About Selecting Temperature Sensors
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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.
Fixed RTDs can be used directly in liquid or steam because they’re welded to their fitting for a liquid-tight seal.
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 | |
Sanitary RTD Probe Transmitters with Digital Display for Liquids and Gases
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 touch screen, 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 DIN EN 60751, an industry standard for accuracy. They’re also CE marked, meaning they meet European Union safety standards.
For technical drawings and 3-D models, click on a part number.
Probe | Probe Transmitters | Cables with Socket | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RTD Type | Temperature Range, °F | Lg. | Dia. | Flange OD | Accuracy | Response Time, sec. | Plug Type | DC Voltage | Max. Pressure, psi | Output Current | Overall Lg. | Each | Each | ||
316L Stainless Steel Probe with 304 Stainless Steel Head (IP69K) | |||||||||||||||
For 1 1/2" Tube OD | |||||||||||||||
| 100 ohms | -55° to 480° | 2" | 5/16" | 1.988" | ±0.1% | 25 | 5-Pole Micro M12 | 8-35 | 580 | 4-20mA | 6 3/4" | 0000000 | 0000000 | 0000000 | 000000 |
Threaded RTD Probes with Thermowell for Liquids and Gases
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.
Probe | Thermowell Connection | Conduit Connection | Material | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RTD Type | Temperature Range, °F | Lg. | Dia. | Accuracy | Response Time, sec. | Connection Type | Pipe Size | Thread Type | Gender | Pipe Size | Thread Type | Gender | Overall Lg. | Head | Fitting | Each | |
304 Stainless Steel Probe and Thermowell | |||||||||||||||||
| 100 ohms | -55° to 400° | 6" | 1/2" | ±0.12% | 30 | Screw Terminal | 3/4 | NPT | Male | 3/4 | NPT | Female | 14 1/8" | Cast Iron | Iron | 0000000 | 0000000 |
| 100 ohms | -55° to 400° | 9" | 1/2" | ±0.12% | 30 | Screw Terminal | 3/4 | NPT | Male | 3/4 | NPT | Female | 17 1/8" | Cast Iron | Iron | 0000000 | 000000 |
| 100 ohms | -55° to 400° | 12" | 1/2" | ±0.12% | 30 | Screw Terminal | 3/4 | NPT | Male | 3/4 | NPT | Female | 20 1/8" | Cast Iron | Iron | 0000000 | 000000 |
RTD Transmitters
Convert signals from your RTD probe into signal types that data loggers, controllers, and other instruments can read.
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).
For technical drawings and 3-D models, click on a part number.
| For RTD Probe Type | Temperature Range, °F | Dia. | Dp. | DC Voltage | Output Current | Output Voltage | Communication Protocol | Housing Material | Environmental Rating | Each | |
4-Pole Micro M12 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 100 ohms/1,000 ohms | -55° to 300° | 3/4" | 2" | 20-32 | 4-20mA | __ | IO Link | Plastic | IP67 | 00000000 | 0000000 |
| 100 ohms/1,000 ohms | 32° to 212° | 3/4" | 2" | 20-32 | 4-20mA | __ | IO Link | Plastic | IP67 | 00000000 | 000000 |
| 100 ohms/1,000 ohms | 32° to 212° | 3/4" | 2" | 18-32 | __ | 0-10V DC | IO Link | Plastic | IP67 | 00000000 | 000000 |