3/8 Pipe Size Flow Switches

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18 Products

About Flowmeters and Totalizers

Flowmeters measure the rate of flow for a liquid or a gas. Totalizers measure the cumulative flow volume. Flowmeter/totalizers display both the flow rate and the cumulative flow volume.

Fixed-Setpoint Flow Switches

Since they come factory set to a specific set point, these switches are easier to install than adjustable flow switches. As flowing liquid pushes an internal piston, the switch reads the position of the piston to measure the flow. When the piston passes the set point, the switch actuates. They’re accurate in any mounting orientation.

These switches are calibrated with and measure water accurately. They can also be used with other liquids by applying your liquid’s specific-gravity conversion factor to calculate the new set point.

Choose a fitting material that is compatible with the liquid you intend to run through your line. Polypropylene and PPS plastic fittings work with a wide range of chemicals. However, they can crack from impact or when overtightened.

SPST (single pole, single throw) switches turn one device from off to on (normally open).

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

Straight

Polypropylene Plastic Body with Male Fittings

Polypropylene Plastic Body with Polypropylene Plastic Fittings
Pipe Size	Thread Type	Gender	Set Point, gpm	Approx. Difference Between Setpoint and Reset Point, gpm	Max. Pressure	Temp. Range, °F	Max. Switching Current @ Voltage	End-to-End Lg.	Mounting Orientation		Each
SPST
3/8	NPT	Male	0.25	0.05	125 psi @ 70 ° F	33° to 212°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	4"	Any	00000000	000000
3/8	NPT	Male	0.5	0.1	125 psi @ 70 ° F	33° to 212°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	4"	Any	00000000	00000
3/8	NPT	Male	1	0.2	125 psi @ 70 ° F	33° to 212°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	4"	Any	00000000	00000
3/8	NPT	Male	1.5	0.3	125 psi @ 70 ° F	33° to 212°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	4"	Any	00000000	00000
3/8	NPT	Male	2	0.4	125 psi @ 70 ° F	33° to 212°	400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC	4"	Any	00000000	00000

Fixed-Setpoint High-Pressure Flow Switches

Quicker to install than adjustable flow switches in high-pressure lines, these switches come factory-set to activate or deactivate equipment at a specific level. They compensate for the viscosity and density changes of liquid. As flowing liquid pushes an internal piston, the switch reads the piston's position to measure the flow. When the piston passes the set point, the switch actuates. All measure flow correctly no matter their mounting orientation.

These switches are calibrated with water. They can also be used with other liquids by applying your liquid’s specific-gravity conversion factor to calculate the new setpoint.

SPST (single pole, single throw) switches turn one device from off to on (normally open).

