Water Level Controls | McMaster-Carr

Filter by

Product Family

Float Switches

Level Sensor Switches

Liquid-Level Transmitters

For Use With

System of Measurement

Input Voltage

Electrical Connection

M12

Quick-Disconnect Terminal

Mounting Position

Pipe Size

Body Material

Mounting Location

Insertion Depth

Float Material

Maximum Temperature

Switch Designation

Environment

High-Pressure Washdown

Switch Starting Position

Material

Current @ Voltage

Voltage

Connects To

Thread Type

Maximum Pressure @ Temperature

Cable Length

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

2B230

EAR99

DFARS Specialty Metals

Exempt

RoHS

Compliant

Compliant with Exemptions

Not Compliant

Forward

How can we improve?

103 Products

About Float Switches

Understand how float switches trigger circuits and when a relay is required.

Dual-Level Vertical-Mount Float Switches for Water

Empty and fill your tank with a single device—these dual-level switches include two float switches that actuate at different levels. The stem can be cut to length. Mount through a threaded connection at the top of your tank.

													Overall
	Pipe Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Float Ht.	Ht.	Dia.	Electrical Connection	Includes		Each
120V AC/240V AC Input Voltage







				Polypropylene Float

				2	NPT	Male	0.85	100 psi @ 70° F	35 to 220	36"	1 Off/1 On	SPST-NO SPST-NC	0.5 amp @ 120V AC	Top	2"	38 5/8"	1 1/2"	Wire Leads	Two Switches, Fittings	5267K44	0000000

Horizontal-Mount Float Switches for Water


Polysulfone Body	PPS	303 Stainless Steel Body

Brass Body	304 Stainless Steel Body	316 Stainless Steel Body

Install these switches into a threaded connection in your tank wall from outside the tank. They activate process equipment such as pumps or motors when the water level in your tank reaches the float. Some meet European safety standards.

Choose switches with a brass or stainless steel body for durability in harsh conditions.

	Pipe												Conduit
	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Float Material	Electrical Connection	Trade Size	Pipe Size	Thread Type	Gender		Each
120V AC Input Voltage







				303 Stainless Steel Body

				1	NPT	Male	0.7	350 psi @ 70° F	40 to 200	1 3/4"	1 Off/1 On	SPST-NO SPST-NC	0.5 amp @ 120V AC	304 Stainless Steel	Wire Leads	—	1/8	NPT	Male	48255K31	0000000




						Brass Body

						1	NPT	Male	0.9	1,000 psi @ 70° F	40 to 200	1 3/4"	1 Off/1 On	SPST-NO SPST-NC	0.5 amp @ 120V AC	Polypropylene	Wire Leads	—	1/8	NPT	Male	48255K26	000000


						120V AC/240V AC Input Voltage







										Polysulfone Body

										1/2	NPT	Male	0.71	150 psi @ 70° F	-40 to 225	2 11/16"	1 Off/1 On	SPST-NO SPST-NC	0.16 amp @ 120V AC	Polysulfone	Wire Leads	—	—	—	—	49175K37	00000




												PPS Body

												1	NPT	Male	0.6	150 psi @ 70° F	40 to 210	4 3/4"	1 Off or 1 On	SPDT	5 amp @ 120V AC	PPS	Wire Leads	1/2	—	NPT	Male	46235K25	000000




														304 Stainless Steel Body—CE Marked

														1/2	NPT	Male	0.85	360 psi @ 70° F	0 to 250	3 1/4"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	304 Stainless Steel	Wire Leads	1/2	—	NPT	Male	48255K111	00000




																316 Stainless Steel Body

																1	NPT	Male	0.75	1,000 psi @ 70° F	-30 to 300	5"	1 Off or 1 On	SPDT	0.16 amp @ 120V AC	316 Stainless Steel	Wire Leads	1/2	—	NPT	Male	48255K112	000000

Dual Float Switches for Sump Pumps

If the primary float fails, the backup float kicks in and an alarm sounds to indicate float malfunction. The floats are enclosed in a mounting cage to minimize false switch activation. Use these switches to replace an existing switch, or pair them with a plug-in activated pump that operates on 15 amps or less to control when the pump activates.

			Electrical
Voltage, V AC	Current, amp	Max. Temp., ° F	Connection	No. of Blades	Cord Lg., ft.	Features	Includes		Each
120	12	100	Straight Blade	3	4	Mounting Cage	Stainless Steel Clamp	2506K15	0000000

Through-Wall Vertical-Mount Float Switches for Water

Mount these switches through the top or bottom of your tank and secure them with a nut from the inside. With the wiring outside your tank, electrical connections stay dry and maintenance is easier. These switches activate process equipment, such as pumps or motors, when the water level in your tank reaches the float. The polypropylene float withstands corrosion, so you can use these switches in water-storage and treatment systems.

	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Float Ht.	Overall Dia.	Electrical Connection	Includes		Each
120V AC/240V AC Input Voltage







	Polypropylene Float

	3/8"	0.9	150 psi @ 70° F	35 to 150	1 9/16"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Through Wall, Top, Bottom	1"	1"	Wire Leads	Mounting Nut	50195K76	000000

Vertical-Mount Float Switches for Water


Buna-N Float	Polypropylene Float	CPVC Float	316 Stainless Steel Float

Mount these switches from outside the tank through a threaded connection at the top or bottom of your tank. They activate process equipment such as pumps or motors when the water level in your tank reaches the float. Choose switches with a stainless steel float for durability in harsh conditions.

