Dusty-Environment RTDs | McMaster-Carr

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64 Products

Thermocouple and RTD Connection Heads

Screw-On Cap with

Retaining Chain

Attach these heads to your thermocouple or RTD probe to protect wiring from dust and moisture. The removable cap makes it easy to access your wiring when you need. Install an optional terminal block inside the head to keep your wiring organized.

Hazardous Locations—Hazardous location connection heads are rated for use in Class I, Divisions 1 and 2, Groups A, B, C, and D; Class II, Divisions 1 and 2, Groups E, F, and G; and Class III, Divisions 1 and 2 environments with flammable gases, combustible dust, and combustible fibers.

	Probe Connection			Conduit Connection
	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Includes	Environment	Hazardous Location Rating	Enclosure Rating		Each
Aluminum



		1/2	NPT	Female	3/4	NPT	Female	Screw-On Cap with Retaining Chain	Corrosive, Dusty, Hazardous, Outdoor, Washdown, Wet	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 4X	00000000	0000000


		Stainless Steel



				1/2	NPT	Female	3/4	NPT	Female	Screw-On Cap with Retaining Chain	Dusty, Hazardous, Washdown, Wet	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 NEC Zone 1 Groups IIC, IIB, IIA NEC Zone 21 Groups IIIC, IIIB, IIIA IEC Zone 1 Groups IIC, IIB, IIA IEC Zone 21 Groups IIIC, IIIB, IIIA AEx D IIC Gb AEx Tb IIIC Db Ex D IIC Gb Ex Tb IIIC Db ATEX II 2 GD Ex Db IIC Gb Ex Tb IIIC Db IECEx Ex Db IIC Gb IECEx Ex Tb IIIC Db	IP66	00000000	000000

Threaded RTD Probes with Thermowell for Liquids and Gas

To protect against vibration and shock during temperature measurements, these RTD probes come with a thermowell. Made of stainless steel, it acts as a shield for added protection from corrosion in liquids and gases. The thermowell also lets you replace the probe sensor without stopping flow or draining your system. For accurate readings, a spring pushes the probe tip forward, keeping the tip in constant contact with the thermowell. Rated IP65 and NEMA 4, these probes seal out dust and water from washdowns. Remove the cap on the head to wire the probe’s terminal block to your application.

Screw-Terminal Connection

			Probe				Thermowell Connection			Conduit Connection
	RTD Probe Resistance, ohm	Temp. Range, ° F	Lg.	Dia.	Accuracy	Response Time, sec.	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Overall Lg.	Fitting Material		Each
Spring Loaded 304 Stainless Steel Probe with Thermowell and Cast Iron Head (IP65, NEMA 4)



		100	-55 to 400	6"	1/2"	±0.12%	30	3/4	NPT	Male	3/4	NPT	Female	14 1/8"	Iron	0000000	0000000


		100	-55 to 400	9"	1/2"	±0.12%	30	3/4	NPT	Male	3/4	NPT	Female	17 1/8"	Iron	0000000	000000
		100	-55 to 400	12"	1/2"	±0.12%	30	3/4	NPT	Male	3/4	NPT	Female	20 1/8"	Iron	0000000	000000

RTD Probes for Liquids and Gas

Obtain more precise and reliable liquid and gas temperature measurements than thermocouple probes. Some of these probes meet DIN standards for accuracy, meaning they’re precise even with fast temperature changes.

RTDs

IP68 Enclosure Rating and IP69K Enclosure Rating—IP68- and IP69K-rated probes have plug-in connections that can handle brief submersion and harsh washdowns.

