Skip to Main Content
  • Instrumart
Instrumart logo
  • Products
  • Brands
  • Applications
  • Lab
  • Blog
  • Account
  • Email Us
  • 1-800-884-4967
  • What can we help you find?

    Can’t find what you’re looking for? Contact one of our engineers today. We’re open 8:00 am to 5:30 pm ET.
    • 1-800-884-4967
    • Email Us
    • Live Chat
  1. Thermocouples

Watlow AT Style Mineral Insulated Thermocouple with Thermowell

Designed for use with thermowells for process petrochemical and power applications.

Watlow AT Style Mineral Insulated Thermocouple with Thermowell
Watlow Mineral Insulated Thermowells Style AT Thermocouple
  • Watlow Mineral Insulated Thermowells Style AT Thermocouple
    Watlow Mineral Insulated Thermowells Style AT Thermocouple
  • Watlow Mineral Insulated Thermowells Style AT Thermocouple
    Watlow Mineral Insulated Thermowells Style AT Thermocouple
  • Watlow Mineral Insulated Thermowells Style AT Thermocouple
    Watlow Mineral Insulated Thermowells Style AT Thermocouple
Watlow AT Style Mineral Insulated Thermocouple with Thermowell
Watlow Mineral Insulated Thermowells Style AT Thermocouple
Watlow AT Style Mineral Insulated Thermocouple with Thermowell
Watlow Mineral Insulated Thermowells Style AT Thermocouple
Watlow AT Style Mineral Insulated Thermocouple with Thermowell
Watlow Mineral Insulated Thermowells Style AT Thermocouple
Retired products cannot be ordered
The Watlow AT Style Mineral Insulated Thermocouple For Use with Thermowells is the replacement

View Company Reviewsby Trustpilot
Manufactured
  • By Watlow
  • Made in the USA
Includes
  • FREE Ground Shipping on orders of $1,000 or more
  • FREE Lifetime Tech Support
Questions?
Call 1-800-884-4967 or Email Us.
Open 8:00 am to 5:30 pm ET.
Trustpilot

Overview

Features

  • Special mineral insulation protects thermocouple form moisture and thermal shock
  • Permits operation in high termperature and pressure environments
  • Small diameters are ideal when physical space or extremely fast response are critical
  • Flexible NACTPAK material allows forming and bending of the thermocouple
  • Outer sheath protects wires from oxidation and hostile environments
  • Wide range of sheath materials, diameters and calibrations to meet specific requirements

Description

The Watlow AT style mineral insulated thermocouple with thermowells feature high-quality Watlow sensors with 316 SS straight or tapered thermowells, nipple-union-nipple, 0.250 inch diameter spring loaded element, small aluminum connection heads, and ungrounded junction.

Watlow Mineral Insulated Thermocouples

Watlow mineral insulated thermocouples are fast-responding, durable, and capable of handling higher temperatures.

Watlow mineral insulated thermocouples are manufactured with XACTPAK®, Watlow's trademark for metal-sheathed, mineral insulated (MI) thermocouple material. XACTPAK responds fast because the protective metal outer sheath allows the use of smaller diameter thermocouple conductors. The rock hard compacted MgO insulation further enhances the sensor's ability to "read" temperature by transferring heat quickly to the measuring junction.

The XACTPAK protecting sheath and compacted insulation outperforms bare wire thermocouples in most applications.

Applications for the Watlow AT Style Mineral Insulated Thermocouple with Thermowell

  • Heat treating
  • Furnaces/kilns
  • Turbines
  • Bearing temperature
  • Power stations
  • Steam generators
  • Diesel engines
  • Nuclear reactors
  • Atomic research
  • Jet engines and test cells
  • Rocket engines
  • Semiconductor manufacturing
  • Refineries/oil processing
  • Catalytic reformers
  • Food Processing

Documents

Documents

  • Watlow AT Style Mineral Insulated Thermocouple with Thermowell Data Sheet PDF (161 KB)
  • All possible part numbers

Accessories

Watlow SERV-RITE Thermocouple Wire
Watlow SERV-RITE Thermocouple Wire

Premium performance and reliability, Insulation temperature ranges from -328 to 2600°F (-200 to 1427°C).

Starting at $129.00
Watlow Explosion Proof Thermocouple Connection Heads
Watlow Explosion Proof Thermocouple Connection Heads

Starting at $87.85
Watlow SAC-220 Cable Clamps
Watlow SAC-220 Cable Clamps

Cable Clamps for Male or Female Standard Connectors.

$5.35
Watlow MC Series Miniature Thermocouple Connectors
Watlow MC Series Miniature Thermocouple Connectors

Miniature design enables mating with other miniature size thermocouple connectors.

