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    Not Sure? Try Our Digital Product Assistant

    Take the complexity out of product selection with our innovative Digital Product Assistant. Answer a few application questions and our interactive tool will recommend a product from our catalog.

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    THERMALWATCH™ Intelligent Analytics Solution

    THERMALWATCH leverages our deep understanding of thermal systems to provide secure data integration and management, along with expert analysis, to transform data into valuable information.

    Learn More
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    Watlow SELECT® Visual Designer™

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    Many parts have lead times, dimensional, drawings, and more available on-demand. Click "Request a Quote" on the search result to access.

    Help Me Choose

    man with dual monitors using product selection assistant
    Not Sure? Try Our Digital Product Assistant

    Take the complexity out of product selection with our innovative Digital Product Assistant. Answer a few application questions and our interactive tool will recommend a product from our catalog.

    Launch Assistant
    Still need help? Locate a Rep Contact Us
    Product Documentation

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    Products
    View All

    Electric Heaters
    Cartridge Insertion Heaters Circulation Heaters Immersion Heaters Air Heaters Flexible Heaters Tubular Heaters Gas Delivery and Exhaust Heaters High-Temperature Heaters Specialty Heaters View All
    Temperature & Process Control
    Multi Loop Controllers Single Loop Controllers Indicators and Alarms Limits and Scanners Operator Interfaces
    Power Control
    Power Controllers Power Switches
    Data Management
    Data Recorders
    Panels & Systems
    WATCONNECT® Control Panels POWERSAFE™ Thermal System
    Sensors
    Thermocouples Resistance Temperature Detectors (RTDs) Fiber Optic Sensing
    man with dual monitors using product selection assistant
    Not Sure? Try Our Digital Product Assistant

    Take the complexity out of product selection with our innovative Digital Product Assistant. Answer a few application questions and our interactive tool will recommend a product from our catalog.

    Launch Assistant

    Services

    thermalwatch thumbnail image of laptop with modern analytics dashboard
    THERMALWATCH™ Intelligent Analytics Solution

    THERMALWATCH leverages our deep understanding of thermal systems to provide secure data integration and management, along with expert analysis, to transform data into valuable information.

    Learn More

    Configure a Product

    vd_
    Watlow SELECT® Visual Designer™

    Quickly configure a product to meet the unique requirements of your application. Instantly access lead times, dimensional drawings, and more - at your own pace. No login required.

    Get Started

    Prefer to talk to a human? Find a Distributor or Sales Office 

    Part Lookup

    Know Your Part Number?

    Enter your part number exactly as marked.

    #
    Tip

    Many parts have lead times, dimensional, drawings, and more available on-demand. Click "Request a Quote" on the search result to access.

    Help Me Choose

    man with dual monitors using product selection assistant
    Not Sure? Try Our Digital Product Assistant

    Take the complexity out of product selection with our innovative Digital Product Assistant. Answer a few application questions and our interactive tool will recommend a product from our catalog.

    Launch Assistant
    Still need help? Locate a Rep Contact Us

    Product Documentation

    Watlow Catalogs Specification Sheets User Manuals Software and Demos Brochures
    CAD Drawings Mobile Applications Watlow Patents Certifications & Approvals
    catalog-ebook
    Try Our Interactive Catalogs

    Click Here

  • What We Do

    What We Do

    The Thermal Loop Industry Solutions Electrification Industry 4.0
    The Thermal Loop
    Learn More

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    The Thermal Loop

    For Watlow, the underlying concept behind everything we do is that of the thermal loop. Every product we offer, and every project we work on, is ultimately about the creation and control of a thermal loop in an application. 

    Learn More
    Industries

    Heat Treatment Energy and Environmental Technologies Life Sciences
    Clinical Equipment Semiconductor Processing Foodservice Equipment
    Electrification

    thumbnails of white papers relating to electrification and decarbonization
    Electrification

    Over 100 years ago, Watlow began designing and manufacturing electric heating elements to replace steam in the shoe industry. We've been electrifying equipment and processes ever since. Wherever thermal is critical, no one is better equipped to help you reach your energy transition goals. Learn why leading companies partner with us.

    Learn More
    Industry 4.0

    thumbnail of industry 4.0 white paper on tablet and print
    The Thermal Loop & Industry 4.0

    Industry 4.0 technology enables the capture and processing of data in real time, both where its generated and where it is needed, to implement effective improvements to industrial processes. Capturing data, though, is not enough. The advantage Watlow® brings to an Industry 4.0 project are its thermal experts, who understand both the important role thermal loop systems play in key applications and industry 4.0 implementations.

    Learn More

    The Thermal Loop
    Learn More

    icon representing a thermal loop system
    The Thermal Loop

    For Watlow, the underlying concept behind everything we do is that of the thermal loop. Every product we offer, and every project we work on, is ultimately about the creation and control of a thermal loop in an application. 

