Sensors | McMaster-Carr

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11,383 Products

Electrical

Sensor Switches

Sensor Switches

Detect moving objects from a distance, triggering a circuit to open or close

Limit Switches

Turn equipment on or off when objects touch the actuator; often used for conveyors and bin filling

Magnetic Switches

Magnetic Switches

Actuate when a magnet comes within sensing distance; often used to detect when doors or windows open

Development Board Sensor Modules

Development Board Sensor Modules

Transform your development board into everything from an airflow monitor to a motion detector

Snap-Acting Switches

Snap-Acting Switches

Open and close circuits quickly to minimize arcing and sticking; often used as door-open indicators

Speed-Monitoring Switches

Speed-Monitoring Switches

Avoid downtime and machinery damage by detecting slowdowns in drive trains and conveyors

Switch Mounts

Mount sensor switches to panel cutouts, tank walls, or conveyors

Light Switch Sensors

Light Switch Sensors

Automatically turn lights on and off when you enter and exit rooms

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

Tilt Switches

Trip circuits when tilted; use as position indicators, pump level controls, and limit switches

Manual Switches

Manual Switches

Everything from toggle, push-button, and rocker switches to foot switches

Rotary Encoders

Rotary Encoders

Track the distance, direction, and speed of travel of motor shafts, conveyors, and wheels

Vibration Switches

Vibration Switches

Monitor vibration in machinery and shut it down or sound an alarm if levels rise

Current Relays

Prevent AC current overload in equipment such as motors and heaters

Multifunction Chemistry Controllers

Multifunction Chemistry Controllers

Use pH or oxidation reduction potential (ORP) levels to turn equipment on or off

Relays

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

Conductivity Controllers

Conductivity Controllers

Turn pumps, mixers, and valves on and off based on a solution’s conductivity

Safety Switches

Safety Switches

Protect people by cutting power to machines when access doors open; also known as interlock switches

Light Switch Sensor Guards

Light Switch Sensor Guards

Protect light switch sensors from damage and vandalism

Electrical Cords

Electrical Cords

Connect equipment and devices to a power supply

Terminal Blocks

Terminal Blocks

Mate with terminals to complete circuits in control panels, motors, and small machines

Thermistor Sensors

Thermistor Sensors

Pair with temperature controllers to check the temperature of devices and maintain ideal conditions

Current Conditioners

Current Conditioners

Lower current flows to levels that work with panel monitors and other electrical measuring equipment

Wire and Cable Strippers

Wire and Cable Strippers

Remove the outer insulation on wire and cable

Measuring and Inspecting

Signal Output Testers

Signal Output Testers

Check if the signal output of a DC switch is NPN or PNP to know how to wire components

Multimeter Line Splitters

Multimeter Line Splitters

Use with a multimeter to determine current usage of devices without pulling apart their wires

Multimeters

Take current, voltage, resistance, and other electrical measurements

Voltage Detectors

Voltage Detectors

Check for voltage in receptacles, cables, and other electrical components

Current Detectors

Current Detectors

Check for AC current and voltage without making direct contact with wire

Electrical Resistance Meters

Electrical Resistance Meters

Prevent damage to electronics by checking material and surfaces for static discharge

Test Leads

Pair with electrical testers such as multimeters to analyze your devices

Test Lead Sensors

Test Lead Sensors

Adapt Fluke multimeters to take temperature readings, so you don't need a separate meter

Current Indicating Rings

Current Indicating Rings

Run wire through rings to monitor AC current flow

Electronic-Component Testers

Electronic-Component Testers

Test, identify, and troubleshoot components such as circuit boards and diodes

Voltage Meters

Measure voltage in electrical components

Cameras

Capture pictures and video, or install on robot arms or conveyor lines to inspect and sort your line

Machine Vision Cameras

Machine Vision Cameras

Inspect objects on conveyor lines for defects such as surface flaws and missing screws

Monoculars

Magnify still objects from far away to view features you couldn't see with the naked eye

