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Industrial RTD Probe with Aluminum Protection Head


Item# PR-18E-3-100-1/4-4

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $141.11
5-9 $134.05
10-24 $131.23
25-49 $125.59
50-99 $122.77
100+ $119.94

In stock

Lead Time (If not in stock): 7 weeks
Industrial RTD Probe with Aluminum Protection Head PR-18E-3-100-1/4-4 PR-18E-3-100-1/4-4
  • Standard Size Aluminum protection head
  • Class A accuracy conforming to IEC 60751
  • Low temperature range: -50 to 250°C (-58 to 482°F)
  • High temperature range: -50 to 450°C (-58 to 842°F)

PR-18E-3-100-1/4-4 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination or click the CONFIGURE button to build your own.

Process Temperature Range
Probe Length
Additional Feature
Sensor Application
Process Connection Size
Nominal Output
Number of Wires
Sheath Material
Probe Diameter
Termination Connection Type

  • Accuracy Class A from -100°C to 450°C (-148 to 842°F); Class B otherwise, per IEC 60753
  • Cold-End Max Temperature Low (L), 100°C (212°F); High (H) and Extreme (E), 250°C (482°F)
  • Dimensions Standard diameters of 1/8”, 3/16”, and 1/4” ; variable lengths
  • Ingress Protection IP67 (with exception of “High” (10H) type)
  • Nominal Resistance Curve Choice of PT100Ω or PT1000Ω
  • Process Temperature Range -200 to 600°C (-328 to 1112°F)
  • Protection head Aluminum
  • Wire Length / Terminations Screw Terminal

Omega's PR-18 series probe with standard aluminum protection head with flip-top includes PT100 Ω platinum RTD element or PT1000 RTD element and 1/2" NPT mounting threads. The sheath is made of 316 stainless steel. These probes can be used alone, or can be placed directly into a thermowell. The spring load option should not be ordered unless a thermowell is used. All probes include a screw terminal block for easy connection of insulated copper extension wire. Replacement probes (without protection head assembly) are available as well as a "spring-loading" option which allows for the probe to bottom out in a thermowell for quicker and more accurate response. This probe can be used in tanks, vessels, and large pipes for measurement of flow material.

Inside dimensions for the aluminum head: Diameter: 2.3 inches; Height: 2.2 inches.

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Rated 5 out of 5 by from Greats Everything good. Thanks My customer was very excited
Date published: 2016-11-21
Rated 5 out of 5 by from Dual RTD Probes with protection heads with sealtit Omega is top notch with quality customer service and great products
Date published: 2024-04-27
Rated 5 out of 5 by from Great Service perfect part as described, good packaging, quick shipment !!
Date published: 2024-01-18
Rated 5 out of 5 by from Happy with the purchase. Delivery was as expected and communication with the representative was good.
Date published: 2024-01-02
Rated 5 out of 5 by from Nice product, quick receipt. Product arrived in short order and is effective in the application.
Date published: 2023-09-15
Rated 5 out of 5 by from RTD order Omega’s website configurations are great. The RTDs work well.
Date published: 2023-04-14
Rated 5 out of 5 by from Thermocouple Excellent instruments with a fine finish, easy to install
Date published: 2023-03-01
Rated 5 out of 5 by from Great Product at a reasonable price The probe works as it should. It also made it here a lot sooner than expected, so that was a huge plus.
Date published: 2022-10-27
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What is the recommended thermowell for this unit?

Asked by: Sparky Dawg
Thank you for your inquiry. We believe the best assistance would come from speaking to us directly at 888-826-6342 ask for the Temperature Department Mon. – Fri. (HOURS 8:30AM - 5:30PM EST).
Answered by: Application Engineer CB
Date published: 2024-05-14

Are the heads on these RTDs suitable for DIN Form B transmitter mounting? Aka, can you mount a hockey-puck transmitter inside of them?

Asked by: SKahle89
Hello and thank you for this question. Yes, you may use hockey-puck transmitters within the heads of these RTDs. The TX-12 is a perfect example of a transmitter that will fit and can be found though this link here
Answered by: AEMO
Date published: 2020-05-15

What is the replacement RTD probe for this model if it is discontinued?

Asked by: ElectricParts
Thank you for your inquiry ElectricParts. The replacement probe for PR-18-2-100-1/4-6-E would be PR-18E-3-100-1/4-6. Here is the link:
Answered by: Application Engineer SP
Date published: 2022-01-27

Have a PR-18H-3-100-1/4-6 RTD probe with alum head. The termination head assembly sticks out too far. Is there a smaller head that can be assembled to the 1/2" NPT probe or a similar probe that I can interchange that has smaller head and 3/8 NPT thread?

Asked by: Anonymous
Thank you for your inquiry. A smaller head that would be compatible with the PR-18H-3-100-1/4-6 RTD probe would be the NB2-2 head which is the miniature version of the one you currently have. Unfortunately, we do not offer the 3/8 NPT thread.
Answered by: Application Engineer SP
Date published: 2021-12-03
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