	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Float Ht.	Overall Dia.	Electrical Connection		Each
120V AC/240V AC Input Voltage







	Buna-N Float

	1/8	NPT	Male	0.45	50 psi @ 70° F	35 to 150	1 7/8"	1 On	SPST-NC	0.17 amp @ 120V AC	Top, Bottom	1 1/16"	1 7/8"	Wire Leads	48095K41	000000




			Polypropylene Float

			1/8	NPT	Male	0.6	50 psi @ 70° F	35 to 225	1 9/16"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Top, Bottom	1"	1"	Wire Leads	50195K11	00000


			1/8	NPT	Male	0.9	150 psi @ 70° F	35 to 150	1 9/16"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Top, Bottom	1"	1"	Wire Leads	50195K75	00000
			1/8	NPT	Male	0.9	150 psi @ 70° F	35 to 150	1 7/8"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Top, Bottom	1"	3/4"	Wire Leads	50195K65	00000




					CPVC Float

					1/4	NPT	Male	0.85	15 psi @ 70° F	35 to 180	2 15/16"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Top, Bottom	1 13/16"	1 1/2"	Wire Leads	5127K21	000000




							316 Stainless Steel Float

							1/2	NPT	Male	0.35	300 psi @ 70° F	35 to 300	4 13/16"	1 Off/1 On	SPST-NO SPST-NC	0.83 amp @ 120V AC	Top, Bottom	3 1/2"	3 1/2"	Wire Leads	4646K37	000000

Through-Wall Horizontal-Mount Float Switches for Water


Polysulfone Body and Float	Brass Body and Buna-N Float

Mount these switches through an unthreaded hole in your tank wall and secure with a nut from outside the tank. They activate process equipment such as pumps or motors when the water level in your tank reaches the float.

Brass Body—Choose switches with a brass body for durability in harsh conditions.

	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Electrical Connection	Includes		Each
120V AC/240V AC Input Voltage







	Polysulfone Body and Float

	1/2"	0.71	150 psi @ 70° F	-40 to 225	2 11/16"	1 Off/1 On	SPST-NO SPST-NC	0.16 amp @ 120V AC	Through Wall	Wire Leads	Mounting Nut	49175K38	000000


	5/8"	0.71	150 psi @ 70° F	-40 to 225	2 11/16"	1 Off/1 On	SPST-NO SPST-NC	0.16 amp @ 120V AC	Through Wall	Wire Leads	Mounting Nut	49175K39	00000




			Brass Body and Buna-N Float

			13/32"	0.55	150 psi @ 70° F	-40 to 180	1 3/4"	1 Off/1 On	SPST-NO SPST-NC	0.16 amp @ 120V AC	Through Wall	Wire Leads	Mounting Nut	49175K41	000000

Drop-In Float Switches for Water


ABS Float with Three-Prong Socket	Polypropylene Float with Adjustable Level

Hang these free-floating switches in your tank for water-level monitoring that doesn’t require installation through a tank wall.

Three-Prong Socket—Switches with three-prong socket allow you to plug your pump directly into the switch; the socket piggybacks to the three-prong plug. They’re often used to trigger an alarm.

Adjustable Level—Switches with adjustable level prevent excessive switch activation in tanks with fluctuating level. Adjust the set point by moving the weight along the cable or altering the cable length.

									Float			Electrical
	Cable Lg., ft.	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Switch Starting Position	Switch Designation	Current @ Voltage	Dp. Set Point	Dia.	Ht.	Electrical Connection Type	Connection	No. of Blades	Certification		Each
120V AC Input Voltage







				ABS Float with Three-Prong Socket

				9 1/2	1	20 psi @ 70° F	35 to 140	1 Off	SPST-NO	15 amp @ 120V AC	10"	2 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K811	000000


				9 1/2	1	20 psi @ 70° F	35 to 140	1 Off	SPST-NO	15 amp @ 120V AC	10"	3 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K911	00000
				9 1/2	1	20 psi @ 70° F	35 to 140	1 On	SPST-NC	15 amp @ 120V AC	10"	2 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K813	00000
				9 1/2	1	20 psi @ 70° F	35 to 140	1 On	SPST-NC	15 amp @ 120V AC	10"	3 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K912	00000
				19 1/2	1	20 psi @ 70° F	35 to 140	1 Off	SPST-NO	15 amp @ 120V AC	10"	2 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K821	00000
				19 1/2	1	20 psi @ 70° F	35 to 140	1 Off	SPST-NO	15 amp @ 120V AC	10"	3 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K921	00000
				19 1/2	1	20 psi @ 70° F	35 to 140	1 On	SPST-NC	15 amp @ 120V AC	10"	2 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K823	00000
				19 1/2	1	20 psi @ 70° F	35 to 140	1 On	SPST-NC	15 amp @ 120V AC	10"	3 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K922	00000
				29 1/2	1	20 psi @ 70° F	35 to 140	1 Off	SPST-NO	15 amp @ 120V AC	10"	2 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K831	00000
				29 1/2	1	20 psi @ 70° F	35 to 140	1 Off	SPST-NO	15 amp @ 120V AC	10"	3 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K931	00000
				29 1/2	1	20 psi @ 70° F	35 to 140	1 On	SPST-NC	15 amp @ 120V AC	10"	2 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K832	00000


