Process Controllers | McMaster-Carr

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2,876 Products

Fluid Handling

Temperature Controllers

Precisely regulate process temperatures; more accurate than temperature switches

93 products

Temperature Switches

Turn heating equipment on or off at a specified temperature

137 products

Water Heater Thermostats

Replace the thermostat on your water heater

3 products

Pressure Switches

Activate controls, set off alarms, and power equipment when a set pressure is reached

308 products

Differential Pressure Switches

Activate controls and alarms when the pressure difference between process lines exceeds a setpoint

53 products

Vacuum Switches

Activate controls, set off alarms, and power equipment when a set vacuum is reached

26 products

Pressure and Vacuum Switches

Activate controls, set off alarms, and power equipment when a set pressure or vacuum is reached

6 products

Flow Switches

Turn equipment on or off when flow rate reaches a set point

173 products

Electrical

Programmable Logic Controllers

Program complex automation jobs by combining the functionality of a relay, timer relay, and switch

91 products

Edge Controllers

Use in automated systems to monitor sensors, control actuators, and support wireless connections

1 product

Human-Machine Interfaces

Control PLCs, inverters, and other automated equipment; also known as HMIs

1 product

Potentiometers

Control speed, volume, and light intensity by varying electrical flow; also known as rheostats

23 products

Relays

Electrically open and close circuits to control power to lights, motors, and other equipment

698 products

Timer Relays

Turn machinery on or off after receiving an electrical signal that starts the timer

195 products

Current Relays

Prevent AC current overload in equipment such as motors and heaters

5 products

Motor Starters

Turn motors on and off and protect them from current overloads

414 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

215 products

Motor Switches

Turn motors, lighting, and electric heat circuits on and off

45 products

Motor Controllers

Store and run programs and send signals to a driver to control the motion of a stepper motor

3 products

Motor Drives

Receive signals from a motor controller and deliver them to your stepper motor

3 products

Transfer Switches

Switch to backup power during an outage

14 products

Computers

Sturdy and reliable for harsh industrial jobsites, from frigid freezers to sweltering foundries

5 products

Tablets

Tough enough to withstand drops, grime, and heavy use

5 products

IO Link Programmers

Configure your IO Link devices without a PC, outlet, or separate software

1 product

Electrical Adapters

Change electrical connectors to another type, size, or gender

3 products

Heating, Ventilation, and Air Conditioning

HVAC Switches

Control and monitor airflow in HVAC systems automatically

3 products

Thermostats

Connect to heaters, fans, and air conditioners to control the temperature

67 products

Measuring and Inspecting

Inertial Measurement Units

Mount to robot arms, cranes, and vehicles to accurately track their movements

1 product

Decade Boxes

Test and troubleshoot circuits without needing to solder capacitors or replace resistors

2 products

Power Transmission

Stepper Motors

The motor shaft turns in small, equal increments for precise positioning

27 products

Electric Actuators

Push and pull loads with more precise positioning than air and hydraulic cylinders

19 products

Communication

Computer Monitors

Display information in tough conditions such as on factory floors and outdoor jobsites

9 products

Facility and Grounds Maintenance

Drinking Fountain Replacement Parts

Replace nozzles, regulators, filters, handles, and other original manufacturer parts

2 products