CSA Certified Flow Switches

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62 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. Polypropylene and PPS plastic fittings work with a wide range of chemicals. However, they can crack from impact or when overtightened. 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	NPT	Female	0.5	0.075	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	3 1/4"	Any	00000000	0000000
1	NPT	Female	1	0.15	300 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	3 3/8"	Any	0000000	000000
1	NPT	Female	2	0.3	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	3 1/4"	Any	00000000	000000
1	NPT	Female	3	0.45	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	3 3/8"	Any	0000000	000000
1	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	3 1/4"	Any	00000000	000000
1	NPT	Female	6	0.9	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	3 1/4"	Any	00000000	000000
1	NPT	Female	8	1.2	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	3 1/4"	Any	00000000	000000
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	000000
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
1 1/2	NPT	Female	1.5	0.225	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	000000
1 1/2	NPT	Female	5	0.75	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	000000
1 1/2	NPT	Female	30	4.5	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	000000
2	NPT	Female	2	0.3	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	5 3/8"	Any	00000000	000000
2	NPT	Female	5	0.75	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	5 3/8"	Any	00000000	000000
2	NPT	Female	50	7.5	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	5 3/8"	Any	00000000	000000
316 Stainless Steel Body with 316 Stainless Steel Fittings
SPDT
1	NPT	Female	0.5	0.075	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	3 1/4"	Any	00000000	000000
1	NPT	Female	2	0.3	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	3 1/4"	Any	00000000	000000
1	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	3 1/4"	Any	00000000	000000
1	NPT	Female	6	0.9	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	3 1/4"	Any	00000000	000000
1	NPT	Female	8	1.2	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	3 1/4"	Any	00000000	000000
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
2	NPT	Female	2	0.3	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	5 3/8"	Any	00000000	00000000
2	NPT	Female	5	0.75	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	5 3/8"	Any	00000000	00000000
2	NPT	Female	50	7.5	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	5 3/8"	Any	00000000	00000000

Elbow

PPS Plastic Body with PPS 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	Mounting Orientation		Each
SPDT
A	1/4	NPT	Female	0.1	0.02	250 psi @ 70 ° F	0° to 225°	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	Any	00000000	0000000
A	1/4	NPT	Female	0.25	0.05	250 psi @ 70 ° F	0° to 225°	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	Any	00000000	000000
A	1/4	NPT	Female	1	0.2	250 psi @ 70 ° F	0° to 225°	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	Any	00000000	000000
A	1/4	NPT	Female	1.5	0.3	250 psi @ 70 ° F	0° to 225°	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	Any	00000000	000000

Flow Switches

Activate or deactivate equipment when your flow rate reaches a set point. These switches have an adjustment screw to select your specific flow rate within the set point range. 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. 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’re accurate in any mounting orientation.

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

Straight

						Conduit
Pipe Connections	Set Point Range, gpm	Max. Pressure	Temp. Range, °F	Voltage	Max. Switching Current	Trade Size	Thread Type	Gender	End-to-End Lg.		Each
Bronze Body
1 NPT Female	1 to 6	400 psi @ 70° F	-20° to 200°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	3 1/4"	0000000	0000000
1 NPT Female	2 to 8	400 psi @ 70° F	-20° to 200°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	3 1/4"	0000000	000000
1 NPT Female	5 to 15	400 psi @ 70° F	-20° to 200°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	3 1/4"	0000000	000000

Elbow

						Conduit
Pipe Connections	Set Point Range, gpm	Max. Pressure	Temp. Range, °F	Voltage	Max. Switching Current	Trade Size	Thread Type	Gender	Port-to-Port Lg.		Each
Bronze Body
3/4 NPT Female	0.75 to 4	400 psi @ 70° F	-20° to 180°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	1 3/8"	0000000	0000000
3/4 NPT Female	2 to 8	400 psi @ 70° F	-20° to 180°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	1 3/8"	0000000	000000
3/4 NPT Female	7 to 14	400 psi @ 70° F	-20° to 180°	120V AC/ 240V AC	200 mA @ 240 V AC 400 mA @ 120 V AC	1/2	NPT	Male	1 3/8"	0000000	000000

High-Pressure Flow Switches for Oil

Measure the flow rate of oil at pressures up to 3,600 psi to activate or deactivate equipment. Designed to compensate for viscosity and density changes, these switches have an adjustment screw to select your specific flow rate within the set point range. 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. 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). Their IP65 rating protects them from dust and low-pressure washdowns, such as from a garden hose. All are accurate in any mounting orientation.

