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Industrial RTD (PT100) Probes with Cast Iron Protection Head

RTD Probe with Cast Iron Protection Head


Item# PR-12E-3-100-1/4-2

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $147.86
5-9 $140.47
10-24 $137.51
25-49 $131.60
50-99 $128.64
100+ $125.68

In stock

Lead Time (If not in stock): 7 weeks
RTD Probe with Cast Iron Protection Head PR-12E-3-100-1/4-2 PR-12E-3-100-1/4-2
  • Low temperature range: -50 to 250°C (-58 to 482°F)
  • High temperature range: -50 to 450°C (-58 to 842°F)
  • Extreme temperature range: -200 to 600°C (-328 to 1112°F)
  • Corrosion-resistant cast iron protection head

PR-12E-3-100-1/4-2 Model Options

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

  • Accuracy Class A from -100°C to 450°C (-148 to 842°F); Class B otherwise, per IEC 60751
  • 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 Cast Iron
  • Wire Length / Terminations Screw Terminal

Our PR-12 series probe with chemical-resistant cast iron protection head and screw-on cap includes PT100 Ω platinum RTD element or PT1000 RTD element, 1/2" NPT mounting threads and sheath of 316 stainless steel. When properly sized, these can go directly into and bottom out in a thermowell. All probes include a screw terminal block for easy connection of insulated copper extension wire. Replacement probes (without 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. Inside dimensions for the cast iron head: Diameter: 2.2 inches; Height: 2.0 inches

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Rated 5 out of 5 by from Good Quality Good quality. As advertised. Will work for our needed application.
Date published: 2023-05-31
Rated 5 out of 5 by from Great product at a great price! Received product faster than expected. Product does what is expected.
Date published: 2022-10-27
Rated 5 out of 5 by from Assembly for Client- Food Processing Parts for an assembly are shipped in a timely manner. Our client enjoys the ease of one part on their shelf as a storeroom item.
Date published: 2022-01-20
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Need a wiring diagram for this PR-12E-3-100-1/4-6.

Asked by: Eddy B
There isn't a wire diagram to send so the best thing is to call the Temperature group at 800-872-9436 and have an Engineer explain the connections.
Answered by: ApplicationsEngineerANB
Date published: 2024-03-25

What are the dimensions of the cast iron RTD head?

Asked by: bzachry
Hi bzachry, Thank you for the inquiry. For details on the protection head; Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2022-06-21

Is the spring-loaded RTD sealed from the process or is a thermowell required to prevent leaking into the cast iron head? PR-12-2-100-1/4-12-E-SL-DUAL

Asked by: RTDsAreMyFavorite
Thank you for your inquiry. Spring-loaded probes are not sealed and would require a thermowell to seal probe to the process.
Answered by: Application Engineer JB
Date published: 2021-09-15

Are the protection heads certified for any hazardous environments, say Class 1 Div 2. Where can I find information on the heads such as UL Listing?

Asked by: Tom S
Hi Tom S, Thank you for the inquiry. We do not offer assembly rated Class 1 Div 2. For questions on the head alone please forward request to TEMP@OMEGA.COM. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2023-10-07

is this RTD are 2-wire or 3-wire?

Asked by: ankur
Thank you for your inquiry. The PR-12 series RTD is available with either 3 wire or a 4 wire configuration.
Answered by: Application Engineer SP
Date published: 2023-08-01

Good day, what is the max operating pressure ?

Asked by: JHax
Hi JHax, Thank you for the inquiry. We do not provide a pressure rating this probe series due to the temperatures they may be exposed to. For pressurized applications please consider use of thermowell. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2024-07-05
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