Stud Finders

Pinpoint the location of metal or wood studs in drywall, plywood, and other materials

Ultraviolet Inspection Lights

Ultraviolet Inspection Lights

Shine on equipment to detect traces left behind by leaks, rodents, and other contaminants

Magnetic Particle Flaw Detection Kits

Magnetic Particle Flaw Detection Kits

Everything you need to detect imperfections on or below metal surfaces

Magnetic Yokes

Pair with magnetic particles to find defects on or below metal surfaces

Thermometers

Monitor temperature in tanks, pipes, control panels, and other equipment

Thermometer Cooling Jackets

Thermometer Cooling Jackets

Connect to a compressed air or water line to keep infrared thermometer transmitters from overheating

Thermometer Air Purges

Thermometer Air Purges

Blow dust and moisture off infrared thermometer transmitter lenses

Thermometer Covers

Thermometer Covers

Prevent dirt buildup on infrared thermometer transmitters

Thermometer Insulating Tubes

Thermometer Insulating Tubes

Prevent infrared thermometer transmitters from overheating by shielding them from hot surfaces

Combustion Analyzers

Combustion Analyzers

Measure boiler and furnace combustion efficiency

Temperature and Humidity Meters

Temperature and Humidity Meters

Simultaneously measure temperature and relative humidity

Thermal Cameras

Thermal Cameras

Detect hot spots, leaks, moisture problems, and construction defects invisible to the eye

Temperature Crayons

Temperature Crayons

Less messy than liquids, draw marks that melt as surfaces reach a specific temperature

Temperature-Indicating Sheets

Temperature-Indicating Sheets

Stick to surfaces and the color changes as the temperature rises and falls

Humidity-Indicating Plugs

Humidity-Indicating Plugs

Monitor humidity in sealed containers without opening them, protecting the inside from contamination

Humidity Meters

Humidity Meters

Measure relative humidity without complex calculations

Humidity-Indicating Cards

Humidity-Indicating Cards

Check humidity levels of moisture-sensitive inventory and equipment at a glance

Temperature-Indicating Liquids

Temperature-Indicating Liquids

Brush onto surfaces and markings melt when they reach a specific temperature

Shaft Alignment Kits

Shaft Alignment Kits

Confirm that shafts are aligned or measure the degree of their misalignment

Levels

Ensure surfaces are completely horizontal or vertical

Band Saw Blade Alignment Gauges

Band Saw Blade Alignment Gauges

Keep band saw blades straight between guides

Level Mounts

Strap to nonmagnetic surfaces to attach a magnetic level

Load Cells

Measure forces and send them to computers to monitor and trigger actions in machinery

Load Cell Displays

Load Cell Displays

Connect to load cells to view weight measurements

Load Cell Junction Boxes

Load Cell Junction Boxes

Join multiple load cells to combine their weight measurements

Belt Tension Gauges

Belt Tension Gauges

Check belt tension to minimize vibration, noise, and slippage

Force Gauges

Test objects to see how much tension and compression force they can bear

Force Gauge Grips

Force Gauge Grips

Pair with force gauges to test wire, pins, and thin sheets

Torque Gauge Connectors

Torque Gauge Connectors

Replace square-drive connectors on torque gauges

Torque Gauges

Test the accuracy of torque wrenches and screwdrivers

Torque Sensors

Convert manually applied torque into an electrical signal that you can measure and record

Wristwatches

Display the time, date, and smart functions on your wrist and keep your hands free

Vibration Monitors

Vibration Monitors

Mount to your machine to continuously monitor vibration and ensure it stays within the proper range

Inertial Measurement Units

Inertial Measurement Units

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

Vibration Meters

Vibration Meters

Spot-check vibration to gauge the health of your machine

Tachometers

Measure the speed of rotating parts on machines such as shafts, gears, and belts

Stroboscopes

Shine a bright flashing light at moving belts and pulleys to measure speed and detect wear

Position Indicators

Position Indicators

Track components on rotating spindles or lead screws to help adjust machinery quickly and precisely

