3-A Sensors | McMaster-Carr

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FDA Compliant 21 CFR 177.2415

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For Use With

39 Products

Sanitary Pressure Transmitters

For use in sanitary applications such as food processing, these transmitters are 3-A certified. They have a sanitary quick-clamp connection for easy disassembly in systems that require frequent cleaning. These transmitters are rated IP66, IP69K, and NEMA 4X to resist washdowns and corrosion. Also known as transducers, they convert pressure to an electrical signal that can be interpreted by receiving devices, such as remote displays, programmable logic controllers, and motor speed controls to monitor pressure or control equipment. As pressure increases, the output signal from the transmitter will increase. For your receiving device to interpret the signal from the transmitter, you will need to calibrate it for the transmitter's pressure range and output signal. Transmitters are accurate only within the pressure range.

These transmitters connect using two wires to send a 4-20mA output current. The same wire is used to send a signal to the receiver and to power the transmitter. Current doesn’t lose signal over long distances and isn’t affected by electrical interference from other devices. Transmitters are compatible with M12 sockets.

4 mA to 20 mA Output Signal—5-Pole M12 Plug Connection

Image of Product. Front orientation. Contains Annotated. Pressure Transmitters. Sanitary Pressure Transmitters.

	For Flange OD	Pressure Range, psi	Max. Continuous Pressure, psi	Max. Short-Term Pressure, psi	Input Voltage, V DC	Ht.	Wd.	Enclosure Rating	Food Industry Std.	Certification	For Use With	Accuracy	Housing Material	Connection Material	Temp. Range, ° F		Each
Connects to Quick-Clamp Tube



	1 1/2"	1.984"	0 to 15	15	30	10 to 40	2 5/16"	2 7/16"	IP66, IP69K, NEMA 4X	3-A Certified 74-06	CE Marked	Air Argon Diesel Fuel Gasoline Hydraulic Fluid Nitrogen Water	±0.5%	304 Stainless Steel	316 Stainless Steel	30 to 300	2954N121	0000000


	1 1/2"	1.984"	0 to 50	50	100	10 to 40	2 5/16"	2 7/16"	IP66, IP69K, NEMA 4X	3-A Certified 74-06	CE Marked	Air Argon Diesel Fuel Gasoline Hydraulic Fluid Nitrogen Water	±0.5%	304 Stainless Steel	316 Stainless Steel	30 to 300	2954N122	000000
	1 1/2"	1.984"	0 to 100	100	200	10 to 40	2 5/16"	2 7/16"	IP66, IP69K, NEMA 4X	3-A Certified 74-06	CE Marked	Air Argon Diesel Fuel Gasoline Hydraulic Fluid Nitrogen Water	±0.5%	304 Stainless Steel	316 Stainless Steel	30 to 300	2954N123	000000
	1 1/2"	1.984"	0 to 200	200	400	10 to 40	2 5/16"	2 7/16"	IP66, IP69K, NEMA 4X	3-A Certified 74-06	CE Marked	Air Argon Diesel Fuel Gasoline Hydraulic Fluid Nitrogen Water	±0.5%	304 Stainless Steel	316 Stainless Steel	30 to 300	2954N124	000000
	1 1/2"	1.984"	0 to 500	500	1,000	10 to 40	2 5/16"	2 7/16"	IP66, IP69K, NEMA 4X	3-A Certified 74-06	CE Marked	Air Argon Diesel Fuel Gasoline Hydraulic Fluid Nitrogen Water	±0.5%	304 Stainless Steel	316 Stainless Steel	30 to 300	2954N125	000000
	2"	2.516"	0 to 15	15	30	10 to 40	2 5/16"	2 7/16"	IP66, IP69K, NEMA 4X	3-A Certified 74-06	CE Marked	Air Argon Diesel Fuel Gasoline Hydraulic Fluid Nitrogen Water	±0.5%	304 Stainless Steel	316 Stainless Steel	30 to 300	2954N131	000000
	2"	2.516"	0 to 50	50	100	10 to 40	2 5/16"	2 7/16"	IP66, IP69K, NEMA 4X	3-A Certified 74-06	CE Marked	Air Argon Diesel Fuel Gasoline Hydraulic Fluid Nitrogen Water	±0.5%	304 Stainless Steel	316 Stainless Steel	30 to 300	2954N132	000000
	2"	2.516"	0 to 100	100	200	10 to 40	2 5/16"	2 7/16"	IP66, IP69K, NEMA 4X	3-A Certified 74-06	CE Marked	Air Argon Diesel Fuel Gasoline Hydraulic Fluid Nitrogen Water	±0.5%	304 Stainless Steel	316 Stainless Steel	30 to 300	2954N133	000000
	2"	2.516"	0 to 200	200	400	10 to 40	2 5/16"	2 7/16"	IP66, IP69K, NEMA 4X	3-A Certified 74-06	CE Marked	Air Argon Diesel Fuel Gasoline Hydraulic Fluid Nitrogen Water	±0.5%	304 Stainless Steel	316 Stainless Steel	30 to 300	2954N134	000000
	2"	2.516"	0 to 500	500	1,000	10 to 40	2 5/16"	2 7/16"	IP66, IP69K, NEMA 4X	3-A Certified 74-06	CE Marked	Air Argon Diesel Fuel Gasoline Hydraulic Fluid Nitrogen Water	±0.5%	304 Stainless Steel	316 Stainless Steel	30 to 300	2954N135	000000