			Probe
	RTD Probe Resistance, ohm	Temp. Range, ° F	Lg.	Dia.	Accuracy	Response Time, sec.	Enclosure Rating	Specs. Met		Each
4-Pin Micro M12 Plug-In Connection—316L Stainless Steel Probe



		100	-40 to 300	2"	1/4"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	0000000


		100	-40 to 300	2 3/4"	1/4"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		100	-40 to 300	3 7/8"	1/4"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		100	-40 to 300	5 7/8"	1/4"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		100	-40 to 300	6 1/4"	3/8"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		100	-40 to 300	7 7/8"	1/4"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		100	-40 to 300	9 7/8"	1/4"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		100	-40 to 300	10 1/4"	3/8"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		100	-40 to 300	13 3/4"	1/4"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		100	-40 to 300	14 1/8"	3/8"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		100	-40 to 300	22"	3/8"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000


		1,000	-40 to 300	6 1/4"	1/4"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		1,000	-40 to 300	6 1/4"	3/8"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		1,000	-40 to 300	10 1/4"	1/4"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		1,000	-40 to 300	10 1/4"	3/8"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		1,000	-40 to 300	14 1/8"	1/4"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		1,000	-40 to 300	14 1/8"	3/8"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000
		1,000	-40 to 300	22"	3/8"	±0.1%	3	IP68, IP69K	EN 60751 Class A	0000000	000000

Cords

Electrical Connection	Electrical Connector Component	Cable Lead Lg., ft.	Voltage	Current, amp	Face Dia.		Each
Micro M12, Wire Leads	Socket	12	250V AC, 250V DC	4	0.3"	0000000	000000

RTDs with Cable

IP67 Enclosure Rating—IP67-rated probes have plug-in connections that stand up to dust and temporary submersion.

			Probe
	RTD Probe Resistance, ohm	Temp. Range, ° F	Lg.	Dia.	Accuracy	Response Time, sec.	Cable Lg., ft.	Max. Cable Temp., ° F	Enclosure Rating	Specs. Met		Each
4-Pin Micro M12 Plug-In Connection—316 Stainless Steel Probe



		100	-145 to 1,110	3 7/8"	1/4"	±0.1%	34	6.5	480	IP67	EN 60751 Class A	0000000	0000000


		100	-145 to 1,110	5 7/8"	1/4"	±0.1%	34	6.5	480	IP67	EN 60751 Class A	0000000	000000
		100	-145 to 1,110	7 7/8"	1/4"	±0.1%	34	6.5	480	IP67	EN 60751 Class A	0000000	000000
		100	-145 to 1,110	7 7/8"	1/4"	±0.1%	34	32	480	IP67	EN 60751 Class A	0000000	000000
		100	-145 to 1,110	9 7/8"	1/4"	±0.1%	34	6.5	480	IP67	EN 60751 Class A	0000000	000000
		1,000	-55 to 480	2"	1/4"	±0.1%	37	0.5	480	IP67	EN 60751 Class A	0000000	000000


		4-Pin Micro M12 Plug-In Connection—316L Stainless Steel Probe



				100	-55 to 480	1 5/8"	3/8"	±0.1%	39	6.5	480	IP67	EN 60751 Class A	0000000	000000


				100	-40 to 190	1 3/4"	1/4"	±0.1%	10	6.5	190	IP67	EN 60751 Class A	0000000	000000
				100	-40 to 190	1 3/4"	1/4"	±0.1%	10	16	190	IP67	EN 60751 Class A	0000000	000000
				100	-40 to 190	2"	3/8"	±0.1%	25	6.5	190	IP67	EN 60751 Class A	0000000	000000
				100	-40 to 190	2"	3/8"	±0.1%	25	16	190	IP67	EN 60751 Class A	0000000	000000
				1,000	-40 to 190	1 3/4"	1/4"	±0.1%	10	6.5	190	IP67	EN 60751 Class A	0000000	000000
				1,000	-40 to 190	2"	3/8"	±0.1%	25	6.5	190	IP67	EN 60751 Class A	0000000	000000

Threaded RTD Probe Transmitters for Liquids and Gas

Send temperature readings directly to programmable logic controllers (PLCs)—with a built-in 4-20mA transmitter, these RTDs don’t require a separate signal converter. They have an NPT male probe connection, so they’re ready to screw into thermowells and other fittings on pipe and tanks. Made of 316 or 316L stainless steel, they resist corroding from harsh cleaning chemicals. This stainless steel also protects the RTD sensor inside from impact. They are also often installed in bores to measure the temperature of molds and dies. CE marked, they meet European safety standards.

Circular DIN Connection

Fixed Probe—Fixed RTDs can be used directly in liquid or steam because they’re welded to their fitting for a liquid-tight seal.