Some Models in Stock
Starting at $6.00
Watlow High Temperature Connectors
Watlow High Temperature Connectors

Starting at $35.45
Watlow PT Polypropylene Head and Connector Blocks
Watlow PT Polypropylene Head and Connector Blocks

Starting at $54.00
Watlow SKP Single Panel Mount Hardware
Watlow SKP Single Panel Mount Hardware

Connectors Single Panel Mount Hardware, 425°F (218°C).

Starting at $27.00
Watlow SC Series Standard Connector
Watlow SC Series Standard Connector

SC Standard Connectors are ASTM color coded and made of Compensated alloys.

Starting at $8.15
Watlow SAB Series Crimp / Braze Connectors
Watlow SAB Series Crimp / Braze Connectors

Starting at $2.78
Watlow Terminal Block for Standard Connection Heads
Watlow Terminal Block for Standard Connection Heads

Starting at $10.75
Watlow Standard Thermocouple Connection Heads
Watlow Standard Thermocouple Connection Heads

Made of cast iron (1/2, 3/4, or 1in NPT) or aluminum (1/2in NPT).

Starting at $54.00
Watlow 50500701 / 50500801 Terminal Blocks for PT Heads
Watlow 50500701 / 50500801 Terminal Blocks for PT Heads

Single or dual elements for the PT Series polypropylene head.

Starting at $13.40

Need Help? Call a Temperature engineer at 1-800-884-4967

We're open 8:00 am to 5:30 pm ET

Luke M. headshot Luke M.
Applications Engineer
6 years at Instrumart
Dwight M. headshot Dwight M.
Senior Applications Engineer
28 years at Instrumart
Rhys D. headshot Rhys D.
Applications Engineer
Ron J. headshot Ron J.
Temperature Engineering Lead
29 years at Instrumart
Alex A. headshot Alex A.
Senior Applications Engineer
19 years at Instrumart
Shawn D. headshot Shawn D.
Senior Applications Engineer
20 years at Instrumart
David S. headshot David S.
Applications Engineer
Luke M. headshot Luke M.
Applications Engineer
6 years at Instrumart
Dwight M. headshot Dwight M.
Senior Applications Engineer
28 years at Instrumart
Rhys D. headshot Rhys D.
Applications Engineer
Ron J. headshot Ron J.
Temperature Engineering Lead
29 years at Instrumart
Alex A. headshot Alex A.
Senior Applications Engineer
19 years at Instrumart
Shawn D. headshot Shawn D.
Senior Applications Engineer
20 years at Instrumart
David S. headshot David S.
Applications Engineer
Luke M. headshot Luke M.
Applications Engineer
6 years at Instrumart
Are you located in New England? Schedule an On-site Visit!

Recently Viewed

Watlow AT Style Mineral Insulated Thermocouple with Thermowell
Watlow AT Style Mineral Insulated Thermocouple with Thermowell
United States Canada Mexico
Shop
Products
Brands
Applications
Support
Customer Service
Ask a Question
Live Chat
Track Order
Fraud Prevention
Financing
Our Company
Blog
About Us
Contact Us
Jobs
Travel Information
Our Team
Privacy Policy
Terms and Conditions of Sale
Terms and Conditions of Purchase
Accessibility Statement
Connect
1-800-884-4967
sales@instrumart.com
Instrumart
35 Green Mountain Dr
S Burlington, VT 05403 US
Mo-Th 8:00am to 5:30pm ET
Fr 8:00am to 5:00pm ET
Join Us on Facebook
Follow Us on X

Instrumart is a member of a family of industrial stores

Instrumart Compressor World Pump World BioPharm World Filtration World Motion World Qualitrol Engineered Solutions Wholesale Air Pipe
© Instrumart 2025

Family of Industrial Stores

Welcome to our family of stores, your go-to source for a wide selection of commercial and industrial products in the flow control and automation sectors. Each store features a curated range of specialized industrial solutions, with many items designed to complement each other, ensuring you can find everything you need for your specific application. Explore the stores below to discover our extensive product offerings for your business needs.

  • Instrumart

    Shop Industrial and Laboratory Instruments.

    Shop Now!
  • Compressor World

    Shop Compressed Air Equipment.

    Shop Now!
  • Pump World

    Shop Industrial, Water, and Waste Water Pumps.

    Shop Now!
  • BioPharm World

    Shop Sanitary Process Solutions and Products.

    Shop Now!
  • Filtration World

    Shop Industrial Filters.

    Shop Now!
  • Motion World

    Shop Motion Control and Process Automation Systems.

    Shop Now!
  • Qualitrol

    Shop Remanufactured or Repair Automation Products.

    Shop Now!
  • Engineered Solutions

    Shop Custom Engineered and Manufactured Systems.

    Shop Now!
  • Wholesale Air Pipe

    Shop Air Piping.

    Shop Now!