Month: July 2026

Watlow’s family of microprocessor- based limit controllers

provide an economical solution for applications requiring

temperature limit control. Limits are available in a broad

range of packaging options, allowing selection of the best

version for an individual application. Controllers are

available without an operator interface and can be

ordered in square 1/8 DIN-panel mount, DIN-rail mount or

open board design configurations.

The SERIES LF limit family incorporates a microprocessor

design platform. This design provides significant

improvements in the performance, repeatability and

accuracy offered by Watlow’s current line of analog basic

temperature controllers.

The SERIES LF limit offers fixed set points and can be

supplied with or without an operator interface. Operating

set point temperature values are customer defined in the

product configuration

part number.

The LF limit controllers are factory mutual (FM) approved

with special UL® approval for the open board potted

versions. Watlow’s limit controllers include industry

leading service and support and are protected by a

three-year warranty.

EZ-ZONE RM

Additional Key Functions

• Configuration communication port (standard bus)

• Removable modules and connectors

• Ring lug and front-screw terminal options

• Profile ramp soak with 400 total steps

• Retransmit and remote set point input virtually inside

controller eliminating costs for input/output hardware

• User configuration settings can be stored and recalled

• Thermistor input

• Elevated operating range of 0 to 149°F (-18 to 65°C)

• UL® listed, CSA, CE, RoHS, W.E.E.E., FM,

SEMI F47-0200, Class 1, Div. 2 rating on selected

models

Common Specifications (Applies to all models)

Line Voltage/Power

• 20.4 to 30.8VAC/VDC, 50/60Hz ±5%

• Any external power supply used should comply with a

Class 2 or SELV rating (see specific module

specification listing for max. VA power consumption)

• Data retention upon power failure via non-volatile

memory

• Compliant with Semi F47-0200, Figure R1-1 voltage

sag requirements

Environment

• 0 to 149°F (-18 to 65°C) operating temperature

• -40 to 185°F (-40 to 85°C) storage temperature

• 0 to 90% RH, non-condensing

Features and Benefits

Multiple inputs; from one to 152 PID loops of

control or monitor up to 256 analog inputs

• Mix and match I/O to fit any application; from one

input with two outputs to 152 analog inputs with

152 outputs, or monitor up to as many as 256 analog

inputs all in one system

• Reduces cost because only required loops are

purchased

• Allows a common controller platform across many

design applications as both loops and outputs can

be ordered in single increments

Advanced PID control algorithm

• Offers TRU-TUNE®+ adaptive control to provide tighter

control for demanding applications

• Enables auto-tune for fast, efficient start-up

Communication capabilities

• Provides a range of protocol options including

universal serial bus (USB) device port, Modbus® RTU,

EtherNet/IP™, Modbus® TCP, DeviceNet™ and

PROFIBUS

USB port

• Provides data log retrieval

SPLIT-RAIL control

• Allows modules mounted in separate high-voltage

and low-voltage cabinets to function as an integrated

system

• Minimizes the length and cost of wire runs and

improves system reliability by locating inputs closer to

sensors and outputs closer to loads

AUTO CLONE

• Reduces time and configuration complexity by

automatically building a new module with the same

parameter settings as the replaced module

SENSOR GUARD

• Prevents unplanned process shutdowns and product

loss by switching to a backup sensor if the primary

sensor fails

Optional integrated controller functions can be

combined or ordered in different quantities:

• PID control loops

• Over/under temperature limit control loops

• 10 and 15 ampere power output/heater driver options

• On-board data logging

• Current measurement input

• Sequencer start up and control function

• Programmable timer and counter functions

• Programmable math and logic options

• Multiple communication protocol options

• Mobile configuration with removable secure digital (SD)

flash card

Benefits of using an integrated controller solution:

• Reduces wiring time and termination complexity

compared with connecting multiple discrete products

• Improves system reliability

• Reduces termination and installation cost

• Eliminates compatibility issues often encountered with

using various discrete components and brands

• Reduces troubleshooting time and downtime costs

because the system can specifically identify any

problems with a sensor, controller, solid state relay

(SSR) power output or heater load

• Complete thermal solution saves engineering

time and labor costs while shortening project

schedules

The EZ-ZONE RM controller simplifies thermal system

management. The EZ-ZONE RM controller family is

comprised of six module types: An integrated on-off or

PID control, monitoring and over/under temperature limit

module, a high-density on-off or PID control module,

a high-density limit only module, an input/output (I/O)

expansion module, a high-density monitor/scanner

module and a data logging and field communications

access module. A system is configured by connecting

any combination of module types to address specific

application needs. The EZ-ZONE RM is extremely flexible

and scalable allowing mixing and matching of I/O to

configure one to 152 control loops and up to 256

monitor points.

Now Watlow’s EZ-ZONE RM is available through

Watlow SELECT®, a program that enables you to quickly

identify, configure and receive your thermal products

faster and easier than ever before. 

Consistent Termination Labeling (CTL) connection

system

• Simplifies switching between products

• Speeds up user’s system documentation

Three-year warranty

• Demonstrates Watlow’s reliability and product support

High-amperage power control output (1/16 DIN only)

• Drives 15 ampere resistive loads direct

• Reduces component count

• Saves panel space and simplifies wiring

• Reduces cost of ownership

PM LEGACY™

Specifications

Line Voltage/Power

• 85 to 264VAC, 47 to 63Hz

• 20 to 28VAC, +10/-15%; 50/60Hz, ±5%

• 12 to 40VDC

• 10VA (1/32 and 1/16 DIN)

• Data retention upon power failure via non-volatile

memory

• Compliant SEMI F47-0200, Figure R1-1 voltage sag

requirements @ 24VAC or higher

Environment

• 0 to 149°F (-18 to 65°C) operating temperature

• -40 to 185°F (-40 to 85°C) storage temperature

• 0 to 90% RH, non-condensing

Accuracy

• Calibration accuracy and sensor conformity: ±0.1%

of span, ±1°C @ the calibrated ambient temperature

and rated line voltage

• Type S: 0.2%

• Type T below -50°C: 0.2%

• Calibration ambient temperature @ 77°F ±5°F

(25°C ±3°C)

• Accuracy span: 1000°F (540°C) min.

• Temperature stability: ±0.1°F/°F (±0.1°C/°C) rise in

ambient max.

The PM LEGACY™ series panel mount controller is an

industry leading PID controller that allows optimal performance

utilizing simple control and menu functionality

without complex features. It is ideally suited for basic

applications and usage levels.

The LEGACY includes one universal input and an option

for up to two outputs and is available in 1/32. and 1/16

DIN panel mount packages. It can be ordered as a PID

process controller or as a dedicated over and under-temperature

limit controller.

Features and Benefits

Simplified menu

• Fits basic applications with a user-friendly interface

supported by two menus and a streamlined list of

parameters

• Eliminates user complexity often experienced with

more advanced controllers and unnecessary features

• Reduces user training costs and user programming

errors

PID auto-tune

• Provides auto-tune for fast, efficient start-up

Standard bus communications

• Allows easy product configuration via PC

communications protocol and free software

• Saves time, simplifies programming process and

improves reliability of controller setup

Factory Mutual (FM) approved over and under limit

with auxiliary outputs

• Increases user and equipment safety for over and

under-temperature conditions

Touch-safe package

• Increases installer and operator safety

• Complies with IP2X requirements

EZ-ZONE® Remote User Interface (RUI) Provides Keypad and Display

Access to Parameters in EZ-ZONE RMs and EZ-ZONE STs and Features

Communication Gateway Options

Features and Benefits

Ability to communicate with programmable logic controller

(PLC), personal computer (PC) or operator interface (OIT)

• Optional EIA 485 Modbus® RTU

• RUI/communications gateway with optional EIA 232/485

Modbus® RTU, EtherNet IP™/TCP Modbus®, DeviceNet™ or

PROFIBUS DP

Provides user interface for EZ-ZONE products

• Supports menu navigation and access to parameter settings

in EZ-ZONE RM modules and EZ-ZONE ST controllers

User-customizable EZ key

• Executes the user-selected EZ key option in the selected

device

Supports EZ-ZONE password protection

• Presents menus from connected EZ-ZONE products

according to the customizable read and write lock settings

and requires password if that feature is enabled in the

product

Specifications for Basic Remote User Interface (RUI)