Sanitary Conductivity Sensors

Three-Color Display

Image of Attribute. Front orientation. Contains Annotated. Chemistry Meters. Sanitary Conductivity Sensors.

Often used to save rinse water in beverage and pharmaceutical lines, these sensors test the amount of chemicals, cleaners, and other substances in liquids by measuring how well the liquid conducts electricity. They’re 3-A and European Hygienic Engineering and Design Group (EHEDG) certified, thanks to their design that’s easy to keep clean. Highly polished, they limit where bacteria could grow. They also withstand washdowns with hot water, chemicals, and cleaners common to sanitary lines because of their PEEK probe, stainless steel body, and IP ratings. Their IP ratings also mean they’re dust tight and won’t fail if briefly under water. All are FDA compliant to safely touch food.

These sensors work with 4-20 mA analog output to connect to remote displays and programmable logic controllers (PLCs), making them good for hard-to-reach areas and frequent application changes. This also means they’ll set off alarms and trigger cycles to start and stop in automated systems. With the touchscreen, program each color of the display to alert you to errors, completed cycles, and other events. Both the head and the display rotate to view readings from the best angle.

Highly accurate, these sensors test almost any liquid. They also measure temperature—no need for a separate sensor. To compare readings as temperature changes, they automatically standardize readings at 77° F. All meet European safety standards, since they’re CE marked.

For the Manufacturer User Manual, click on a part number and select Product Detail.

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

		Sensor			Conductivity
	Lg., mm	Material	Dia., mm	Lg., mm	Range	Accuracy	Electrical Connection Type	Pipe Size	Thread Type	Gender	ATC Range, ° F	Enclosure Rating	Certification	Food Industry Std.	Cannot Be Sold To		Each
For Use With Liquids



		37	PEEK	3.6	26	0 to 1,000 mS 0 to 500 mS 0 to 500 μS	±1.5% ±1% ±1.5%	Threaded M12 Plug (Two 4-Pole Connections)	1	BSPP	Male	-4 to 302	IP67, IP69K	CE Marked, EHEDG Certified	3-A Certified 74-07, FDA Compliant 21 CFR 177.2415	Canada	6352N21	000000000


		60	PEEK	3.6	26	0 to 1,000 mS 0 to 500 mS 0 to 500 μS	±1.5% ±1% ±1.5%	Threaded M12 Plug (Two 4-Pole Connections)	1	BSPP	Male	-4 to 302	IP67, IP69K	CE Marked, EHEDG Certified	3-A Certified 74-07, FDA Compliant 21 CFR 177.2415	Canada	6352N22	00000000

Straights

		Each
Quick-Clamp Adapter	6352N24	0000000

Sanitary RTD Probes for Liquids and Gas

Designed for clean-in-place applications such as dairy processing and food-preparation areas, these 3-A certified RTDs have a sanitary quick clamp connection for easy removal. Remove the cap on the head to wire the probe’s terminal block to your application.

Screw Terminal Connection

Image of Product. Front orientation. Contains Annotated. RTDs. Sanitary RTD Probes for Liquids and Gas.

