Watlow D4T Data Logger
Starting at $1,119.00


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  • 6 slots for flex modules (up to 24 channels)
    • High density modules have 4 channels per slot
  • 4.3-inch, color touch panel
  • Ethernet Modbus TCP connectivity
  • Programmable function blocks
  • Multiple high-speed USB host ports
  • COMPOSER graphical configuration PC software
  • Flexibility to meet diverse process applications
  • NEMA 4X/IP65

The Watlow D4T data logger offers a wide range of field removable I/O modules for maximum design flexibility. Configurations can be custom tailored to meet the scaling needs of a tremendous range of equipment and applications while providing exactly the hardware types required for compatibility. It is compatible with temperature, altitude, humidity, AC current and other 0-10VDC or 0-20mA process units.

The D4T easily complies with regulatory standards with the ability to choose encrypted, CSV or both types of file formats for tamper proof record needs. The D4T simplifies record keeping management with ability to archive records to the cloud or a connected PC network.

Watlow Mixed I/O Flex Modules
Single channel module for use with the Watlow F4T or D4T, 2 outputs available
Watlow Communication Flex Module
Modbus RTU 232/485 communications for slot 6 of the Watlow F4T or D4T
Watlow Limit Flex Module
Limit control with universal, thermistor and temperature inputs for use with Watlow F4T or D4T
Watlow High Density Flex Modules
Four channel input module for use with the Watlow F4T or D4T

Application Notes

Here's how some of our customers used this product.

Configurable High Input Data Logger

The Background: Our customer is a manufacturer seeking a data logger capable of recording data from 20 inputs so they can create an electronic record of parameters associated with their production process.

The Problem: The customer wants a compact logger with a display that can be expanded at a later time.

The Solution: We suggested the Watlow D4T data logger which can have up to 24 inputs and will fit in a standard 1/4 DIN panel cutout. The D4T has Plug-and-Play I/O cards so they can change the configuration in the future as their needs change.