Chemistry Sensors

Chemistry Sensors

Pair with chemistry meters to test oxidation reduction potential (ORP) or pH

Air Particle Counters

Air Particle Counters

Monitor indoor dust levels and measure filter efficiency in HVAC systems

Chemistry Meters

Chemistry Meters

Take water-chemistry measurements more precisely than test strips and swabs

Water Test Kits

Water Test Kits

All the chemicals and labware you need for on-site sampling and water-quality testing

Moisture Meters

Moisture Meters

Stick in wood and other building materials to view moisture levels

Squares

Check 90° angles during layout work with combination, angle, or pipefitters' squares

Machine Tool Indicator Contact Points

Machine Tool Indicator Contact Points

Replace the contact point on your machine tool indicator

Protractors

Set bevels and measure angles with everything from pocket-size to long-arm protractors

Combination Square Blades

Combination Square Blades

Connect to a combination square head to create a combination square

Angle Identifiers

Angle Identifiers

Place the edges against fittings, dies, and other objects to quickly verify angles up to 45°

Machine Tool Indicators

Machine Tool Indicators

Find the exact edge of a workpiece without math or guesswork to quickly align your machining setup

Angle Indicators

Angle Indicators

Align pipe and other equipment by measuring angle, level, or tilt

Combination Square Heads

Combination Square Heads

Attach combination square blades to form a combination square

Squareness Gauges

Squareness Gauges

Check frames and machined parts to see if they are leaning or uneven

GPS Navigators

Navigate on foot with real-time GPS data

Center Finders

Line up your drill with the center of round bars and pipe

Straightedge/Protractors

Straightedge/Protractors

Draw straight lines and measure angle, slope, and rise with one tool

Angle Transfers

Angle Transfers

Duplicate any angle in construction and other applications

Straightedges

Draw straight lines and check the straightness of surfaces

Center Punch/Angle Indicators

Center Punch/Angle Indicators

Find the center of pipe and other parts and determine setup angles on milling machines and grinders

Airflow Meters

Measure airflow in duct, air filters, exhaust hoods, and other air applications

Counters

Record and display the number of times events or processes occur

Radiation Detectors

Radiation Detectors

Test for radiation, even in low amounts or from microwave ovens

Gas Leak Detectors

Gas Leak Detectors

Find gas leaks in pipes, tubes, fittings, tanks, cylinders, and valves

Leak-Detecting Pipe Flange Covers

Leak-Detecting Pipe Flange Covers

Wrap around pipe flanges to show when there's a leak and contain it

Leak-Detecting Dyes

Leak-Detecting Dyes

Bright colors help you spot leaks in water and hydraulic systems without using ultraviolet light

Data Recorders

Log temperature, humidity, or pressure levels to track changes and troubleshoot your system

Data Recorder Charts

Data Recorder Charts

Place in temperature and humidity data recorders to document readings over time

Barometers

Measure atmospheric pressure changes

Compression Testers

Compression Testers

Check engine compression to maintain top performance

Stethoscopes

Detect internal mechanical problems like worn parts, excessive vibration, and fluid leaks

Magnetic Field Indicators

Magnetic Field Indicators

Measure the strength of a magnetic field in gauss

Weather Stations

Weather Stations

Measure multiple weather conditions at the same time

Light Meters

Measure light quality and intensity

Fluid Handling

Pressure Transmitters

Pressure Transmitters

Send pressure readings to controllers and remote displays

Pressure and Vacuum Transmitters

Pressure and Vacuum Transmitters

Convert pressure and vacuum measurements into a signal sent to remote displays and controllers

Differential Pressure Sensors

Differential Pressure Sensors

Attach to gauges and switches to detect static pressure changes in air-handling equipment

Pressure Gauges

Pressure Gauges

Measure pressure in pumps, filters, regulators, and process lines

Pitot Tubes

Connect to gauges to measure air flow in filters, cooling coils, and other air-handling equipment