    Learn More

    Industries

    Heat Treatment Energy and Environmental Technologies Life Sciences
    Clinical Equipment Semiconductor Processing Foodservice Equipment

    Electrification

    thumbnails of white papers relating to electrification and decarbonization
    Electrification

    Over 100 years ago, Watlow began designing and manufacturing electric heating elements to replace steam in the shoe industry. We've been electrifying equipment and processes ever since. Wherever thermal is critical, no one is better equipped to help you reach your energy transition goals. Learn why leading companies partner with us.

    Learn More

    Industry 4.0

    thumbnail of industry 4.0 white paper on tablet and print
    The Thermal Loop & Industry 4.0

    Industry 4.0 technology enables the capture and processing of data in real time, both where its generated and where it is needed, to implement effective improvements to industrial processes. Capturing data, though, is not enough. The advantage Watlow® brings to an Industry 4.0 project are its thermal experts, who understand both the important role thermal loop systems play in key applications and industry 4.0 implementations.

    Learn More
  • Who We Are

    Who We Are

    About Us Core Values Sustainability News Events & Webinars
    About Us

    We solve the world's toughest and most important thermal problems.


    About Us Leadership Team Company History Watlow Worldwide
    Core Values

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    The Watlow Way

    At Watlow, our lean journey, as well as our core organizational beliefs are aligned with the Watlow Way, a set of core principles, behaviors and values which guides our company and is woven through every decision we make.

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    Sustainability

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    Some of our best work is performed in areas intended to protect and preserve our environment

    We believe protecting the environment is everyone's responsibility and both our products and our own lean manufacturing processes are designed to address these challenges.

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    News

    Find the latest news, press releases and annoucements.


    News
    Shiyi Zhou Joins Watlow® as Regional President for Asia Watlow® Welcomes Klaus Aarestrup as New Regional President of Europe Watlow’s New Large and Extra Large WATCONNECT® Control Panels Maximize Process Uptime with a Small Footprint Watlow’s New PM PLUS® 1/8 DIN PID Controller Watlow® Obtains KGS Certification on Flange and Circulation Heaters Watlow® Completes Acquisition of Eurotherm®
    View All News 
    Events

    Watlow & Eurotherm tradeshow booth at SPS 2024
    Events & Webinars

    Stay connected with Watlow through a variety of events, including upcoming trade shows, webinars, corporate and community involvement activities.

    Learn More

    About Us

    About Us Leadership Team Company History Watlow Worldwide

    Core Values

    core values compass
    The Watlow Way

    At Watlow, our lean journey, as well as our core organizational beliefs are aligned with the Watlow Way, a set of core principles, behaviors and values which guides our company and is woven through every decision we make.

    Learn More

    Sustainability

    sustainability graphic - green earth
    Some of our best work is performed in areas intended to protect and preserve our environment

    We believe protecting the environment is everyone's responsibility and both our products and our own lean manufacturing processes are designed to address these challenges.

    Learn More

    News

    News
    Shiyi Zhou Joins Watlow® as Regional President for Asia Watlow® Welcomes Klaus Aarestrup as New Regional President of Europe Watlow’s New Large and Extra Large WATCONNECT® Control Panels Maximize Process Uptime with a Small Footprint Watlow’s New PM PLUS® 1/8 DIN PID Controller Watlow® Obtains KGS Certification on Flange and Circulation Heaters Watlow® Completes Acquisition of Eurotherm®
    View All News 

    Events

    Watlow & Eurotherm tradeshow booth at SPS 2024
    Events & Webinars

    Stay connected with Watlow through a variety of events, including upcoming trade shows, webinars, corporate and community involvement activities.

    Learn More
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    CMRT/EMRT & Russian Material Disclosure
     

    Conflict/Extended Mineral Russian Material Disclosure [.PDF]
    Events

    Watlow & Eurotherm tradeshow booth at SPS 2024
    Events & Webinars

    Stay connected with Watlow through a variety of events, including upcoming trade shows, webinars, corporate and community involvement activities.

    Learn More

    Product Documents

    Watlow Catalogs Specification Sheets User Manuals Software and Demos Brochures
    CAD Drawings Mobile Applications Watlow Patents Certifications & Approvals Retrofit Guides

    Tools and Calculators

    Wattage Calculator Ohm's Law Calculator 3-Phase Delta / Wye Calculator Glossary Equations Reference Data

    Customer Service Documents

    Invoice Payment Options Supplier Requirements Environmental Polices and Statements Copyright and Trademark Information Certifications & Approvals Policies Return Materials Authorization (RMA)

    Knowledge and Insights

    thumbnails of white papers relating to electrification and decarbonization
    White Papers
      Browse White Papers
    Tech Tips logo
    Tech Tips
      Browse Articles

    CMRT/EMRT & Russian Material Disclosure

    Conflict/Extended Mineral Russian Material Disclosure [.PDF]

    Events

    Watlow & Eurotherm tradeshow booth at SPS 2024
    Events & Webinars

    Stay connected with Watlow through a variety of events, including upcoming trade shows, webinars, corporate and community involvement activities.

