Bearing RTD and Thermocouple Sensors

Bearing Sensor Overview

Thermometrics Corporation manufactures a complete line of bearing sensors for rotating machinery.
Bearing RTD and Thermocouple Sensors

Bearing Temperature

The most reliable indicator of bearing condition is the temperature of the metal beneath the shoe.
bearing sensors inside bearing shoe house

Custom Bearing Sensor Designs

Thermometrics specializes in making custom sensors to our customers specification.

class a bearing sensor-bearing rtd-thermocouple

Bearing Sensor Stock

We stock an inventory of components to manufacture bearing sensors which we can provide same day shipping!

bearing sensor case style A

Bearing Sensor Case Style A

Case Style A-
Ø=0.275"
L= 0.250"
bearing sensor case style B top hat with spring

Bearing Sensor Case Style B

Case Style B-
Ø=0.188"
L= 0.250"
bearing sensor case style C

Bearing Sensor Case Style C

Case Style C-
Ø=0.125"
L= 0.300"
bearing sensor case style d

Bearing Sensor Case Style D

Case Style D-
Ø=0.080"
L= 0.300"

bearing rtd 2 wire

Bearing RTD 2-wire

2 wire rtd (±0.12% at 0°C)

bearing rtd 3 wire

Bearing RTD 3-wire

3 wire rtd(±0.12% at 0°C)

bearing rtd 4 wire

Bearing RTD 4-wire

4 wire rtd (±0.12% at 0°C)

bearing thermocouple

Bearing Thermocouple Wire

Type- E, J, K, T
Insulated sensing junction

bearing sensor oil seal

Bearing Sensor Wire Seal

Prevents oil from moving up the bearing sensor leads
bearing sensor oil resistant wire

Oil Resistant Wire

Bearing sensor optional oil resistant wire available
bearing sensor 90 degree

90° Bearing Sensor

This 90° design is intended to relieve stress put on the wires by bending them.
miniature bearing sensor screw in

Screw In Free Spin Bearing Sensor

This design screws into a threaded hole and has 360° free spinning leads.

bearing thermocouple temperature sensors

Bearing Sensor Spring and Washer

Optional Bearing Sensor spring and star washer.
Bearing Sensor Installation Case A

Bearing Sensor Installation

Install Case Style A sensor just below the babbitt layer, then puddle the babbitt metal over the sensor tip and smooth.
Bearing Sensor Top Hat Install

Bearing Sensor Installation

The Top Hat Spring Style retaining ring allows spring loading with the spring and retaining clip. Slide the spring and ring over the leads, insert the sensor tip into a milled hole, and push down on the retaining ring to compress the spring and secure the sensor.
Screw In Thermocouple

Bearing Sensor Installation

Bond with epoxy inside bearing shoe. Locate near the babbitt face for most accurate readings.

Bearing RTD



Bearing RTDs are designed for areas where there are space limitations. They are small, compact and are often used to detect temperature increases in bearings, thrust bearing plates, shafts and motor windings. They are miniature low mass sensors which are fast responding. Bearing sensors are manufactured using thin film technology and by design are tip sensitive and vibration resistant. They can be spring loaded into a bearing housing or held in position with a high temperature epoxy resin.


Bearing Sensor-RTD-Thermocouple

Bearing RTD Applications


  • Motor windings
  • Bearings
  • Shafts
  • Thrust plates
  • Applications where there is a space limitation

    • Bearing RTD Attributes

  • Tip sensitive thin film technology.
  • Fast responding to sudden temperature changes.
  • Miniature design. Sizes from 0.125 inch in diameter and 0.30 in length.
  • Designed for temperatures to -50 to 260°C (-58 to 500°F)
  • Teflon single or double insulated lead wire.
  • Optional wear resistant stainless steel braided jacket.
  • Available with spring loaded mounting and retaining thrust washer.
  • A variety of tip dimensions available to suit a particular application.
  • Vibration proof solid design with no moving parts.
  • Element encapsulation using high temperature epoxy resin.
  • Moisture proof design.

    • Bearing RTD Specifics


  • Sensor Element:    Platinum 100Ω  ±0.12% at 0°C
  • Measuring Range:    -50 to 260°C (-58 to 500°F)
  • Case Material:    Tin plated copper alloy and Stainless Steel
  • Wiring Configuration:    2, 3, and 4 wire (single)   2 or 3 wire (dual)
  • Accuracy Range:    Class B to DIN EN 60751    Class A to DIN EN 60751
  • Tip Construction:    Tip sensitive
  • Termination:    Stranded copper with PTFE insulation; stainless steel overbraid optional (one sleeve covers all leads).
  • Time Constant:    3.0 seconds(case style A) to 1.5 seconds(case style D), typical value in moving water.
  • Insulation Resistance:    10 megohms min. at 100 VDC, leads to case.
  • Options:    Calibration- single point or multiple points


    • Bearing RTD Sensor Template

    Bearing Thermocouple



    Bearing Thermocouples are designed for areas where there are space limitations. They are small, compact and are often used to detect temperature increases in bearings, thrust bearing plates, shafts and motor windings. They are miniature low mass sensors which are fast responding. Bearing sensors are manufactured using thin film technology and by design are tip sensitive and vibration resistant. They can be spring loaded into a bearing housing or held in position with a high temperature epoxy resin.


