10.3 to 21 16.5 to 52	110; 150; 390	Noryl	160 psi @ 70° F	-13 to 212	1 amp @ 230V AC 1 amp @ 48V DC	2 1/2"	IP65	UL 508	2766K41	0000000


	1 1/2 2 3	7.9 to 15 10 to 22 18 to 50	144; 240; 650	301 Stainless Steel	160 psi @ 70° F	-13 to 212	1 amp @ 230V AC 1 amp @ 48V DC	2 1/2"	IP65	UL 508	2766K111	000000


	Noryl Body with 1/2 NPT Male Threaded Brass Fittings







					Set-Point-Adjustment Trimmable Paddles

					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; 1,100	Noryl	160 psi @ 70° F	-13 to 212	1 amp @ 230V AC 1 amp @ 48V DC	2 1/2"	IP65	UL 508	2766K43	000000


					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; 1,900	301 Stainless Steel	160 psi @ 70° F	-13 to 212	1 amp @ 230V AC 1 amp @ 48V DC	2 1/2"	IP65	UL 508	2766K112	000000

Socket-Connect Flowmeter/Totalizers with Remote Display

Often used in hard-to-access areas, these flowmeter/totalizers have a display that can be placed up to 25 feet from the sensor. Use them to measure the rate and volume of liquid flowing through your system. They measure flow by counting how many times their turbine turns as liquid flows through. To avoid clogging the turbine and other damage to the sensor, use them only with clean, low-viscosity liquids. Batch totals are resettable but can be protected with a security code to prevent tampering. The reset function can also be disabled so that they operate as a cumulative totalizer. Cumulative totals cannot be reset. No matter the mounting orientation, they’ll measure flow correctly.

These flowmeter/totalizers 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 a complete unit, you’ll need a display, a sensor, and a tee fitting.

Tee Fittings

Tee fittings mount inline with your pipe. They have two unthreaded socket ends that bond to unthreaded PVC pipe with PVC cement and primer.

						Temp., ° F
	Inlet/Outlet Connection	Sensor Connection	Pipe Schedule	Flow, gpm	Max. Pressure @ Temp.	Min.	Max.	Mounting Position		Each
PVC Body



		3 Socket Connect Female Inlet Pipe × 3 Socket Connect Female Outlet Pipe	1 1/4 NPSM Threaded Male Pipe	80	23 to 460.8	180 psi @ 70° F	33	149	Any Angle	4114K238	0000000