    Learn More
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    At Watlow®, we recognize the importance of learning, experimenting, and building your career. Our student programs are a great way for you to gain hands-on experience and on-the-job learning from the start. Learn More
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  1. Tech Tips
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F4T/D4T

Latest Posts

How Data Logging Can Optimize Your Heat Processing

Modern heat processing operations can gain a competitive edge by leveraging advanced data logging technologies. The blog post explores how integrated systems like Watlow's ASPYRE® DT, F4T®, and D4T™ enable real-time monitoring of critical parameters such as run times, process temperatures, and system performance variations. These insights allow for improved process control, reduced scrap and downtime, and compliance with stringent industry standards like Nadcap. This article also traces the evolutions form traditional strip chart recorders to today's sophisticated digital data loggers, emphasizing their compatibility with various sensors and their role in facilitating industry 4.0 initiatives through enhanced connectivity and data integretion.

ASPYRE® Intelligent Power Controller F4T/D4T Data Logging RMA PLUS Industry 4.0 The Thermal Loop
Watlow on Jun 02, 2025
How to Set Up a PID Control Loop in a Watlow F4T Temperature Controller

Setting up a control loop in Watlow's F4T temperature and process controller is essential for achieving precise thermal management in industrial applications. This guide provides a step-by-step approach to configuring control loop using the COMPOSER® software, focusing on the integration of function blocks-inputs, outputs, and control elements. It emphasizes the importance of correctly connecting transmitters and receivers witin the function block diagram to ensure accurate signal flow. Additionally, the article highlights best practices for parameter configuration, sensor calibration, and safety precautions to optimize system performance and reliability.

Control Loops F4T/D4T Process Controllers Temperature Control
on Jun 02, 2025
Downloading Ethernet and Serial Drivers for Watlow® Controllers

Serial drivers and the Ethernet are major components in field communications within the infrastructure of advanced heating products. Learn more.

Connectivity F4T/D4T PM PLUS Process Controllers
Admin on May 27, 2025
Cut Time, Costs and Complexity With the Integrated Capabilities of an F4T® Controller

Eliminate much of the complexity and cost of having several devices to ensure continuous operations and efficient performance, with Watlow’s user-friendly F4T® temperature and process controller. Learn more

F4T/D4T Part Numbers Process Controllers VISUAL DESIGNER™
Admin on Oct 06, 2021
The Coefficient of Thermal Expansion and your Heating System

The relationship of how materials expand or contract through temperature change is driven by the coefficient of thermal expansion or CTE of those materials and is a critical factor when designing a heater.

F4T/D4T Part Numbers Process Controllers VISUAL DESIGNER™
Watlow on May 06, 2021
The Benefits of a Watlow® Pre-Configured F4T® Temperature Controller for Industrial Applications

Updating your temperature controller or adding a new system to your facility does not have to take hours, thanks to the Watlow® pre-configured F4T®. Learn more.

F4T/D4T Part Numbers Process Controllers VISUAL DESIGNER™
Admin on Nov 11, 2020
Electrification and Decarbonization Solutions from Watlow®: Optimizing Process Heating Systems

Converting from traditional gas-fired equipment is an attractive option for many companies thanks to recent advances in heat exchanger technology and process controlling by Watlow®. Read more.

ASPYRE® Intelligent Power Controller Decarbonization Electrification F4T/D4T OPTIMAX®
Admin on Nov 06, 2020
Retrofitting from the Watlow® SERIES F4 to the F4T® – A Smarter Upgrade for Your Process Controller

Transitioning to a new process controller does not need to be an arduous process. Watlow® has created the new F4T® with retrofitting in mind. This means you can be back up and running in as little time as possible.

F4T/D4T Fundamentals Process Controllers
Admin on Nov 06, 2020
The Benefits of Cascade Control

Cascade control involves the use of two discrete control loops. Learn how cascade control can improve your process.

Cascade Control Control Loops Fundamentals Single-Loop Control F4T/D4T
on Sep 22, 2020
WHITE PAPER: Meeting Nadcap Requirements with Modern Data Logging Methods

Modern process controllers not only help suppliers in the aerospace industry to comply more easily with Nadcap requirements and speed up audits—they also help guarantee quality. A great example of such a controller is Watlow’s F4T, which incorporates batch mode functionality and hassle-free, pre-formatted reports.

NADCAP Aerospace & Defense Data Logging F4T/D4T Process Controllers Temperature Control
on Apr 20, 2020
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