Watlow’s PM PLUS™, the enhanced EZ-ZONE® PM, is now more intuitive and features an enhanced interface for easier programming and readability with a SMOOTH-TOUCH™ keypad creating an industry leading user experience. The PM PLUS is backwards compatible with legacy EZ-ZONE PM controllers but offers many user upgrades including an intuitive menu flow allowing the controller to be easily configured. It also continues to offer the industry leading Bluetooth® connectivity with the EZ-LINK™ mobile app for remote access capability and full descriptions of parameters and error codes. The PM PLUS improves the user experience by reducing the complexity at the front of the control while eliminating the dependency of cables when configuring the product.

Like the original EZ-ZONE PM, the PM PLUS can be ordered as a PID controller, or an integrated controller with multiple functions combined into one.

Features and Benefits
Intuitive menu flow

  • Reduces menu structure to a list of lists allowing the controller to be easily configured
  • Offers easy to read characters and color coding making the display visible from many angles



  • Eliminates contamination points on the front of the controller
  • No mechanical components will wear out
  • Creates a better seal on front panel
  • Easy to clean


Bluetooth® compatible with EZ-LINK™ mobile app

  • Provides full descriptions of parameters and error codes
  • Allows remote access capabilities without the use of cables or converters
  • Provides the ability to configure the product and save parameter sets


Integrated PID and limit controller

  • Reduces wiring time and termination complexity compared with connecting discrete products
  • Decreases required panel space
  • Lowers installation costs
  • Increases user and equipment safety for over/under temperature conditions


High amperage power control output

  • Drives 15 ampere resistive loads directly
  • Reduces component count
  • Decreases cost of ownership


Current monitoring

  • Detects heater current flow and provides alarm indication of a failed output device or heater load
  • Drives output on open or shorted heater


Serial communication capabilities

  • Provides a wide range of protocol choices including Modbus® RTU, EtherNet/IP™, Modbus® TCP, PROFIBUS DP, DeviceNet™ and J1939 CAN bus
  • Supports network connectivity to a PC or PLC


Enhanced control options

  • Easily handles complex process problems such as ratio, differential, square-root, motorized valve control without slidewire feedback, wet-bulb/dry-bulb, compressor control and peltier loads


Countdown timer option

  • Provides batch process control
  • Supports set point change during countdown 10-point linearization curve
  • Improves sensor accuracy EZ-LINK™ mobile application for iPhone® and Android™
  • Expedites controller setup with intuitive navigation
  • Simplifies setting parameters with plain text names and descriptions
  • Connects quickly and easily via Bluetooth® wireless communications


Configuration communications with software

  • Includes Watlow standard bus communications used by COMPOSER® or EZ-ZONE configurator software


Advanced PID control algorithm

  • Offers TRU-TUNE®+ adaptive control to provide tighter control for demanding applications
  • Provides auto-tune for fast, efficient start-up Built-in sensor compensation curves
  • Saves cost of buying compensated sensors
  • Includes Vaisala RH and altitude (pressure) curves Remote set point operation
  • Supports convenient set point manipulation from a remote device such as a master control or PLC


Profile capability

  • Offers pre-programmed process control
  • Allows ramp/soak programming with 40 total steps


Retransmit output

  • Supports industry needs for recording


Factory Mutual (FM) approved over/under limit with auxiliary outputs

  • Increases user and equipment safety for over/under temperature conditions Memory for saving and restoring parameter settings
  • Decreases service calls and time down


Agency approvals: UL® listed, CSA, CE, RoHS, W.E.E.E., FM, SEMI F47-0200, Class 1, Div. 2 rating on selected models

  • Assures prompt product acceptance
  • Reduces end product documentation costs


Touch-safe package

  • Increases safety for installer/operator
  • Complies with IP2X requirements


Programmable function key

  • Enables simple, one-touch operation of user-defined,
    repetitive activities


Programmable menu system

  • Reduces setup time and increases operator efficiency


Three-year warranty

  • Provides product support and reliability


Specifications Controller

  • User-selectable heat/cool, on-off, P, PI, PD, PID or alarm action
  • Auto-tune with TRU-TUNE+ adaptive control algorithm
  • Control sampling rates: input = 10Hz, outputs = 10Hz


Profile Ramp/Soak

  • 4 profiles, 40 total steps
  • Accuracy (typical): ±30 PPM at 77°F (25°C) +30/-100 PPM at -4 to 149°F (-20 to 65°C)


Isolated Serial Communications

  • EIA 232/485, Modbus® RTU
  • EtherNet/IP™/Modbus® TCP
  • DeviceNet™
  • SAE J1939 CAN bus


Wiring Termination—Touch-Safe Terminals

  • Input, power and controller output terminals are touch safe, removable, 12 to 22 AWG