Operator Interface

• Dual 4 digit, 7 segment LED displays

• Forward, backward, up and down keys plus a customer

programmable function key – EZ key

• Typical display update rate: 1Hz

• Agency approved to IP65/NEMA 4X

• Standard bus (ships with all units). Options:

EIA 232/485 Modbus® RTU, EtherNet/IP™/TCP Modbus®

or DeviceNet™, PROFIBUS DP

Line Voltage/Power

• 100 to 240VAC, +10/-15%; (85-264VAC) 50/60Hz, ±5%

• 24VAC/VDC, +10/-15%; 50/60Hz, ±5%

Agency Approvals

• UL®, CSA, CE, RoHS, W.E.E.E.

Features and Benefits (cont.)

Screen object password security with programmable hierarchy and multiple users

• Prevents errors and tampering by allowing only authorized users to access restricted items on the screen

• Allows flexible hierarchies by letting the developer assign each screen object to any of 12 groups

and grant each user access to any combination of groups

• Provides password protection for upload, download and access to local setup

• Supports up to 127 users

Screen object invisibility and/or interlock control

• Prevents errors by guiding operators

Powerful, easy-to-use EZwarePlus programming

software

• Requires only a small investment in time to create a

useful interface

• Provides the ability to learn additional features as

needed

• Provides advanced interface features such as animation and pop-up windows

• Reduces development time by providing extensive graphical libraries and facilitating reuse with

user-created libraries

• Simplifies development by allowing import of common graphic formats: bitmaps, JPEGs and animated GIFs

User-programmable macros with math functions and support for floating point

• Extends functionality

• Automates processes

TrueType fonts with Unicode (international) characters and language switching feature

• Makes screens easy to read by allowing bold, italic, underlined, scrolling and blinking text to direct operator’s eyes

• Prevents errors by communicating with users in their native languages

• Reduces development and support by allowing

inclusion of up to 24 user-selectable languages in a project

UL®, NEMA 4. CE, RoHS

• Allows use in harsh industrial environments

• Assures prompt product acceptance

Features and Benefits

Bright, color, high resolution, graphic, touch screen,

thin film transistor (TFT) display

• Maximizes display space in the OIT footprint

• Allows application specific interface design

• Allows viewing from a distance and at an angle

• Highlights important process information with color

and animation

User selectable portrait or landscape operation

• Fits in tight spots

Ethernet, serial and USB host ports

• Allows options for connecting to controllers

• Provides options for downloading projects

• Expands memory for recipe and data log storage

• Supports barcode readers, keyboard, mouse and printers

• Supports monitoring from a personal computer (PC) with free VNC Client software

Support for over 100 protocols, up to three

simultaneously plus multiple protocols over Ethernet

• Connects to a wide range of industrial controllers and devices

• Integrates a variety of devices to simplify complex operation tasks

Data logging, display and trending

• Helps operators monitor processes

• Reduces labor and increases accuracy by automating time-stamped data collection

• Stores captured data for future retrieval in multiple files

• Saves time by exporting data to Excel®-compatible comma separated value (.csv) files

• Improves process understanding by allowing live and historical data to be viewed on the OIT

Alarm and event email notification, monitoring and recording

• Reduces downtime by helping troubleshoot equipment and processes

• Simplifies troubleshooting by recording time and

date-stamped alarm and event history

• Organizes and prioritizes alarms and events in up to 255 categories and four priority levels

Recipe management

• Reduces errors by automating process setting changes

Offline and online simulation

• Speeds up development by making it faster and easier

to test projects

• Allows faster creation of fine-tuned interfaces by

speeding up iterations

Time or trigger-based data exchange

• Simplifies integration by allowing the OIT to copy data from one controller or OIT to another

Internal, piezoelectric buzzer

• Provides audible alarms and key chirp

Two-year warranty

• Provides product support and reliability