			Probe					Conduit Connection
	RTD Probe Resistance, ohm	Temp. Range, ° F	Lg.	Dia.	Accuracy	Response Time, sec.	Flange OD	Pipe Size	Thread Type	Gender	Max. Pressure	Overall Lg.	Sensing Element Material		Each
316 Stainless Steel Probe with Plastic Head







				For 1 1/2" OD Tubes

				100	-325 to 400	4"	1/4"	±0.1%	5	1.984"	3/4	NPT	Female	Not Rated	11"	Platinum	3858K11	0000000




						For 2" OD Tubes

						100	-325 to 400	4"	1/4"	±0.1%	5	2.516"	3/4	NPT	Female	Not Rated	11"	Platinum	3858K12	000000

Food and Beverage Thermowells with Sanitary Quick-Clamp Connection

Isolate thermometers and temperature probes from the contents of dairy and food-processing equipment with these 3-A certified thermowells that have a sanitary quick-clamp connection for easy removal. They require a quick-clamp fitting (not included) for installation.

316 Stainless Steel—316 stainless steel thermowells are extremely resistant to corrosive chemicals.

		For Thermometer
	For Tube OD	Stem Lg.	Stem Dia.	Connection Pipe Size	Connection Thread Type	Connection Gender	Nut Lg.	Insertion Lg.	Flange OD	Food Industry Std.		Each
316 Stainless Steel



		1", 1 1/2"	2 1/2"	1/4"	1/2	NPT	Male	1 1/16"	1 5/8"	1.984"	3-A Certified 74-06	3998K12	0000000


		1", 1 1/2"	4"	1/4"	1/2	NPT	Male	1 3/4"	2 1/2"	1.984"	3-A Certified 74-06	3998K14	000000
		1", 1 1/2"	6"	1/4"	1/2	NPT	Male	1 3/4"	4 1/2"	1.984"	3-A Certified 74-06	3998K16	000000
		1", 1 1/2"	9"	1/4"	1/2	NPT	Male	1 3/4"	7 1/2"	1.984"	3-A Certified 74-06	3998K18	000000
		2"	2 1/2"	1/4"	1/2	NPT	Male	1 1/16"	1 5/8"	2.516"	3-A Certified 74-06	3998K31	000000
		2"	4"	1/4"	1/2	NPT	Male	1 3/4"	2 1/2"	2.516"	3-A Certified 74-06	3998K33	000000
		2"	6"	1/4"	1/2	NPT	Male	1 3/4"	4 1/2"	2.516"	3-A Certified 74-06	3998K35	000000
		2"	9"	1/4"	1/2	NPT	Male	1 3/4"	7 1/2"	2.516"	3-A Certified 74-06	3998K37	000000

Sanitary RTD Probe Transmitters with Digital Display for Liquids and Gas

Check the temperature of liquids in hygienic applications such as food or pharmaceutical lines and tanks. Certified by 3-A to meet sanitary design standards, the parts of these probes that will touch liquid are highly polished to minimize spots where bacteria could grow. They're made of stainless steel, so they won't corrode from harsh cleaners and sanitizers. The housing is IP69K rated, meaning it withstands high-pressure, high-temperature washdowns that are common in hygienic cleaning practices. They have a flange that will connect to sanitary quick clamp fittings (also known as tri-clamp fittings); they're easy to connect and remove from your line.

Program these probes with the touchscreen, and select one of three colors as a visual alert for events in your process such as irregular or fluctuating temperatures. The head swivels 345° and the face rotates all the way around, so you can mount the sensor at any angle and still see the display. To trigger actions in your process line, connect these probes to remote displays, programmable logic controllers (PLCs), and other control equipment with the M12 plug. These probes meet EN 60751, an industry standard for accuracy. They’re also CE marked, meaning they meet European Union safety standards.

5-Pole M12 Plug-In Connection


	Three-Color Display

	RTDs															Cords
			Probe
	RTD Probe Resistance, ohm	Temp. Range, ° F	Lg.	Dia.	Accuracy	Response Time, sec.	Flange OD	Max. Pressure, psi	Overall Lg.	Specs. Met	Voltage, V DC	Output Analog Signal	Features		Each		Each
316L Stainless Steel Probe with 304 Stainless Steel Head (IP69K)







				For 1 1/2" OD Tubes

				100	-55 to 480	2"	5/16"	±0.1%	25	1.988"	580	6 3/4"	EN 60751 Class B	8 to 35	4 mA to 20 mA	Multicolored Backlit Display, Touchscreen	6904N12	0000000	7909N18	000000

Food and Beverage Threaded Thermometers

Dry dials with plastic lenses eliminate the risk of contamination in case of breakage, so these thermometers are often used in food-processing applications.

