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EZ-ZONE® PM Limit Model

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The EZ-ZONE® PM panel mount limit controller from Watlow® offers control options to reduce system complexity and the cost of thermal loop ownership. The EZ-ZONE PM limit controller provides high amperage power controller output and over/under limit control in one space saving, panel mount package.

Because the EZ-ZONE PM limit controller is scalable the customer only pays for what is needed. This controller is available in 1/32, 1/16, 1/8 and 1/4 DIN panel mount packages.

Specifications · Features and Benefits - Standard · Features and Benefits - Optional


  • Agency approved safety-shutdown over/under limit
  • User-programmable alarms
  • Control sampling rates: input = 10Hz, outputs = 10Hz
Isolated Serial Communications
  • EIA 232/485, Modbus® RTU
  • EtherNet/IP™/Modbus® TCP
  • DeviceNet™
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 @ 32ºF (0ºC) calibration to DIN curve (0.00385Ω/Ω/ºC)
  • 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 2192ºF (-210 to 1200ºC)
Type K: -454 to 2500ºF (-270 to 1371ºC)
Type T: -454 to 750ºF (-270 to 400ºC)
Type E: -454 to 1832ºF (-270 to 1000ºC)
Type N: -454 to 2372ºF (-270 to 1300ºC)
Type C: 32 to 4200ºF (0 to 2315ºC)
Type D: 32 to 4200ºF (0 to 2315ºC)
Type F: 32 to 2449ºF (0 to 1343ºC)
Type R: -58 to 3214ºF (-50 to 1767ºC)
Type S: -58 to 3214ºF (-50 to 1767ºC)
Type B: 32 to 3300ºF (0 to 1816ºC)
RTD (DIN): -328 to 1472ºF (-200 to 800ºC)
Process: -1999 to 9999 units

  • Calibration accuracy and sensor conformity: ±0.1% of span, ±1ºC @ the calibrated ambient temperature and rated line voltage
    • Types R, S, B; 0.2%
    • Type T below -50ºC: 0.2%
  • Calibration ambient temperature @ 77ºF ±5ºF (25ºC ±3ºC)
  • Accuracy span: 1000ºF (540ºC) min.
  • Temperature stability: ±0.1ºF/ºF (±0.1ºC/ºC) rise in ambient max.
Thermistor Input
  • 0 to 40kΩ, 0 to 20kΩ, 0 to 10kΩ, 0 to 5kΩ
  • 2.252kΩ and 10kΩ base at 77ºF (25ºC)
  • Linearization curves built-in
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 50ºF (10ºC) to 0.5A at 149ºF (65ºC) resistive load, 264VAC max., opto-isolated, without contact suppression, 120/240VAC @ 20VA 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
  • 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
  • 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/ºC
Operator Interface
  • Dual 4-digit, 7-segment LED displays
  • Advance, RESET, up and down keys, plus 1 or 2 programmable EZ-KEY(s) depending on model size
  • Typical display update rate: 1Hz
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
  • Data retention upon power failure via nonvolatile memory
  • Compliant with SEMI F47-0200, Figure R1-1 voltage sag requirements @ 24VAC or higher
  • Operating temperature: 0 to 149ºF (-18 to 65ºC)
  • Storage temperature: -40 to 185ºF (-40 to 85ºC)
  • Relative humidity: 0 to 90%, non-condensing
Agency Approvals
  • cULus® UL/EN/CSA C22.2 No 61010-1 Listed, File E185611
  • CSA C22.2 No. 24, File 158031
  • UL® 50 4X indoor locations, NEMA 4X, IP66 front seal
  • FM Class 3545
  • CE, RoHS by design, W.E.E.E.
  • EtherNet/IP™ and DeviceNet™ ODVA Conformance Tested

Features and Benefits - Standard

Configuration communications with software
  • Saves time and improves reliability of controller setup
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
  • Reduces service calls and down time
Agency approvals: UL® listed, CSA, CE, RoHS, W.E.E.E., FM, SEMI F47-0200
  • Ensures prompt product acceptance
  • Reduces end product documentation costs
Touch-safe package
  • Increases installer/operator safety
  • Complies with IP2X requirements
Consistent termination labeling connection system
  • Simplifies switching between products
  • Speeds up user's system documentation
  • Enables simple, one-touch operation of user defined, repetitive activities
Programmable menu system
  • Reduces setup time and increases operator efficiency
Three-year warranty
  • Ensures product support and protection

Features and Benefits - Optional

High amperage power control output
  • Drives 5 amperes resistive loads direct
  • Reduces component count
  • Decreases ownership cost
Serial communication capabilities
  • Provides a wide range of protocol choices including Modbus® RTU, EtherNet/IP™, Modbus® TCP, PROFIBUS DP and DeviceNet™
  • Supports network connectivity to a PC or PLC


· Dimensional Drawing of EZ-ZONE® PM 1/32 DIN

· Dimensional Drawing of EZ-ZONE® PM 1/16 DIN

· Dimensional Drawing of EZ-ZONE® PM 1/8 DIN - Horizontal

· Dimensional Drawing of EZ-ZONE® PM 1/8 DIN - Vertical

· Dimensional Drawing of EZ-ZONE® PM 1/4 DIN

· EZ-ZONE® Comparison Chart


· EZ-ZONE® PM Limit Model

· EZ-ZONE® PM Integrated PID Model