				29 1/2	1	20 psi @ 70° F	35 to 140	1 On	SPST-NC	15 amp @ 120V AC	10"	3 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K932	00000
				49 1/2	1	20 psi @ 70° F	35 to 140	1 Off	SPST-NO	15 amp @ 120V AC	10"	2 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K841	000000
				49 1/2	1	20 psi @ 70° F	35 to 140	1 Off	SPST-NO	15 amp @ 120V AC	10"	3 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K941	000000
				49 1/2	1	20 psi @ 70° F	35 to 140	1 On	SPST-NC	15 amp @ 120V AC	10"	2 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K842	000000
				49 1/2	1	20 psi @ 70° F	35 to 140	1 On	SPST-NC	15 amp @ 120V AC	10"	3 1/2"	3 1/4"	Plug In	Straight Blade	3	UL Listed	51445K942	000000


				250V AC/250V DC Input Voltage







								Polypropylene Float with Adjustable Level

								19 3/4	0.6	29 psi @ 70° F	32 to 140	1 On	SPST-NC	10 amp @ 250V AC	11" to 39"	2 3/4"	4 1/4"	—	Wire Leads	—	—	49045K12	000000


								300V AC/300V DC Input Voltage







												Polypropylene Float with Adjustable Level

												19 3/4	0.7	29 psi @ 70° F	14 to 122	1 Off	SPST-NO	0.5 amp @ 300V AC, 0.5 amp @ 300V DC	11" to 39"	2 3/4"	4 1/4"	—	Wire Leads	—	—	49045K11	000000

External-Mount Float Switches for Oils

For visual monitoring and easy access, these switches are housed in a clear acrylic reservoir that mounts to the outside of your tank. Mount them vertically.

										Overall
	Pipe Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Switch Starting Position	Switch Designation	Current @ Voltage	Ht.	Dia.	Ctr.-to-Ctr. Ht.	Electrical Connection		Each
120V AC/240V AC Input Voltage







				Acrylic Plastic Body and 316 Stainless Steel Float

				1/2	NPT	Female	0.65	125 psi @ 70° F	35 to 170	1 Off	SPST-NO	0.4 amp @ 120V AC	6 3/8"	3 5/16"	4 3/8"	Wire Leads	4288K51	0000000


				1/2	NPT	Female	0.65	125 psi @ 70° F	35 to 170	1 On	SPST-NC	0.4 amp @ 120V AC	6 3/8"	3 5/16"	4 3/8"	Wire Leads	4288K52	000000

Sanitary Level Sensor Switches

Detect when oil rises on water, foam forms on beer, and tanks empty, triggering pumps and valves in food and sanitary lines. These switches are 3-A and European Hygienic Engineering and Design Group (EHEDG) certified since they’re easy to keep clean. Highly polished, they prevent bacteria from growing. They also stand up to hot spraying water, chemicals, and cleaners common to food plants, thanks to their PEEK probe, stainless steel body, BSPP threads, and IP ratings. Their IP67 rating also means they won’t fail if under water temporarily.

To connect to automated systems and remote displays, these switches work with IO Link and 4-20 mA analog output, making them good for hard-to-reach areas. Program the colors on the LED indicator to tell you what the switch is sensing.

USP Class tested, the plastic in these switches won’t leach chemicals. They’re also C-UL listed and CE marked to meet Canadian and European safety standards.

Note: Solids and liquids must have a dielectric constant of at least 1.5 to detect them.

													Electrical
	Pipe Size	Thread Type	Gender	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Output Current, mA	Output Digital Signal	Probe Material	Overall Lg.	Connection	No. of Poles	Certification	Enclosure Rating		Each
8V DC to 36V DC Input Voltage







				316 Stainless Steel Body

				1/2	BSPP	Male	145 psi @ 70° F	-40 to 230	9/16"	1 Off or 1 On	SPDT	100	PNP, NPN	PEEK	3 13/16"	M12	4	C-UL Listed, CE Marked, EHEDG Certified	IP67, IP69K	3910N11	0000000

Quick-Clamp Adapters

Image of Product. Front orientation. Tube Fittings.

Use quick-clamp adapters to connect these switches to quick-clamp sanitary tube fittings.

Tube Connection		Pipe Connection
For Tube OD	Flange OD	Pipe Size	Thread Type	Gender	Material	Max. Pressure @ Temp.	Food Industry Std.	Certification		Each
1 1/8"	1.988"	1/2	BSPP	Female	316 Stainless Steel	550 psi @ 70° F	3-A Certified 74-07	CE Marked, EHEDG Certified	3910N12	0000000

Dual-Level Vertical-Mount Float Switches for Fuels and Oils

													Overall
	Pipe Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Float Ht.	Ht.	Dia.	Electrical Connection		Each
120V AC/240V AC Input Voltage







				Buna-N Float

				2	NPT	Male	0.55	150 psi @ 70° F	35 to 180	33 1/2"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Top	1 11/16"	35"	1 7/8"	Wire Leads	5267K84	0000000




						316 Stainless Steel Float

						2	NPT	Male	0.75	750 psi @ 70° F	35 to 275	34"	1 Off/1 On	SPST-NO SPST-NC	0.17 amp @ 120V AC	Top	2"	35 1/2"	2 1/16"	Wire Leads	5267K88	00000000

Float Switches for Sump Pumps

Hang these switches in a sump pit to detect rising water levels. Use them to replace an existing switch, or pair them with a plug-in activated pump to control when the pump activates.

