1 1/4 Pipe Size Flow Switches

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8 Products

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. Bronze and 316 stainless steel fittings resist impact better than plastic fittings.

SPDT (single pole, double throw) switches can either turn one device from off to on (normally open) or from on to off (normally closed).

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

Straight

Bronze and
Stainless Steel Body
with Female Fittings

								Conduit
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	Trade Size	Thread Type	Gender	End-to-End Lg.	Mounting Orientation		Each
Bronze Body with Bronze Fittings
SPDT
1 1/4	NPT	Female	1	0.15	400 psi @ 70 ° F	-20° to 300°	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	1/2	NPT	Male	4"	Any	00000000	0000000
1 1/4	NPT	Female	4	0.6	400 psi @ 70 ° F	-20° to 300°	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	1/2	NPT	Male	4"	Any	00000000	000000
1 1/4	NPT	Female	20	3	400 psi @ 70 ° F	-20° to 300°	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	1/2	NPT	Male	4"	Any	00000000	000000
316 Stainless Steel Body with 316 Stainless Steel Fittings
SPDT
1 1/4	NPT	Female	1	0.15	400 psi @ 70 ° F	-20° to 300°	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	1/2	NPT	Male	4 1/2"	Any	00000000	00000000
1 1/4	NPT	Female	4	0.6	400 psi @ 70 ° F	-20° to 300°	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	1/2	NPT	Male	4 1/2"	Any	00000000	00000000
1 1/4	NPT	Female	20	3	400 psi @ 70 ° F	-20° to 300°	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	1/2	NPT	Male	4 1/2"	Any	00000000	00000000

Fixed-Setpoint Hazardous Location Flow Switches

Safe to use where flammable gases and combustible dust may be present, these switches activate or deactivate when your flow reaches a factory-set level. All are UL listed for hazardous environments. Because their set point is fixed, they’re ready to go, making them easy to install. They actuate when your flowing liquid or gas pushes their paddle into a set position. These switches are single pole, double throw (SPDT) and can turn one device from off to on (normally open) or from on to off (normally closed). They must be mounted horizontally to function accurately.

These switches are calibrated with water and air. They can also be used with other liquids and gases but may not measure accurately if their viscosity is significantly different.

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

			Set Point						Conduit
Pipe Size	Thread Type	Gender	For Liquids, gpm	For Gases, scfm	Max. Pressure	Temp. Range, °F	Voltage	Max. Switching Current	Trade Size	Thread Type	Gender	End-to-End Lg.		Each
Brass Body
1 1/4	NPT	Female	4	21	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 5/8"	00000000	0000000

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
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	0000000