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

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

SPDT
Pipe Connections	Set Point, gpm	Approximate Difference Between Setpoint and Reset Point	Max. Pressure	Max. Temp., °F	Max. Switching Current	Port-to-Port Lg.	Environmental Rating		Each
Brass Body with Brass Fittings
1/4 NPT Female	0.03 to 0.12	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	0000000
1/4 NPT Female	0.05 to 0.3	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
1/4 NPT Female	0.2 to 0.9	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
1/4 NPT Female	0.5 to 2.5	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
1/2 NPT Female	1.5 to 5	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
3/4 NPT Female	1 to 11	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
3/4 NPT Female	2 to 18	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	6 3/8"	IP65	0000000	000000
1 NPT Female	2 to 20	Adjustable	3600 psi @ 70° F	212°	1 A @ 100 V AC 0.42 A @ 240 V AC 1 A @ 60 V DC 0.26 A @ 230 V DC	7 5/16"	IP65	0000000	000000

High-Pressure Flow Switches

Rated for pressures up to 3,600 psi, these switches measure the flow rate of liquids to activate or deactivate equipment when your flow rate reaches a set point. Tighten or loosen the adjustment screw on these switches to choose your flow rate anywhere within set point the range. 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. 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 correctly. IP rated, they seal out dust and can be lightly rinsed.

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

SPDT
Pipe Connections	Set Point, gpm	Approximate Difference Between Setpoint and Reset Point	Body Material	Max. Pressure	Max. Temp., °F	Max. Switching Current	Port-to-Port Lg.	Environmental Rating		Each
Brass Body with 304 Stainless Steel Fittings
1/4 NPT Female	0.06 to 0.8	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 3/16"	IP65	0000000	0000000
1/4 NPT Female	0.25 to 2.6	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 3/16"	IP65	0000000	000000
1/4 NPT Female	0.3 to 6	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 3/16"	IP65	0000000	000000
1/2 NPT Female	1 to 8	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 3/16"	IP65	0000000	000000
1/2 NPT Female	2 to 10	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 7/8"	IP65	0000000	000000
3/4 NPT Female	8 to 34	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	1.5 A @ 240 V AC	5 7/8"	IP65	0000000	000000

High-Pressure Flow Switches for Gases

Good for compressed-air systems and other compressed gases that reach up to 3,600 psi, these switches measure the flow rate to activate or deactivate equipment when they reach a set point. Tighten or loosen the adjustment screw to choose your flow rate anywhere within the set point range. As flowing gas 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. 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 correctly. IP rated, they seal out dust and can be lightly rinsed.

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

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

SPDT
Pipe Connections	Set Point, scfm	Approximate Difference Between Setpoint and Reset Point	Body Material	Max. Pressure	Max. Temp., °F	Max. Switching Current	Port-to-Port Lg.	Environmental Rating		Each
Brass Body with 304 Stainless Steel Fittings
1/4 NPT Female	0.4 to 4	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 3/16"	IP65	0000000	0000000
1/4 NPT Female	2 to 10	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 3/16"	IP65	0000000	000000
1/4 NPT Female	3 to 24	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 3/16"	IP65	0000000	000000
1/2 NPT Female	4 to 30	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 3/16"	IP65	0000000	000000
3/4 NPT Female	10 to 90	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 7/8"	IP65	0000000	000000
3/4 NPT Female	30 to 130	Adjustable	Nickel Plated Brass	3600 psi @ 70° F	212°	0.8 A @ 240 V AC	5 7/8"	IP65	0000000	000000

Hazardous Location Insertion Flow Switches

Safely activate and deactivate equipment in environments with flammable gases and combustible dust when your flow rate reaches a set point. They are UL listed and CSA certified for use in hazardous locations. These switches save you from disassembling your pipeline because you insert them into pipe tees or pipe outlets instead of mounting them inline. They actuate when your system’s liquid pushes the paddle into a set position. To change your set point, the paddle has multiple layers that you can remove. For the lowest set point, use the largest paddle that will fit your pipe. To increase your set point, loosen the locking washers and remove paddles. You can trim the paddles to fine-tune your set point. The smaller the paddle, the higher the setpoint.