			Electrical
Voltage, V AC	Current, amp	Max. Temp., ° F	Connection	No. of Blades	Cord Lg., ft.	Includes		Each
120	13	140	Straight Blade	3	15	Stainless Steel Clamp	5142K68	000000
240	13	140	Straight Blade	3	15	Stainless Steel Clamp	5142K72	000000

Horizontal-Mount Hazardous Location Float Switches for Fuels and Oils


Style A	Style B

Style C

Designed for use in areas where flammable substances are present, these switches are CSA certified for hazardous locations. Mount them through a tank wall. All are rated NEMA 4 for protection from washdowns. All are single pole, double throw (SPDT) and can be installed to turn one circuit from “off” to “on” or from “on” to “off”.

Switches with a stainless steel body are more corrosion resistant than switches with a brass body.

		Pipe									Conduit
	Style	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Current @ Voltage	Float Material	Trade Size	Thread Type	Gender	Hazardous Location Rating	Enclosure Rating		Each
120V AC/240V AC Input Voltage







				Brass Body

				A	1	NPT	Male	0.7	350 psi @ 70° F	0 to 220	1 3/4"	5 amp @ 120V AC	304 Stainless Steel	3/4	NPT	Male	NEC Class I Divisions 1, 2 Groups B, C, D NEC Class II Divisions 1, 2 Groups E, F, G	NEMA 4	4909K12	0000000


				A	1	NPT	Male	0.9	1,000 psi @ 70° F	0 to 220	1 3/4"	5 amp @ 120V AC	Polypropylene	3/4	NPT	Male	NEC Class I Divisions 1, 2 Groups B, C, D NEC Class II Divisions 1, 2 Groups E, F, G	NEMA 4	4909K63	000000
				B	1	NPT	Male	0.5	200 psi @ 70° F	0 to 220	2 7/8"	5 amp @ 120V AC	304 Stainless Steel	3/4	NPT	Male	NEC Class I Divisions 1, 2 Groups B, C, D NEC Class II Divisions 1, 2 Groups E, F, G	NEMA 4	4909K11	000000
				C	1 1/2	NPT	Male	0.7	100 psi @ 70° F	0 to 275	13 3/16"	10 amp @ 120V AC	316 Stainless Steel	3/4	NPT	Female	NEC Class I Divisions 1, 2 Groups C, D NEC Class II Divisions 1, 2 Groups E, F, G	IP56 NEMA 4	4914K86	000000




						303 Stainless Steel Body

						A	1	NPT	Male	0.9	2,000 psi @ 70° F	0 to 220	1 3/4"	5 amp @ 120V AC	Polypropylene	3/4	NPT	Male	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G	NEMA 4	4909K65	000000


						B	1	NPT	Male	0.5	200 psi @ 70° F	0 to 220	2 7/8"	5 amp @ 120V AC	304 Stainless Steel	3/4	NPT	Male	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G	NEMA 4	4909K13	000000




								316 Stainless Steel Body

								C	1 1/2	NPT	Male	0.7	100 psi @ 70° F	0 to 275	13 3/16"	10 amp @ 120V AC	316 Stainless Steel	3/4	NPT	Female	NEC Class I Divisions 1, 2 Groups C, D NEC Class II Divisions 1, 2 Groups E, F, G	IP56 NEMA 4	4914K87	00000000

Vertical-Mount Compressed-Air Float Switches for Fuels and Oils

Mount these switches through the top of your tank. They actuate with a compressed air valve instead of an electrical signal. The air valve opens when diesel fuel, hydraulic fluid, oil, or water moves the float.

Pipe											Air
Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Mounting Location	Air Inlet Pressure, psi	Overall Lg.	No. of Ports	For Tube ID	Gender		Each







			303 Stainless Steel Body and 304 Stainless Steel Float

			1	NPT	Male	0.5	200 psi @ 70° F	35 to 140	3 1/2"	Top	30 to 100	7 5/8"	3	3/32"	Male	3792K42	0000000

Vertical-Mount Hazardous Location Float Switches for Fuels and Oils

For use in locations with flammable gases and combustible dust, these switches are UL listed and CSA certified for Class I, Divisions 1 and 2, Groups C and D; and Class II, Divisions 1 and 2, Groups E, F, and G. Mount them vertically through the top of your tank. They're rated NEMA 4 for protection from washdowns.

	Pipe											Float			Conduit
	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Lg.	Dia.	Electrical Connection	Trade Size	Thread Type	Gender	Certification		Each
120V AC/240V AC Input Voltage







				316 Stainless Steel Body and Float

				1 1/2	NPT	Male	0.7	100 psi @ 70° F	35 to 275	9 1/4"	1 Off or 1 On	SPDT	10 amp @ 120V AC	Top	4 1/2"	1 5/8"	Wire Leads	3/4	NPT	Female	UL Listed, CSA Certified, FM Approved	4914K97	000000000

Float Liquid-Level Transmitters

Easy to set up and use, these transmitters measure liquid levels using a standard float gauge. They continuously send measurements to a receiving device, such as a programmable logic controller, so you can monitor status and manage components in your system.

