Pressure Differential Switches

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	For Use With For Use With

Air

Hydraulic Fluid

Water

	Maximum Setpoint Maximum Setpoint

	Scale Scale

psi

in. of H2O

	Maximum Pressure Maximum Pressure

	Switching Voltage Switching Voltage

120V AC

240V AC

480V AC

	Minimum Setpoint Minimum Setpoint

	Housing Material Housing Material

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

1 On (Normally Closed)

	Maximum Process Temperature Maximum Process Temperature

175° F

180° F

200° F

	Pipe Size Pipe Size

1/8

1/4

	Environment Environment

Corrosive

Damp

Dusty

Outdoor

Washdown

Hazardous

	Specifications Met Specifications Met

CE Marked

CSA

	For Conduit Trade Size For Conduit Trade Size

1/2

7/8

	Gasket Material Gasket Material

Buna-N Rubber

Silicone Rubber

	Height Height

3 1/2"

	Width Width

2 3/8"

3 1/2"

	Minimum Environment Temperature Minimum Environment Temperature

-40° F

-30° F

30° F

	Minimum Process Temperature Minimum Process Temperature

-40° F

-30° F

0° F

	Switching Current Switching Current

0.25A

15A

	Maximum Environment Temperature Maximum Environment Temperature

160° F

175° F

180° F

	Connection Material Connection Material

Brass

Aluminum

	Environmental Rating Environmental Rating

NEMA 4

IP65

NEC Class I Division 2
Groups A, B, C, D

NEC Class II Division 2
Groups F, G

	Sensing Type Sensing Type

Diaphragm

Paddle

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16 Products

About Pressure Switches

For Use With: Air, Hydraulic Fluid (Petroleum Based), Water
Connection Material: Brass
Connection: NPT Female
Switching Current: 5A
Switching Voltage: 120V AC/240V AC

These switches operate based on the difference in pressure between two process lines. When the differential pressure exceeds your setpoint, the switch is activated. Often used to indicate clogged filters, they are designed to automate controls or activate an alarm in your process. Switches are single pole, double throw (SPDT), so they switch one circuit on or off. They can be wired normally open (NO) or normally closed (NC). They are rated NEMA 4 to withstand washdowns, dust, and outdoor environments.

					Temperature Range, °F		Conduit
Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Pressure, psi	Accuracy	Pipe Size	Environment	Process	For Trade Size	Connection Gender	Environmental Rating	Specifications Met		Each
300 Series Stainless Steel and Polyester Plastic Housing
1-10	0.75	150	±1%	1/4	30° to 160°	0° to 200°	7/8	Female	NEMA 4	UL Listed, C-UL Listed, CE Marked	00000000	0000000
4-45	1	150	±1%	1/4	30° to 160°	0° to 200°	7/8	Female	NEMA 4	UL Listed, C-UL Listed, CE Marked	00000000	000000

Washdown Differential Pressure
Switches with Dial Indicator

For Use With: Air, Hydraulic Fluid, Water
Connection Material: Brass
Connection: NPT Female
Switching Current: 0.25A
Switching Voltage: 120V AC

Not only are these switches rated NEMA 4X for protection from dirt, washdowns, and corrosion, they also have an indicator for additional monitoring at the source of your application. Switches operate based on the difference in pressure between two process lines. When the differential pressure exceeds your setpoint, the switch is activated. Use them to automate controls or activate an alarm in your process. Switches are single pole, double throw (SPDT), so they switch one circuit on or off. They can be wired normally open (NO) or normally closed (NC).

					Temperature Range, °F		Conduit		Lens
Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Pressure, psi	Accuracy	Pipe Size	Environment	Process	For Trade Size	Connection	Dia.	Material	Specifications Met		Each
Brass Housing
3-15	3	5,000	±2%	1/4	-40° to 175°	-40° to 175°	1/2	NPT Female	3"	Glass	CSA Certified	00000000	0000000
6-30	6	5,000	±2%	1/4	-40° to 175°	-40° to 175°	1/2	NPT Female	3"	Glass	CSA Certified	00000000	000000
10-50	10	5,000	±2%	1/4	-40° to 175°	-40° to 175°	1/2	NPT Female	3"	Glass	CSA Certified	00000000	000000

Low Differential Pressure Switches

For Use With: Air
Connection Material: Aluminum
Connection: NPT Female
Switching Current: 15A
Switching Voltage: 120V AC/240V AC/480V AC

Often used with ovens, dryers, and HVAC systems, these switches detect small differences in pressure. When the differential pressure exceeds your setpoint, the switch is activated. Use them to automate controls or activate an alarm in your process. Switches are single pole, double throw (SPDT), so they switch one circuit on or off. They can be wired normally open (NO) or normally closed (NC).

					Temperature Range, °F		Conduit
Setpoint, in. of H2O	Approximate Difference Between Setpoint and Reset Point, in. of H2O	Max. Pressure, in. of H2O	Accuracy	Pipe Size	Environment	Process	For Trade Size	Connection Gender	Specifications Met		Each
Zinc-Plated Steel Housing
0.07-0.15	0.04	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	000000
0.15-0.55	0.1	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	00000
0.4-1.6	0.16	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	00000
1.4-5 1/2	0.3	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	00000
3-11 3/4	0.4	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	00000
4-20	0.5	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	00000

Washdown Differential Pressure Switches

For Use With: Air, Hydraulic Fluid (Petroleum Based), Water
Connection Material: Brass
Connection: NPT Female
Switching Current: 5A
Switching Voltage: 120V AC/240V AC

These switches are rated NEMA 4 for protection from dirt and washdowns. They operate based on the difference in pressure between two process lines. When the differential pressure exceeds your setpoint, the switch is activated. Often used to indicate clogged filters, they are designed to automate controls or activate an alarm in your process. Switches are single pole, double throw (SPDT), so they switch one circuit on or off. They can be wired normally open (NO) or normally closed (NC).

					Temperature Range, °F		Conduit
Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Pressure, psi	Accuracy	Pipe Size	Environment	Process	For Trade Size	Connection	Specifications Met		Each
300 Series Stainless Steel and Polyester Plastic Housing
1-10	0.75	150	±1%	1/4	30° to 160°	0° to 200°	7/8	NPT Female	C-UL Listed, CE Marked, UL Listed	00000000	0000000
4-45	1	150	±1%	1/4	30° to 160°	0° to 200°	7/8	NPT Female	C-UL Listed, CE Marked, UL Listed	00000000	000000

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

Airflow-Actuated HVAC Switches

Use this switch to sense changes in airflow velocity in duct. The paddle extends into the duct and actuates the switch when airflow reaches the setpoint. Switch is rated NEMA 3R for protection from dirt, falling liquids, and light splashing.

							Paddle
Setpoint, fpm	Temperature Range, °F	Current	Electrical Connection Type	Switch Type	For Conduit Trade Size	Knockout Dia.	Material	Ht.	Wd.	For Use Outdoors	Environmental Rating	Specifications Met		Each
Paddle Sensor
350-500	32° to 104°	10 A @ 240 V AC 16 A @ 120 V AC	Screw Terminal	SPDT	1/2	7/8"	Stainless Steel	6 7/8"	3 1/8"	Yes	IP43, NEMA 3R	UL Listed, C-UL Listed, CE Marked	0000000	0000000

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