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Bolt-On RTD Sensor with Aluminum Flag Housing

120 in Fiberglass leads, Hi Temp, #3, #4 hole


Item# RTD-831-120-MTP-HT

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $184.15
5-9 $174.94
10-14 $171.26
15-24 $163.89
25-99 $160.21
100+ $156.53

In stock

Lead Time (If not in stock): 4 weeks
120 in Fiberglass leads, Hi Temp, #3, #4 hole RTD-831-120-MTP-HT RTD-831-120-MTP-HT
  • Updated housing design for improved strain relief
  • Standard hole for #3 and #4 screw. Options available for #5, #6, #8 screw
  • Small aluminum housing allows for installation on most flat surfaces
  • Sensor can be bolted or cemented into place
  • Class A or Class B RTD element conforming to IEC 60751
  • Temp range -60 to 230°C (-76 to 446°F), or -60 to 450°C (-76 to 842°F) -HT version
  • Resistance value: PT100 Ω or PT1000 Ω
  • Connection options: mini 3-pin connector, standard 3-pin connector, stripped ends, and spade lugs

RTD-831-120-MTP-HT Model Options

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Process Temperature Range
Nominal Resistance
Cable Insulation
Termination Connection Type
Cable Length
Additional Features
Sensor Application
Number of Wires

  • Accuracy Class "A" conforming to IEC 60751
  • Dimensions Barrel, 0.562” by 0.190”; Flag (mounting body portion), 0.31" by 0.31"
  • Mounting Type Bolt-on or Cement-on
  • Nominal Resistance Curve Choice of PT100Ω or PT1000Ω
  • Process Temperature Range -60 to 230°C (-76 to 446°F), standard unit or -60 to 450°C (-76 to 842°F), high temperature unit (-"HT")
  • Wire Length / Terminations 1 m standard. Other lengths available

Omega's RTD-831 series 3-wire RTD sensor features an improved barrel and flag design on the aluminum housing which gives improved durability. The flag is machined to accept a #3, #4, #5, #6, #8 screw for easy installation on flat surfaces by either being bolted or cemented onto the surface. This is available in 100 Ω or 1000 Ω Platinum RTD element and is available in a high temperature (-HT) version. Connection options available are miniature 3-pin connector (-MTP), standard 3-pin connector (-OTP), stripped ends (-SE), and spade lugs (-LUG). For other connector types, please contact Sales. Applications for this type of sensor include product performance testing climate control/HVAC monitoring and control of processes hot plate equipment, and process pipes.

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The picture of this part and the drawing do not match. They are mirror images of each other. Can post pictures of the actual product? With the cable pointing to the left, I would like to know if the mounting hole is above or below the cylinder. Thanks

Asked by: DSMKS
Please direct you question to temp@omega.com so your question can be fully investigated by an application Engineer.
Answered by: Applications Engineer AB
Date published: 2022-03-21

What are the wire colors and connections for the RTD-831-SE sensor?

Asked by: Sechan Engineer
Thank you for your inquiry Sechan Engineer. The RTD-831-SE sensor has Red/Black/Black wires.
Answered by: Application Engineer SP
Date published: 2023-02-24

Can RTD-831 series be used in Vacuum chamber like RTD-830 series? Thanks.

Asked by: Anonymous
Hi Anonymous, If used in vacuum there may be some outgassing from the epoxy used in construction; so we have no vacuum recommendation for this product; You would need to purchase and evaluate to see if would be acceptable. This has the same construction as the RTD-830. The new washer shape provides for stronger lead wire connection. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2021-11-01

What holds the element inside the aluminum flag? Is the element fully encapsulated with black epoxy material?

Asked by: WVATS
Thank you for your inquiry WVATS. That's correct epoxy is used as part of the construction of the sensor tip.
Answered by: Application Engineer MC
Date published: 2022-11-24

For RDT-831-SE, what wire gauge is used for the lead wires?

Asked by: AS603mfg
Thank you for your inquiry. RTD-831-SE uses 26 awg stranded wire.
Answered by: Application Engineer SP
Date published: 2022-12-15
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