		Pipe				Overall
	For Tank Dp.	Size	Type	Gender	Max. Pressure @ Temp.	Dia.	Lg.	Temp. Range, ° F	Cable Lg., ft.	Input Voltage, V DC	For Container Type	Electrical Connection	Certification		Each
4 mA to 20 mA Output Signal







				Polypropylene Float

				19"	1 1/2	NPT	Male	100 psi @ 70° F	1 7/8"	21"	-40 to 220	2	12 to 30	Closed Tank, Open Tank	Wire Leads	C-UL Recognized Component, CE Marked, UL Recognized Component	3966N11	0000000




						316 Stainless Steel Float

						24"	2	NPT	Male	200 psi @ 70° F	2 3/8"	27"	-40 to 220	2	12 to 30	Closed Tank, Open Tank	Wire Leads	C-UL Recognized Component, CE Marked, UL Recognized Component	3966N12	000000

Noncontact Level Sensor Switches for Water

Detect water level with infrared light to avoid false switch activation caused by vibration in your tank. Also known as optical switches, these sense the level by reflecting light into a receiver that sends an output current to activate an alarm or control circuit. They are sensitive to light and should be shielded or used in enclosed tanks. Mount them horizontally or vertically.

SPST-NC—SPST-NC switches activate when the tip is exposed to air and light reflects into the receiver.

SPST-NO—SPST-NO switches activate when the tip is submerged in liquid and light stops reflecting into the receiver.

	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Output Current, mA	Overall Lg.	Hex Size	Electrical Connection		Each
10V DC to 28V DC Input Voltage







	Polysulfone Body

	1/4	NPT	Male	150 psi @ 70° F	0 to 175	1/4"	1 Off	SPST-NO	40	2 3/16"	5/8"	Wire Leads	46455K48	0000000


	1/4	NPT	Male	150 psi @ 70° F	0 to 175	1/4"	1 On	SPST-NC	40	2 3/16"	5/8"	Wire Leads	46455K38	000000

Noncontact Liquid-Level Transmitters

Use these transmitters to measure the levels of corrosive, dirty, or sticky liquids without coming into contact with them. They’ll continuously send measurements, so you can monitor status and manage components in your system. Mount at the top of your tank. There should be no tank walls, agitators, or other objects in the path of the transmitter.

Ultrasonic


Transmitter	Button Interface

Ultrasonic transmitters use high-frequency sound waves and are often used to measure water, wastewater, chemicals, and oil but won’t work on vapors, foam, and other media that’s difficult to measure. The included fob allows you to connect your transmitter to your computer, where you'll download software that guides you through the setup process to make sure you get accurate readings.

Digital Switch Output—Transmitters with a switch can also signal your controller to turn components on or off when they reach a set level.

NEMA 6P Enclosure Rating—NEMA 6P rated transmitters protect against dust, weather, washdowns, corrosion, and submersion. IP68 rated transmitters seal out dust and water from temporary submersion.

Button Interface—Ultrasonic transmitters with a button interface can be set up and calibrated without the fob.

				Overall
	Pipe Size	For Liquid Level	Max. Pressure @ Temp.	Dia.	Lg.	Temp. Range, ° F	Cable Lg., ft.	Input Voltage, V DC	Electrical Connection	Enclosure Rating	Includes	Features		Each
NPT Male Pipe Connection







				0-5V DC, 0-10V DC Signal

				1	0 ft. to 4 ft.	30 psi @ 70° F	2"	3 1/4"	-30 to 140	4	12 to 24	Wire Leads	NEMA 6P	USB Configuration Fob	—	3407K23	0000000




						4-20 mA Signal

						2	0 ft. to 19 1/2 ft.	30 psi @ 70° F	4 3/8"	7"	-30 to 140	—	14 to 28	Quick-Disconnect Terminal	IP68, NEMA 6P	USB Configuration Fob	Button Interface	3407K17	000000


						3	0 ft. to 39 ft.	30 psi @ 70° F	4 5/8"	7"	-30 to 140	—	14 to 28	Quick-Disconnect Terminal	IP68, NEMA 6P	USB Configuration Fob	Button Interface	3407K18	00000000




								4-20 mA Signal with Switch

								1	0 ft. to 4 ft.	30 psi @ 70° F	2"	3 1/4"	-30 to 140	4	24	Wire Leads	NEMA 6P	USB Configuration Fob	—	3407K11	000000


								1	0 ft. to 9 3/4 ft.	30 psi @ 70° F	3"	4 3/4"	-30 to 140	4	24	Wire Leads	NEMA 6P	USB Configuration Fob	—	3407K14	000000
								2	1 1/2" to 4 3/4 ft.	30 psi @ 70° F	2 3/4"	4"	-30 to 140	4	14 to 28	Wire Leads	IP68, NEMA 6P	USB Configuration Fob	—	3407K15	000000
								2	4" to 9 3/4 ft.	30 psi @ 70° F	2 3/4"	4"	-30 to 140	4	14 to 28	Wire Leads	IP68, NEMA 6P	USB Configuration Fob	—	3407K16	000000

Replacement USB Adapters for Ultrasonic Transmitters

Electrical Connection	Component		Each
USB-A	USB Adapter	3407K19	000000

Submersible Liquid-Level Transmitters

For Liquids

Best for measuring liquid levels in applications where traditional mounting is difficult, these transmitters sit at the bottom of your tank. They sense liquid levels by measuring the pressure from the weight of the liquid above them. These transmitters continuously send measurements, so you can monitor the status and manage components in your system. Also known as level loggers, level sensors, and pressure transducers.