They should be mounted vertically into a horizontal pipeline, so liquid pushes the paddle.

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.

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

DPDT (double pole, double throw) switches can either turn two devices from off to on (normally open) or on to off (normally closed).

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

				Set Point Range		Max. Flow Rate					Conduit
Pipe Size	Thread Type	Gender	For Pipe Size	For Water and Oil, gpm	For Air and Inert Gas, scfm	For Water and Oil, gpm	For Air and Inert Gas	Max. Pressure	Temp. Range, °F	Max. Switching Current @ Voltage	Trade Size	Thread Type	Gender	Body Ht.		Each
SPDT
Brass Body
1 1/2	NPT	Male	1 1/2 2 4 12 20	3 to 7 4 to 15 12 to 95 140 to 900 400 to 2,400	17 to 32 13 to 65 50 to 400 800 to 3,450 2,850 to 10,000	55 97 391 3,525 9,792	Not Rated	1000 psi @ 70° F	-4° to 275°	5 A @ 125 V AC 5 A @ 250 V AC	3/4	NPT	Female	8"	00000000	0000000
316 Stainless Steel Body
1 1/2	NPT	Male	1 1/2 2 4 12 20	3 to 7 4 to 15 12 to 95 140 to 900 400 to 2,400	17 to 32 13 to 65 50 to 400 800 to 3,450 2,850 to 10,000	55 97 391 3,525 9,792	Not Rated	2000 psi @ 70° F	-4° to 275°	5 A @ 125 V AC 5 A @ 250 V AC	3/4	NPT	Female	8"	00000000	00000000
DPDT
Brass Body
1 1/2	NPT	Male	1 1/2 2 4 12 20	3 to 7 4 to 15 12 to 95 140 to 900 400 to 2,400	17 to 32 13 to 65 50 to 400 800 to 3,450 2,850 to 10,000	55 97 391 3,525 9,792	Not Rated	1000 psi @ 70° F	-4° to 275°	5 A @ 125 V AC 5 A @ 250 V AC	3/4	NPT	Female	8"	00000000	000000
316 Stainless Steel Body
1 1/2	NPT	Male	1 1/2 2 4 12 20	3 to 7 4 to 15 12 to 95 140 to 900 400 to 2,400	17 to 32 13 to 65 50 to 400 800 to 3,450 2,850 to 10,000	55 97 391 3,525 9,792	Not Rated	2000 psi @ 70° F	-4° to 275°	5 A @ 125 V AC 5 A @ 250 V AC	3/4	NPT	Female	8"	00000000	00000000

Air-Pressure-Actuated HVAC Switches

Often used to detect clogged air filters and iced air conditioner coils, these switches sense small changes in pressure between two points in your duct.

Diaphragm Sensor
Setpoint, in. of H2O	Accuracy, in. of H2O	Temperature Range, °F	Current	Electrical Connection Type	Switch Type	Max. Pressure, psi	Low Pressure Side Connection	High Pressure Side Inside Connection	High Pressure Side Outside Connection		Each
0.05-5	0.025	-40° to 165°	2.9 A @ 240 V AC 5.8 A @ 120 V AC	Hardwire	SPDT	1	1/8 NPT Female	1/8 NPT Female	1/2 NPSM	000000	0000000
0.05-5	0.04	-40° to 165°	4.9 A @ 240 V AC 9.8 A @ 120 V AC	Hardwire	SPDT	1	1/8 NPT Female	1/8 NPT Female	1/2 NPSM	000000	000000