Vacuum Transmitters

Vacuum Transmitters

Transfer vacuum measurements to remote displays and controllers

Differential Pressure Transmitters

Differential Pressure Transmitters

Relay pressure changes in heating, cooling, and pumping systems to controllers and remote displays

Pressure Test Gauges

Pressure Test Gauges

Check and calibrate pressure gauges, transmitters, and equipment to maintain accuracy

Vacuum Test Gauges

Vacuum Test Gauges

Verify that equipment is taking accurate vacuum measurements

Level Sensor Switches

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

Float Switches

Start process equipment such as pumps and motors when the liquid in your tank reaches the float

Float Switch Relays

Float Switch Relays

Amplify current to actuate equipment that has a higher current rating than your float switch

Flow Switches

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

Paddle Level Switches

Paddle Level Switches

Actuate when the paddle stops rotating to indicate the level of dry material

Thermocouples

Measure and transmit liquid, gas, and surface temperature

Thermocouple Connectors

Thermocouple Connectors

Join thermocouple probes and wire to thermometers and control panels

Thermocouple Transmitters

Thermocouple Transmitters

Check system temperatures from your smartphone or tablet

Thermocouple Connector Adapters

Thermocouple Connector Adapters

Convert round-pin male connectors to flat-pin male connectors

Temperature and Humidity Transmitters

Temperature and Humidity Transmitters

Regulate heating and cooling by sending temperature and humidity levels to PLCs and controllers

Noncontact Temperature Sensors

Noncontact Temperature Sensors

Monitor the temperature of hazardous, sensitive, and hard-to-reach materials without touching them

Humidistats

Control the humidity in an enclosure or space

RTDs

Measure and transmit liquid, gas, and surface temperature more precisely than thermocouples

RTD Transmitters

RTD Transmitters

Send temperature readings from RTD probes in containers, tanks, and pipes to switches and PLCs

RTD Connectors

Attach plug-in connectors to RTD probes with wire leads

Thermowells

Prevent damage to thermometers and temperature probes in pressurized tanks and pipelines

Humidity Controllers

Humidity Controllers

Monitor humidity and control it by automatically turning equipment on and off

Thermocouple and RTD Protection Tubes

Thermocouple and RTD Protection Tubes

Shield thermocouple and RTD probes in large, unpressurized tanks

Temperature Switches

Temperature Switches

Turn heating equipment on or off at a specified temperature

Flow Transmitters

Flow Transmitters

Send flow rate measurements to PLCs, data loggers, and remote displays

Liquid-Level Transmitters

Liquid-Level Transmitters

Send liquid-level data to logging and monitoring equipment

Liquid-Level Gauges

Liquid-Level Gauges

Monitor fluid levels in containers

Water Detector Sensors

Water Detector Sensors

Place near tanks, sump pumps, and pipe lines to alert you to water leaks

Pressure Switches

Pressure Switches

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

Vacuum Switches

Vacuum Switches

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

Differential Pressure Switches

Differential Pressure Switches

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

Pressure and Vacuum Switches

Pressure and Vacuum Switches

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

Safety Equipment

Oxygen Detectors

Oxygen Detectors

Too much or too little oxygen triggers alarms and warning lights

Multi-Gas Detectors

Multi-Gas Detectors

Monitor air for carbon monoxide and combustible gases including methane, hydrogen, and propane

Hydrogen Detectors

Hydrogen Detectors

Alarms and lights alert you to the presence of hydrogen

Heat Stress Monitors

Heat Stress Monitors

Measure temperature, humidity, and radiant heat to keep people safe from heat-related hazards

Carbon Monoxide Detectors

Carbon Monoxide Detectors

Alarms, lights, or color changes alert you to the presence of carbon monoxide

Propane Detectors

Propane Detectors

Alarms and lights alert you to the presence of propane instantly or after a set exposure time

Hydrogen Sulfide Detectors

Hydrogen Sulfide Detectors

Alarms and lights alert you to high levels of hydrogen sulfide

Carbon Dioxide Meters

Carbon Dioxide Meters

Measure and display real-time carbon dioxide levels for indoor ventilation quality