				Overall
	For Pressure	Accuracy	Max. Pressure @ Temp.	Dia.	Lg.	Temp. Range, ° F	Cable Lg., ft.	Input Voltage, V DC	For Container Type	Electrical Connection	Enclosure Rating		Each
4 mA to 20 mA Output Signal







				For Liquids

				0 to 5 psi / 0 to 11.5 ft. H₂O	±0.5%	7 psi @ 70° F	1"	5 5/8"	32 to 140	40	12 to 36	Closed Tank, Open Tank	Wire Leads	IP68	3962N11	0000000


				0 to 10 psi / 0 to 23 ft. H₂O	±0.5%	15 psi @ 70° F	1"	5 5/8"	32 to 140	40	12 to 36	Closed Tank, Open Tank	Wire Leads	IP68	3962N12	000000
				0 to 15 psi / 0 to 34 ft. H₂O	±0.5%	22 psi @ 70° F	1"	5 5/8"	32 to 140	60	12 to 36	Closed Tank, Open Tank	Wire Leads	IP68	3962N13	000000
				0 to 20 psi / 0 to 46 ft. H₂O	±0.5%	30 psi @ 70° F	1"	5 5/8"	32 to 140	60	12 to 36	Closed Tank, Open Tank	Wire Leads	IP68	3962N14	000000

Ultrasonic Switches

Detect objects and liquid or material levels to set off actions in your system—regardless of size, shape, or surface finish. These switches send out high-frequency sound waves that target small areas, so the surface and structure of your object won't affect results like photoelectric sensors, which sense using light. This makes them great for materials with uneven surfaces, such as granules and powder. They also sense objects when obscured by smoke, dust, debris, or water, but they don't work as well where there's wind, since it could disrupt their sound waves. Once an object is detected or a set level is reached, the digital output sends a signal to your controller to turn components in your system on or off. Use their plug to quickly connect and disconnect to cables with a socket (sold separately). UL listed, C-UL listed, and CE marked, all meet American, Canadian, and European safety standards.

Rated IP67, all of these switches seal out dust and water if briefly submersed.

Straight


	4-Pole M12 Plug

2 Outputs—Switches with two outputs let you set a minimum level on one output and a maximum on the other—for example, you can keep liquid levels constant by turning on a pump when the level drops too low and turning off the pump when it reaches the maximum.

IO-Link Communication Protocol—Switches with IO Link connect to a programmable logic controller (PLC), so you can change settings and receive error messages remotely. You need an IO-Link controller (not included) to connect.

	Sensors												Cables with Socket
	No. of Outputs	Output Digital Signal	Sensing Distance	Input Voltage, V DC	Control Communication Protocol	Dia., mm	Lg., mm	Circuit Protection	Temp. Range, ° F	Enclosure Rating		Each		Each
Stainless Steel Housing







				With 4-Pole M12 Plug-In Connection

				1	PNP	40 mm to 300 mm	10 to 30	IO-Link	18	61	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	8058N13	0000000	6897K36	000000


				2	PNP	150 mm to 1.6 m	10 to 30	IO-Link	18	98	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	8058N14	000000	6897K36	00000
				2	PNP	250 mm to 3.5 m	10 to 30	IO-Link	30	103	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	8058N15	000000	6897K36	00000

90° Elbow


	4-Pole M12 Plug

Switches with PNP/NPN signal output automatically produce the signal you need based on the connected device.

90° elbow switches are compact to fit in tight spaces. They’re best for conveyors.

NEMA 6 Enclosure Rating—NEMA 6 rated switches also stand up to weather and washdowns.

	Sensors														Cables with Socket
	No. of Outputs	Output Digital Signal	Sensing Distance	Input Voltage, V DC	Control Communication Protocol	Dia., mm	Lg., mm	Wd., mm	Ht., mm	Circuit Protection	Temp. Range, ° F	Enclosure Rating		Each		Each
Plastic Housing







				With 4-Pole M12 Plug-In Connection

				1	PNP	40 mm to 300 mm	10 to 30	IO-Link	18	38	20	53	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	8058N11	0000000	6897K36	000000


				1	PNP	80 mm to 1.2 m	10 to 30	IO-Link	18	38	20	53	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	8058N12	000000	6897K36	00000
				1	PNP/NPN	100 mm to 1 m	10 to 30	—	30	45	40	64	Overload, Reverse Polarity, Short Circuit	-40 to 155	IP67, NEMA 6	6565K65	000000	6897K36	00000
				1	PNP/NPN	200 mm to 2 m	10 to 30	—	30	45	40	64	Overload, Reverse Polarity, Short Circuit	-40 to 155	IP67, NEMA 6	6565K66	000000	6897K36	00000
				1	PNP/NPN	300 mm to 3 m	10 to 30	—	30	45	40	64	Overload, Reverse Polarity, Short Circuit	-40 to 155	IP67, NEMA 6	6565K95	000000	6897K36	00000

Ultrasonic Transmitters

Measure the distance to objects and the level of liquids and materials despite size, shape, or surface finish, and send that information to other parts of your system. Unlike photoelectric switches, which use light to detect objects, these transmitters emit high-frequency sound waves that target small spots, so the surface and structure of your object won’t affect results. This makes them great for materials with uneven surfaces, such as granules and powder. They also sense objects in dirty and wet places, but they don’t work well where there’s wind, since it could disrupt their sound waves. Use their plug to quickly connect and disconnect to cables with a socket (sold separately). UL listed, C-UL listed, and CE marked, they meet American, Canadian, and European safety standards.

