Temperature and Process Controller

Watlow’s PM PLUS™ controller is the enhanced evolution of the trusted EZ-ZONE® PM platform, redesigned to make precision temperature and process control simpler to set up, read, and maintain. An intuitive list-based menu structure and a high-contrast, colour-coded display make configuration straightforward and keep settings legible from almost any angle. A SMOOTH-TOUCH™ keypad replaces mechanical buttons with a sealed, solid-state surface that resists contamination, never wears out, and is easy to clean.

Full Bluetooth® connectivity through the EZ-LINK™ mobile app lets technicians configure parameters, view plain-language descriptions of every setting and error code, and save parameter sets — all without cables or converters. PM PLUS is fully backward compatible with legacy EZ-ZONE PM controllers and is available as a standalone PID controller or as an integrated controller that combines multiple control functions in one unit, cutting wiring time, panel space, and installation cost.

Key Features & Benefits

Intuitive interface

• List-of-lists menu structure that’s quick to learn and easy to configure
• High-contrast, color-coded LCD display readable from multiple viewing angles

SMOOTH-TOUCH™ keypad

• Solid-state touch surface with no mechanical components to wear out
• Creates a better seal on the front panel and is easy to clean
• Eliminates contamination points common to mechanical buttons

Bluetooth® and EZ-LINK™ mobile app

• Configure, monitor, and save parameter sets wirelessly — no cables or converters required
• Plain-text names and full descriptions for every parameter and error code
• Free app for iPhone® and Android™ devices

Integrated PID and limit control

• Combines PID and limit control in a single unit, reducing wiring, panel space, and installation cost
• Built-in over/under temperature protection increases equipment and operator safety

High-amperage power control

• Drives 15A resistive loads directly, reducing component count and total cost of ownership

Heater current monitoring

• Detects heater current flow and alarms on a failed output device or heater load
• Drives output on open or shorted heater conditions

Flexible communications

• Modbus® RTU, Modbus® TCP, EtherNet/IP™, PROFIBUS DP, EtherCAT®, DeviceNet™, SAE J1939 CAN bus, and Watlow’s inter-module bus
• Connects easily into new or existing PC and PLC networks

Advanced process control

• TRU-TUNE®+ adaptive PID algorithm with auto-tune for fast, accurate start-up
• Handles cascade, ratio, differential, square-root, motorized valve (without slidewire feedback), wet-bulb/dry-bulb, compressor, and peltier control strategies
• Four ramp/soak profiles with up to 40 total steps, plus a countdown timer for batch processes

Connected ecosystem

• Communicates over Watlow’s proprietary inter-module bus with ASPYRE AT displays and EZ-ZONE RM modules
• Shares heater diagnostics — amps, watts, ohms, voltage — and adds control loops, inputs, and outputs as systems grow

Built to last

• Three-year warranty
• UL® listed, plus CSA, CE, RoHS, W.E.E.E., FM, and SEMI F47-0200 approvals; Class 1, Div. 2 rating available on selected models
• Touch-safe, IP2X-compliant terminals for installer and operator safety

Watlow PM Plus Models

PM4 Plus: 1/4 DIN, 2 PID loops

PM6 Plus: 1/16 DIN, 1 PID loop

PM8 / PM9 Plus: 2 PID loops

Download data sheet for full product details.