		Probe
	RTD Probe Resistance, ohm	Lg.	Dia.	Accuracy	Response Time	Probe Connection Pipe Size	Voltage, V DC	Max. Pressure, psi	Output Current, mA	Overall Lg.	Fitting Material	Choose a Temperature, ° F		Each
NPT Male Probe Connection—Fixed 316 Stainless Steel Probe with Plastic Head (IP65)



		100	1 3/4"	1/4"	±0.5%	Not Rated	1/2	10 to 30	725	4 to 20	5 3/4"	316 Stainless Steel	-40 to 120 , 0 to 250 , 50 to 400	000000	0000000


		100	3 1/4"	1/4"	±0.5%	Not Rated	1/2	10 to 30	725	4 to 20	7 1/4"	316 Stainless Steel	-40 to 120 , 0 to 250 , 50 to 400	000000	000000
		100	5 1/4"	1/4"	±0.5%	Not Rated	1/2	10 to 30	725	4 to 20	9 1/4"	316 Stainless Steel	-40 to 120 , 0 to 140 , 50 to 400	000000	000000
		100	8 1/4"	1/4"	±0.5%	Not Rated	1/2	10 to 30	725	4 to 20	12 1/4"	316 Stainless Steel	-40 to 120 , 0 to 200 , 50 to 400	000000	000000
		100	11 1/4"	1/4"	±0.5%	Not Rated	1/2	10 to 30	725	4 to 20	15 1/4"	316 Stainless Steel	-40 to 120 , 0 to 250 , 50 to 400	0000000	000000

4-Pole Micro M12 Plug-In Connection

Image of Product. Front orientation. Contains Annotated. RTDs. Threaded RTD Probe Transmitters for Liquids and Gas, Micro M12 Connection.

Fixed Probe—Fixed RTDs can be used directly in liquid or steam because they’re welded to their fitting for a liquid-tight seal.

IO Link Communication Protocol—RTDs with IO Link let you remotely adjust settings, read measurements, and receive error messages when connected to a PLC via an IO Link controller (not included). These RTDs meet EN 60751 Class A standards for temperature accuracy. UL and C-UL listed, they meet American and Canadian safety standards.

		Probe
	RTD Probe Resistance, ohm	Lg.	Dia.	Accuracy	Response Time, sec.	Probe Connection Pipe Size	Voltage, V DC	Max. Pressure, psi	Output Current, mA	Communication Protocol	Overall Lg.	Fitting Material	Temp., ° F		Each
NPT Male Probe Connection—Fixed 316L Stainless Steel Probe (IP67, IP68, IP69K)



		1,000	11/16"	1/4"	±0.5%	3	1/2	18 to 32	5,800	4 to 20	IO Link	4 1/8"	316L Stainless Steel	0 to 300	0000000	0000000


		1,000	1 1/2"	1/4"	±0.5%	3	1/2	18 to 32	4,350	4 to 20	IO Link	5"	316L Stainless Steel	0 to 300	0000000	000000
		1,000	3 1/2"	1/4"	±0.5%	3	1/2	18 to 32	4,350	4 to 20	IO Link	7"	316L Stainless Steel	0 to 300	0000000	000000
		1,000	5 7/16"	1/4"	±0.5%	3	1/2	18 to 32	4,350	4 to 20	IO Link	8 7/8"	316L Stainless Steel	0 to 300	0000000	000000

Cords

Electrical Connection	Electrical Connector Component	Cable Lead Lg., ft.	Voltage	Current, amp	Face Dia.		Each
Micro M12, Wire Leads	Socket	12	250V AC, 250V DC	4	0.3"	0000000	000000

Bolt-On RTD Probes for Surfaces


Style A	Style B

For reliable temperature readings in high-vibration environments, these RTD probes bolt onto the surface of motors and other equipment.

Micro M12 Plug Connection

Style A

Style A—Style A and B probes are rated IP67 for protection from dust and temporary submersion.

EN 60751 Class A—Probes that meet EN 60751 adhere to industry standards for accuracy.