All transmitters have an analog output, which means they continuously send measurements to monitor status and manage components in your system.

Rated IP67, all of these transmitters seal out dust and water if briefly submersed.

Straight


	4-Pole M12 Plug

Digital—Some transmitters also have a digital output that signals your controller to turn components on or off whenever an object is detected or a set level is reached.

IO-Link Communication Protocol—Transmitters with IO Link connect to a programmable logic controller (PLC), so you can remotely change settings and receive error messages. You need an IO-Link controller (not included) to connect.

	Sensors														Cables with Socket
	No. of Outputs	Signal Output	Output Analog Signal	Sensing Distance	Input Voltage, V DC	Control Communication Protocol	Dia., mm	Lg., mm	Housing Material	Circuit Protection	Temp. Range, ° F	Enclosure Rating		Each		Each
With 4-Pole M12 Plug-In Connection







				Analog

				1	—	4 mA to 20 mA	40 mm to 300 mm	10 to 30	—	18	61	Stainless Steel	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	7635N15	0000000	6897K36	000000


				1	—	4 mA to 20 mA	80 mm to 1.2 m	10 to 30	—	18	61	Stainless Steel	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	7635N16	000000	6897K36	00000




						Digital/Analog

						2	PNP	4 mA to 20 mA	150 mm to 1.6 m	10 to 30	IO-Link	18	98	Stainless Steel	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	7635N17	000000	6897K36	00000


						2	PNP	4 mA to 20 mA	250 mm to 3.5 m	10 to 30	IO-Link	30	103	Stainless Steel	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	7635N18	000000	6897K36	00000

90° Elbow


	4-Pole M12 Plug

90° elbow transmitters are compact to fit in tight spaces. They’re best for conveyors.

Digital—Some transmitters also have a digital output that signals your controller to turn components on or off whenever an object is detected or a set level is reached.

NEMA 6 Enclosure Rating—NEMA 6 rated transmitters also stand up to weather and washdowns.

	Sensors															Cables with Socket
	No. of Outputs	Signal Output	Output Analog Signal	Sensing Distance	Input Voltage, V DC	Dia., mm	Lg., mm	Wd., mm	Ht., mm	Housing Material	Circuit Protection	Temp. Range, ° F	Enclosure Rating		Each		Each
With 4-Pole M12 Plug-In Connection







				Analog

				1	—	4 mA to 20 mA	100 mm to 1 m	10 to 30	30	45	40	64	Plastic	Overload, Reverse Polarity, Short Circuit	-40 to 155	IP67, NEMA 6	6565K32	0000000	6897K36	000000


				1	—	4 mA to 20 mA	200 mm to 2 m	10 to 30	30	45	40	64	Plastic	Overload, Reverse Polarity, Short Circuit	-40 to 155	IP67, NEMA 6	6565K44	000000	6897K36	00000
				1	—	0V DC to 10V DC	100 mm to 1 m	10 to 30	30	45	40	64	Plastic	Overload, Reverse Polarity, Short Circuit	-40 to 155	IP67, NEMA 6	6565K92	000000	6897K36	00000
				1	—	0V DC to 10V DC	300 mm to 3 m	10 to 30	30	45	40	64	Plastic	Overload, Reverse Polarity, Short Circuit	-40 to 155	IP67, NEMA 6	6565K94	000000	6897K36	00000




						Digital/Analog

						2	PNP	4 mA to 20 mA	40 mm to 300 mm	10 to 30	18	38	20	53	Plastic	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	7635N11	000000	6897K36	00000


						2	PNP	4 mA to 20 mA	80 mm to 1.2 m	10 to 30	18	38	20	53	Plastic	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	7635N12	000000	6897K36	00000
						2	PNP	0V DC to 10V DC	40 mm to 300 mm	10 to 30	18	38	20	53	Plastic	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	7635N13	000000	6897K36	00000
						2	PNP	0V DC to 10V DC	80 mm to 1.2 m	10 to 30	18	38	20	53	Plastic	Overload, Reverse Polarity, Short Circuit	0 to 155	IP67	7635N14	000000	6897K36	00000

Horizontal-Mount Compressed-Air Float Switches for Fuels and Oils

Install these switches through a tank wall. They actuate with a compressed air valve instead of an electrical signal. Use them with diesel fuel, hydraulic fluid, oil, and water.

Fail-Open Valve—For switches with a fail-open valve starting position, the air valve closes when liquids move the float.

Fail-Closed Valve—For switches with a fail-closed valve starting position, the air valve opens when liquids move the float.

	Pipe											Air
	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Air Inlet Pressure, psi	Float Material	Overall Lg.	No. of Ports	For Tube ID	Gender		Each
303 Stainless Steel Body







				Fail-Open Valve

				1	NPT	Male	0.5	200 psi @ 70° F	35 to 120	2 7/8"	30 to 85	304 Stainless Steel	6 7/8"	3	3/32"	Male	3792K51	0000000




						Fail-Closed Valve

						1	NPT	Male	0.5	200 psi @ 70° F	35 to 120	2 7/8"	30 to 85	304 Stainless Steel	6 7/8"	3	3/32"	Male	3792K41	000000

Infrared Noncontact Level Sensor Switches for Chemicals

Detect chemical level with infrared light to avoid false switch activation caused by vibration in your tank. Also known as optical switches, these sense the level by reflecting light into a receiver that sends an output current to activate an alarm or control circuit. They are sensitive to light and should be shielded or used in enclosed tanks. Mount them horizontally or vertically.