    Bearing Sensor-Thermocouple-RTD

    Bearing Thermocouple Applications


  • Motor windings
  • Bearings
  • Shafts
  • Thrust plates
  • Applications where there is a space limitation

    • Bearing Thermocouple Attributes

  • Tip sensitive thin film technology.
  • Fast responding to sudden temperature changes.
  • Miniature design. Sizes from 0.125 inch in diameter and 0.30 in length.
  • Designed for temperatures to -50 to 260°C (-58 to 500°F)
  • Teflon single or double insulated lead wire.
  • Optional wear resistant stainless steel braided jacket.
  • Available with spring loaded mounting and retaining thrust washer.
  • A variety of tip dimensions available to suit a particular application.
  • Vibration proof solid design with no moving parts.
  • Element encapsulation using high temperature epoxy resin.
  • Moisture proof design.

    • Bearing Thermocouple Specifics


  • Thermocouple Type:    J,  K,  T,  E
  • Measuring Range:    -50 to 260°C (-58 to 500°F)
  • Case Material:    Tin plated copper alloy and Stainless Steel
  • Wiring Configuration:    2, 3, and 4 wire (single)   2 or 3 wire (dual)
  • Accuracy Range:    Class B to DIN EN 60751    Class A to DIN EN 60751
  • Tip Construction:    Tip sensitive
  • Termination:    Stranded copper with PTFE insulation; stainless steel overbraid optional (one sleeve covers all leads).
  • Time Constant:    3.0 seconds(case style A) to 1.5 seconds(case style D), typical value in moving water.
  • Insulation Resistance:    10 megohms min. at 100 VDC, leads to case.
  • Options:    Calibration- single point or multiple points


    • Bearing Thermocouple Sensor Template

  • Read more
  • Video

    • Bearing Sensor Custom Designs




    Thermometrics Corporation is dedicated to the continual improvement and development of our products. Our Engineering team's capabilities, knowledge, experience and on-site process evaluations provide you with support and the best possible temperature measurement results. If you are looking for prototypes that require special machined components, you can count on us to deliver them in a timely manner. Our in-house machine shop - complete with metal cutting, threading, shaping and finishing machinery, and stocked with a variety of raw material - compliments our Engineering, Design, and Production teams to manufacture sensors with special component parts.

    Bearing Sensor RTD, Thermocouple, Tempreature Bearing Sensor RTD Thermocouple in Bearing Sleeve

    Bearing Sensor 90 Degree design Bearing Sensor Screw In Design With Overbraid Bearing Sensor 90 Degree design bearing sensor rtd mini screw in bearing sensor screw in with top hat and spring screw in bearing sensor rtd thermocouple top hat

    Bearing Stock




    Coming Soon..

    Bearing Sensor Order Form




    Avoid costly plant shut downs with our express manufacturing service. We stock an inventory of components to manufacture babbit bearing sensors for high and moderate temperature service. Top hat, small profile bearing cap, and double oil seal configurations are routinely assembled with Nickel 120 ohm, Pt. 100 ohm and thermocouples. With over 45 years experience and a manufacturing facility on the West Coast, the days of waiting a week or two for delivery of critically needed embedded sensors are Over!

    Type T Thermocouple

    When protected by compacted mineral insulation and appropriate outer sheath, Type T is usable from 0 to 350°C, (32 to 662°F). Type T is very stable and is used in a wide variety of cryogenic and low temperature applications. For applications below 0°C, (32°F) special selection of alloys are usually required.

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    bearing temperature

    Bearing Temperature

    Condition monitoring has proven important in the installation and maintenance of all types of turbo machinery. Bearing temperature is primarily important because bearings are the critical links between the rotating and stationary components in a machine. If temperatures are taken in the correct location, then Babbitt metal temperatures can be the best indicators of a bearing's operating condition.

    bearing failure causes

    Causes Of Bearing Failure

    Most bearing failures such as flaking and pitting, spalling, unusual wear patterns, rust and corrosion, creeping, skewing and others are usually attributed to a relatively small group of causes that are often interrelated and correctable. These causes include lubrication, mounting, operational stress and bearing selection and environmental influence.

    wind turbine failure

    Don't Let This Happen To You

    A bearing failure will not only mean a compressor shutdown; it could also result in secondary or peripheral damage to costly internal parts. Early detection of a bearing failure may only result in an outage lasting a few days, but an undetected failure, causing major internal damage, can force an outage for weeks or months.

    bearing sensor for rotating machinery

    Power Plant Bearing Reliability

    Babbitt bearings, frequently found in large steam turbines and generators in major power plants, can provide years of service if properly maintained. By using state-of-the-art technology and repair practices, aftermarket suppliers who specialize in Babbitt bearings can repair equipment and increase the life of Babbitt bearings..

    Thrust Bearings

    Thrust bearings offerings include fixed profile designs for lightly-loaded applications and advanced tilting pad solutions for more demanding, high-load, high-speed applications. Combination thrust/journal designs are also available for applications with limited axial space.

    Tilting pad thrust bearings are specially engineered for reduced power loss, oil flow and pad temperatures...for the most reliable and efficient machine performance.

    Hydrodynamic Fixed or Tilting-Pad Journal Bearings

    High-powered industrial machinery utilizes lubricated journal bearings as rotor supports.

    These are designed and manufactured in many sizes and styles of hydrodynamic journal bearings. Properly installed and maintained, hydrodynamic journal bearings can operate indefinitely.

    Hydrodynamic journal bearings are available in fixed profile styles or tilting pad designs, and operate with flooded lubrication or directed lubrication systems. Hydrodynamic journal technology is utilized in high-speed turbine bearing, generator, pump, compressor and gear drive applications for power generation, oil and gas, and general industry.

    Roller Bearings

    Messinger precision roller bearings are ideal for applications requiring high axial load-carrying capacity. This bearing style is available in single-acting, double-acting, self-aligning, combination, and cross roller types. They are manufactured in a range of sizes for markets as diverse as aircraft, construction, agriculture, machine tool, and general industry.

    Bearing Suppliers and Repair Houses

    Click below for a list of bearing suppliers and bearing repair houses.