Hazardous Location Flow Switches

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Approximate Difference Between Set Point and Reset Point

Hazardous Location Rating

NEC Class I Divisions 1, 2 Groups A, B, C, D

NEC Class I Divisions 1, 2 Groups B, C, D

NEC Class I Divisions 1, 2 Groups C, D

NEC Class II Divisions 1, 2 Groups E, F, G

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1 Off or 1 On

2 Off or 2 On

Number of Circuits Controlled

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EAR99

DFARS Specialty Metals

Gender

Flow Set Point

0.18 scfm to 2.7 scfm

800 scfm to 3,450 scfm

2,850 scfm to 10,000 scfm

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16 Products

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.

			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
1/2	NPT	Female	1.5	6.5	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 1/4"	00000000	0000000
3/4	NPT	Female	2	10	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 3/8"	00000000	000000
1	NPT	Female	3	14	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 1/2"	00000000	000000
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	000000
1 1/2	NPT	Female	6	33	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 7/8"	00000000	000000
2	NPT	Female	10	43	250 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3"	00000000	000000
304 Stainless Steel Body
1/2	NPT	Female	1.5	6.5	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 1/4"	00000000	000000
3/4	NPT	Female	2	10	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	2 5/8"	00000000	000000
1	NPT	Female	3	14	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3"	00000000	000000
2	NPT	Female	10	43	2000 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	4 3/4"	00000000	00000000

Hazardous Location Flow Switches

UL listed for use where flammable gases or combustible dusts may be present, these flow switches activate or deactivate equipment when your flow rate reaches a set point. Use the adjustment screw to select their set point. They actuate when your flowing liquid or gas pushes their paddle into a certain position determined by the set point. 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). Mount them horizontally. Rated NEMA 4, they also protect against weather and washdowns.

These flow switches are calibrated with water and air. You can use them with other liquids and gases, but they may not measure accurately if the viscosity is different from water or air.

			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
1/2	NPT	Female	0.04 to 0.75	0.18 to 2.7	1450 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3 5/8"	00000000	0000000
304 Stainless Steel Body
1/2	NPT	Female	0.04 to 0.75	0.18 to 2.7	1450 psi @ 70° F	-4° to 220°	120V AC/ 240V AC	5 A @ 120 V AC	3/4	NPT	Male	3 5/8"	00000000	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).

				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