SPST-NC—SPST-NC switches activate when the tip is exposed to air and light reflects into the receiver.

SPST-NO—SPST-NO switches activate when the tip is submerged in liquid and light stops reflecting into the receiver.

	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Output Current, mA	Overall Lg.	Hex Size	Electrical Connection		Each
10V DC to 40V DC Input Voltage







	Polysulfone Body

	3/8	BSPP	Male	145 psi @ 70° F	0 to 175	1 3/4"	1 Off	SPST-NO	200	3"	1 1/16"	Wire Leads	4949K35	0000000


	3/8	BSPP	Male	145 psi @ 70° F	0 to 175	1 3/4"	1 On	SPST-NC	200	3"	1 1/16"	Wire Leads	4949K33	000000

Hazardous Location Float Switches for Water

For use in locations with flammable gases and combustible dust, these switch are UL listed and CSA certified for Class I, Divisions 1 and 2, Groups C and D; and Class II, Divisions 1 and 2, Groups E, F, and G. Mount them vertically through the top of your tank. They're rated NEMA 4 for protection from washdowns.

	Pipe											Float			Conduit
	Size	Thread Type	Gender	Min. Specific Gravity	Max. Pressure @ Temp.	Temp. Range, ° F	Insertion Dp.	Switch Starting Position	Switch Designation	Current @ Voltage	Mounting Location	Lg.	Dia.	Electrical Connection	Trade Size	Thread Type	Gender	Certification		Each
120V AC/240V AC Input Voltage







				Brass Body and 316 Stainless Steel Float

				1 1/2	NPT	Male	0.7	100 psi @ 70° F	35 to 275	5 1/4"	1 Off or 1 On	SPDT	10 amp @ 120V AC	Top	4 1/2"	1 5/8"	Wire Leads	3/4	NPT	Female	UL Listed, CSA Certified, FM Approved	5363N13	0000000


				1 1/2	NPT	Male	0.7	100 psi @ 70° F	35 to 275	7 1/4"	1 Off or 1 On	SPDT	10 amp @ 120V AC	Top	4 1/2"	1 5/8"	Wire Leads	3/4	NPT	Female	UL Listed, CSA Certified, FM Approved	5363N16	000000
				1 1/2	NPT	Male	0.7	100 psi @ 70° F	35 to 275	9 1/4"	1 Off or 1 On	SPDT	10 amp @ 120V AC	Top	4 1/2"	1 5/8"	Wire Leads	3/4	NPT	Female	UL Listed, CSA Certified, FM Approved	4914K96	000000
				2	NPT	Male	0.7	100 psi @ 70° F	35 to 275	9 1/4"	1 Off or 1 On	SPDT	10 amp @ 120V AC	Top	4 1/2"	1 5/8"	Wire Leads	3/4	NPT	Female	UL Listed, CSA Certified, FM Approved	5363N11	000000

Hazardous-Location Submersible Liquid-Level Transmitters

For Liquids

FM and C-FM approved, these transmitters safely measure liquid levels where explosive gas or dust may be present. Set them at the bottom of your tank in applications that make traditional mounting difficult. They sense liquid levels by measuring the pressure from the weight of the liquid above them. All continuously send measurements, so you can monitor status and manage components in your system. Also known as level loggers, level sensors, and pressure transducers.

				Overall
	For Pressure	Accuracy	Max. Pressure @ Temp.	Dia.	Lg.	Temp. Range, ° F	Cable Lg., ft.	Input Voltage, V DC	For Container Type	Electrical Connection	Hazardous Location Rating	Enclosure Rating		Each
4 mA to 20 mA Output Signal







				For Liquids

				0 psi to 1 psi / 0 to 3 ft. H₂O	±0.25%	10 psi @ 70° F	1"	6 3/4"	-10 to 175	40	10 to 35	Open Tank	Wire Leads	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2	NEMA 6P	3450K51	0000000


				0 to 2 psi / 0 to 5 ft. H₂O	±0.25%	20 psi @ 70° F	1"	6 3/4"	-10 to 175	40	10 to 35	Open Tank	Wire Leads	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2	NEMA 6P	3450K53	000000
				0 to 4 psi / 0 to 10 ft. H₂O	±0.25%	40 psi @ 70° F	1"	6 3/4"	-10 to 175	40	10 to 35	Open Tank	Wire Leads	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2	NEMA 6P	3450K55	000000
				0 to 6 psi / 0 to 15 ft. H₂O	±0.25%	60 psi @ 70° F	1"	6 3/4"	-10 to 175	40	10 to 35	Open Tank	Wire Leads	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2	NEMA 6P	3450K57	000000
				0 to 13 psi / 0 to 30 ft. H₂O	±0.25%	125 psi @ 70° F	1"	6 3/4"	-10 to 175	40	10 to 35	Open Tank	Wire Leads	NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2	NEMA 6P	3450K59	000000