About Selecting Temperature Sensors
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Threaded RTD Probes for Liquids and Gases
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.
Fixed probes can be used directly in liquid or steam because they’re welded to their fitting for a liquid-tight seal.
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 | Probe Connection | Wire | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RTD Type | Temperature Range, °F | Lg. | Dia. | Accuracy | Response Time, sec. | Connection Type | Pipe Size  | Thread Type | Gender | Fitting Material | Lead Lg. | Gauge | No. of Wires | Wire Color | Each | |
Fixed 304 Stainless Steel Probe | ||||||||||||||||
| 100 ohms | -55° to 400° | 3" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 000000 |
| 100 ohms | -55° to 400° | 4 1/2" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 00000 |
| 100 ohms | -55° to 400° | 6" | 1/4" | ±0.12% | 3.5 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 00000 |
| 100 ohms | -55° to 400° | 6 5/8" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 000000 |
| 100 ohms | -55° to 400° | 12" | 1/4" | ±0.12% | 3.5 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 00000 |
| 100 ohms | -55° to 400° | 12 5/8" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 000000 |
| 100 ohms | -55° to 400° | 18" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 00000 |
| 100 ohms | -55° to 400° | 24" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 00000 |
| 100 ohms | -55° to 400° | 36" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 00000 |
Fixed 316 Stainless Steel Probe | ||||||||||||||||
| 100 ohms | -55° to 1200° | 6" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 000000 |
Spring-Loaded 304 Stainless Steel Probe | ||||||||||||||||
| 100 ohms | -55° to 400° | 6" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 304 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 00000 |
| 100 ohms | -55° to 400° | 12" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 304 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 00000 |
| 100 ohms | -55° to 400° | 18" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 304 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 00000 |
| 100 ohms | -55° to 400° | 24" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 304 Stainless Steel | 3" | 24 | 3 | Red/White | 0000000 | 00000 |
Dual-Output Threaded RTD Probes for Liquids and Gases
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.
Probe | Probe Connection | Wire | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RTD Type | Temperature Range, °F | Lg. | Dia. | Accuracy | Response Time, sec. | Connection Type | Pipe Size | Thread Type | Gender | Fitting Material | Lead Lg. | Gauge | No. of Wires | Wire Color | Each | |
304 Stainless Steel Probe | ||||||||||||||||
| 100 ohms | -55° to 400° | 6" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 6 | Red/White | 0000000 | 0000000 |
| 100 ohms | -55° to 400° | 12" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 6 | Red/White | 0000000 | 000000 |
| 100 ohms | -55° to 400° | 18" | 1/4" | ±0.12% | 10 | Wire Leads | 1/2 | NPT | Male | 316 Stainless Steel | 3" | 24 | 6 | Red/White | 0000000 | 000000 |
Threaded RTD Probe Transmitters for Liquids and Gases
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.
RTDs with a screw terminal connection have a cap you can remove to wire the RTD’s terminal block to your application.
Fixed RTDs can be used directly in liquid or steam because they’re welded to their fitting for a liquid-tight seal.
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 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 DIN EN 60751 Class A standards for temperature accuracy. UL and C-UL listed, they meet American and Canadian safety standards.
For technical drawings and 3-D models, click on a part number.
