Watlow Limit Controller / Watlow PM6

Watlow limit controllerGain versatile control in a compact package with a Watlow limit controller that prevents over and under temperature conditions. Accuracy and repeatable control are benefits of Watlow’s innovative microprocessor technology. Operators can easily adjust and review setpoint input. The devices’ rail and front panel mounting options offer installation ease. Limit controllers from Watlow come with a full range of agency approvals, ensuring certification requirements are met. Enhanced flexibility is featured in manual or automatic resets that can be performed after power cessation. With our reliable devices, temperature and power control is simplified.

How Do Limit Controllers Work?

Unlike a proportional-integral-derivative controller (PID), limit controllers do not compare and regulate process variables, including temperature, level, flow, position, and current. Instead, these devices are considered on/off controllers that stop operations when process or machine temperatures are out of range. Watlow’s limit controllers can be used as a backup to other controllers when safety concerns may be present, including temperatures that are too high or too low.  For machinery, manufacturer’s typically preset the upper and lower temperature setpoint values. For process control, the programmable logic controller (PLC) programmer will input the upper and limits into the human-machine interface (HMI) or PLC. Whenever a preset condition is violated, the limit controller forces a system shutdown or can trigger another process, such as a cooling phase.

EZ-Zone Watlow PM6 and More

Some of the Watlow limit controllers we have available include the Watlow PM, Watlow PM6, LV Series Control and the EZ-Zone control. The Watlow EZ Zone PM specs are shown below, for any questions concerning the LV series give our sales team a call we’ll answer all your questions. We’re here to support your efforts with great products and unparalleled customer service!  
Max Limit Loops: 1
Max Monitor Channels: 1
Alarms: 4
Mounting: 1/32, 1/16, 1/8, 1/4 DIN front panel
Max Output: 5A
Ambient Operating Range: -18 to 65°C (0 to 149°F)
Agency Approvals: UL®, CSA, CE, RoHS, W.E.E.E., FM, SEMI F47-0200
Communication Protocols: Standard Bus, EtherNet/IP®, DeviceNet, Profibus, Modbus® TCP, Modbus® RTU
Remote Limit Reset: Yes, if digital inputs are ordered
Display Height: 0.41 in. (11 mm) to 1.60 in. (41 mm)
Warranty (years): 3

Benefits of the Watlow EZ-ZONE® PM Limit Controller

Thermal loop processes are common for heating or cooling operations in plants, equipment, or consumer appliances. One side of these programs include PID control to regulate, adjust, and monitor temperatures. The other side, which includes a limit controller, is a safety protocol that’s designed to sense and power down a thermal process. The Watlow EZ-ZONE PM Limit Controller is a panel-mounted device that simplifies on/off control of temperature-driven processes. It’s also built to accommodate high-amperage power output and packaged in a small footprint (to save on panel enclosure space allocation). Other benefits include the programming of up to 4 alarms and communication protocols across multiple platforms, including Devicenet, ModBus, and standard Ethernet Protocol. The Watlow EZ-ZONE PM Limit Controller can be used in a wide range of environments and withstands ambient temperature ranges between 0 to 149 degrees Fahrenheit.  

Watlow LV Series

Low-voltage switching is useful in controlling power load circuits, such as those found in factory processes and industrial equipment. The Watlow LV Series features an easy-to-use display with turn rotary encoders for setpoint selection. This microprocessor-based temperature limit controller is an economical choice for machine or process safety, and is available in both panel or DIN rail mounting configurations. The Watlow LV Series limit controller is factory mutual (FM) approved with special UL® approval and has an operating range of 0 to 158 degrees Fahrenheit. Watlow LV limit controller

Benefits of the Watlow LV Series Limit Controller

  • LED Display: includes Set Fixed or Adjustable Setpoints
  • Manual or Auto Reset of High- or Low-Temp Limits
  • Multiple Mounting Options, Including DIN Rail or Panel Mount
  • Compact Design: Requires only 2.10 x 2.10 inches of panel space
  • 3-Year Manufacturer’s Warranty
Watlow is a leader in instrumentation and control solutions for a wide variety of industries, including manufacturing, medical, and foodservice.

Get a Watlow Limit Controller From Hi-Watt Today

Hi-Watt is an approved distributor of Watlow devices and has been serving Michigan and the surrounding areas since 1979. Visit us online to view our entire catalog of process heating products. We proudly serve clients in the chemical, industrial, and manufacturing sectors, and are happy to help you find the right limit controller for your needs. In addition to being a leading distributor of Watlow limit controllers, we also carry immersion heaters, industrial infrared heaters, cartridge heaters, band heaters, strip heaters and more. Click here to learn more.
LV Series Spec Sheet
EZ Zone PM Limit Control Spec Sheet
Watlow PM6
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