Methane Detectors

Methane Detectors

Alarms and lights alert you to the presence of methane instantly or after a set exposure time

Smoke Detectors

Smoke Detectors

Warn people when there's smoke in your facility

Smoke Detector Test Stations

Smoke Detector Test Stations

Test hard-to-reach HVAC smoke detectors from a convenient location

Heat Detectors

Signal your control panel when the temperature rises above a set level

Material Handling

Robot Safety Padding

Robot Safety Padding

Trigger an emergency stop when robot arms contact a worker or object

Conveyor Accessory Mounts

Conveyor Accessory Mounts

Position guides or sensors to the exact spot needed for your conveyor

Conveyor Brackets

Conveyor Brackets

Mount guide clamps, sensors, drip pans, and other attachments to conveyor frames

Lighting

Portable Work Lights

Portable Work Lights

Bring lighting to poorly lit or completely dark areas

Facility Lights

Facility Lights

Illuminate both indoor and outdoor areas with a permanent light source

Machine and Task Lights

Machine and Task Lights

Shine light on work areas, within enclosures, and inside machines

Building and Machinery Hardware

Brackets

Connect surfaces in an assembly

Positioning Arms

Positioning Arms

Mount and position tools, small electronics, and displays

Garage Door Opener Receivers

Garage Door Opener Receivers

Wire to automatic overhead door openers to accept signals from remote and keypad transmitters

Garage Door Opener Transmitters

Garage Door Opener Transmitters

Send signals to receivers to open and close automatic overhead door openers

Push-to-Close Latches

Push-to-Close Latches

Automatically hold doors shut when you push them closed

Cam Latches

Secure drawers, cabinets, mailboxes, and other enclosures

Fabricating and Machining

3D Printer Probes

3D Printer Probes

Map the ups and downs of print surfaces so printers extrude at the proper height

3D Printer Extruder Heating Elements

3D Printer Extruder Heating Elements

Replace your entire heating element, or switch it out to print at higher speeds or temperatures

Temperature Sensors for 3D Printer Extruder Heating Elements

Temperature Sensors for 3D Printer Extruder Heating Elements

Measure heating block temperature and send it to printer controllers

Heating, Ventilation, and Air Conditioning

HVAC Flame Detectors

HVAC Flame Detectors

Replace flame detectors in HVAC equipment such as furnaces, ovens, water heaters, and boilers

HVAC Switches

Control and monitor airflow in HVAC systems automatically

Thermostats

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

Fans

Blow and direct air to keep spaces and equipment cool and ventilated

Exhaust Fans

Draw stagnant and humid air out of a room or area

Air Filters

Trap dust and debris in HVAC, exhaust, and electronics systems to improve efficiency and air quality

Communication

Audible Alarms

Everything from bells and whistles to horns and sirens

Traffic Lights

Signal and direct traffic

Labels

Stick onto items to identify or convey information about them

Fastening and Joining

Screwdriver/Nutdrivers

Screwdriver/Nutdrivers

Quickly switch between driving screws and driving nuts

Screwdrivers

Tighten and loosen screws

Socket Adapters

Socket Adapters

Make your socket more versatile, from converting the drive to limiting torque

Torque Wrenches

Torque Wrenches

Avoid overtightening and damaging fasteners by applying a specific torque

Power Transmission

Air Cylinders

Push and pull loads to do everything from stamping materials to sorting parts on conveyors

Hydraulic Cylinders

Hydraulic Cylinders

Push and pull heavy loads to operate forklifts, compactors, and other machinery

Stopper Cylinders

Stopper Cylinders

Extend to stop loads on a conveyor and retract to let them pass

Parts Metering Cylinders

Parts Metering Cylinders

Space out parts to control flow on conveyors and feeders

Lubricating

Grease Dispenser Monitors

Grease Dispenser Monitors

Extend the life of bearings by taking the guesswork out of how much to lubricate them

Facility and Grounds Maintenance

Metal Detectors

Metal Detectors

Locate metal underground; screen people for concealed metal objects

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)