Probe | Probe Connection | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RTD Type | Lg. | Dia. | Accuracy | Pipe Size | Thread Type | Gender | DC Voltage | Max. Pressure, psi | Output Current | Overall Lg. | Fitting Material | Choose a Temperature Range | Each | |
Fixed 316 Stainless Steel Probe with Plastic Head (IP65) | ||||||||||||||
| 100 ohms | 1 3/4" | 1/4" | ±0.5% | 1/2 | NPT | Male | 10-30 | 725 | 4-20mA | 5 3/4" | 316 Stainless Steel | 000000 | 0000000 | |
| 100 ohms | 3 1/4" | 1/4" | ±0.5% | 1/2 | NPT | Male | 10-30 | 725 | 4-20mA | 7 1/4" | 316 Stainless Steel | 000000 | 000000 | |
| 100 ohms | 5 1/4" | 1/4" | ±0.5% | 1/2 | NPT | Male | 10-30 | 725 | 4-20mA | 9 1/4" | 316 Stainless Steel | 000000 | 000000 | |
| 100 ohms | 8 1/4" | 1/4" | ±0.5% | 1/2 | NPT | Male | 10-30 | 725 | 4-20mA | 12 1/4" | 316 Stainless Steel | 000000 | 000000 | |
| 100 ohms | 11 1/4" | 1/4" | ±0.5% | 1/2 | NPT | Male | 10-30 | 725 | 4-20mA | 15 1/4" | 316 Stainless Steel | 0000000 | 000000 | |
Probe Transmitters | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Probe | Probe Connection | Cables with Socket | ||||||||||||||||
| RTD Type | Lg. | Dia. | Accuracy | Response Time, sec. | Pipe Size | Thread Type | Gender | DC Voltage | Max. Pressure, psi | Output Current | Communication Protocol | Overall Lg. | Fitting Material | Temp. Range, °F | Each | Each | ||
Fixed 316L Stainless Steel Probe (IP67, IP68, IP69K) | ||||||||||||||||||
| 1,000 ohms | 11/16" | 1/4" | ±0.5% | 3 | 1/2 | NPT | Male | 18-32 | 5,800 | 4-20mA | IO Link | 4 1/8" | 316L Stainless Steel | 0° to 300° | 0000000 | 0000000 | 0000000 | 000000 |
| 1,000 ohms | 1 1/2" | 1/4" | ±0.5% | 3 | 1/2 | NPT | Male | 18-32 | 4,350 | 4-20mA | IO Link | 5" | 316L Stainless Steel | 0° to 300° | 0000000 | 000000 | 0000000 | 00000 |
| 1,000 ohms | 3 1/2" | 1/4" | ±0.5% | 3 | 1/2 | NPT | Male | 18-32 | 4,350 | 4-20mA | IO Link | 7" | 316L Stainless Steel | 0° to 300° | 0000000 | 000000 | 0000000 | 00000 |
| 1,000 ohms | 5 7/16" | 1/4" | ±0.5% | 3 | 1/2 | NPT | Male | 18-32 | 4,350 | 4-20mA | IO Link | 8 7/8" | 316L Stainless Steel | 0° to 300° | 0000000 | 000000 | 0000000 | 00000 |
Probe Transmitters | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Probe | Probe Connection | Conduit Connection | Replacement Elements | |||||||||||||||||
| RTD Type | Lg. | Dia. | Accuracy | Response Time, sec. | Pipe Size | Thread Type | Gender | Pipe Size | Thread Type | Gender | DC Voltage | Max. Pressure | Output Current | Overall Lg. | Fitting Material | Choose a Temperature Range | Each | Each | ||
Spring-Loaded 316 Stainless Steel Probe with Aluminum Head | ||||||||||||||||||||
| 100 ohms | 3 3/4" | 1/4" | ±0.1% | 6 | 1/2 | NPT | Male | 3/4 | NPT | Female | 10-30 | Not Rated | 4-20mA | 9" | 316 Stainless Steel | 0000000 | 0000000 | 00000000 | 0000000 | |
| 100 ohms | 5 3/4" | 1/4" | ±0.1% | 6 | 1/2 | NPT | Male | 3/4 | NPT | Female | 10-30 | Not Rated | 4-20mA | 11" | 316 Stainless Steel | 0000000 | 000000 | 00000000 | 000000 | |
| 100 ohms | 8 3/4" | 1/4" | ±0.1% | 6 | 1/2 | NPT | Male | 3/4 | NPT | Female | 10-30 | Not Rated | 4-20mA | 14" | 316 Stainless Steel | 0000000 | 000000 | 00000000 | 000000 | |
| 100 ohms | 11 3/4" | 1/4" | ±0.1% | 6 | 1/2 | NPT | Male | 3/4 | NPT | Female | 10-30 | Not Rated | 4-20mA | 17" | 316 Stainless Steel | 0000000 | 000000 | 00000000 | 000000 | |
Threaded RTD Probe Transmitters with Digital Display for Liquids and Gases
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 DIN EN 60751 Class A standards for temperature accuracy. UL Listed, C-UL Listed, and CE Marked, all meet American, Canadian, and European safety standards.