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

Straight

SPST
Pipe Connections	Set Point, gpm	Approximate Difference Between Setpoint and Reset Point, gpm	Max. Pressure	Temp. Range, °F	Max. Switching Current	End-to-End Lg.		Each
Brass Body with Brass Fittings
3/8 NPT Male	0.25	0.05	1500 psi @ 70° F	-20° to 275°	0.4 A @ 30 V AC 0.17 A @ 120 V AC 0.08 A @ 240 V AC 0.3 A @ 30 V DC 0.13 A @ 120 V DC 0.06 A @ 240 V DC	3 7/16"	0000000	0000000
3/8 NPT Male	0.5	0.1	1500 psi @ 70° F	-20° to 275°	0.4 A @ 30 V AC 0.17 A @ 120 V AC 0.08 A @ 240 V AC 0.3 A @ 30 V DC 0.13 A @ 120 V DC 0.06 A @ 240 V DC	3 7/16"	0000000	000000
3/8 NPT Male	1	0.2	1500 psi @ 70° F	-20° to 275°	0.4 A @ 30 V AC 0.17 A @ 120 V AC 0.08 A @ 240 V AC 0.3 A @ 30 V DC 0.13 A @ 120 V DC 0.06 A @ 240 V DC	3 7/16"	0000000	000000
3/8 NPT Male	1.5	0.3	1500 psi @ 70° F	-20° to 275°	0.4 A @ 30 V AC 0.17 A @ 120 V AC 0.08 A @ 240 V AC 0.3 A @ 30 V DC 0.13 A @ 120 V DC 0.06 A @ 240 V DC	3 7/16"	0000000	000000
3/8 NPT Male	2	0.4	1500 psi @ 70° F	-20° to 275°	0.4 A @ 30 V AC 0.17 A @ 120 V AC 0.08 A @ 240 V AC 0.3 A @ 30 V DC 0.13 A @ 120 V DC 0.06 A @ 240 V DC	3 7/16"	0000000	000000
316 Stainless Steel Body with 316 Stainless Steel Fittings
3/8 NPT Male	0.25	0.05	1500 psi @ 70° F	-20° to 275°	0.4 A @ 30 V AC 0.17 A @ 120 V AC 0.08 A @ 240 V AC 0.3 A @ 30 V DC 0.13 A @ 120 V DC 0.06 A @ 240 V DC	3 7/16"	0000000	000000
3/8 NPT Male	0.5	0.1	1500 psi @ 70° F	-20° to 275°	0.4 A @ 30 V AC 0.17 A @ 120 V AC 0.08 A @ 240 V AC 0.3 A @ 30 V DC 0.13 A @ 120 V DC 0.06 A @ 240 V DC	3 7/16"	0000000	000000
3/8 NPT Male	2	0.4	1500 psi @ 70° F	-20° to 275°	0.4 A @ 30 V AC 0.17 A @ 120 V AC 0.08 A @ 240 V AC 0.3 A @ 30 V DC 0.13 A @ 120 V DC 0.06 A @ 240 V DC	3 7/16"	0000000	000000

Flow Transmitters

Send flow rate measurements to monitor and control equipment. Also known as transducers, these transmitters convert flow rate measurements to an electrical signal that can be interpreted by receiving devices, such as remote displays and programmable logic controllers (PLCs). As flow increases, the output signal increases. For your receiving device to interpret the signal, you will need to calibrate it for the measurement range and output signal of the transmitter. They only give accurate readings within the rated measurement range. Mount them directly inline with your system. They measure flow correctly no matter their mounting orientation.

These transmitters 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.

Turbine transmitters measure flow by counting how many times their turbine turns as liquid passes through. To avoid clogging the turbine and other damage, use them only with clean, low-viscosity liquids. The digital output sends flow data with a pulse, which is a spike of voltage. The higher the flow, the more pulses they send. The voltage of the pulse output matches the input voltage sent to the transmitters. These transmitters meet NSF/ANSI 61 for use with drinking water.

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

Turbine Flow Measurement

With Turbine Flow Measurement

One 4-20mA Analog Transmitter/Digital Pulse Output—Wire Leads
Pipe Connections	Flow Range, gpm	End-to-End Lg.	Accuracy	Max. Pressure	Temp. Range, °F	Input Voltage	Mounting Orientation	Field Recalibratable	Maximum Output Current		Each
Polyamide Plastic Body with Polyamide Plastic Fittings
3/8 NPT Male	0.13 to 1.3	2 5/32"	±3%	362 psi @ 212 ° F	-4° to 212°	5 to 24V DC	Any	No	20mA	00000000	000000
3/8 NPT Male	0.26 to 4	2 5/32"	±3%	362 psi @ 212 ° F	-4° to 212°	5 to 24V DC	Any	No	20mA	00000000	00000
3/8 NPT Male	0.53 to 9.2	2 5/32"	±3%	362 psi @ 212 ° F	-4° to 212°	5 to 24V DC	Any	No	20mA	00000000	00000
Brass Body with Brass Fittings
3/8 NPT Male	0.5 to 2.11	2 5/32"	±3%	362 psi @ 212 ° F	-4° to 212°	5 to 24V DC	Any	No	20mA	00000000	000000
3/8 NPT Male	0.8 to 6.6	2 5/32"	±3%	362 psi @ 212 ° F	-4° to 212°	5 to 24V DC	Any	No	20mA	00000000	000000