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Watlow Series F4S to F4T Control
Retrofit Guide

Use the Retrofit Application below to find the Watlow recommended upgrade
for your Watlow Series F4S Control to the new F4T Series or call us for help.
Watlow Series 988 Control

Watlow’s Series F4 1/4 DIN industrial controllers offer an easy to setup and operate solution for the most demanding ramp and soak processing applications. The features and performance of these units make them ideally suited for environmental chamber or furnace and oven applications. Single and dual channel versions are available.

These competitively priced controllers feature a four line, high definition LCD interface display that makes profile programming and controller configuration significantly faster and easier. A 16-bit microprocessor supports all the accuracy and performance advantages you have come to expect from a Watlow control.

Up to 256 steps can be programmed into as many as 40 nameable profiles. Profiles can be programmed to wait for events or for up to three different process variables. A guaranteed soak feature allows you to set how closely your process needs to be controlled.

The four digital event inputs can be programmed to remotely start, pause or terminate any of your preprogrammed process recipes. The eight event outputs are segment programmable, or three of them can be assigned to programmable compressor and boost heat/boost cool control. A real time clock can be used to start a profile at any time.

Serial communication and dual alarm relays are included in the base unit. The Series F4 ramping controllers are packaged with a NEMA 4X front face to withstand harsh environments, and a four-inch deep case with removable connectors for wiring convenience.

The Series F4 controllers are manufactured by ISO 9001 registered Watlow Controls and backed by a three-year warranty. Two to four day availability on all standard models.

Features and Benefits

  • Guided 256 step, 40 profile, ramp & soak programmable memory
  • High definition 4-line LCD controller interface display
  • Menu customization
  • High performance 16-bit microprocessor
  • Universal inputs
  • Field upgradable expandable modular construction
  • Enhanced environmental chamber control
  • Cascade control
  • Real time clock with battery backup
  • 3-year warranty
  • Accuracy to ±0.1% of span
  • 32 to 130°F operating environment
  • EIA-232 & EIA-485 serial communication interfaces
  • Online help screens

Download Watlow F4D/S Ramping Control Brochure (pdf 186K)

Watlow Series F4D to F4T Retrofit Application
The Watlow recommends upgrading Series F4D with the Watlow F4T Series. To find the recommended F4T replacement for your Watlow Series F4D Controller, please enter the part number of your existing Watlow F4D using the pull down menus below, answer the option questions, then click on the submit button below, the replacement part number(s) and price(s) will be shown on the next page. Download the Watlow F4T Series Spec Sheet.
- - */**/***
Do you use/want the Cascade feature?
How many Digital I/O do you use/want (0 to 12)?
Do you use/want the 232/485 Communications feature?

* English language only available on the F4T. 500ohm RTD input not available on the F4T.
**Some models have non-standard overlays or custom firmware designated by the 11th and 12th digits. If the last two digits are not RG, AA, AC, or AJ you may need to contact the OEM for the proper replacement.
*** The F4T is limited to 2 "F" process outputs. If your F4D has 3 or 4 "F" process outputs you will be short.

This page last modified on 11/8/2016

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