For technical drawings and 3-D models, click on a part number.
Probe | Configurable Digital Output | Configurable Analog/Digital Output | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RTD Type | Temp. Range, °F | Lg. | Dia. | Accuracy | Response Time, sec. | Plug Type | Probe Connection Pipe Size | Max. Pressure, psi | No. of | Communication Protocol | Signal Type | No. of | Current | Signal Type | Overall Lg. | Each | |
NPT Male Probe Connection | |||||||||||||||||
316L Stainless Steel Probe with Plastic Head (IP67) | |||||||||||||||||
| 1,000 ohms | -55° to 300° | 1/2" | 1/4" | ±0.75% | 3 | 4-Pole Micro M12 | 1/2 | 4,350 | 1 | IO Link | NPN/PNP | 1 | 4-20mA | NPN/PNP | 4 7/8" | 0000000 | 0000000 |
| 1,000 ohms | -55° to 300° | 1 1/4" | 1/4" | ±0.75% | 3 | 4-Pole Micro M12 | 1/2 | 4,350 | 1 | IO Link | NPN/PNP | 1 | 4-20mA | NPN/PNP | 5 5/8" | 0000000 | 000000 |
| 1,000 ohms | -55° to 300° | 3 1/4" | 1/4" | ±0.75% | 3 | 4-Pole Micro M12 | 1/2 | 3,625 | 1 | IO Link | NPN/PNP | 1 | 4-20mA | NPN/PNP | 7 5/8" | 0000000 | 000000 |
| 1,000 ohms | -55° to 300° | 5 3/16" | 1/4" | ±0.75% | 3 | 4-Pole Micro M12 | 1/2 | 3,625 | 1 | IO Link | NPN/PNP | 1 | 4-20mA | NPN/PNP | 9 1/2" | 0000000 | 000000 |
| Cable Lead Lg., ft. | Voltage | Current | Face Diameter | Each | |
| 12 | 250V AC/250V DC | 4A | 0.3" | 0000000 | 000000 |
Thermocouple and RTD Connection Heads
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 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 | Environmental Rating | Each | |
Aluminum | ||||||||||
| 1/2 | NPT | Female | 3/4 | NPT | Female | Screw-On Cap with Retaining Chain | __ | __ | 00000000 | 000000 |
| 1/2 | NPT | Female | 3/4 | NPT | Female | Screw-On Cap with Retaining Chain | Hazardous Location | 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 | 000000 |
Cast Iron | ||||||||||
| 1/2 | NPT | Female | 3/4 | NPT | Female | Screw-On Cap with Retaining Chain | __ | __ | 00000000 | 00000 |
Plastic | ||||||||||
| 1/2 | NPT | Female | 3/4 | NPT | Female | Hinged Cap | __ | __ | 00000000 | 00000 |
| 1/2 | NPT | Female | 3/4 | NPT | Female | Screw-On Cap with Retaining Chain | __ | __ | 00000000 | 00000 |
Stainless Steel | ||||||||||
| 1/2 | NPT | Female | 3/4 | NPT | Female | Screw-On Cap with Retaining Chain | __ | __ | 00000000 | 000000 |
| 1/2 | NPT | Female | 3/4 | NPT | Female | Screw-On Cap with Retaining Chain | Hazardous Location | 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 IP66 | 00000000 | 000000 |