					Probe						Cable
	Style	RTD Probe Resistance, ohm	Temp. Range, ° F	Bolt Hole Dia.	Lg.	Wd.	Thk.	Accuracy	Response Time, sec.	Max. Pressure	Lg., ft.	Material	Specs. Met		Each
Stainless Steel Probe (IP67)



		A	100	-40 to 190	1/2"	2"	0.438"	0.313"	±0.5%	15	Not Rated	6	Polyurethane Rubber	EN 60751 Class A	0000000	0000000

Wire-Ferrule Connection

Style B

Style B—Style A and B probes are rated IP67 for protection from dust and temporary submersion.

EN 60751 Class A—Probes that meet EN 60751 adhere to industry standards for accuracy.

					Probe						Cable		Wire
	Style	RTD Probe Resistance, ohm	Temp. Range, ° F	Bolt Hole Dia.	Lg.	Wd.	Thk.	Accuracy	Response Time, sec.	Max. Pressure	Lg., ft.	Material	Lead Lg.	AWG	No. of Wires	Wire Color	Specs. Met		Each
Stainless Steel Probe (IP67)



		B	100	-40 to 190	1/4"	1 13/16"	0.438"	0.313"	±0.5%	39	Not Rated	6	Polyurethane Rubber	1"	22	4	Brown/Blue/Black/White	EN 60751 Class A	0000000	000000

Threaded RTD Probes for Surfaces


Style A	Style B

Thread these RTD probes into threaded holes in molds, dies, and other objects to measure their temperature.

Micro M12 Plug Connection

Style A

Style A—Style A and B probes are rated IP67 for protection from dust and temporary submersion.

EN 60751 Class A—Probes that meet EN 60751 adhere to industry standards for accuracy.

					Probe						Cable
	Style	RTD Probe Resistance, ohm	Temp. Range, ° F	Thread Size	Lg.	Wd.	Thk.	Accuracy	Response Time, sec.	Max. Pressure	Lg., ft.	Material	Specs. Met		Each
Stainless Steel Probe (IP67)



		A	100	-40 to 190	M5 × 0.8 mm	15/16"	0.313"	0.188"	±0.5%	8	Not Rated	6	Polyurethane Rubber	EN 60751 Class A	0000000	0000000


		A	100	-40 to 190	M6 × 1 mm	15/16"	0.313"	0.188"	±0.5%	9	Not Rated	6	Polyurethane Rubber	EN 60751 Class A	0000000	000000
		A	100	-20 to 350	M5 × 0.8 mm	15/16"	0.313"	0.188"	±0.5%	8	Not Rated	6	Silicone Rubber	EN 60751 Class A	0000000	000000
		A	100	-20 to 350	M6 × 1 mm	15/16"	0.313"	0.188"	±0.5%	8	Not Rated	6	Silicone Rubber	EN 60751 Class A	0000000	000000

Wire-Ferrule Connection

Style B

Style B—Style A and B probes are rated IP67 for protection from dust and temporary submersion.

EN 60751 Class A—Probes that meet EN 60751 adhere to industry standards for accuracy.

					Probe						Cable		Wire
	Style	RTD Probe Resistance, ohm	Temp. Range, ° F	Thread Size	Lg.	Wd.	Thk.	Accuracy	Response Time, sec.	Max. Pressure	Lg., ft.	Material	Lead Lg.	AWG	No. of Wires	Wire Color	Specs. Met		Each
Stainless Steel Probe (IP67)



		B	100	-20 to 300	M12 × 1.5 mm	1 3/16"	0.375"	0.688"	±0.5%	12	Not Rated	16	Silicone Rubber	1"	22	4	Red/White	EN 60751 Class A	0000000	0000000

Threaded RTD Probe Transmitters with Digital Display for Liquids and Gas

View temperature readings and adjust settings directly on these RTD probe transmitters. To communicate with programmable logic controllers (PLCs), they have a built-in transmitter with two outputs. One output can send a digital switching signal or use IO Link protocol with the addition of an IO Link controller (not included). The other can send a digital switching signal or a 4-20mA analog signal. The different output options make these RTDs good for a wide range of uses, including operating far away from a controller, taking automated measurements, and providing inputs to switching applications. All have an NPT threaded fitting welded onto the probe, so they’re ready to screw into containers, tanks, and pipes. Probe length is fixed. Made of 316L stainless steel, they are highly corrosion resistant.

