Threaded-Mount RTDs | McMaster-Carr

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71 Products

Threaded RTD Probes for Liquids and Gas

With an NPT male probe connection, these RTDs are ready to install in thermowells and other fittings on pipe and tanks. They’re often used to measure temperature in water lines and low-pressure steam lines. Made of stainless steel, these probes resist corrosion and shield the RTD sensor inside from impact. They can also be installed in a bore to measure the temperature of molds and dies.

Wire-Lead Connection


Fixed Probe	Spring-Loaded Probe

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

Spring-Loaded Probe—Spring-loaded probes help ensure accurate readings in vibration-heavy environments. A spring inside the fitting pushes the probe forward, so the probe tip maintains contact with the end of a thermowell. However, these probes aren’t liquid-tight, so they must be installed inside a thermowell or protection sleeve.

			Probe						Wire
	RTD Probe Resistance, ohm	Temp. Range, ° F	Lg.	Dia.	Accuracy	Response Time, sec.	Probe Connection Pipe Size	Fitting Material	Lead Lg.	AWG	No. of Wires	Wire Color		Each
NPT Male Probe Connection—Fixed 304 Stainless Steel Probe



		100	-55 to 400	3"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	3	Red/White	0000000	000000


		100	-55 to 400	4 1/2"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	3	Red/White	0000000	00000
		100	-55 to 400	6"	1/4"	±0.12%	3.5	1/2	316 Stainless Steel	3"	24	3	Red/White	0000000	00000
		100	-55 to 400	6 5/8"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	3	Red/White	0000000	000000
		100	-55 to 400	12"	1/4"	±0.12%	3.5	1/2	316 Stainless Steel	3"	24	3	Red/White	0000000	00000
		100	-55 to 400	12 5/8"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	3	Red/White	0000000	000000
		100	-55 to 400	18"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	3	Red/White	0000000	00000
		100	-55 to 400	24"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	3	Red/White	0000000	00000
		100	-55 to 400	36"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	3	Red/White	0000000	00000


		NPT Male Probe Connection—Fixed 316 Stainless Steel Probe



				100	-55 to 1,200	6"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	3	Red/White	0000000	000000


				NPT Male Probe Connection—Spring Loaded 304 Stainless Steel Probe



						100	-55 to 400	6"	1/4"	±0.12%	10	1/2	304 Stainless Steel	3"	24	3	Red/White	0000000	00000


						100	-55 to 400	12"	1/4"	±0.12%	10	1/2	304 Stainless Steel	3"	24	3	Red/White	0000000	00000
						100	-55 to 400	18"	1/4"	±0.12%	10	1/2	304 Stainless Steel	3"	24	3	Red/White	0000000	00000
						100	-55 to 400	24"	1/4"	±0.12%	10	1/2	304 Stainless Steel	3"	24	3	Red/White	0000000	00000

Threaded RTD Probes for Surfaces


Style A	Style B	Style C

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

Wire-Lead Connection

Style C

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

MIL-STD-202 Method 204 Test Condition D—Probes that meet MIL-STD-202 Method 204 Test Condition D have been tested for use in vibration-heavy environments.

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



		C	100	-55 to 500	1/4"-20	3/8"	±0.12%	10	Not Rated	3	PTFE	1/2"	26	3	Red/White	EN 60751 Class B	MIL-STD-202 Method 204 Test Condition D	0000000	0000000


		C	1,000	-55 to 500	1/4"-20	3/8"	±0.12%	10	Not Rated	3	PTFE	1/2"	24	2	Red/White	—	MIL-STD-202 Method 204 Test Condition D	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

Screw-Terminal Connection

RTDs with a screw terminal connection have a cap you can remove to wire the RTD’s terminal block to your application.

Spring-Loaded Probe—Spring-loaded RTDs are not liquid-tight, so they must be installed in a thermowell or protection tube. The spring inside the fitting pushes the probe against the thermowell to provide an accurate reading.

	RTDs																	Replacement RTD Elements
		Probe					Conduit Connection
	RTD Probe Resistance, ohm	Lg.	Dia.	Accuracy	Response Time, sec.	Probe Connection Pipe Size	Pipe Size	Thread Type	Gender	Voltage, V DC	Max. Pressure	Output Current, mA	Overall Lg.	Fitting Material	Choose a Temperature, ° F		Each		Each
NPT Male Probe Connection—Spring Loaded 316 Stainless Steel Probe with Aluminum Head



		100	3 3/4"	1/4"	±0.1%	6	1/2	3/4	NPT	Female	10 to 30	Not Rated	4 to 20	9"	316 Stainless Steel	0 to 100 , 0 to 200 , 0 to 300 , 0 to 400	0000000	0000000	00000000	0000000


		100	5 3/4"	1/4"	±0.1%	6	1/2	3/4	NPT	Female	10 to 30	Not Rated	4 to 20	11"	316 Stainless Steel	0 to 100 , 0 to 200 , 0 to 300 , 0 to 400	0000000	000000	00000000	000000
		100	8 3/4"	1/4"	±0.1%	6	1/2	3/4	NPT	Female	10 to 30	Not Rated	4 to 20	14"	316 Stainless Steel	0 to 100 , 0 to 200 , 0 to 300 , 0 to 400	0000000	000000	00000000	000000
		100	11 3/4"	1/4"	±0.1%	6	1/2	3/4	NPT	Female	10 to 30	Not Rated	4 to 20	17"	316 Stainless Steel	0 to 100 , 0 to 200 , 0 to 300 , 0 to 400	0000000	000000	00000000	000000