Universal Input

  • Thermocouple, grounded or ungrounded sensors greater than 20MΩ input impedance, 3μA open sensor detection, 2kΩ source resistance max.
  • RTD 2- or 3-wire, platinum, 100Ω and 1000Ω @ 32°F (0°C) calibration to DIN curve (0.00385 Ω/Ω/°C)
  • Process, 0-20mA @ 100Ω, or 0-10VDC @ 20kΩ, 0-50mV at 20MΩ, 0-1000Ω potentiometer; scalable; inverse scaling


Functional Operating Range

Type J: -346 to 2192°F (-210 to 1200°C)
Type K: -454 to 2500°F (-270 to 1371°C)
Type T: -454 to 750°F (-270 to 400°C)
Type E: -454 to 1832°F (-270 to 1000°C)
Type N: -454 to 2372°F (-270 to 1300°C)
Type C: 32 to 4200°F (0 to 2315°C)
Type D: 32 to 4200°F (0 to 2315°C)
Type F: 32 to 2449°F (0 to 1343°C)
Type R: -58 to 3214°F (-50 to 1767°C)
Type S: -58 to 3214°F (-50 to 1767°C)
Type B: 32 to 3300°F (0 to 1816°C)
RTD (DIN): -328 to 1472°F (-200 to 800°C)
Process: -1999 to 9999 units


  • Calibration accuracy and sensor conformity: ±0.1% of span, ±1°C @ the calibrated ambient temperature and rated line voltage
  • Types R, S, B; 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.


Thermistor Input

  • 0 to 40kΩ, 0 to 20kΩ, 0 to 10kΩ, 0 to 5kΩ
  • 2.252kΩ and 10kΩ base at 77°F (25°C)
  • Linearization curves built-in


Current Transformer Input

  • Accepts 0-50mA signal (user-programmable range)
  • Displayed operating range and resolution can be scaled and are user-programmable


Digital Inputs (DC Voltage)

  • Max. input: 36V at 3mA
  • Logic: min. high state 3V at 0.25mA, max. low state 2V


Digital Inputs (Dry Contact)

  • Logic: min. open resistance 10kΩ, max. closed resistance 50Ω
  • Max. short circuit: 20mA 2 Digital I/O (ordered with power supply option)
  • Update rate: 10Hz
  • Input type: user-selectable, dc voltage or dry contact
  • Output type: switched dc
  • Output voltage: 24V
  • Output 5: 24mA max. or drive one 3-pole DIN-A-MITE®
  • Output 6: 10mA max.


Output Hardware

  • Switched dc: 22 to 32VDC @ 30mA max. per single output and 40mA max. total per paired outputs (1 & 2, 3 & 4)
  • Open collector: 30VDC max. @ 100mA max.
  • SSR, Form A, 24 to 240VAC, 1A at 50°F (10°C) to 0.5A at 149°F (65°C) resistive load, 264VAC max., opto-isolated, without contact suppression, 120/240VAC @ 20VA pilot duty
  • Electromechanical relay, Form A, 24 to 240VAC or 30VDC max., 5A resistive load, 100,000 cycles at rated load, 120/240 @ 125VA or 24VAC @ 25VA pilot duty
  • Electromechanical relay, Form C, 24 to 240VAC or 30VDC max., 5A resistive load, 100,000 cycles at rated load, 120/240 @ 125VA or 24VAC @ 25VA pilot duty
  • NO-ARC relay, Form A, 85 to 264VAC, 15A @ 122°F (50°C), resistive load, no VDC, 2,000,000 cycles at rated load
  • Universal process output: range selectable; 0 to 10VDC ±15mV into a min. 1,000Ω load with 2.5mV nominal resolution; 0 to 20mA ±30μA into max. 800Ω load with 5μA nominal resolution; temperature stability 100ppm/°C


Operator Interface

  • LCD display
  • SMOOTH TOUCH keypad
  • Programmable function key


Line Voltage/Power

  • High voltage option: 85 to 264VAC, 47 to 63Hz
  • Low voltage option: 20 to 28VAC, +10/-15%; 50/60Hz, ±5% or 12 to 40VDC
  • Max. power consumption: 10VA (1/32 and 1/16 DIN); 14VA Environment
  • Operating temperature: 0 to 149°F (-18 to 65°C)
  • Storage temperature: -40 to 185°F (-40 to 85°C)
  • Relative humidity: 0 to 90% RH, non-condensing


Agency Approvals

  • cULus® UL®/EN/CSA C22.2 No 61010-1 Listed, File E185611
  • CSA C22.2 No. 24, File 158031 (1/32 and 1/16 DIN sizes
  • IP 67, IP 66 front seal
  • UL® Type 4X front seal indoor locations
  • cULus® ANSI/ISA 12.12.01-2012, CSA-C22.2 No. 213-1987, Class 1, Div. 2, Groups A, B, C and D, Temperature Code T4A, File E184390 (optional)
  • FM Class 3545 (limit controls)
  • CE, RoHS by design, W.E.E.E.
  • EtherNet/IP™ and DeviceNet™ ODVA Conformance Tested displays