These RTDs meet EN 60751 Class A standards for temperature accuracy. UL Listed, C-UL Listed, and CE Marked, all meet American, Canadian, and European safety standards.

4-Pole Micro M12 Plug-In Connection

			Probe						Configurable Digital Output			Configurable Analog/Digital Output
	RTD Probe Resistance, ohm	Temp. Range, ° F	Lg.	Dia.	Accuracy	Response Time, sec.	Probe Connection Pipe Size	Max. Pressure, psi	No. of	Communication Protocol	Signal Output	No. of	Current, mA	Signal Output	Overall Lg.	Fitting Material	Sensing Element Material	Specs. Met	Voltage, V DC		Each
NPT Male Probe Connection—Fixed 316L Stainless Steel Probe with Plastic Head (IP67)



		1,000	-55 to 300	1/2"	1/4"	±0.75%	3	1/4	5,800	1	IO Link	NPN/PNP	1	4 to 20	NPN/PNP	4 7/8"	316L Stainless Steel	Platinum	EN 60751 Class A	18 to 32	0000000	0000000


		1,000	-55 to 300	1/2"	1/4"	±0.75%	3	1/2	4,350	1	IO Link	NPN/PNP	1	4 to 20	NPN/PNP	4 7/8"	316L Stainless Steel	Platinum	EN 60751 Class A	18 to 32	0000000	000000
		1,000	-55 to 300	1 1/4"	1/4"	±0.75%	3	1/4	5,800	1	IO Link	NPN/PNP	1	4 to 20	NPN/PNP	5 5/8"	316L Stainless Steel	Platinum	EN 60751 Class A	18 to 32	0000000	000000
		1,000	-55 to 300	1 1/4"	1/4"	±0.75%	3	1/2	4,350	1	IO Link	NPN/PNP	1	4 to 20	NPN/PNP	5 5/8"	316L Stainless Steel	Platinum	EN 60751 Class A	18 to 32	0000000	000000
		1,000	-55 to 300	3 1/4"	1/4"	±0.75%	3	1/2	3,625	1	IO Link	NPN/PNP	1	4 to 20	NPN/PNP	7 5/8"	316L Stainless Steel	Platinum	EN 60751 Class A	18 to 32	0000000	000000
		1,000	-55 to 300	5 3/16"	1/4"	±0.75%	3	1/2	3,625	1	IO Link	NPN/PNP	1	4 to 20	NPN/PNP	9 1/2"	316L Stainless Steel	Platinum	EN 60751 Class A	18 to 32	0000000	000000

Cords

Electrical Connection	Electrical Connector Component	Cable Lead Lg., ft.	Voltage	Current, amp	Face Dia.		Each
Micro M12, Wire Leads	Socket	12	250V AC, 250V DC	4	0.3"	0000000	000000

RTD Transmitters

Convert signals from your RTD probe into signal types that data loggers, controllers, and other instruments can read.

Thread In

Thread-in transmitters automatically recognize the probe type, so you don’t need to program them to match. They communicate via IO Link, which lets you change settings, read measurements, and receive error messages remotely when connected to a PLC via an IO Link controller (not included).

	Temp. Range, ° F	Dia.	Dp.	Voltage, V DC	Output Current, mA	Output Voltage, V DC	Communication Protocol	Housing Material	Enclosure Rating		Each
4-Pole Micro M12



	100/1,000	-55 to 300	3/4"	2"	20 to 32	4 to 20	—	IO Link	Plastic	IP67	00000000	0000000


	100/1,000	32 to 212	3/4"	2"	18 to 32	—	0 to 10	IO Link	Plastic	IP67	00000000	000000
	100/1,000	32 to 212	3/4"	2"	20 to 32	4 to 20	—	IO Link	Plastic	IP67	00000000	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 Micro 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 Current, mA	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 to 20	Multicolored Backlit Display, Touchscreen	0000000	0000000	0000000	000000