	Stem								Material
	Lg.	Dia.	Dial Dia.	Pipe Size	Thread Type	Gender	Max. Pressure @ Temp.	Overall Ht.	Housing	Stem	Lens	Accuracy	Choose a Temperature		Each
Back Connection



		2 1/2"	1/4"	3"	1/2	NPT	Male	Not Rated	4 1/8"	Stainless Steel	Stainless Steel	Polycarbonate	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 50° F to 550° F, 0° C to 100° C, 0° C to 150° C	32665K21	0000000


		2 1/2"	1/4"	5"	1/2	NPT	Male	Not Rated	4 1/8"	Stainless Steel	Stainless Steel	Polycarbonate	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 50° F to 550° F, 0° C to 100° C, 0° C to 150° C	32665K51	000000
		4"	1/4"	3"	1/2	NPT	Male	Not Rated	5 5/8"	Stainless Steel	Stainless Steel	Polycarbonate	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 50° F to 550° F, 0° C to 100° C, 0° C to 150° C	32665K22	000000
		4"	1/4"	5"	1/2	NPT	Male	Not Rated	5 5/8"	Stainless Steel	Stainless Steel	Polycarbonate	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 50° F to 550° F, 0° C to 100° C, 0° C to 150° C	32665K52	000000
		6"	1/4"	3"	1/2	NPT	Male	Not Rated	7 5/8"	Stainless Steel	Stainless Steel	Polycarbonate	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 50° F to 550° F, 0° C to 100° C, 0° C to 150° C	32665K23	000000
		6"	1/4"	5"	1/2	NPT	Male	Not Rated	7 5/8"	Stainless Steel	Stainless Steel	Polycarbonate	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 50° F to 550° F, 0° C to 100° C, 0° C to 150° C	32665K53	000000

Food and Beverage Thermometers with Sanitary Quick-Clamp Connection

For dairy, food, and beverage applications that require frequent cleaning, these 3-A certified thermometers have a sanitary quick-clamp connection for easy removal.

	Stem					Material
	Lg.	Dia.	Dial Dia.	For Tube OD	Flange OD	Housing	Stem	Lens	Flange	Food Industry Std.	Accuracy	Choose a Temperature		Each
Back Connection



		2 1/2"	5/16"	3"	1 1/2"	1.984"	Stainless Steel	Stainless Steel	Acrylic Plastic	Stainless Steel	3-A Certified 74-07	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 0° C to 100° C, 0° C to 150° C	32665K11	0000000


		2 1/2"	5/16"	3"	2"	2.516"	Stainless Steel	Stainless Steel	Acrylic Plastic	Stainless Steel	3-A Certified 74-07	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 0° C to 100° C, 0° C to 150° C	32665K41	000000
		2 1/2"	5/16"	5"	1 1/2"	1.984"	Stainless Steel	Stainless Steel	Acrylic Plastic	Stainless Steel	3-A Certified 74-07	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 0° C to 100° C, 0° C to 150° C	32665K15	000000
		2 1/2"	5/16"	5"	2"	2.516"	Stainless Steel	Stainless Steel	Acrylic Plastic	Stainless Steel	3-A Certified 74-07	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 0° C to 100° C, 0° C to 150° C	32665K43	000000
		4 1/2"	5/16"	3"	1 1/2"	1.984"	Stainless Steel	Stainless Steel	Acrylic Plastic	Stainless Steel	3-A Certified 74-07	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 0° C to 100° C, 0° C to 150° C	32665K12	000000
		4 1/2"	5/16"	3"	2"	2.516"	Stainless Steel	Stainless Steel	Acrylic Plastic	Stainless Steel	3-A Certified 74-07	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 0° C to 100° C, 0° C to 150° C	32665K42	000000
		4 1/2"	5/16"	5"	1 1/2"	1.984"	Stainless Steel	Stainless Steel	Acrylic Plastic	Stainless Steel	3-A Certified 74-07	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 0° C to 100° C, 0° C to 150° C	32665K16	000000
		4 1/2"	5/16"	5"	2"	2.516"	Stainless Steel	Stainless Steel	Acrylic Plastic	Stainless Steel	3-A Certified 74-07	±1%	-40° F to 120° F, 0° F to 200° F, 0° F to 250° F, 50° F to 300° F, 0° C to 100° C, 0° C to 150° C	32665K44	000000