Chapter 6

The light source used in most industrial photoelectric sensors is a

LED

An inductive proximity sensor is actuated by

a metal object

The most common actuated for a reed switch is

a permanent or electromagnet

The electromagnetic latching relay

all

capacitor proximity sensors

are actuated by both conductive an non-conductive materials

Fiber optic sensors

are not affected by electrical interference, carry light signals, use a flexible cable containing tiny fibers

A limit switch is usually actuated by..

contact with an object

An encoder is used to

convert motion into a digital signal

An actuator is a device that

converts an electrical signal into mechanical movement

Bar code scanners are used primarily for

data collection

An electromagnet control relay is basically a(n)

electromagnet used to switch contacts

A contactor:

is designed to handle heavy power loads

solenoid valves are available to control

oil flow, air flow, water flow

All servo motors

operate in the closed-loop mode

A thermocoulpe, when heated

produces a small DC votlage

The force applied to a strian gauge causes it to bend and change its

resistance

A tachometer normally refers to a____ used for speed measurements

small generator

A(n) ________ converts light energy directly into electric energy

solar cell

A_____ converts electrical puleses applied to it into discrete rotor

stepper motor

The abbreviations NO (normally open) and NC (normally closed) represent the electrical state of switch contacts when:

the switch is actuated

A_____ operates by sending waves toward a target and measuring the time it takes for the pulses to bounce back

ultrasonic sensor

Most proximity switches come equipped with an LED status indicator to:

verify the output switching action

A proximity switch can be actuated

without any physical contact