Level Transducers | McMaster-Carr

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30 Products

Submersible Liquid-Level Transmitters


For Liquids	For Liquids with Solids

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.

For Liquids with Solids—Transmitters for liquids with solids have sink weights that keep the transmitter in place in applications with moving solids or agitated liquids.

				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




						For Liquids with Solids

						0 to 5 psi / 0 to 11.5 ft. H₂O	±0.5%	7 psi @ 70° F	3 1/4"	5 1/4"	32 to 140	40	12 to 36	Closed Tank, Open Tank	Wire Leads	IP68	3962N15	000000


						0 to 10 psi / 0 to 23 ft. H₂O	±0.5%	15 psi @ 70° F	3 1/4"	5 1/4"	32 to 140	40	12 to 36	Closed Tank, Open Tank	Wire Leads	IP68	3962N16	000000
						0 to 15 psi / 0 to 34 ft. H₂O	±0.5%	22 psi @ 70° F	3 1/4"	5 1/4"	32 to 140	60	12 to 36	Closed Tank, Open Tank	Wire Leads	IP68	3962N17	000000
						0 to 20 psi / 0 to 46 ft. H₂O	±0.5%	30 psi @ 70° F	3 1/4"	5 1/4"	32 to 140	60	12 to 36	Closed Tank, Open Tank	Wire Leads	IP68	3962N18	000000

Hazardous-Location Submersible Liquid-Level Transmitters


For Liquids	For Liquids with Solids

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.

For Liquids with Solids—Transmitters for liquids with solids have an unobstructed sensing element that resists clogging and sludge buildup in water with particulate and sewage.

				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




						For Liquids with Solids

						0 psi to 1 psi / 0 to 3 ft. H₂O	±0.25%	10 psi @ 70° F	1"	5 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	3450K31	00000000


						0 to 2 psi / 0 to 5 ft. H₂O	±0.25%	20 psi @ 70° F	1"	5 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	3450K33	00000000
						0 to 4 psi / 0 to 10 ft. H₂O	±0.25%	40 psi @ 70° F	1"	5 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	3450K35	00000000
						0 to 6 psi / 0 to 15 ft. H₂O	±0.25%	60 psi @ 70° F	1"	5 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	3450K37	00000000
						0 to 13 psi / 0 to 30 ft. H₂O	±0.25%	125 psi @ 70° F	1"	5 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	3450K39	00000000

Ultrasonic Noncontact Level Sensor Switches for Chemicals

Use high-frequency sound waves to detect chemical level. This switch has three relays that can be programmed for multiple set points. Use it to activate several alarms or to automate tank filling and emptying. It’s rated NEMA 4X for protection from corrosion and washdowns.

	Pipe													Conduit
	Size	Thread Type	Gender	Sensing Distance, ft.	Max. Pressure @ Temp.	Temp. Range, ° F	Switch Starting Position	Switch Designation	Current @ Voltage	Lg.	Wd.	Electrical Connection	Enclosure Rating	Trade Size	Thread Type	Gender		Each
95V AC to 250V AC Input Voltage







				Polycarbonate Body

				1	NPT	Male	0.33 to 9.8	30 psi @ 70° F	-5 to 140	1 Off or 1 On	SPDT	0.17 amp @ 120V AC	3 15/16"	5 3/16"	Screw Terminal	IP65, NEMA 4X	1/2	NPT	Female	3785K13	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

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.

	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







				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	0000000	6897K36	000000


				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