Replacement RTD Transmitters

Temp. Range, ° F	Wire Connection	Each
0 to 100	Screw Terminal	0000000
0 to 200	Screw Terminal	000000
0 to 300	Screw Terminal	000000
0 to 400	Screw Terminal	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

Thermocouple and RTD Protection Tubes

Designed for use with thermocouples and RTDs in large, nonpressurized tanks, these protection tubes are available in long lengths at a lower cost than thermowells.

Steel—Steel protection tubes are more durable than ceramic protection tubes.

316 Stainless Steel—316 stainless steel protection tubes are more durable than ceramic protection tubes. They are extremely resistant to corrosive chemicals, and they can handle higher temperatures than steel protection tubes.

Ceramic—Ceramic protection tubes withstand temperatures nearly twice as high as 316 stainless steel protection tubes.

	Thermowell Connection			Conduit Connection							Tube
	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Max. Temp., ° F	Insertion Lg.	For Max. Probe Dia.	Overall Lg.	Inner Dia.	Outer Dia.		Each
Steel



		1/4	NPT	Male	1/2	NPT	Male	1,000	10 1/4"	3/8"	12"	3/8"	9/16"	0000000	000000


		1/2	NPT	Male	3/4	NPT	Male	1,000	10 1/4"	1/2"	12"	5/8"	7/8"	0000000	00000
		1/2	NPT	Male	3/4	NPT	Male	1,000	16 1/4"	1/2"	18"	5/8"	7/8"	0000000	00000
		1/2	NPT	Male	3/4	NPT	Male	1,000	22 1/4"	1/2"	24"	5/8"	7/8"	0000000	000000
		3/4	NPT	Male	1	NPT	Male	1,000	10 1/4"	3/4"	12"	7/8"	1 1/16"	0000000	00000


		316 Stainless Steel



				1/4	NPT	Male	1/2	NPT	Male	1,700	10 1/4"	3/8"	12"	3/8"	9/16"	0000000	000000


				1/4	NPT	Male	1/2	NPT	Male	1,700	16 1/4"	3/8"	18"	3/8"	9/16"	0000000	000000
				1/4	NPT	Male	1/2	NPT	Male	1,700	22 1/4"	3/8"	24"	3/8"	9/16"	0000000	000000
				1/2	NPT	Male	3/4	NPT	Male	1,700	10 1/4"	1/2"	12"	5/8"	7/8"	0000000	000000
				1/2	NPT	Male	3/4	NPT	Male	1,700	16 1/4"	1/2"	18"	5/8"	7/8"	0000000	000000
				1/2	NPT	Male	3/4	NPT	Male	1,700	22 1/4"	1/2"	24"	5/8"	7/8"	0000000	000000
				3/4	NPT	Male	1	NPT	Male	1,700	16 1/4"	3/4"	18"	7/8"	1 1/16"	0000000	000000
				3/4	NPT	Male	1	NPT	Male	1,700	22 1/4"	3/4"	24"	7/8"	1 1/16"	0000000	000000


				Ceramic



						1/2	NPT	Male	3/4	NPT	Male	3,100	11 1/4"	7/16"	13 1/8"	7/16"	11/16"	0000000	00000


						1/2	NPT	Male	3/4	NPT	Male	3,100	17 1/4"	7/16"	19 1/8"	7/16"	11/16"	0000000	00000
						1/2	NPT	Male	3/4	NPT	Male	3,100	23 1/4"	7/16"	25 1/8"	7/16"	11/16"	0000000	00000

Dual-Output Threaded RTD Probes for Liquids and Gas

Send temperature readings to two separate devices—these probes have two RTD sensors inside. For example, one RTD might connect to a data logger while the other connects to a PLC that automates processes based on temperature. These probes have an NPT male threaded fitting, so they’re ready to install in thermowells and other fittings on pipe and tanks. For direct immersion in liquid and gas processes, such as water lines and low-pressure steam lines, the fitting is welded to the sheath to fully enclose the RTDs. The sheath protects the sensors from impact. You can also install these probes in a bore to measure the temperature of molds and dies.

Wire-Lead Connection

Image of Product. Front orientation. Contains Annotated. RTDs. Dual-Output Threaded RTD Probes for Liquids and Gas.

			Probe						Wire
	RTD Probe Resistance, ohm	Temp. Range, ° F	Lg.	Dia.	Accuracy	Response Time, sec.	Probe Connection Pipe Size	Fitting Material	Lead Lg.	AWG	No. of Wires	Wire Color		Each
NPT Male Probe Connection—Fixed 304 Stainless Steel Probe



		100	-55 to 400	6"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	6	Red/White	0000000	0000000


		100	-55 to 400	12"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	6	Red/White	0000000	000000
		100	-55 to 400	18"	1/4"	±0.12%	10	1/2	316 Stainless Steel	3"	24	6	Red/White	0000000	000000

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